徐州矿区深部地应力测量及区域构造作用分析  

In-situ stress measurements and analysis of action of geological structures of deep coal mines in Xuzhou

作　　者：张国锋[1,2] 朱伟[2] 赵培[1,2] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《岩土工程学报》2012年第12期2318-2324,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2006CB202200)

摘　　要：为了指导徐州矿区深部巷道维护及开采安全,在5个埋深超过800 m的深井采用空心包体三维应力解除法进行了原岩地应力测量。实测数据表明:所有测点的最大水平主应力均略大于垂直主应力,方向呈NW-SE向,近水平方向;由于受区域地质构造作用,地应力存在东西差异,西部和西北部矿井,近似呈静水压力型,东部矿井水平应力是垂向应力的1.19～1.23倍;分析了深井地应力量级、主应力与侧向系数随深度的分布规律;分析了区域郯—庐大断裂左旋平移的基础上形成的北东向徐—宿弧形推覆构造作用影响,确立了矿区实测地应力场与区域地质构造的一致性关系,为深部开采提供可靠的地应力基础数据。In order to ensure the safety of tunnel maintenance and mining operation of coal mines in Xuzhou, in-situ rock stresses are measured in 5 coal mines of Xuzhou mining area at a depth of over 800 m by means of the boring stress-relief method with hollow inclusion triaxial strain gauge. The stress measurement data indicate that the maximum horizontal principal stress at all measureing points are little greater than the vertical principal stress. The direction of the maximum principal stress is almost NW-SE nearly horizontal. The in-situ stress values have differences between the eastern and western areas because of geological structures. The stress in western and north-western areas shows the characteristics of hydrostatic-pressure, while the ratios of the maximum horizontal principal stresses to the vertical principal stress are 1.19 ~ 1.23 in the eastern minining areas. The variation of stress magnitude, and the stress and coeficient of horizontal pressure with buried depth is analyzed. The action of Xuzhou-Suxian nappe structure in NE direction induced by left traverse transition of Yan-Lu major dislocation is analyzed. The distribution laws of in-situ stress field obtained by the practical measurement show good agreement with the regional tectonic stress field. The results may provide reliable basic stress data for deep mining.

关 键 词：徐州矿区 煤矿开采 深部 地应力 空心包体应变计 地质构造 分布规律 

分 类 号：TU47[建筑科学—结构工程]