海孜煤矿构造变形及其对煤厚变化的控制作用

分析了海孜煤矿岩、煤层组合特征 ,总结了 7,8,9,1 0煤层的断层、层滑构造和煤厚变化情况 ,探讨了断层与层滑构造的形成机制以及构造变形对煤厚的控制作用 .结果表明 :7,8,9,1 0煤层等软弱层属于塑性层 ,而各煤层及顶底板岩层组合及构造变形又有较大区别 .在多期构造应力场作用下 ,7,8,9煤层以层滑构造发育为主 ,形成煤层急剧增厚变薄带 ,并见压剪和张剪性两种层间断层 ;1 0煤层以中小型剪切式断层为主 ,层滑构造发育程度次之 ,煤厚变化幅度较小 .断层和层滑构造又存在密不可分的组合关系

Tectonic Deformation and its Control over Thickness of Coal Seams in Haizi Coal Mine

Assemblage features of rocks and coal seams in Haizi Coal Mine were analyzed. Changes of faults, layer slip, and thickness of coal seams No.7,8,9,and 10 were summarized. Mechanism of forming faults and layer slip structure and the control of structural deformation over the thickness of coal seams were discussed. The result shows that although the weak layers such as coal seams No. 7,8,9,and 10 are plastic ones, they differs in assemblages of roof and floor and in structural deformation. Influenced by the multi phase tectonic stress fields, coal seams No. 7,8, and 9 are dominated by layer slip structures, forming sharply thickening and thinning zones and displaying inter layer faults of both compressive shear and tensional properties; While coal seam No. 10 is dominated by small to middle faults of shear property with a little development of layer slip structure and a little change of thickness of coal seam. This shows a close relationship between faults and layer slip structures.