车集矿深部三维初始地应力测量研究

3D initial ground stress measurement at deep position of Juji Mine

岩体的初始地应力是地壳地层力学状态最基础的原始数据,是采矿工程围岩稳定性分析、开采与支护设计的一个基本参数。与其它地应力测量方法相比,空心包体应力解除法测量精度高且能一次测得三维应力,论述了其地应力测量原理,并采用改进的KX-81型空心包体式应力计实测了车集矿区深部4个测点的三维地应力大小和方向。通过结果分析获得车集矿地应力场的基本分布规律如下:各个主应力均为压应力,没有出现拉应力的现象,最大主应力倾角均小于6°,方位角介于SE10°—SW11°,为近水平南北方向,说明车集矿区域地应力以水平构造应力为主,根据应力回归公式可知,垂直应力基本上等于或略小于单位面积上覆盖岩层的重量,最大主应力随深度的增加而增加。测量结果对深部采矿设计和安全生产具有重要的指导意义。

The initial ground stress of rock mass is the most basic and original data of the mechanical state of crustal formation.It is a fundamental parameter for the stability analysis of surrounding rock and the design of mining and supporting in mining engineering.Compared with other methods of in-situ stress measurement,the stress relief method of hollow inclusion is more accurate and can get 3D stresses by one-time measurement.The theory of in-situ stress measurement by use of hollow inclusion gauge is discussed in detail.The magnitudes and directions of 3D ground stress at four deep sites in Juji Mine are obtained by means of improved（KX-81） hollow inclusion gauge.Through analysis,the basic rules of the in-situ stress distribution in Juji Mine are as follows： each of the principal stresses is compression stress,and no tensile tress is found;the dip angles of the maximum principal stress are all less than 6o,and their orientation angles range from S10oE to S11oW,that is,the maximum principal stress is close to the horizontal and north-south direction,which shows that the regional geo-stress field of Juji Mine is mainly composed of horizontal tectonic stress;stress regression equations indicate that the vertical stress is not more than the weight of top strata in unit area,and that the values of the principal stresses increase with the increase of depth.The measured results are of great importance to the design of deep mining and the security of production.