引黄入晋工程深部地应力场及其影响

山西省万家寨引黄入晋工程,是一项以地下工程为主的大型跨流域引水工程.为了解深部地应力场对工程的影响,采用钻孔水压致裂法测定不同深度地应力量值及最大主应力方向,并在此基础上,就深部地应力场对引黄入晋工程地下厂房长轴方向布设以及深埋长隧洞的影响等展开讨论.地下厂房长轴方向的选择,一般要尽可能使厂房纵轴线与主要地质结构面有较大的交角,并使厂房纵轴线与最大水平主应力(σH)方向平行或小角度相交.在高地应力场作用下,深埋隧洞的工程地质问题主要为脆性围岩岩爆和塑性围岩变形.

Discuss on Geo-stress at Great Depth and Its Effect to Wanjianzhai Yellow River Diversion Project

Wanjianzhai Yellow River Diversion Project is large crossing river basin water conveyance mainly by underground openings.In order to determine the distribution of geo-stress at depth,hydraulic fracture tests were performed in boreholes at different depth.Based on which its effect on layout of underground powerhouse and tunneling conditions at great depth of this project were discussed.In general,the longitudinal axis of powerhouse should be laid out sub-parallel to the maximum horizontal stress and having a large included angle with the strike of major discontinuities as near as possible.For long tunnel at great depth with high geo-stress,attentions should be paid duly to hard rock popping and bursting and soft rock deformation.