水力发电学报2012，Vol.31Issue(6)：237-241,185,6.
层状岩体中大跨度地下洞室拱肩开裂机理分析
Analysis of cracking mechanism at the spandrel of large underground opening in laminar rock strata
摘要
Abstract
The underground cavern group of the Ludila hydropower station is one of the largest underground projects on Jinsha River.When its excavation was completed,a number of splits appeared at its downstream spandrel,a similar phenomena that has been found in other underground powerhouses.This work took the Ludila underground powerhouse as a case study to find the causes for such phenomenon that is vital to stability of large caverns,and to explore reasonable reinforcement measures,through analyzing the geological features,initial stress,monitored displacements and numerical simulations.The results indicate that stress concentration was induced by tilt geo-stress and anisotropy of the rock mass and rock deflection at the downstream spandrel under excavation unloading.A concept of deflection index is put forth for evaluation of the depths and range of the splits.关键词
岩土力学/稳定性/数值分析/地下洞室/挠曲变形Key words
rock and soil mechanics/stability/numerical analysis/underground opening/deflection deformation分类
建筑与水利引用本文复制引用
何敏,王明疆,郝军刚,李宁..层状岩体中大跨度地下洞室拱肩开裂机理分析[J].水力发电学报,2012,31(6):237-241,185,6.基金项目
国家自然科学基金 （）
国家自然科学基金创新群体 （）
