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Instability of Saturated Soilunder Axial Load 被引量:1
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作者 LU Xiao bing YANG Zhen sheng ZHANG Jia hua (Institute of Mechanics, Chinese Academy of Sciences) 《Advances in Manufacturing》 SCIE CAS 1999年第4期270-273,共4页
A theoretical description of instability of saturated soil under axial load is presented with a set of equations describing the deformation based on the two phase continuous media theory. It is shown that all parame... A theoretical description of instability of saturated soil under axial load is presented with a set of equations describing the deformation based on the two phase continuous media theory. It is shown that all parameters of water and soil influence the instability and two types of instability may exist. One of them is dominated by pore pressure softening, while the other by strain softening. Finally, a practical application is discussed. 展开更多
关键词 saturated soil axial load instability perturbation method
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Deformation properties of chloride saline soil under action of a low-temperature environment and different loads 被引量:4
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作者 Yu Zhang Jian Kun Liu +1 位作者 Jian Hong Fang An Hua Xu 《Research in Cold and Arid Regions》 CSCD 2017年第3期307-311,共5页
To find the deformation properties of chloride saline soil under the influence of a low temperature environment and different loads,two types of chloride saline soil were selected and their deformation process was tes... To find the deformation properties of chloride saline soil under the influence of a low temperature environment and different loads,two types of chloride saline soil were selected and their deformation process was tested in the laboratory and analyzed during the cooling process in the sensitive cryogenic temperature range.The research results show that high-chloride-salt saline soil underwent little volume change under the no-load condition during the cooling process.Under staticload and dynamic-load conditions,different degrees of settlement deformation occurred;throughout the entire cooling process,another chloride saline soil with a high proportion of sulfate salt underwent volume expansion under no-load and static-load conditions.Under the no-load condition,a certain degree of settlement deformation occurred.Deformation properties were evaluated at different time points during the cooling process for two kinds of chloride saline soil.Finally,deformation characteristics of chloride saline soil were analyzed from the perspective of salt type and crystallization variation under the action of a low-temperature environment and different loads. 展开更多
关键词 SALINE soil low temperature loads DEFORMATION COOLING process
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Effects of sediment load on the abrasion of soil aggregate and hydraulic parameters in experimental overland flow 被引量:3
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作者 WANG Jun-guang YU Bing +2 位作者 NI Shi-min GUO Zhong-lu CAI Chong-fa 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2020年第4期1117-1126,共10页
The breakdown of soil aggregates under rainfall and their abrasion in overland flow are important processes in water erosion due to the production of more fine and transportable particles and,the subsequent significan... The breakdown of soil aggregates under rainfall and their abrasion in overland flow are important processes in water erosion due to the production of more fine and transportable particles and,the subsequent significant effect on the erosion intensity.Currently,little is known about the effects of sediment load on the soil aggregate abrasion and the relationship of this abrasion with some related hydraulic parameters.Here,the potential effects of sediment load on soil aggregate abrasion and hydraulic parameters in overland flow were investigated through a series of experiments in a 3.8-m-long hydraulic flume at the slope gradients of 8.7 and 26.8%,unit flow discharges from 2×10^-3 to 6×10^-3 m^2 s^-1,and the sediment concentration from 0 to 110 kg m-3.All the aggregates from Ultisols developed Quaternary red clay,Central China.The results indicated that discharge had the most significant(P<0.01)effect on the aggregates abrasion with the contributions of 58.76 and 60.34%,followed by sediment feed rate,with contributions of 39.66 and 34.12%at the slope gradients of 8.7 and 26.8%,respectively.The abrasion degree of aggregates was found to increase as a power function of the sediment concentration.Meanwhile,the flow depth,friction factor,and shear stress increased as a power function along with the increase of sediment concentration at different slope gradients and discharges.Reynolds number was obviously affected by sediment concentration and it decreased as sediment concentration increased.The ratio of the residual weight to the initial weight of soil aggregates(Wr/Wi)was found to increase as the linear function with an increasing flow depth(P=0.008)or Reynolds number(P=0.002)in the sediment-laden flow.The Wr/Wi values followed a power function decrease with increasing friction factor or shear stress in the sediment-laden flow,indicating that friction factor is the best hydraulic parameter for prediction of soil aggregate abrasion under different sediment load conditions.The information regarding the soil aggregate abrasion under various sediment load conditions can facilitate soil process-based erosion modeling. 展开更多
关键词 soil AGGREGATE SEDIMENT load HYDRAULIC parameters overland flow
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SOIL PILE INTERACTION UNDER STATIC, DYNAMIC AND CYCLIC LATERAL LOADS AND A PROPOSAL OF p-y CURVE FORMULA 被引量:1
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作者 Gao, Ming Chen, Jinzhen +1 位作者 Zhen, Guofang Fang, Huolang 《China Ocean Engineering》 SCIE EI 1989年第3期259-270,共12页
In this paper, the studies on soil-pile interaction behaviors in saturated sands under static, dynamic and cyclic lateral loads by model testing are described. By comparing with the field test results for piles in sof... In this paper, the studies on soil-pile interaction behaviors in saturated sands under static, dynamic and cyclic lateral loads by model testing are described. By comparing with the field test results for piles in soft sandy clay, a formula of p-y curves based on constitutive relationship of soils applicable for both sandy and soft clays is proposed. Good agreements are obtained in comparison with the field test results performed by other investigators abroad. A p-y hysteresis curve formula based on the modified Masing's doubling criterion is also proposed, and the results are in satisfactory agreement with field test results. 展开更多
关键词 FOUNDATIONS soil Structure Interaction Mathematical Models PILES loading soilS Structural Analysis Dynamic Response
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Analysis of nonlinear settlement for an unsaturated soil under stage continuous loading 被引量:1
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作者 陈伟志 蒋关鲁 +2 位作者 赵慧爽 吴丽君 李安洪 《Journal of Central South University》 SCIE EI CAS 2014年第12期4690-4697,共8页
A new approach was proposed to describe settlement behavior of an unsaturated soil with subgrade filling for high-speed railway. Firstly, based on Terzaghi consolidation theory, equations considering the variation coe... A new approach was proposed to describe settlement behavior of an unsaturated soil with subgrade filling for high-speed railway. Firstly, based on Terzaghi consolidation theory, equations considering the variation coefficient of consolidation with void ratio and saturation for consolidation of an unsaturated soil under stage continuous loading were derived, and according to analytical solutions of equations, a formula for settlement computation under stage continuous loading was obtained. Then, combined with the width-to-height ratio of subgrade to compute ground reaction, and by means of in-situ plate loading curves, a correctional approach was presented for the analysis of nonlinear settlement of foundation. Also, the comparison between calculated and measured loadsettlement behavior for an unsaturated soil in Qingdao-Ji'nan high-speed railway was given to demonstrate the effectiveness and accuracy of the proposed approach. It can be noted that the presented solution can be used to predict the settlement of an unsaturated soil foundation under stage continuous loading in engineering design. 展开更多
关键词 settlement unsaturated soil consolidation stage continuous loading high-speed railway
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Dynamic analysis of slab track on multi-layered transversely isotropic saturated soils subjected to train loads 被引量:5
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作者 Zhan Yongxiang Yao Hailin +1 位作者 Lu Zheng Yu Dongming 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2014年第4期731-740,共10页
The dynamic responses of a slab track on transversely isotropic saturated soils subjected to moving train loads are investigated by a semi-analytical approach. The track model is described as an upper Euler beam to si... The dynamic responses of a slab track on transversely isotropic saturated soils subjected to moving train loads are investigated by a semi-analytical approach. The track model is described as an upper Euler beam to simulate the rails and a lower Euler beam to model the slab. Rail pads between the rails and slab are represented by a continuous layer of springs and dashpots. A series of point loads are formulated to describe the moving train loads. The governing equations of track-ground systems are solved using the double Fourier transform, and the dynamic responses in the time domain are obtained by the inverse Fourier transform. The results show that a train load with high velocity will generate a larger response in transversely isotropic saturated soil than the lower velocity load, and special attention should be paid on the pore pressure in the vicinity of the ground surface. The anisotropic parameters of a surface soil layer will have greater influence on the displacement and excess pore water pressure than those of the subsoil layer. The traditional design method taking ground soil as homogeneous isotropic soil is unsafe for the case of RE 〈 1 and RG 〈 1, so a transversely isotropic foundation model is of great significance to the design for high train velocities. 展开更多
关键词 slab track transversely isotropic saturated soil Biot's theory train load dynamic response
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Study on the subgrade deformation under high-speed train loading and water–soil interaction
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作者 Jian Han Guo-Tang Zhao +1 位作者 Xiao-Zhen Sheng Xue-Song Jin 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2016年第2期233-243,共11页
It is important to study the subgrade characteristics of high-speed railways in consideration of the water–soil coupling dynamic problem,especially when high-speed trains operate in rainy regions.This study develops ... It is important to study the subgrade characteristics of high-speed railways in consideration of the water–soil coupling dynamic problem,especially when high-speed trains operate in rainy regions.This study develops a nonlinear water–soil interaction dynamic model of slab track coupling with subgrade under high-speed train loading based on vehicle–track coupling dynamics.By using this model,the basic dynamic characteristics,including water–soil interaction and without water induced by the high-speed train loading,are studied.The main factors-the permeability coefficien and the porosity-influencin the subgrade deformation are investigated.The developed model can characterize the soil dynamic behaviour more realistically,especially when considering the influenc of water-rich soil. 展开更多
关键词 Water–soil interaction High-speed train loading Finite difference method Subgrade deformation Permeability coefficien Porosity
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ONE-DIMENSIONAL CONSOLIDATION OF LAYERED AND VISCO-ELASTIC SOILS UNDER ARBITRARY LOADING 被引量:1
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作者 蔡袁强 徐长节 袁海明 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2001年第3期353-360,共8页
Based on the layered visco-elastic soil model, according to the Terzaghi's one dimensional consolidation theory, by the method of Laplace transform and matrix transfer technique, the problems about the consolidati... Based on the layered visco-elastic soil model, according to the Terzaghi's one dimensional consolidation theory, by the method of Laplace transform and matrix transfer technique, the problems about the consolidation of layered and saturated visco-elastic soils under arbitrary loading were solved. Through deductions, the general solution, in the terms of layer thickness, the modulus and the coefficients of permeability and Laplacian transform's parameters was obtained. The strain and deformation of the layered and saturated visco-elastic soils under arbitrary loading can be calculated by Laplace inversion. According to the results of several numerical examples, the consolidation of visco-elastic soils logs behind that of elastic soils. The development of effective stress and the displacement is vibrant process under cyclic loading. Finally, an engineering case is studied and the results prove that the methods are very effective. 展开更多
关键词 arbitrary loading LAYERED visco-elastic soils one-dimensional consolidation
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Study on temperature field and settlement of thawing soil under static and dynamic loading
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作者 LiYun Peng JianKun Liu 《Research in Cold and Arid Regions》 CSCD 2013年第5期659-666,共8页
A series of tests were conducted to analyze temperature field distribution and thawing settlement of a thawing soil under static and dynamic loading at various cooling and thawing temperatures. The results demonstrate... A series of tests were conducted to analyze temperature field distribution and thawing settlement of a thawing soil under static and dynamic loading at various cooling and thawing temperatures. The results demonstrate: (1) the temperature field distribution of the thawing soil was not significantly influenced by the loading form under the tested loading conditions; similar results were obtained for samples at different dynamic loading frequencies and different dynamic loading ampli- tudes, which verified the independence of loading form and temperature field; (2) changed temperature field distributions were found in thawing soil with different cooling and thawing temperatures, and the cooling and thawing temperature of the samples were the main factors affecting their temperature distributions; (3) under the tested conditions, thawing set- tlements were little influenced by the thawing temperature and the dynamic loading frequency; and (4) a linear relation- ship existed between the thawing settlement and the cooling temperature, and a logarithmic function could be used to describe the relationship between the thawing settlement and the loading amplitude. 展开更多
关键词 temperature field thawing settlement thawing soil dynamic loading cooling temperature thawing temperature
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Experimental study on DX pile performance in frozen soils under lateral loading
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作者 XiaoBing Liu LiHong Chen +2 位作者 ZhongYang Yu JianXiao Hu Wen Peng 《Research in Cold and Arid Regions》 CSCD 2013年第5期608-613,共6页
Experiments about working mechanism and mechanical characteristics of the DX model pile foundation under lateral dynamic and static loading were conducted by using a model system of the dynamic frozen soil-pile intera... Experiments about working mechanism and mechanical characteristics of the DX model pile foundation under lateral dynamic and static loading were conducted by using a model system of the dynamic frozen soil-pile interaction. The horizontal displacement-force relationship of the pile head and bending moment distribution along the body in frozen soils of different temperatures were discussed. According to test results, both the horizontal disp!acement-force relationship of the DX pile head and bending moment distribution of the DX pile body are smaller than that of equal-diameter piles under same lateral loads. The piles with different plate positions show different displacements and bending moments. This phenomenon is mainly related to the soil temperature and bearing plates locations. Thus, dynamic response analysis of the pile foundation should be taken into account. 展开更多
关键词 DX pile frozen soils lateral static load lateral dynamic load model test
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Flexural Behavior of Laterally Loaded Tapered Piles in Cohesive Soils
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作者 Musab Aied Qissab 《Open Journal of Civil Engineering》 2015年第1期29-38,共10页
In this paper, the flexural behavior of laterally loaded tapered piles in cohesive soils is investigated. The exact solution for the governing differential equation of the problem is obtained based on the beam-on-elas... In this paper, the flexural behavior of laterally loaded tapered piles in cohesive soils is investigated. The exact solution for the governing differential equation of the problem is obtained based on the beam-on-elastic foundation approach in which the soil reaction on the pile is related directly to the pile lateral deflection. In this investigation, the modulus of subgrade reactions is assumed to be constant along the pile depth. Parametric study through numerical examples is carried out to prove the validity and accuracy of the obtained results. In general, the derived displacement field can be used to study pile response in multilayered soil profiles by subdividing the pile into a number of elements. It is found that tapered piles show stiffer behavior than that for prismatic ones having the same material volume with an optimum stress distribution along the pile depth. Accordingly, tapered piles are more efficient and economic than those having the same material volume. Verification is also carried out for the obtained results through finite element analysis and the selected number of elements gives a very good agreement for lateral deflection and a larger number of elements is required to obtain better results for bending moment because of moment loss resulting from the lack of shear diagram. 展开更多
关键词 COHESIVE soilS FLEXURAL Behavior LATERAL load SUBGRADE Reaction Tapered PILES
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A semi-empirical formula for evaluating residual strain of soils under earthquake loading
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作者 袁晓铭 孟上九 孙锐 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2003年第2期307-313,共7页
A new semi-empirical formula for evaluating the residual strain of soils under earthquake loading is presented in this paper based on the incremental method and the increment model proposed by the authors.When the inc... A new semi-empirical formula for evaluating the residual strain of soils under earthquake loading is presented in this paper based on the incremental method and the increment model proposed by the authors.When the incident loading is uniform,the results calculated by the new formula are nearly the same as those by the existing formula.For excitation of the random earthquake loading,the results calculated by the new formula are compared to the results obtained by dynamic triaxial tests.The dynamic triaxial tests had been performed considering different seismic waves,confining stresses, consolidation ratios,and types of cohesive soils.The comparison between the calculated and tested results indicate that the presented formula can efficiently and practically describe the time-dependent process of the soil residual strains under actual seismic loads. 展开更多
关键词 soil residual strain semi-empirical formula carthquake loading
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桩顶荷载及温度循环对黄土地基中能量桩承载性状影响研究
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作者 曹卫平 张作鹏 +2 位作者 赵敏 李清源 何展朋 《中国安全生产科学技术》 CAS CSCD 北大核心 2024年第8期165-172,共8页
为对比分析未经过温度循环的普通桩与能量桩竖向承载变形性状,开展黄土地基中能量桩温度循环试验。模型桩为现浇钢筋混凝土灌注桩,黄土为人工配制重塑黄土。研究结果表明:温度循环弱化黄土地基中能量桩桩身侧阻、增强能量桩桩底端阻,温... 为对比分析未经过温度循环的普通桩与能量桩竖向承载变形性状,开展黄土地基中能量桩温度循环试验。模型桩为现浇钢筋混凝土灌注桩,黄土为人工配制重塑黄土。研究结果表明:温度循环弱化黄土地基中能量桩桩身侧阻、增强能量桩桩底端阻,温度循环过程中桩顶工作荷载越大,桩侧阻的弱化作用及桩端阻的增强作用越大,这导致能量桩的竖向抗压承载力比普通桩有明显的提高。另外,根据模型试验结果,通过数据拟合建立桩土界面摩阻力-桩土相对位移及桩端土反力-桩端沉降双曲线函数模型,并确定模型参数,其函数计算结果与试验结果对比表明本文模型能合理反映温度循环及桩顶工作荷载大小对桩基承载力的影响。研究结果可为黄土地区能量桩的安全设计提供一定参考。 展开更多
关键词 能量桩 黄土 模型试验 温度循环 桩土荷载传递函数
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Dynamic properties and liquefaction behaviour of cohesive soil in northeast India under staged cyclic loading 被引量:2
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作者 Shiv Shankar Kumar A.Murali Krishna Arindam Dey 《Journal of Rock Mechanics and Geotechnical Engineering》 CSCD 2018年第5期958-967,共10页
Estimation of strain-dependent dynamic soil properties, e.g. the shear modulus and damping ratio, along with the liquefaction potential parameters, is extremely important for the assessment and analysis of almost all ... Estimation of strain-dependent dynamic soil properties, e.g. the shear modulus and damping ratio, along with the liquefaction potential parameters, is extremely important for the assessment and analysis of almost all geotechnical problems involving dynamic loading. This paper presents the dynamic properties and liquefaction behaviour of cohesive soil subjected to staged cyclic loading, which may be caused by main shocks of earthquakes preceded or followed by minor foreshocks or aftershocks, respectively. Cyclic triaxial tests were conducted on the specimens prepared at different dry densities (1.5 g/cm3 and 1.75 g/cm3) and different water contents ranging from 8% to 25%. The results indicated that the shear modulus reduction (G/Gmax) and damping ratio of the specimen remain unaffected due to the changes in the initial dry density and water content. Damping ratio is significantly affected by confining pressure, whereas G/Gmax is affected marginally. It was seen that the liquefaction criterion of cohesive soils based on single-amplitude shear strain (3.75% or the strain at which excess pore water pressure ratio becomes equal to 1, whichever is lower) depends on the initial state of soils and applied stresses. The dynamic model of the regional soil, obtained as an outcome of the cyclic triaxial tests, can be successfully used for ground response analysis of the region. 展开更多
关键词 Cohesive soil Dynamic soil properties Liquefaction potential Cyclic triaxial tests Staged cyclic loading
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列车荷载作用下压实花岗岩残积土累积变形特性试验研究
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作者 尹松 刘鹏飞 +3 位作者 孙玉周 李新明 闫盼 王志留 《振动与冲击》 EI CSCD 北大核心 2024年第4期87-95,共9页
为研究列车荷载作用下应力及湿化条件对压实花岗岩残积土累积变形特性的影响,以围压、动应力幅值、含水率为变量,对压实花岗岩残积土进行循环空心扭剪和循环定向加载试验。结果表明:循环扭剪应力路径下主应力轴旋转效应增加了试样的累... 为研究列车荷载作用下应力及湿化条件对压实花岗岩残积土累积变形特性的影响,以围压、动应力幅值、含水率为变量,对压实花岗岩残积土进行循环空心扭剪和循环定向加载试验。结果表明:循环扭剪应力路径下主应力轴旋转效应增加了试样的累积变形量,甚至改变了累积变形的发展模式,该影响程度随试样含水率的增大而增大;试样的累积应变发展速率在加载初期(N<100)时完成大幅度衰减,围压增大可加快累积应变发展速率的衰减,动应力幅值的增加会延长累积应变发展速率的衰减时间,循环扭剪加载时试样的累积应变发展速率衰减程度小于循环定向加载试验,含水率越高该效应越显著。通过预测模型能够对两种动力加载应力路径下的稳定型和发展型累积应变发展曲线能够进行拟合,对压实花岗岩残积土的累积变形作出较好预测。 展开更多
关键词 花岗岩残积土 循环加载 空心圆柱剪切仪 应力路径 主应力轴旋转 累积变形预测
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冲击荷载下含夹层饱和砂土孔压变化规律分析
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作者 金丹丹 鲁先东 +2 位作者 王炳辉 施展 张雷 《岩土力学》 EI CAS CSCD 北大核心 2024年第4期1081-1091,1120,共12页
砂土中夹层的性状会影响饱和砂土孔压发展,从而影响砂土层变形。为研究夹层位置、厚度和种类等不同夹层状态下砂土液化过程中的孔压变化规律,设计了冲击荷载作用下层状砂液化试验,建立了含夹层饱和砂土理论模型,并将试验结果与理论分析... 砂土中夹层的性状会影响饱和砂土孔压发展,从而影响砂土层变形。为研究夹层位置、厚度和种类等不同夹层状态下砂土液化过程中的孔压变化规律,设计了冲击荷载作用下层状砂液化试验,建立了含夹层饱和砂土理论模型,并将试验结果与理论分析进行对比。结果表明:含夹层饱和砂土的孔压发展呈现3个阶段,即快速上升、快速消散、缓慢消散阶段。高渗透性夹层高度越高,其下方土层孔压快速消散时长越短,越快趋于稳定值,但消散总时长无明显影响;低渗透性夹层高度或厚度的增大,均会使夹层上方孔压快速消散阶段速率加快,孔压消散稳定阶段延长,孔压消散总时长随之线性增长;同时,孔隙水会在低渗透性夹层下方形成水膜,夹层高度或厚度的增加均会使水膜持续时间增长,但水膜形态主要受夹层厚度影响。试验结果与理论分析较为一致,说明了试验的可靠性。 展开更多
关键词 层状砂土 冲击荷载 超孔隙水压力 夹层高度 夹层厚度 水膜
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海陆交互相软土固结抗剪强度指标变化规律研究
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作者 刘红军 何程铃 +2 位作者 陈锋 周志军 杨超 《森林工程》 北大核心 2024年第4期218-224,共7页
以珠三角地区海陆交互相淤泥质软土为研究对象,通过室内直剪试验探究不同固结压力和固结度下抗剪强度及抗剪强度指标的变化规律,提出抗剪强度及对应指标-固结度-固结压力三维Logistic数学模型。研究结果表明,当固结压力P≥200 kPa、固结... 以珠三角地区海陆交互相淤泥质软土为研究对象,通过室内直剪试验探究不同固结压力和固结度下抗剪强度及抗剪强度指标的变化规律,提出抗剪强度及对应指标-固结度-固结压力三维Logistic数学模型。研究结果表明,当固结压力P≥200 kPa、固结度U≥40%时,软土黏聚力(c)和内摩擦角(φ)增长较为明显;当U=100%时,各级固结压力作用下的软土抗剪强度(τ)相较于初始状态分别提高了7.89、12.73、13.50、18.20、22.38 kPa;所给出的三维数学模型可直接计算出某一固结压力和固结度下的抗剪强度指标c、φ、τ。研究成果能够更为准确地评价该地区软土地基逐级加载过程中的整体稳定性。 展开更多
关键词 海陆交互相软土 分级加载 抗剪强度指标 固结度 固结压力
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软土中单侧边载作用下桩基负摩阻力研究
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作者 谷复光 吴天成 《吉林建筑大学学报》 CAS 2024年第1期56-60,共5页
软土中因土体压缩性较高,在边载状况下易产生桩基负摩阻力,从而对工程产生安全隐患。本文通过有限元法对软土中受边载作用的桩基础所受到的桩基负摩阻力进行数值模拟,分析了不同边载等级、不同边载位距对软土中桩基负摩阻力、中性点位... 软土中因土体压缩性较高,在边载状况下易产生桩基负摩阻力,从而对工程产生安全隐患。本文通过有限元法对软土中受边载作用的桩基础所受到的桩基负摩阻力进行数值模拟,分析了不同边载等级、不同边载位距对软土中桩基负摩阻力、中性点位置和桩身轴力的影响。结果表明,在边载等级增加时,软土中桩身轴力有明显上升趋势,并随桩体埋深增加呈非线性趋势增长,而桩基负摩阻力随深度变化呈现非线性减小的趋势,桩体的下拉力增加,边载效应增强;同等级边载效应时,当边载与桩基之间的距离增加时,软土中桩基负摩阻力逐渐减小,中性点位置位于桩体靠近底部位置处,并随边载位置改变而受到一定影响。 展开更多
关键词 软土 边载效应 桩基负摩阻力 桩身轴力
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活动门试验中土压力盒标定方法
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作者 李尧 董星 +2 位作者 杜旭超 郭张龙 陈厚先 《科学技术与工程》 北大核心 2024年第23期10008-10014,共7页
为确保活动门试验结果的准确性,根据试验填土深度的不同,对一批相同型号的电阻式土压力盒进行了垂直方向上的分级加载和卸载标定,并考虑标定装置内壁摩擦力影响,修正了作用在土压力盒上的有效加载和卸载应力。通过对加卸载过程进行离散... 为确保活动门试验结果的准确性,根据试验填土深度的不同,对一批相同型号的电阻式土压力盒进行了垂直方向上的分级加载和卸载标定,并考虑标定装置内壁摩擦力影响,修正了作用在土压力盒上的有效加载和卸载应力。通过对加卸载过程进行离散元模拟,证明有效加载和卸应力修正方法较为合理。标定试验结果表明,加载过程中微应变量-有效应力曲线呈线性变化,可使用线性函数拟合;卸载过程中微应变量-有效应力曲线存在明显的滞后现象,且滞后程度随有效加载应力的增大而增大,可使用单指数曲线拟合。标定土压力盒后,开展了填土试验,结果表明土压力盒不宜在压力过小或填土深度过小时使用。 展开更多
关键词 土木工程 土压力盒 加载标定 卸载标定 离散元模拟 活动门试验
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地下室顶板车行荷载简化计算及补强方法探索
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作者 杨巧红 王永亮 《工程质量》 2024年第7期89-93,共5页
通过调查分析施工荷载特性和地下室顶板极限承载力影响因素,利用荷载规范研究结论,简化地下室顶板车行荷载对顶板结构受力影响的计算方法,并以兰州市某高校公寓楼地下室顶板为研究对象进行实体验证。在顶板荷载设计基础上,通过顶板增加... 通过调查分析施工荷载特性和地下室顶板极限承载力影响因素,利用荷载规范研究结论,简化地下室顶板车行荷载对顶板结构受力影响的计算方法,并以兰州市某高校公寓楼地下室顶板为研究对象进行实体验证。在顶板荷载设计基础上,通过顶板增加覆土、利用地下室顶板未拆除的钢管架支撑等措施,作为施工临时道路,可满足施工阶段施工车辆满载行车需要。在此基础上,综合分析评估了地下室顶板采取覆土及加固措施可行性及注意事项,为其它工程的后期建设施工提供了合理的计算方法和评估依据。 展开更多
关键词 地下室顶板 荷载 覆土 碗扣式钢管脚手架
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