Lateral displacement of soft ground under vacuum pressure and surcharge load
Lateral displacement of soft ground under vacuum pressure and surcharge load
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DOI：
10.1007/s11709-011-0110-1
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发表时间：
2011-05
期刊：
影响因子：
--
通讯作者：
C. Ong;J. Chai
中科院分区：
文献类型：
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作者：
C. Ong;J. Chai
超载荷载（如路堤填土）会引起地基沉降和向外的侧向位移，而真空压力会引起地基沉降和向内的侧向位移。理想情况下，超载荷载和真空压力的组合可以减少或最小化侧向位移。通过室内大型模型（长1.50 m，宽0.62 m，高0.85 m）试验和有限元分析，研究了真空压力和堆载联合作用下软土地基侧向位移的主要影响因素。结果表明，在所研究的条件下，随着堆载真空比（RL）和堆载加载速率（LR）的增大，地基的向外侧移增大。对于给定的RLandLR条件，侧向位移随地基初始不排水抗剪强度（Su）的增大而减小。为了预测在堆载和真空压力联合作用下地基的侧向位移，必须考虑地基的RLandLR和Su值的加载条件。
Surcharge load (e.g. embankment fill) will induce settlement and outward lateral displacement, while vacuum pressure will induce settlement and inward lateral displacement of a ground. Ideally, combination of surcharge load and vacuum pressure can reduce or minimize the lateral displacement. Laboratory large scale model (length: 1.50 m, width: ∼0.62 m, height: 0.85 m) tests and finite element analyses (FEA) were conducted to investigate the main influencing factors on lateral displacement of a soft clayey ground under the combination of vacuum pressure and surcharge load. For the conditions investigated, the results indicate that the outward lateral displacement increases with the increase of the ratio of surcharge load to vacuum pressure (RL) and the loading rate of the surcharge load (LR). Also, it is shown that for a givenRLandLRcondition, lateral displacement reduces with the increase of the initial undrained shear strength (Su) of the ground. To predict the lateral displacement of a ground under the combination of surcharge load and vacuum pressure, the loading conditions in terms ofRLandLR, andSuvalue of the ground have to be considered.