摘要
地下水封洞库工程是我国正在大力实施的战略石油储备重点工程,研究建库裂隙岩体的连通性是评价水封效果的关键。结合地下水封洞库工程的岩体特征,以钻孔电视成像技术为手段,通过分析影像中结构面位置、地质特征等,建立不同钻孔间结构面连通的条件,并分析了钻孔ZK11和ZK12,ZK12和ZK14的变质分异结构面的几何连通性;以洞库区钻孔地下水位的陡降与施工巷道开挖的相关关系,建立了巷道地下水排泄与钻孔水位下降的水力联系,分析了结构面的水力连通性;通过几何连通和水力连通的综合分析,确定了深部岩体结构面的连通性。研究结果表明,施工巷道开挖引起钻孔地下水位的显著下降,两者存在明显水力联系;变质分异结构面(J)在钻孔ZK12、ZK11和①号施工巷道0+379.424m处满足位置连通、结构面特征连通和水力连通,为连通性结构面;结构面(J′)在钻孔ZK12和ZK14处满足位置连通和结构面特征连通,不满足水力连通,为非连通性结构面。这对地下工程深部岩体结构面连通性的研究具有参考和借鉴价值。
Water sealed underground storage cavern is the key project of strategic petroleum storage which is ongoing in China. The connectivity of fractured rock mass is the critical issue of oil containment evalua- tion. Combination of rock mass characteristics of the underground storage cavern, the location and geolog- ical characteristics of discontinuities were analyzed by the Borehole Television （BHTV） image. The con- nective conditions among different boreholes were established. And the geometry connectivity of metamor- phic discontinuities was researched between borehole of ZK11 and ZK12, ZK12 and ZK14. After the rela- tionship of groundwater dropped steeply in boreholes and construction tunnels excavation analyzed, the hy- draulic contact of groundwater discharge in tunnels and decline in boreholes was established. And the hy- draulic connectivity of the discontinuities was studied. By the comprehensive analysis of the geometry and hydraulic connectivity, the discontinuities connectivity of deep rock mass was determined. The results show that the excavation of construction tunnels caused the groundwater declining significantly, and the hydraulic connection was obvious. The metamorphic discontinuity, J, is satisfied the location, geological feature and hydraulic connectivity in borehole of ZK12, ZKll and 0＋379. 424 m of the construction tunnel of NO. 1, which is the connective discontinuity. However, the discontinuity, J＇, is satisfied the location and geological feature, but not fit the hydraulic connectivity in borehole of ZK12 and ZK14...And that is non-connective discontinuity. It has reference value to discontinuities connectivity of deep rock mass in un- derground engineering projects.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第1期176-180,共5页
Geological Science and Technology Information
基金
北京市科学技术委员会重点资助项目(20090102-2796)
关键词
结构面
连通性
电视成像
水位监测
地下水封洞库
discontinuity
derground storage cavernconnectivity
borehole television image
groundwater monitoring
water sealed un
