摘要
采用小孔径水压致裂地应力测量装置,在典型的急倾斜、特厚煤层矿区——甘肃华亭矿区的大型向斜构造附近进行14个测站地应力测量,以分析向斜构造不同部位的地应力变化。实测数据表明:华亭煤矿、砚北煤矿井下构造应力占绝对优势;在向斜翼部,水平应力较小;在向斜轴部,水平应力急剧增加,增加幅度远大于垂直应力;向斜构造对矿区地应力分布产生严重影响。基于山西晋城矿区的地应力实测数据,分析断层对地应力值与方向的影响。断层附近某些区域水平应力有所减小,大型断层会引起最大水平主应力方向的扭转。在实测数据基础上,采用FLAC3D数值计算软件,分析华亭矿区大型向斜构造周围地应力场分布,并与地应力实测数据进行对比。将地应力实测与数值模拟有机结合,是全面了解煤矿井下地应力场分布特征的有效途径。
Using the hydraulic fracturing in-situ stress testing rig with small boreholes, stress measurements were carried out at 14 sites near the large syncline structure in the Huating coal mining area, where steep and extremely thick coal seams are typical in China, to analyze the in-situ stress variation in different parts. Measured data point out that the tectonic stress predominates in the Huating coal mine and Yanbei coal mine. Along the wing of the syncline structure, the horizontal stress is comparatively small; however, the horizontal stress near the axis of the syncline structure increases far more quickly than the vertical stress; and the syncline structure greatly influences the stress distribution in the coal mining area. Based on the in-situ stress data measured in the Jincheng coal mining areas in Shanxi Province, the effects of faults on the magnitude and orientation of in-situ stresses were analyzed. Some areas near the faults show the lower horizontal stress than the normal level, and large faults may alter the orientation of the maximum horizontal principal stress. On the basis of measured in-situ stresses, numerical models were built to analyze the stress distribution around the large syncline structure in the Huating coal mining area by means of FLAC3D code, and the numerical results were compared with the measured ones. The combination of in-situ stress measurement and numerical simulation will provide an effective approach to fully understand the characteristics of in-situ stress field in underground coal mines.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第A01期2674-2680,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家高技术研究发展计划(863计划)课题(2008AA062102)
关键词
采矿工程
煤矿井下
地应力测量
地质构造
向斜
断层
数值模拟
应力分布
mining engineering
underground coal mines
in-situ stress measurement
geological structures
syncline~ fault~ numerical simulation~ stress distribution
作者简介
康红普（1965-），男，博士，1985年毕业于山西矿业学院采矿工程系采矿工程专业，现任研究员、博士生导师，主要从事岩石力学与巷道支护技术方面的教学与研究工作。E—mail：kanghp@163．com
