摘要
针对软土地区不透水隔水层承压水基坑,从坑底土产生塑性变形破坏的力学机理出发,建立了基于塑性破坏的承压水基坑突涌计算模型,提出了屈服应力比概念和基坑突涌判断标准。用考证实例将模型计算结果与离心试验结果、现场观察结果以及压力平衡理论计算结果进行了比较。结果表明:模型计算结果与离心模型试验结果和现场观察结果比较吻合;而压力平衡理论判断结果与离心模型试验结果和现场观察结果有较大出入。因此,对于软土地区坑底存在不透水隔水层的承压水基坑,采用突涌塑性破坏模型分析基坑抗突涌稳定性是合理可靠的。
Aiming at foundation pits （of impervious aquiclude） with confined underground water in soft soil area, calculation model for piping based on plastic deformation failure is developed from piping mechanism of soil under foundation pits, and the concept of yield stress ratio ＆ judgement standard of piping for foundation pits are presented. Calculation results of examples were compared with results of centrifuge test, field observation and pressure balance method. The results show that, the calculation results of the model agreed well with the results of the test and the field observation, but the results of the pressure balance method were not consistent with the results of the test anti the field observation. Therefore, it is rational to adopt the model of piping based on plastic failure for foundation pits （of impervious aquiclude） with confined underground water.
出处
《工程力学》
EI
CSCD
北大核心
2007年第11期126-131,共6页
Engineering Mechanics
基金
软土地区承压水基坑突涌计算模型及突涌控制参数研究项目(40772178)
关键词
基础工程
基坑
承压水
不透水隔水层
突涌
塑性破坏
计算模型
foundation engineering
foundation pit
confined underground water
impervious aquiclude
piping of soil and water
plastic failure
calculation model
