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.

在这项研究中，使用土-水耦合弹塑性变形分析研究了一些可能导致建筑项目致命损坏的地面大变形的预防/减少系统。主要针对桩筏基础体系和挡土体系的研究结果总结如下：研究了桩筏基础体系在不同地面和荷载条件下的变形特征。对桩筏系统进行了模拟，引入了平面应变条件下速度场的一些线性约束条件。该系统显着减少了最终结算。这种减少是由于桩通过剪力将荷载转移到更深的土层中，与仅筏相比，这些土层分散了引起的应力。此外，即使在偏心荷载的情况下，桩筏系统也会引起均匀沉降。此外，还研究了系统在沙地液化下的行为。减少沙地基的液化，防止地基液化作用下的不均匀沉降。对超固结状态下开挖边坡的渐进破坏进行了研究。对开挖过程中土壤行为的认识可以对支护结构上的土压力进行实际评估。具有支护结构的地面表现出稳定性，并且由于孔隙水迁移，轴力和弯矩等表现出随时间变化的行为。