水力发电2012，Vol.38Issue(8)：51-54,4.
大型洞室分层开挖围岩位移释放率与支护效用探讨
Discussion on Displacement Release Ratio and Supporting Effectiveness of Wall Rock in the Excavation of Large Underground Cavern
揭秉辉 1江权2
作者信息
- 1. 二滩水电开发有限责任公司,四川成都6100511
- 2. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071
- 折叠
摘要
Abstract
Considering the characters of trenching layer by layer from up to down and tunneling from out to out in every layer in the excavation course of large underground cavern, the displacement release ratio of wall rock is studied based on the stress inversion method, and the supporting effectiveness of supported structure is also quantitatively evaluated based on Mohr stress circle. The case study of an large hydropower underground powerhouse shows that, (a) the displacement release ratios of wall rock in different crown and side position are different before, during and after excavation; (b) the yield volume of wall during excavation is a typical nonlinear process, which is related to the stress release ratio; and (c) the system supporting effectiveness in different displacement release condition can be evaluated by contrasting the distances of Mohr stress circle of supported wall rock to strength characteristic line before and after excavation.关键词
位移释放率/支护效应/分层开挖/大型地下洞室Key words
displacement release ratio/ supporting effectiveness/ stage excavation/ large underground cavern分类
建筑与水利引用本文复制引用
揭秉辉,江权..大型洞室分层开挖围岩位移释放率与支护效用探讨[J].水力发电,2012,38(8):51-54,4.
