CCS水电站引水竖井不良地质段块体稳定性分析
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摘要
2号引水竖井布置于CCS水电站压力管道上、下平段之间,埋深超过500 m。依据开挖揭示的地质条件,竖井1 086~1 110 m高程段出露3条陡倾角断层及1条陡倾角侵入岩脉,各结构面之间相互交切,在竖井后续开挖中,易形成不稳定块体。运用UNWEDGE软件分析可能形成不稳定块体的结构面组合,计算其安全系数,并对原设计支护参数进行调整,及时预报,确保竖井围岩稳定。
2# diversion shaft of CCS hydropower station locates between the upper and lower horizontal section of penstock,the depth is over 500 m. According to the geological conditions exposed by excavation,1 086 m ~ 1 110 m elevation segment outcrops 3 steep faults and a steep dike,and the structure surfaces cut with each other,which is prone to form unstable blocks during the following excavation. The structure surface combination that could form unstable blocks in1 040 m ~ 1 086 m elevation segment and the safety factor are analyzed by UNWEDGE program. And the original design support parameters are adjusted with calculation results,in order to ensure the stability of surrounding rock mass of shaft.
2# diversion shaft of CCS hydropower station locates between the upper and lower horizontal section of penstock,the depth is over 500 m. According to the geological conditions exposed by excavation,1 086 m ~ 1 110 m elevation segment outcrops 3 steep faults and a steep dike,and the structure surfaces cut with each other,which is prone to form unstable blocks during the following excavation. The structure surface combination that could form unstable blocks in1 040 m ~ 1 086 m elevation segment and the safety factor are analyzed by UNWEDGE program. And the original design support parameters are adjusted with calculation results,in order to ensure the stability of surrounding rock mass of shaft.
引文
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[18]Yellow River Engineering Consulting Co.,Ltd.The Basic Report of Coca-Codo Sinclair Hydroelectric project[R].Zhengzhou:Yellow River Engineering Consulting Co.,Ltd.,2011.
[2]徐栓强,侯卫.考虑岩体中间主应力效应的竖井稳定性分析[J].地下空间与工程学报,2007,3(6):1168-1170.
[3]徐士良,崔振东.秦岭公路隧道2号竖井地应力与岩爆分析[J].工程地质学报,2010,18(3):407-412.
[4]ZHANG Y P,WENG C L,CHI E N.A new method of cut-blasting for vertical shaft excavation and its experimental study[J].Journal of Coal Science&Engineering(China),2010,16(1):17-22.
[5]LI G F,TAO Z G,GUO H Y,et al.Stability control of a deep shaft insert[J].Mining Science and Technology,2010,20(4):491-498.
[6]邵冠慧,李晓昭,赵晓豹,等.不同变形失稳模式下隧道围岩稳定性判据研究的进展[J].防灾减灾工程学报,2009,29(5):577
[7]干昆蓉.地下工程围岩稳定分析方法存在的问题与思考[J].铁道工程学报,2003,1(77):48-52.
[8]鄢建华,汤雷.水工地下工程围岩稳定性分析方法现状与发展[J].岩土力学,2003(增2):861-865.
[9]王能峰,尹显科,周云金,等.瀑布沟水电站主变室排风排烟竖井围岩稳定性分析[J].水电站设计,2010,26(2):59-60.
[10]SHI G H,GOODMAN R E.A new concept for support of underground and surface excavation in discontinuous rocks based on a keystone principle[C]//proceedings of the 22nd U.S.Symposium on Rock Mechanics,1981:310-370.
[11]GOODMAN.R.E,SHI G H.Block theory and its application to rock engineering[M].New Jersey:Prentice-Hall,1985.
[12]刘阜羊,朱珍德,孙少锐.块体理论及其在洞室围岩稳定分析中的应用[J].地下空间与工程学报,2006,2(8):1408-1414.
[13]崔银祥,聂德新,陈强.某电站大型地下洞室群主变洞确定性块体稳定性评价[J].工程地质学报,2005,13(20):212-217.
[14]胡义,徐光黎,申艳军,等.块体理论在水电站洞室围岩稳定分析中的应用[J].地下空间与工程学报,2009,5(增刊):1370-1375.
[15]刘义虎,张志龙,付励,等.Unwedge程序在雪峰山隧道围岩块体稳定性分析中的应用[J].中南公路工程,2006,31(2):31-33.
[16]刘军,谢晔,柴贺军,等.Unwedge(2.35)程序在分析块体稳定性中的应用[J].工程地质学报,2002,10(1):78-82.
[17]王能峰,周云金,尹显科,等.以瀑布沟水电站为例浅析UNWEDGE程序在地下洞室开挖支护中的应用[J].水电站设计,2006,22(2):105-107.
[18]Yellow River Engineering Consulting Co.,Ltd.The Basic Report of Coca-Codo Sinclair Hydroelectric project[R].Zhengzhou:Yellow River Engineering Consulting Co.,Ltd.,2011.