厚松散层浅部开采地表移动规律数值模拟研究

On the Numerical Simulation of Laws of Surface Movement in Mining Superficial Part of Thick Unconsolidated Formation

为研究厚松散层浅部开采时地表移动特殊规律,采用FLAC3D数值模拟软件,分别建立了厚松散层浅部开采数值模型,得出了相应回归分析函数关系。研究表明:厚松散层浅部开采地表下沉系数随基岩层厚度占采深比例及采厚和基岩层厚度之比呈线性关系;在基岩层相对较薄的区域,松散层土体受开采影响产生原位扰动压缩,是导致地表下沉异常的主要原因。

To study the special laws of surface movement in mining superficial part of thick unconsolidated formation, establishes the numerical model of mining superficial part of thick unconsolidated formation and draws the corresponding regression analysis functional relation by using FLAC3D numerical simulation software. The study has shown that： surface subsidence coefficient in mining superficial part of thick unconsolidated formation of linear relation with the proportion of bedrock layer thickness in mining depth and the ratio of mining thickness to bedrock layer thickness, and in the area of relatively thinner bedrock layer, in situ . disturbance compression of soil mass of unconsolidated formation affected by mining is the main reason leading to abnormal surface subsidence.