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流变性土排桩地基的禁振带隙
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作者 杨华中 赵建昌 +1 位作者 余云燕 王立安 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2023年第7期1410-1417,共8页
基于时间依赖性模量推导流变性土的动阻尼表达式,构建桩-土周期结构的连续介质模型,利用多重散射法计算桩-土周期系统的能带结构和带隙.通过算例分析,分析流变性土排桩地基中剪切波的带隙特征及参数影响.结果表明,流变性土的阻尼比随频... 基于时间依赖性模量推导流变性土的动阻尼表达式,构建桩-土周期结构的连续介质模型,利用多重散射法计算桩-土周期系统的能带结构和带隙.通过算例分析,分析流变性土排桩地基中剪切波的带隙特征及参数影响.结果表明,流变性土的阻尼比随频率发生非单调性变化,初始和最终状态的模量比决定阻尼比的幅值,而松弛时间决定阻尼比随频率的变化速率.土体的流变性导致实际工程中排桩地基的带隙频率高于理论值,且带宽减小,减弱了排桩的隔振效果,消除桩周土的流变性将有利于排桩发挥隔振作用. 展开更多
关键词 流变性土 排桩 周期结构 多重散射法 禁振带隙
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流变性软土蠕变特性研究进展 被引量:1
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作者 曹晖 钟辉虹 张亦静 《株洲工学院学报》 2004年第2期102-106,共5页
针对软土的应力-应变-时间响应,从蠕变经验公式、流变元件模型以及弹粘塑性模型理论三个方面总结了流变性软土蠕变特性研究历史和最新进展。
关键词 流变性 蠕变 弹粘塑性 滞后塑性应变 内蕴时间变量屈服面
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软土流变性对高速公路路基变形的影响分析 被引量:3
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作者 余孟 黄显全 《广西交通科技》 2003年第5期63-65,共3页
在对软粘土变形特性进行分析和在已有的粘弹塑性本构模型的基础上,结合高速公路工程进行了较多的室内三轴排水剪、三轴流变试验,通过试验确定了软土粘弹塑本结构模型的参数,将为本构模型引入BOIT固结理论有限元分析程序,对影响路基稳定... 在对软粘土变形特性进行分析和在已有的粘弹塑性本构模型的基础上,结合高速公路工程进行了较多的室内三轴排水剪、三轴流变试验,通过试验确定了软土粘弹塑本结构模型的参数,将为本构模型引入BOIT固结理论有限元分析程序,对影响路基稳定的沉降、侧向位移、工后沉降及土体稳定进行了分析,并对实测的资料进行分析比较,从而阐明了软粘土地基进行变形分析时考虑土体流变性的必要性。 展开更多
关键词 高速公路 路基变形 流变性 粘弹塑本结构模型 有限元
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考虑流变与固结效应的桩筏基础-地基共同作用分析 被引量:8
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作者 栾茂田 崔春义 杨庆 《岩土力学》 EI CAS CSCD 北大核心 2008年第2期289-295,共7页
土的流变性与地基固结的综合作用,导致了上部结构与地基变形的时效性,并呈现出明显的非线性,对桩筏基础与地基共同作用的工作机理及其工作性能产生重要影响。为此,采用弹黏塑性流变模型考虑土的流变特性,通过有限元方法数值求解Biot耦... 土的流变性与地基固结的综合作用,导致了上部结构与地基变形的时效性,并呈现出明显的非线性,对桩筏基础与地基共同作用的工作机理及其工作性能产生重要影响。为此,采用弹黏塑性流变模型考虑土的流变特性,通过有限元方法数值求解Biot耦合固结方程,对桩筏基础与地基共同作用的时间效应问题进行了非线性数值分析。通过算例计算,对加载后桩筏基础荷载分配和沉降特性及下覆土层中孔隙水压力的扩散和消散规律进行了探讨。研究表明,地基孔隙水压力的增长和消散不仅具有Mandel-Cryer效应,而且依赖于土的流变变形,尤其在排水条件较差时更为明显。因此,在分析桩筏基础内力变形的时效性时必须考虑土的流变性与地基的固结作用的联合效应。 展开更多
关键词 桩筏基础 时效性 流变性 地基的固结 有限元法
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Solution of a rigid disk on saturated soil considering consolidation and rheology
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作者 高绍武 王建华 周香莲 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第3期222-228,共7页
The problem of a rigid disk acting with normal force on saturated soil was studied using Biot consolidation theory and integral equation method and the Merchant model to describe the saturated soil rheology. Using int... The problem of a rigid disk acting with normal force on saturated soil was studied using Biot consolidation theory and integral equation method and the Merchant model to describe the saturated soil rheology. Using integral transform techniques, general solutions of Biot consolidation functions and the dual integral equations of a rigid disk on saturated soil were established based on the boundary conditions. These equations can be simplified using Laplace-Hankel and Abel transform methods. The numerical solutions of the integral equations, and the corresponding inversion transform were used to obtain the settlement and contact stresses of the rigid disk. Numerical examples showed that the soil settlement is small if only consolidation is considered, so the soil rheology must be taken into account to calculate the soil settlement. Numerical solution of Hankel inverse transform is also given in this paper. 展开更多
关键词 Saturated soil Rigid disk Biot consolidation theory Hankel transform RHEOLOGY
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Spatial Variability of Soil Organic Carbon in a Watershed on the Loess Plateau 被引量:37
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作者 WANG Yun-Qiang ZHANG Xing-Chang +1 位作者 ZHANG Jing-Li LI Shun-Ji 《Pedosphere》 SCIE CAS CSCD 2009年第4期486-495,共10页
Soil organic carbon (SOC) has great impacts on global warming, land degradation and food security. Classic statistical and geostatistical methods were used to characterize and compare the spatial heterogeneity of SOC ... Soil organic carbon (SOC) has great impacts on global warming, land degradation and food security. Classic statistical and geostatistical methods were used to characterize and compare the spatial heterogeneity of SOC and related factors, such as topography, soil type and land use, in the Liudaogou watershed on the Loess Plateau of North China. SOC concentrations followed a log-normal distribution with an arithmetic and geometric means of 23.4 and 21.3 g kg-1, respectively, were moderately variable (CV = 75.9%), and demonstrated a moderate spatial dependence according to the nugget ratio (34.7%). The experimental variogram of SOC was best-fitted by a spherical model, after the spatial outliers had been detected and subsequently eliminated. Lower SOC concentrations were associated with higher elevations. Warp soils and farmland had the highest SOC concentrations, while aeolian sand soil and shrublands had the lowest SOC values. The geostatistical characteristics of SOC for the different soil and land use types were different. These patterns were closely related to the spatial structure of topography, and soil and land use types. 展开更多
关键词 GEOSTATISTICS land use soil type spatial pattern TOPOGRAPHY
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Rheological Properties of Recycled Aggregate Concrete Using Superplasticizers
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作者 Sandrine Braymand Pierre Francois +1 位作者 Francoise Feugeas Christophe Fond 《Journal of Civil Engineering and Architecture》 2015年第5期591-597,共7页
The mechanical properties of recycled aggregates concrete from demolition have been studied for several years. It has been documented that rheological properties of these concrete are generally affected by use of recy... The mechanical properties of recycled aggregates concrete from demolition have been studied for several years. It has been documented that rheological properties of these concrete are generally affected by use of recycled aggregates. They could present mechanical properties less affected by the presence of recycled aggregates if the initial concrete were of good quality. However, manufacturing problems, mainly attributed to the angular character of these aggregates and to the granulometry of recycled sand, limit their industrial use. The worth point of this study consists in the optimization of the concrete formulation using specific admixture, adapted to this aggregates in order to facilitate its manufacturing. It shows that the new generation of superplasticizers containing some copolymer polycarboxylate makes it possible to significantly improve the fluidity of the recycled aggregates concrete in its fresh state. The aim of this research is to control rheologica] properties of fresh recycled aggregates concrete with fine and coarse recycled aggregates to limit the negative influence of aggregates on mechanical properties of concrete. 展开更多
关键词 SUPERPLASTICIZER recycled aggregate concrete WORKABILITY VISCOSITY mechanical strength grading.
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