玲珑金矿深部地应力测量及矿区地应力场分布规律

 介绍玲珑金矿主矿区深部和浅部两期地应力测量的过程和结果。为提高测量结果的可靠性和准确性，采用完全温度补偿技术和实现完全温度补偿的空心包体应变计等一系列新的技术和方法，对传统的应力解除法进行重大改进。通过实测，获得矿区7个水平，18个测点的三维地应力大小和方向。根据实测结果，对玲珑金矿主矿区地应力场的分布规律进行定量的综合分析与研究。研究结果表明：(1) 玲珑金矿主矿区地应力场以水平构造应力为主导，最大水平主应力平均为自重应力的2.26倍；(2) 最大水平主应力的走向为NW向，基本与区域构造应力场最大主应力的方向相一致；(3) 垂直主应力值基本上等于或略大于自重应力值；(4) 深部与浅部相比，尽管岩性有较明显变化，但地应力场分布规律并没有显著改变；(5) 最大水平主应力、最小水平主应力和垂直主应力值均随深度呈几乎线性增长关系。

IN-SITU STRESS MEASUREMENT AT DEEP POSITION OF LINGLONG GOLD MINE AND DISTRIBUTION LAW OF IN-SITU STRESS FIELD IN MINE AREA

To ensure mining safety,in-situ stress measurement in Linglong gold mine is carried out in two periods. The first period measurement is performed in the shallow position and the second period measurement is performed in the deep position. The measurement process and results are introduced. In order to increase reliability and accuracy of the measurement,a series of new techniques including complete temperature compensation technique and improved hollow inclusion strain devices are used in the measurement. Through in-situ measurement,3D geostresses at 18 points,which are distributed in 7 levels,are determined. Based on the measuring results,comprehensive study of distributing law of the in-situ stress field in the mine is completed. Some conclusions are drawn as fallows:(1) The in-situ stress in Linglong gold mine is dominated by horizontal tectonic stress field rather than the gravity stress field. The magnitude ratio of maximum horizontal principal stress to gravity stress in the mine is 2.26 in average. (2) The maximum horizontal principal stress is oriented in NW direction which is approximately coincided with the orientation of the maximum principal stress of tectonic stress field. (3) The vertical principal stress is basically equal to or a little larger than the gravity. (4) Despite the rock nature in deep position is changed;and the distribution law of in-situ stress state is not remarkably changed in deep position compared with that in shallow position. (5) The maximum horizontal principal stress,minor horizontal principal stress and vertical principal stress are almost linearly increased with depth.