摘要
以华北平原某深部资源勘探工程为背景,根据井工设施、开采及地面工业场地设计要求,在断层附近不同位置布置勘测钻孔,进行超千米深部岩体水压致裂法地应力测量,通过对断层附近6个钻孔的试验与分析,揭示断层附近地应力场的分异特性及其变化规律。研究表明,断层附近的最大水平主应力σH∈[26.35MPa,55.47MPa],应力集中系数为1.05?1.44;σH/σh∈[1.22,1.65],平均为1.56,σH/σh比值与远场应力的相当;σH/σh∈[5.90,22.80],平均为16.42,高于远场应力的差值。在断层附近应力方向将发生偏转,范围为0.60°?30.83°,平均偏转24.2°。地应力在断层之间、断层的交汇处及断层下盘发生显著的变化,表现为应力集中、水平主应力差值增大、方向重大偏转及百米地应力增量增大,且位置不同,地应力存在明显的分异性。
Based on a deep resource exploration project in the Plain of North China,six boreholes are arranged atvarious positions near the faults according to the requirements of mine facilities,mining and ground industrial sitesdesign,and hydraulic fracturing technique is implemented for measurement of in-situ stress.By comparisons ofstresses between near and far to the faults,the variability of in-situ stress near the faults and its change rule isrevealed.The results have shown that the maximum horizontal principal stressσH∈[26.35 MPa,55.47 MPa],stress concentration factor is 1.05-1.44;σH/σh∈[1.22,1.65],1.56 in average,which is approximately equivalentto that of far field stress;σH/σh∈[5.90,22.80],16.42 in average,exceeding the differential value far to the faults.In the adjacent zone,the orientation of in-situ stress near to the faults will diverse,the variation range of diversionis 0.60°-30.83°,24.2°in average.In-situ stress will evidently change at the lower wall of fault,between the faults,and at the junctions,it presents stress concentration,increase in differential value between horizontal principalstresses,significantly diversion in the orientation of stress and increase in stress increment per hundred meters atvertical depth.It shows significant difference with the change of measuring position.
作者
谭卓英
夏志远
丁宇
Roland Againglo
刘焕新
岳鹏君
TAN Zhuoying;XIA Zhiyuan;DING Yu;Roland Againglo;LIU Huanxin;YUE Pengjun(State Key Laboratory of High-efficient Mining and Safety of Metal Mine,Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第S02期3330-3337,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51574015,51174013)
国家重点研发计划(2018YFC0808004-01)。
关键词
岩石力学
深部岩体
地应力
断层
分异性
分布规律
rock mechanics
rock mass at great depth
in-situ stress
fault
differentiation
distributingdisciplinarian
