不同土岩比地表沉陷特征数值模拟分析

Numerical Simulation and Analysis of Surface Subsidence Characteristics with Different Soil-Rock Ratios

为了探讨土岩比变化较大情况下地表移动变形规律,本文结合某真实矿区岩层状况,建立不同土岩比组合情况下的数值模型,并对其进行模拟分析,得到了不同土岩比条件下地表移动变形规律.随着松散层厚度的增加地表最大下沉与位移值先成对数增长,当达到巨厚松散层厚度后该值成线性趋势,并趋于稳定.随岩层厚度的增加,地表的沉降和位移在不断减小,沉降区域逐渐平缓,当岩层厚度达到某一数值时,地表位移与沉降数值会发生小幅度的上涨说明了岩层中阻止松散层沉降的控制层在整个沉降过程中的重要作用.该规律为土岩比变化较大的矿区的沉陷预计提供参考依据.

In order to study the law of surface movement and deformation under the condition of large variation of soil-rock ratio, the numerical model under different combination of soil-rock ratio is established and simulated. The law of surface movement and deformation under different soil-rock ratio is obtained. The maximum subsidence and displacement of the surface increase logarithmically with the increase of the thickness of the loose layer. When the thickness of the huge loose layer is reached, the maximum subsidence increases linearly and tends to be stable.With the increase of stratum thickness, the settlement and displacement of the surface are decreasing, and the settlement area is gradually flat. When the stratum thickness reaches a certain value, the surface displacement and settlement value will rise slightly, which shows that the control layer of preventing the settlement of loose stratum plays an important role in the whole settlement process. This rule provides a reference for the prediction of subsidence in mining areas with large variation of soil-rock ratio.