摘要
基于二维稳定渗流理论推导基坑工程井点降水引起的水位降低空间分布,根据有效应力原理建立地面沉降计算模型,并简化为分层总和法形式的计算公式。三个工程实例对比了水位降低,理论地面沉降和实测地面沉降,验证了建议的计算公式。认为:从空间分布看,地面沉降与水位降低深度的平方成正比;地面沉降比降水影响范围小,但其相关性随土层侧限压缩模量离散性增大而减弱。基坑周围环境中的堆载、运输等活动对地面沉降大小和分布都会产生影响。
Based on 2-D steady flow theory,the space character of conic surface of low water caused by foundation pit dewatering is deduced. By Effective Stress Principle （ESP）, the ground settlement calculation model is established and the simplified calculation formula in the form of laminated settlement accumulation method obtained, which is recommended in the current national code. The analysis reveals that the ground settlement is in direct proportion to the two-time-power of value of lowered water level. In three practical cases,the lowered water level, calculated ground settlement and practical surveyed settlement are compared. It is supposed that the scope of ground settlement is rather smaller than the water lowering influence area, and their relationship is obscured by the variation of compression modulus of site soil. At the same time, the heaped load and traffic load in the adjacent area of foundation pit play an important role in the ground settlement.
出处
《建筑科学》
北大核心
2006年第3期26-30,10,共6页
Building Science
基金
郑州大学青年骨干教师资助计划项目
关键词
环境岩土工程
基坑降水
抽水影响半径
分层总和法
沉降
environmental geotechnics
foundation pit dewatering
radius of dewatering influence
laminated settlement accumulation method （I.SAM）
settlement
