担水沟断裂带显微构造特征及其变形环境探讨

Discussion on Microstructure Features and Deformation Environment of Danshuigou Fractured Zone

为合理布置担水沟断裂带围边煤矿采掘工程,保证矿井安全生产,对构造岩和构造煤显微构造分析,探讨了担水沟断裂带显微构造发育特征及变形环境,并以此研究担水沟断裂带的区域构造应力场演化。研究表明:研究区主要以脆性显微构造发育为主,表现有EW、SN、NW-SE、NE-SW向的张裂隙,反映了一种张性应力-应变环境,同时岩组分析14块样品中有11块出现单斜对称,且近EW向极密对称方向的最大极密值达到8.44%,作用强烈;表明受到4个期次的构造应力场作用,分别为NW-SE向挤压、近SN向拉张、近SN挤压、NW-SE向拉张作用,但以燕山晚期的近EW向挤压应力、SN向拉张作用为主,对煤层赋存状态具有较为强烈的改造和控制作用。

In order to rationally arrange the mining and excavation engineering around Danshuigou fractured zone and to ensure the mine safetyproduction, the paper analyzed the microstruetures of the structure rock and structure coal, discussed the development features and deformation environment of the microstructure in Danshuigou fractured zone and studied the regional structure stress field evolution of Dan- shuigou fractured zone. The study showed that the study area was mainly the development of the fragility microstructure with EW, SN, NW-SE, NE-SW directional tension, which could reflect a tensional stress-strain environment. Meanwhile, ll samples of the 14 sam- ples in the rock group were monoclinic symmetry and ultra density near EW direction. The max ultra density value in symmetry reached at 8.44% with serous function. The study showed that affected by the four periodical structure stress fields, a NW-SE extrusion, a SN ten- sion, near SN extrusion and a NW-SE tension function. The near EW extrusion stress and SN tension function of the Late Yanshanian Pe- riod mainly would have serious reconstruction and control role to the seam deposit status.