摘要
地应力是漫长地质时期形成的岩体内生应力,成因复杂、影响因素众多,是影响深井巷道围岩稳定性的重要因素之一。应用空心包体式三轴应变计,采用钻孔应力解除法系统地对霍州矿区现有主采煤层进行地应力现场实测,得到不同位置和埋深的实测地应力数据。通过对实测数据的系统分析,得出矿区范围内地应力场的分布规律,验证霍州矿区地壳浅部地应力场仍以水平应力为主。基于地应力实测数据和具体工程地质条件,采用FLAC3D对不同轴向煤矿巷道进行围岩稳定性数值分析。应用上述研究成果,对团柏矿八采区巷道顶板稳定性受最大水平地应力的影响程度进行分析。研究结果为霍州矿区采场合理布置及煤矿巷道支护设计强度提供计算参数,对于井巷布置和矿山安全高效生产具有重要指导意义。
In-situ stress is formed in rock mass with complex origin and experienced a prolonged geological period, and there are many influencing factors. And in-situ stress is one of the important influencing factors to the deep laneway rock stability in coal mines. The field measurement is systematically carried out by boring stress-relief method with hollow inclusion triaxial strain gauge in primary mineable coal bed of Huozhou mining area and actual survey ground stress data at different positions and depths are achieved. Distribution law of in-situ stress field is obtained by systematically analyzing testing data. It shows that crust of earth in Huozhou mining area is effected by horizontal tectonic stress field. By using FLAC3D program, the model is established to analyze the laneway stability of different orientations based on in-situ stresses and detailed engineering geological condition. Using obtained research results and the maximum horizontal stress theory to study working area of Tuanbai coal mine No.8, the coal roadway roof stability performance is mostly effected by the maximum horizontal stress. The result is helpful to determine mining stope tendency and to choose the calculation parameters of coal roadway supporting design strength. The conclusion has important significance for the safety and high effective product in coal mines.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第A01期2768-2774,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(50874103)
国家重点基础研究发展计划(973)项目(2006CB202210
2010CB226805)
江苏省自然科学基金资助项目(BK2008135)
关键词
采矿工程
煤矿
地应力
空心包体应变计
分布规律
数值分析
mining engineering
coal mine
geostress
hollow inclusion strain cells
distributing law
numericalanalysis
