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Study on development in reinforced soil systems effective for prevention of large deformation and progressive failure in ground

有效防止地基大变形和渐进破坏的加筋土系统的开发研究

基本信息

批准号：
09555150
负责人：
ASAOKA Akira
金额：
$ 8.38万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555150/
关键词：
Soil-water Coupled Analysis Large Deformation Overconsolidated Soil Reinforced Soil Constraint Condition Excavation Progressive Failure Finite Element Method 加圧密土堀削

项目摘要

In this study, some preventive/reductive systems of large deformation in ground that may lead to fatal damages in construction projects are investigated using soil-water coupled elasto-plastic deformation analysis. The findings of the study mainly for a piled raft system and earth retaining system are summarized as follows :Deformation characteristics of a piled raft foundation system under different ground and loading conditions are studied. The pile-raft system is simulated introducing some linear constraint conditions over the velocity field in plane strain condition. The system reduces the final settlement significantly. This reduction is due to the load transfer through shear by piles into deeper soil layers that disperse the induced stresses compared with only the raft. Further, the pile-raft system induces homogeneous settlement even with eccentric loading. In addition, behavior of the system under liquefaction in a sandy ground is studied. It also diminishes the liquefaction of the sandy ground, and prevents inhomogeneous settlement under the liquefaction of ground.Progressive failure of the excavated slopes in overconsolidated state is studied. The recognition of the soil behavior in excavation leads to realistic evaluation of earth pressure on retaining structures. The ground with retaining structures exhibits stability and the axial forces and bending moment etc. show the time-dependent behavior due to pore water migration.

本文采用土-水耦合弹塑性变形分析方法，对工程中可能导致重大破坏的地基大变形的预防/减少系统进行了研究。主要针对桩筏基础和挡土结构进行了研究，主要成果如下：研究了桩筏基础在不同地基和荷载条件下的变形特性。对桩筏体系在平面应变条件下的速度场引入线性约束条件进行了数值模拟。该系统大大减少了最终结算。这种减少是由于荷载通过桩的剪切传递到更深的土层中，与仅筏板相比，更深的土层分散了诱导应力。此外，桩筏系统诱导均匀沉降，即使偏心荷载。此外，在一个桑迪地基液化下的系统的行为进行了研究。研究了超固结状态下开挖边坡的渐进破坏。对基坑开挖过程中土体性状的认识有助于对支护结构土压力的真实评估。由于孔隙水的运移，具有挡土结构的地基表现出稳定性，轴力和弯矩等表现出时间相关性。