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为研究地堑和地垒构造对采煤沉陷的影响,建立了仅地质构造形式不同即地堑和地垒,而含煤岩系地层结构及其力学性质完全相同的两个采煤沉陷模型,然后采用东北大学岩石破裂与失稳分析系统RFPA对这两个模型分别进行开采条件相同的数值模拟试验.试验结果表明:在相同的开采强度下,地堑构造形式下的地表下沉幅度小,形成连续的弯曲下沉,但下沉盆地范围较大,采煤沉陷相对较弱,因此,地堑构造具有较强的抗扰动能力;地垒构造形式下的地表下沉幅度较大,易于形成不连续变形如槽型塌陷等,而下沉盆地范围较小,开采时较容易引起地表环境的损害,因此,地垒构造抗扰动能力较弱.
In order to study the influence of grabens and basement structures on coal mining subsidence, two coal mining subsidence models with different geological structures, ie, graben and horst, were established and the strata structure and mechanical properties of coal-bearing rock series were identical. Then the numerical simulation experiment of the same mining conditions was carried out by using the rock burst and instability analysis system of Northeastern University RFPA.The results show that under the same mining intensity the surface subsidence amplitude under the graben structure is small, Forming continuous bending subsidence, but the scope of the subsidence basin is relatively large and the coal mining subsidence is relatively weak. Therefore, the graben structure has strong anti-disturbance ability; the surface subsidence under the basement structure form is large and easy to form Discontinuous deformation, such as trough collapse, etc., while the scope of the subsidence basin is relatively small, which is more likely to cause damage to the surface and environment during mining. Therefore, the anti-disturbance structure of the basement is weak.