输水隧洞穿越断层破碎带施工力学效应分析

水利工程中的大坝、输水隧洞、泄水建筑、铁路与公路隧道等均会遇到断层；本文以大伙房水库输水工程27+ 500 m～27+ 560 m断面破碎断层为工程背景,建立三维有限元数值模型,进行了断层破碎带施工的围岩力学效应分析.研究表明:断层破坏了原岩体介质的连续性,使水平及垂直应力分布失去对称性,出现明显的“偏压”现象.在断层...

Analysis on Mechanical Effect of the Water Conservancy Tunnel Passing through Fault Fracture Zone

Dams of water conservancy project,convey tunnels and discharge water constructions,railways and highway tunnels may encounter faults.This paper is based on fault fracture zone of Dahuofang water conveyance project at 27 + 500m ~ 27 + 560 m as engineering background,to set up three-dimensional finite element numerical model and carry on numerical simulation of influence of construction in fault fracture zone on stability of surrounding rock.Research shows that the faults destroy the continuity of original rock medium and the symmetry of horizontal and vertical stress distribution,so the apparent ’bias’ appears.The appearance of high shear stress area in the arch foot and sidewall where the faults pass,causes internal force of the primary support area increasing by 120~130%,and leads to increase of great displacement of the arch foot and sidewall.Therefore,it is suggested that the advanced support measures should be taken(including consolidation grouting,leading anchoring and advanced small catheter installation) during construction in the fault fracture zone and the secondary lining should follow the primary support construction closely,to make full use of time space effect in order to maximize control of deformation at cavern construction stage to ensure the stability and safety of the work.