摘要
金波石料场顺层中倾角结构面发育,前期方案试算整体工程边坡开挖后稳定性差,根据刚体极限平衡法得出金波石料场滑面倾角α和临界等效岩层厚度h的关系以及坡面倾角β和临界坡高H的关系。并通过对比2种避让方案,确定最终的拟定方案。结果显示,方案一通过转角来调整开挖坡面与不利结构面的空间交切关系来提高边坡的稳定性,但其需要重新削坡揭顶,供料时间与大坝浇筑时间冲突;方案二采用中间留岩柱的方式,但设计底高程开采时间与蓄水时间冲突。最终采用上游侧保留中低高程岩体,并拓展下游侧开挖面,较好地避免了更多顺坡中倾角结构面的揭露。
For the development of structural plane of bedding dip angle of Jinbo quarry,the stability is poor after excavation of slope of the overall engineering in preliminary scheme.According to the limit equilibrium method for rigid block,the relationship between the dip angle α of sliding surface and critical equivalent rock thickness h and the relationship between the dip angle β of slope and critical slope height H are obtained.The final scheme is prepared by comparing two avoidance schemes.The results show that the Scheme 1 adjusts the spatial intersecting relationship between excavation slope and unfavorable structural plane to improve the stability of the slope,but it needs to re-cut the slope and lift the roof,and the feeding time conflicts with the pouring time of the dam;while Scheme 2 uses the method of retaining rock pillars in the middle,but the mining time conflicts with the water storage time in the designed elevation.Finally,it is suggested to retain the middle and low elevation rock mass at the upper side,and expand the excavation face at the lower side,so as to avoid the exposure of structural plane of dip angle in bedding slope.
作者
张洋
沈俊良
周勇
ZHANG Yang;SHEN Junliang;ZHOU Yong(PowerChina Huadong Engineering Corporation Limited,Hangzhou 310014,China;HydroChina Itasca R&D Center,Hangzhou 310014,China)
出处
《人民珠江》
2019年第12期31-36,共6页
Pearl River
基金
国家自然科学基金(U1865203)
关键词
顺层
中倾角
边坡
岩质
bedding
dip angle
slope
rock
