复杂环境下地铁深基坑水土压力的实测研究  

Measurement on Earth Pressure and Pore Pressure of Deep Metro Excavation under Complex Environment

作　　者：赵帮亚[1] 李玮靓[2] 

机构地区：[1]江苏省交通科学研究院,江苏南京210017 [2]江苏省基础地理信息中心,江苏南京210013

出　　处：《现代交通技术》2010年第1期57-59,共3页Modern Transportation Technology

摘　　要：通过对开挖深度为15.5m的多支撑基坑水土压力的现场实测,发现基坑开挖期间实测的孔压随着开挖引起的应力释放而逐渐降低,在中板浇筑和养护期间,孔压持续恢复性增加。受地下墙施工和养护的影响,开挖前的初始土压力与Jaky公式计算的静止土压力并不一致,开挖期间不同深度位置的土压力变化规律与挡墙的变形密切相关。In this paper, pore pressure and earth pressure at 15.5 m deep of a multi-braced excavation are monitored. It is found that the measured pore pressures reduced with stress release during construction ,and the pore pressures are increasing continuously during the construction and curing of middle slab.The initial earth pressure before excavation is inconsistent with static earth pressure computed by Jaky formulae, and changes of earth pressure at various depths are connected with the lateral deformation of retaining wall during excavation.

关 键 词：基坑 水土压力 监测 应力路径 

分 类 号：U452.27[建筑科学—桥梁与隧道工程]