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针对采空区复杂条件,依托实体工程,利用反映实际问题的二维有限元数值分析方法,运用非线性弹塑性有限元技术,分析煤层按不同开采顺序及回采率开采对路基变形破坏的规律,为寻找防治路基出现不连续变形、沉陷,确定合理设计提供技术依据。研究表明:煤层按不同顺序开采对路基的影响是不同的。开采顺序选择不当,则对路基的危害较大;反之,改变各矿层各工作面的先后开采顺序也可以达到协调开采的目的,变形可抵消一部分。随着回采率的增加,路基竖向位移随之递增,且增加速率较快;最大水平变形也随之迅速增长;下沉盆地的范围随着开采宽度的增加而不断扩大。
Aiming at the complicated conditions of goaf and relying on solid engineering, the nonlinear elastic-plastic finite element method is used to analyze the law of deformation and destruction of subgrade under different mining sequence and recovery rate by using two-dimensional finite element numerical analysis method which reflects practical problems. In order to find the prevention and treatment of roadbed discontinuous deformation, subsidence, to determine the reasonable design provides the technical basis. The research shows that the influence of coal seam mining in different order on subgrade is different. If the mining sequence is not properly selected, the damage to the subgrade will be greater; on the contrary, changing the order of the mining faces of each seam can also achieve the purpose of coordinated mining, and the deformation can offset part of it. As the recovery rate increases, the vertical displacement of subgrade increases with the increase rate rapidly. The maximum horizontal deformation also increases rapidly. The range of the subsidence basin expands with the increase of mining width.