岩土力学2011，Vol.32Issue(5)：1553-1560,8.
高地应力条件下地下厂房开挖动态卸荷引起的变形突变机制研究
Mechanism study of abrupt deformation of underground powerhouse induced by excavation unloading under high in-situ stress
摘要
Abstract
The mechanism of abrupt large deformation in the sidewall of underground powerhouse is analyzed.The surrounding rock mass dynamic loosening is concemed as a main cause of abrupt deformation in underground powerhouse.Based on the monitored data at Pubugou hydropower station, numerical analysis is conducted with finite element method; and horizontal displacements induced by excavation load quasi-static and dynamic unloading arc calculated respectively.The result itself and comparison to monitored data show that sliding and opening on structural surfaces induced by excavation load dynamic unloading are the major causes of abrupt large deformation in underground powerhouse, but which is not so obvious under quasi-static unloading.In actual projects the transient effect of in-situ stress unloading should be considered; and the disturbance in the surrounding rock mass during each operation should be minimized to avoid potential abrupt large deformation.or even instability.关键词
地下厂房/地应力/动态卸荷/变形突变/岩体开挖分类
建筑与水利引用本文复制引用
罗忆,卢文波,周创兵,陈明,严鹏..高地应力条件下地下厂房开挖动态卸荷引起的变形突变机制研究[J].岩土力学,2011,32(5):1553-1560,8.基金项目
国家973计划项目(No.2010CB732003) （No.2010CB732003）
国家自然科学基金项目(No.50725931,No.50909077). （No.50725931,No.50909077）
