常村矿巨厚砾岩下特厚煤层开采对地表形变的影响分析

An analysis of extra-thick coal mining influence on ground surface deformation under the condition of massive conglomerate stratum in Changcun colliery

为了研究巨厚砾岩下特厚煤层开采地表形变规律,以概率积分模型为原型,建立了基于叠加原理的三维空间分布式优化求参模型。以常村煤矿2113工作面地表移动观测站实测资料为依据,采用下沉和水平移动求参模型求取了地表形变预计参数。结合工程地质资料,从岩层运移机理对参数的分布规律进行了分析。结果表明,巨厚砾岩关键层的初次破断距为367 m,悬臂梁周期破断距为179 m,关键层破断后地表非连续变形显现强烈,巨厚砾岩层的悬臂支承作用是造成地表沉陷盆地出现偏态下沉的根本原因,与实测结果相吻合。

In order to research ground surface deformation law of extra-thick coal mining under the condition of massive conglomerate stratum, according to probability integral model, 3D distributed mathematical functions to determine optimum parameters have been made based on superposition principle. In response to ground surface movement surveying datum of 2113 panel of Changcun colliery, surface deformation prediction parameters have been obtained by using subsidence and horizontal movement functions. Associated with engineering geological data, parameters distribution law has been analyzed from overburden terrane movement mechanism. The results show that first weighing interval of thick conglomerate is 367 m, while period weighing interval of cantilever is 179 m. Ground surface discrete deformation present intensively after key-strata collapses. And the cantilever bear action of massive conglomerate stratum mainly causes dissymmetry subsidence basin. The results are in accord-ance with field surveying datum.