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Centrifuge tests for seismic response of single pile foundation supported wind turbines in sand influenced by earthquake history 被引量:2
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作者 Wang Yubing Zhang Zhongchang +1 位作者 Wu Xiaofeng Zhu Bin 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2023年第3期623-636,共14页
This paper reports on two sets of centrifuge model tests of wind turbines in dry sand and saturated sand subjected to earthquake sequences.The wind turbine system is composed of a single pile foundation and a wind tur... This paper reports on two sets of centrifuge model tests of wind turbines in dry sand and saturated sand subjected to earthquake sequences.The wind turbine system is composed of a single pile foundation and a wind turbine.All tests were applied with liquefaction experiments and analysis projects(LEAP)waves to simplify the analysis.The objectives of the tests are to investigate:(1)the influence of earthquake history on the seismic response of wind turbines;(2)the influence of earthquake history on the dynamic pile-soil interaction;and(3)the influence of two different foundation types on the seismic response of wind turbines.The tests indicated that earthquake history has a significant influence on the natural frequency of the pile and the soil around the pile in the saturated sand,but has no obvious influence on the dry sand.The shear modulus of the soil and the acceleration amplification factor of the pile top in both tests increased and the maximum bending moment envelope of the single pile foundation shrunk.The stiffness of the p-y curve in saturated sand was increased by the earthquake history,while that in dry sand was not significantly affected. 展开更多
关键词 earthquake history effect wind turbine pile bending moment dry and saturated sand ground dynamic p-y curves
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Prediction of seismic-induced bending moment and lateral displacement in closed and open-ended pipe piles:A genetic programming approach
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作者 Laith Sadik Duaa Al-Jeznawi +2 位作者 Saif Alzabeebee Musab A.Q.Al-Janabi Suraparb Keawsawasvong 《Artificial Intelligence in Geosciences》 2024年第1期82-95,共14页
Ensuring the reliability of pipe pile designs under earthquake loading necessitates an accurate determination of lateral displacement and bending moment,typically achieved through complex numerical modeling to address... Ensuring the reliability of pipe pile designs under earthquake loading necessitates an accurate determination of lateral displacement and bending moment,typically achieved through complex numerical modeling to address the intricacies of soil-pile interaction.Despite recent advancements in machine learning techniques,there is a persistent need to establish data-driven models that can predict these parameters without using numerical simulations due to the difficulties in conducting correct numerical simulations and the need for constitutive modelling parameters that are not readily available.This research presents novel lateral displacement and bending moment predictive models for closed and open-ended pipe piles,employing a Genetic Programming(GP)approach.Utilizing a soil dataset extracted from existing literature,comprising 392 data points for both pile types embedded in cohesionless soil and subjected to earthquake loading,the study intentionally limited input parameters to three features to enhance model simplicity:Standard Penetration Test(SPT)corrected blow count(N60),Peak Ground Acceleration(PGA),and pile slenderness ratio(L/D).Model performance was assessed via coefficient of determination(R^(2)),Root Mean Squared Error(RMSE),and Mean Absolute Error(MAE),with R^(2) values ranging from 0.95 to 0.99 for the training set,and from 0.92 to 0.98 for the testing set,which indicate of high accuracy of prediction.Finally,the study concludes with a sensitivity analysis,evaluating the influence of each input parameter across different pile types. 展开更多
关键词 Genetic programming Pipe piles Lateral response bending moment Earthquake loading Standard penetration test Machine learning
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Centrifuge modeling of dynamic behavior of pile-reinforced slopes during earthquakes 被引量:4
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作者 于玉贞 邓丽军 +1 位作者 孙逊 吕禾 《Journal of Central South University》 SCIE EI CAS 2010年第5期1070-1078,共9页
A series of centrifuge model tests of sandy slopes were conducted to study the dynamic behavior of pile-reinforced slopes subjected to various motions.Time histories of accelerations,bending moments and pile earth pre... A series of centrifuge model tests of sandy slopes were conducted to study the dynamic behavior of pile-reinforced slopes subjected to various motions.Time histories of accelerations,bending moments and pile earth pressures were obtained during excitation of the adjusted El Centro earthquake and a cyclic motion.Under a realistic earthquake,the overall response of the pile-reinforced slope is lower than that of the non-reinforced slope.The histories of bending moments and dynamic earth pressures reach their maximums soon after shaking started and then remain roughly stable until the end of shaking.Maximum moments occur at the height of 3.5 m,which is the deeper section of the pile,indicating the interface between the active loading and passive resistance regions.The dynamic earth pressures above the slope base steadily increase with the increase of height of pile.For the model under cyclic input motion,response amplitudes at different locations in the slope are almost the same,indicating no significant response amplification.Both the bending moment and earth pressure increase gradually over a long period. 展开更多
关键词 EARTHQUAKE SLOPE stabilizing pile dynamic behavior centrifuge modeling earth pressure ACCELERATION bending moment
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Influence of pile spacing on seismic response of piled raft in soft clay: centrifuge modeling 被引量:1
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作者 Yang Jun Yang Min Chen Haibing 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2019年第4期719-733,共15页
In order to study the infl uence of pile spacing on the seismic response of piled raft in soft clay, a series of shaking table tests were conducted by using a geotechnical centrifuge. The dynamic behavior of accelerat... In order to study the infl uence of pile spacing on the seismic response of piled raft in soft clay, a series of shaking table tests were conducted by using a geotechnical centrifuge. The dynamic behavior of acceleration, displacement and internal forces was examined. The test results indicate that the seismic acceleration responses of models are generally greater than the surrounding soil surface in the period ranges of 2–10 seconds. Foundation instant settlements for 4×4 and 3×3 piled raft (with pile spacing equal to 4 and 6 times pile diameter) are somewhat close to each other at the end of the earthquake, but reconsolidation settlements are greater for 3×3 piled raft. The seismic acceleration of superstructure, the uneven settlement of the foundation and the maximum bending moment of pile are relatively lower for 3×3 piled raft. Successive earthquakes lead to the softening behavior of soft clay, which causes a reduction of the pile bearing capacity and thus loads are transferred from the pile group to the raft. For the case of a 3×3 piled raft, there is relatively smaller change of the load sharing ratio of the pile group and raft after the earthquake and the distribution of maximum bending moments at the pile head is more uniform. 展开更多
关键词 piled RAFT pile SPACING soft clay dynamic CENTRIFUGE model test seismic response SUBSIDENCE load sharing bending moment
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Interaction of Building Frame with Pile Foundation
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作者 Varnika Srivastava H. S. Chore P. A. Dode 《Open Journal of Civil Engineering》 2016年第2期195-202,共8页
The study deals with physical modeling of a typical building frame resting on a pile group embedded in cohesive soil mass using complete three-dimensional finite element analysis. The elements of the superstructure fr... The study deals with physical modeling of a typical building frame resting on a pile group embedded in cohesive soil mass using complete three-dimensional finite element analysis. The elements of the superstructure frame and that of the pile foundation are discretized using twenty node isoparametric continuum elements. The interface between the pile and pile cap is idealized using sixteen node isoparametric surface elements. The more improved finite element mesh is used for modeling soil element as compared to the one used in the study reported in the literature. The soil elements are discretized using eight node, nine node and twelve node continuum elements. Both the elements of superstructure and substructure (i.e., foundation) including soil are assumed to remain in elastic state at all the time. The interaction analysis is carried out using sub-structure approach to attempt a parametric study. The effect of the parameter such as spacing between the piles in a group and diameter of pile is evaluated on the response of superstructure. The response includes the displacement at the top of the frame. The effect of the soil-structure interaction is observed to be significant for the type of foundation and soil considered in the present study. 展开更多
关键词 Soil-Structure Interaction pile Groups pile Spacing pile Diameter Top Displacement bending moment
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Improved prediction of pile bending moment and deflection due to adjacent braced excavation
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作者 Chana PHUTTHANANON Pornkasem JONGPRADIST +2 位作者 Duangkamol SIRIRAK Prateep LUEPRASERT Pitthaya JAMSAWANG 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2023年第11期1739-1759,共21页
Deep excavations in dense urban areas have caused damage to nearby existing structures in numerous past construction cases.Proper assessment is crucial in the initial design stages.This study develops equations to pre... Deep excavations in dense urban areas have caused damage to nearby existing structures in numerous past construction cases.Proper assessment is crucial in the initial design stages.This study develops equations to predict the existing pile bending moment and deflection produced by adjacent braced excavations.Influential parameters(i.e.,the excavation geometry,diaphragm wall thickness,pile geometry,strength and small-strain stiffness of the soil,and soft clay thickness)were considered and employed in the developed equations.It is practically unfeasible to obtain measurement data;hence,artificial data for the bending moment and deflection of existing piles were produced from well-calibrated numerical analyses of hypothetical cases,using the three-dimensional finite element method.The developed equations were established through a multiple linear regression analysis of the artificial data,using the transformation technique.In addition,the three-dimensional nature of the excavation work was characterized by considering the excavation corner effect,using the plane strain ratio parameter.The estimation results of the developed equations can provide satisfactory pile bending moment and deflection data and are more accurate than those found in previous studies. 展开更多
关键词 pile responses EXCAVATION PREDICTION DEFLECTION bending moments
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液化场地单桩振动台响应试验研究
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作者 张爱军 唐显云 +5 位作者 李飞 侯爵 杨松松 成朝恒 何凌 章定文 《公路交通技术》 2024年第5期104-110,共7页
为探究场地液化对桩基础的危害,开展大尺寸振动台试验分析地震过程中孔压、桩与地基的沉降、加速度、桩弯矩及上部结构侧向位移等的响应规律。试验结果表明:1)地基的超孔压比迅速增大,砂土逐渐液化,液化导致桩体的加速度放大系数呈现减... 为探究场地液化对桩基础的危害,开展大尺寸振动台试验分析地震过程中孔压、桩与地基的沉降、加速度、桩弯矩及上部结构侧向位移等的响应规律。试验结果表明:1)地基的超孔压比迅速增大,砂土逐渐液化,液化导致桩体的加速度放大系数呈现减小趋势;2) 0.5g时上部结构的水平位移达到了桩径的33%,地震结束后上部结构的水平位移为桩径的156%,饱和砂土与非液化层交界面处桩体弯矩达到了桩头弯矩的106%;3)地震期间液化层与非液化层之间桩体弯矩产生突变,地震动结束后上部结构的水平位移不断增加,场地液化后的累积变形对结构稳定会产生严重影响。 展开更多
关键词 液化场地 弯矩 破坏模式 累积变形
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海上风电高桩承台基础结构的受力特性
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作者 祝周杰 詹懿德 +3 位作者 马彬 王海军 张晓雪 李秉轩 《深圳大学学报(理工版)》 CAS CSCD 北大核心 2024年第4期509-516,共8页
为研究海上风电高桩承台基础结构在风电机组大弯矩荷载及复杂海洋环境荷载作用下的受力及传力机理,采用在数值模型中逐级加载的方式,模拟不同荷载量级情况下基础受力特性,获得了高桩承台组合结构的关键承载部位,分析了混凝土承台及斜向... 为研究海上风电高桩承台基础结构在风电机组大弯矩荷载及复杂海洋环境荷载作用下的受力及传力机理,采用在数值模型中逐级加载的方式,模拟不同荷载量级情况下基础受力特性,获得了高桩承台组合结构的关键承载部位,分析了混凝土承台及斜向钢管桩受力特性.研究结果表明,随着风电机组荷载和环境荷载的增大,混凝土承台承载模式将由轴压承载向偏压转变;钢管桩顶部与混凝土承台接触部位是承载及荷载传递的关键部位,混凝土受拉损伤首先从此处开始;随着荷载的增大,斜向钢管桩群桩应力最大部位将从波流荷载作用点向泥面处转变.研究明晰了海上风电高桩承台基础的荷载传递规律及关键部位,为基础结构的安全设计提供了指导. 展开更多
关键词 结构工程 高桩承台 钢管桩 大弯矩荷载 传力机理 逐级加载 关键部位 荷载传递
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复合断面隧道受侧方沉桩影响的模型试验研究
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作者 吴长官 刘俊伟 《青岛理工大学学报》 CAS 2024年第5期33-42,共10页
打桩施工产生的冲击荷载和挤土效应可通过地层传递到隧道结构,需进行控制和监测来保证地铁隧道的正常运营。基于青岛地区的地层工况,采用室内模型试验研究复合断面隧道受旁侧沉桩施工的影响。试验中考虑了单桩、群桩、沉桩深度与桩隧间... 打桩施工产生的冲击荷载和挤土效应可通过地层传递到隧道结构,需进行控制和监测来保证地铁隧道的正常运营。基于青岛地区的地层工况,采用室内模型试验研究复合断面隧道受旁侧沉桩施工的影响。试验中考虑了单桩、群桩、沉桩深度与桩隧间距等因素,研究沉桩对既有隧道附加弯矩和振动效应的影响。结果表明:随着桩隧间距的增大,隧道的附加弯矩逐渐减小,附加弯矩的分布形态基本呈现出了隧道顶部和底部远离中心点位、左右两端靠近中心点位的趋势。当沉桩深度超过某一定值时,沉桩深度和桩隧间距对隧道振速有明显的影响。模型试验揭示了复合地层中沉桩施工对临近既有隧道的受力变形和动力响应规律,研究成果可为类似工况下隧道监测提供参考。 展开更多
关键词 隧道 沉桩 模型试验 附加弯矩 振速
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劲性复合桩承载性能现场试验研究
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作者 苏刚 陈信升 +2 位作者 李志越 戴国亮 邓亚光 《甘肃科学学报》 2024年第4期76-82,共7页
劲性复合桩是一种在水泥土桩中植入混凝土管桩的新型桩基础形式,是实现绿色低碳建造的重要技术手段。为研究劲性复合桩在近海地基土层中的承载性能,基于南通市洋吕铁路项目场地开展了劲性复合桩及其对应管桩的竖向和水平静载试验,通过... 劲性复合桩是一种在水泥土桩中植入混凝土管桩的新型桩基础形式,是实现绿色低碳建造的重要技术手段。为研究劲性复合桩在近海地基土层中的承载性能,基于南通市洋吕铁路项目场地开展了劲性复合桩及其对应管桩的竖向和水平静载试验,通过对比劲性复合桩和PHC管桩的现场试验结果,探讨了劲性复合桩的加固机理及变形规律。试验结果表明:劲性复合桩极限承载力提高显著,竖向承载力较PHC管桩提高了48%,其中桩侧阻力最高增幅达58%,桩端阻力仅占比3.75%,属于摩擦型桩;水平承载力提高了50%,桩顶转角稳定;在变形上,劲性复合桩桩头刚度提升明显,且回弹率高\,卸载后残余变形小;此外无论是竖向受荷时的桩侧阻力峰值点还是水平受荷时的桩身弯矩峰值点,劲性复合桩较管桩均呈明显上移,充分发挥了浅层土体的承载性能,在未来工程设计中可采用此桩基形式进一步优化桩长。 展开更多
关键词 劲性复合桩 现场试验 极限承载力 桩侧阻力 桩身弯矩
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Finite Element Analysis of Effects of Improvement of Soil Between Double-Row Piles
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作者 NIE Dongqing ZHAI Zhiyang +1 位作者 ZHANG Wei LI Zhi 《Journal of Shanghai Jiaotong university(Science)》 EI 2024年第5期919-929,共11页
Double-row pile(DRP)retaining systems have been widely used in deep excavations in China.Soil between the front and back-row piles(FBP soil)is often improved to decrease the displacement of DRPs in soft soil areas,but... Double-row pile(DRP)retaining systems have been widely used in deep excavations in China.Soil between the front and back-row piles(FBP soil)is often improved to decrease the displacement of DRPs in soft soil areas,but the improvement efficiency has rarely been researched.A large and deep excavation supported by a DRP retaining system is introduced,and the effect of FBP soil improvement is discussed by comparing the finite element analysis and the monitoring results.Then,a parametric study of DRP using the finite element method considering the small strain of soil is conducted to investigate the effect of FBP soil improvement.It was shown that the pile deflection and bending moment decrease when the FBP soil is improved.Moreover,the most efficient way to minimize the pile deflection and bending moment is to improve the FBP soil around the excavation level.The FBP soil improvement 2-4 m below the pile head is not very useful for reducing the pile deflection and can be eliminated when the pile displacement limit is not very strict. 展开更多
关键词 large excavation double-row pile(DRP) soil improvement DEFLECTION bending moment finite element analysis
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抗滑桩加固不同坡率边坡的效果及机理分析
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作者 王仕传 桑闯庆 《地质与勘探》 CAS CSCD 北大核心 2024年第5期1040-1053,共14页
针对不同坡率边坡,采用ABAQUS软件对抗滑桩加固边坡前后的稳定性进行强度折减有限元分析。基于边坡安全系数和桩身弯矩讨论不同坡率下的最优桩位,并结合增量位移云图分析最优桩位下不同桩长、桩间距、桩截面尺寸对边坡稳定性的影响。分... 针对不同坡率边坡,采用ABAQUS软件对抗滑桩加固边坡前后的稳定性进行强度折减有限元分析。基于边坡安全系数和桩身弯矩讨论不同坡率下的最优桩位,并结合增量位移云图分析最优桩位下不同桩长、桩间距、桩截面尺寸对边坡稳定性的影响。分析结果表明:最优桩位受坡率影响显著,随坡率增大有向坡中移动趋势,坡率1∶2时,最优桩位在L_(x)/L=0.8处;坡率1∶1和2∶1时,最优桩位在L_(x)/L=0.6处。坡率1∶2、1∶1和2∶1对应的安全系数分别为1.581、1.171、0.980,相较于无桩时提高约10%、17%、40%,增幅逐渐增大,可见坡率越大抗滑桩取得的加固效果越好;安全系数随着桩长的增长先增大后趋于稳定,坡率越大趋于稳定值越快;随着桩间距的增加而减小,坡率越大减小速率越大;随着桩截面尺寸的增大先增大后趋于稳定,坡率越大趋于稳定值越早。 展开更多
关键词 抗滑桩 强度折减 安全系数 桩身弯矩 最优桩位
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考虑桩-土摩阻效应的桥梁桩基水平承载特性研究
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作者 张燕军 《施工技术(中英文)》 CAS 2024年第5期134-138,共5页
为研究桥梁大直径桩基在水平荷载作用下,桩-土效应对其力学特性的影响程度,结合新建重庆至昆明高速铁路毛家村水库特大桥大直径桩基项目,运用理论解析方法,基于弹性地基梁模型和p-y曲线法求解桩基水平承载力,考虑桩-土摩阻效应,比较理... 为研究桥梁大直径桩基在水平荷载作用下,桩-土效应对其力学特性的影响程度,结合新建重庆至昆明高速铁路毛家村水库特大桥大直径桩基项目,运用理论解析方法,基于弹性地基梁模型和p-y曲线法求解桩基水平承载力,考虑桩-土摩阻效应,比较理论值与现场实测值,并研究桩-土界面摩擦角和桩直径敏感参数。结果表明,桩顶水平承载力和桩身最大弯矩在κ=06φ时的计算值与实测值对比效果良好。随着桩-土界面摩擦角增加,桩侧摩阻力、桩身附加轴力和桩身附加弯矩不断增加,随着桩直径增加,桩顶位移折减比和桩身最大弯矩折减比均呈线性减小。 展开更多
关键词 桥梁 桩基 水平承载力 桩-土摩阻效应 弯矩
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h型抗滑桩受力性能模型试验研究
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作者 邓友生 杨彪 +2 位作者 姚志刚 高宁 肇慧玲 《大连交通大学学报》 CAS 2024年第1期73-77,共5页
针对h型抗滑桩在坡顶荷载作用下的受力特征,通过室内模型试验,分析h型抗滑桩的前桩与后桩的受力机理、桩身弯矩和桩前土压力分布特性。结果表明:在坡顶均布荷载作用下,后排桩的桩身弯矩随桩体埋深的增大呈先增大后减小的抛物线分布,弯... 针对h型抗滑桩在坡顶荷载作用下的受力特征,通过室内模型试验,分析h型抗滑桩的前桩与后桩的受力机理、桩身弯矩和桩前土压力分布特性。结果表明:在坡顶均布荷载作用下,后排桩的桩身弯矩随桩体埋深的增大呈先增大后减小的抛物线分布,弯矩峰值出现在预设滑面附近;前排桩的桩身弯矩随桩体埋深的增大而增大,弯矩峰值出现在桩顶连梁连接处;后排桩桩前土压力分布随着坡顶荷载的增大而增大,而上部两个测点相对变化幅度较小;在连梁以下部位,前排桩桩前土压力分布趋势与后排桩变化趋势基本一致,而连梁位置处偏小。 展开更多
关键词 h型抗滑桩 模型试验 桩身弯矩 桩前土压力
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基坑开挖下倾斜长短组合桩受力及土体位移数值模拟
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作者 杜泽轩 汪东林 孙浩 《安徽工业大学学报(自然科学版)》 CAS 2024年第5期535-544,共10页
利用软件Midas GTS NX建立基坑支护模型,模拟分析基坑开挖过程中不同倾斜长短组合桩支护下,基坑土体位移及桩身水平位移与弯矩变化的规律;探讨组合桩桩长分配与长桩倾角对支护效果的影响。结果表明:基坑开挖过程中,随着开挖深度的增加,... 利用软件Midas GTS NX建立基坑支护模型,模拟分析基坑开挖过程中不同倾斜长短组合桩支护下,基坑土体位移及桩身水平位移与弯矩变化的规律;探讨组合桩桩长分配与长桩倾角对支护效果的影响。结果表明:基坑开挖过程中,随着开挖深度的增加,一定程度地增加长桩倾角能够有效减小土体变形和桩身水平位移,开挖面以下桩身最大弯矩也随长桩倾角的增加而减小;在总桩长一定时,最佳桩长分配受长桩倾角影响存在临界值,在长桩倾角临界值以下最佳桩长分配受倾角变化影响,在长桩倾角临界值以上长桩越长支护效果越好。在同一开挖深度下,桩身水平位移与长桩倾角有关,长桩倾角在开挖面以上相对于开挖面以下对桩身位移影响更大;开挖面以下,部分桩身最大弯矩与桩长成正比。 展开更多
关键词 基坑开挖 基坑支护 组合桩 土体位移 桩身弯矩 桩身位移 数值模拟
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粘土中钻孔灌注桩墙体支护开挖弯矩数值模拟研究
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作者 段海强 《建筑技术》 2024年第16期2030-2033,共4页
针对粘土中钻孔灌注桩墙体支护开挖弯矩数值进行模拟,研究弯矩数值对钻孔灌注桩墙体支护开挖工程的影响程度。采用有限元软件Midas NX,结合模型构建的四点原则,通过计算墙体支护材料的弹性模量、体积模量和剪切模型,得到相应的墙体支护... 针对粘土中钻孔灌注桩墙体支护开挖弯矩数值进行模拟,研究弯矩数值对钻孔灌注桩墙体支护开挖工程的影响程度。采用有限元软件Midas NX,结合模型构建的四点原则,通过计算墙体支护材料的弹性模量、体积模量和剪切模型,得到相应的墙体支护参数,结合工程的实际情况,确定模拟模型的边界范围,通过对墙体外的地下水的降水处理,构建相应的钻孔灌注桩墙体支护模拟模型,并对测点进行布置。利用上述参数,进行模拟测试,并通过布设的测点记录墙体支护开挖后桩身的变形情况。钻孔灌注桩墙体支护开挖后,桩身的最大变形量为6.02 mm,桩身的弯矩值为500 KN·m。钻孔灌注桩墙体支护的弯矩值受到多种因素的影响,其中变形量对桩身弯矩值的影响最大。 展开更多
关键词 粘土 钻孔灌注桩 墙体支护开挖 弯矩 数值模拟
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销钉式抗拔管桩接头抗弯性能试验研究
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作者 曹伟伟 严天龙 张芳芳 《混凝土与水泥制品》 2024年第9期52-57,共6页
为提高预制混凝土桩的桩间连接质量,研发了一种销钉式机械连接接头。通过销钉式机械连接、销钉式机械连接与焊接连接组合的预制桩桩间接头的抗弯性能试验,对比分析了两种连接方式的受弯承载力、破坏特性与裂缝分布情况。结果表明:两种... 为提高预制混凝土桩的桩间连接质量,研发了一种销钉式机械连接接头。通过销钉式机械连接、销钉式机械连接与焊接连接组合的预制桩桩间接头的抗弯性能试验,对比分析了两种连接方式的受弯承载力、破坏特性与裂缝分布情况。结果表明:两种连接方式的管桩接头试件的开裂弯矩与极限弯矩试验值均大于理论值,满足设计要求;销钉式连接的管桩接头试件破坏形式为销钉受拉脱落,销钉式连接和焊接组合的管桩接头试件破坏形式为接头受压面混凝土破坏;两种连接方式的管桩接头试件在桩身裂缝出现前,各混凝土测点应变呈线性增长,试件跨中截面应变分布基本满足平截面假定。 展开更多
关键词 抗拔管桩 机械接头 抗弯性能 开裂弯矩 极限弯矩 裂缝分布
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锚索抗滑桩在边坡治理工程中的应用
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作者 佘雪伟 《江西建材》 2024年第6期203-204,209,共3页
为了优选合理的锚索抗滑桩施工方案,文中依托某路堑边坡项目,建立锚索抗滑桩的仿真模型,利用MIDAS软件模拟分析预应力锚索抗滑桩的稳定性及力学变形特性。结果表明,未设置支护的边坡工程稳定性系数为1.03,边坡稳定性系数随着抗滑桩截面... 为了优选合理的锚索抗滑桩施工方案,文中依托某路堑边坡项目,建立锚索抗滑桩的仿真模型,利用MIDAS软件模拟分析预应力锚索抗滑桩的稳定性及力学变形特性。结果表明,未设置支护的边坡工程稳定性系数为1.03,边坡稳定性系数随着抗滑桩截面尺寸的增加以及预应力的增加而逐渐增加;随着桩深的增加,抗滑桩的水平位移初期不断增加,工况3条件下抗滑桩的桩底水平位移最低,即工况3支护方案的边坡抗变形能力最强。随着桩深的增加,抗滑桩的剪力表现为先负向降低、后正向增加、后降低、再次反向增加的变化规律,抗滑桩的弯矩表现为先降低、后增加、再降低的变化规律。 展开更多
关键词 边坡工程 锚索抗滑桩 数值模拟 水平位移 剪力 弯矩
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基坑开挖对群桩基础水平位移与弯矩的影响分析
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作者 王振峰 《广东建材》 2024年第4期87-89,共3页
为探究基坑开挖对群桩基础水平位移与弯矩的影响,依托具体工程实例,进行有限元数值模拟,确定群桩基础与围护结构参数。根据模拟结果分析基坑开挖对群桩基础水平位移和弯矩的影响,得到基坑施工与群桩基础加载相互影响规律,为相类似工程... 为探究基坑开挖对群桩基础水平位移与弯矩的影响,依托具体工程实例,进行有限元数值模拟,确定群桩基础与围护结构参数。根据模拟结果分析基坑开挖对群桩基础水平位移和弯矩的影响,得到基坑施工与群桩基础加载相互影响规律,为相类似工程项目的建设方案制定提供依据。 展开更多
关键词 基坑 开挖 群桩 基础 水平位移 弯矩
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双排桩护岸在高边坡航道“三改二”工程中的应用
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作者 王智海 王曙光 +1 位作者 张楠 郑子涵 《水运工程》 2024年第10期176-181,199,共7页
双排桩具有施工方便、受力条件好、变形小等优点,广泛应用在各类临时工程和永久工程中。本文以某高边坡航道“三改二”工程为例,基于施工过程对双排桩护岸进行有限元分析,探求合理的桩长和桩距,并以此分析航道开挖过程中双排桩位移和弯... 双排桩具有施工方便、受力条件好、变形小等优点,广泛应用在各类临时工程和永久工程中。本文以某高边坡航道“三改二”工程为例,基于施工过程对双排桩护岸进行有限元分析,探求合理的桩长和桩距,并以此分析航道开挖过程中双排桩位移和弯矩的变化情况。计算结果表明:1)桩长的增加会明显降低双排桩的最大水平位移,但对双排桩最大正、负弯矩影响较小。2)桩距的增加将略微增大双排桩的最大水平位移,但显著增大双排桩最大正、负弯矩。3)综合考虑结构位移、结构内力和工程造价等因素,该工程前、后排桩的桩长均为22.0 m,前、后排桩的桩距分别为1.0和3.0 m。4)随着开挖深度的增大,前、后排桩的最大水平位移和最大正、负弯矩均显著增加。 展开更多
关键词 双排桩 高边坡航道 桩长 桩距 最大水平位移 最大正、负弯矩
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