弓长岭井下矿地应力现场实测及应用

为掌握弓长岭井下矿的地应力赋存状态,采用实现完全温度补偿并考虑岩体非线性的地应力测量技术,对弓长岭井下矿3个水平3个测点进行了地应力现场实测,利用Lab VIEW编制的地应力计算程序对测量结果进行分析。3个测点的地应力赋存状态:(1)每个测点均有2个主应力接近水平方向,另1个主应力接近垂直方向;(2)3个测点的最大主应力均为最大水平主应力,垂直主应力为最小主应力,说明矿区地应力场以水平构造应力为主导;(3)3个测点最大水平主应力的走向总体上为南东东—北西西方向;(4)最大水平主应力、最小水平主应力和垂直主应力均随深度呈增长关系。地应力测量结果在弓长岭井下矿的应用主要有3个方面:(1)巷道走向应根据矿山的工程地质条件和采矿生产作业的要求,尽可能与最大主应力方向一致(113.96°);(2)提供数值分析必需的力学边界条件;(3)为弓长岭井下矿预测岩爆发生的地点和级别提供了可能。

In-situ Stress Measurement and Its Application in Gongchangling Underground Mine

In order to obtain the distribution regularities of in-situ stress in Gongchangling Underground Mine,measure-ments by complete temperature compensation technique and improved hollow inclusion strain devices are carried out at the 3 points of 3 levels. By uing the calculation program in LabVIEW codes,in-situ stress states at these 3 points are analyzed. The results show that:① for each measured points,there are two principle stresses equaling to the horizontal direction and another one is close to the vertical direction;②the maximum principle stresses are all the maximum horizontal principle stress,the ver-tical principle stresses are the minimum ones,which indicated that the in-situ stress in Gongchangling Underground Mine is dominated by horizontal tectonic stress field rather than the gravity stress field;③the maximum horizontal principal stress is o-riented in SEE-NWW direction;④the maximum horizontal principal stress,the minor horizontal principal stress and the vertical principal stress are almost increased with depth. Applications results of the obtained distribution regularities of in-situ stress are as follows:①in order to satisfy the requirements of engineering geological condition and mining production,tunnel should be arranged close to the direction of the maximum principle stress,which is 113. 96° in Gongchangling Underground Mine;②me-chanical boundary conditions are provided by the numerical simulation results in this paper;③the location and intensity of the unexpected rockburst can be predicted effectively.