基于完整钻孔柱状数值模拟的岩层移动角求取

在矿山开采沉陷的计算中,通常采用经验法来确定岩层移动的角值参数。但在我国西部的一些新建矿区,由于地表观测资料积累较少或缺乏临近的煤田作为类比,应用经验法会有明显的缺陷,如何合理地确定岩层移动角就存在着困难。数值模拟法只要利用前期地质勘探的钻孔数据求取移动角,而无需地表移动变形的观测资料,可以作为解决该问题的有效方法。但现有的研究普遍基于地层简化结果建模,这势必引起一定的误差。为研究基于完整钻孔柱状结果的数值模拟求取岩层移动角的可靠性,分别基于地层全柱状结果和简化结果建立了FLAC3D模型,经过对比分析,得出基于全柱状结果的FLAC3D模型计算结果与矿区后期实测的角值符合更好,指出了基于完整柱状建模求取岩层移动角是更加合理和准确的。

Determination of Strata Displacement Angle Based on Numerical Simulation of Complete Borehole Column

In the calculation of mining subsidence， empirical methods are usually used to determine the displacement angle of strata. However， in some newly-built mining areas in western China， due to the lack of accumulation of surface observation data or the lack of adjacent coal fields as an analogy， the application of empirical methods has obvious defects. It is difficult to rationally determine the displacement angle of strata . As long as the numerical simulation method uses the drilling data of the previous geological exploration to obtain the displacement angle， and does not need the observation data of the surface movement deformation， it can be used as an effective method to solve the problem. However， existing research is generally based on modeling results of stratigraphic simplification， which is bound to cause certain errors. In order to study the reliability of the rock movement angle based on the numerical simulation of the complete borehole column results， the FLAC3D model was established according to the full column results and simplified results. After comparative analysis， it is concluded that the calculation results of the FLAC3D model based on the full column results are in good agreement with the measured angular values in the later part of the mining area. It is pointed out that it is more reasonable and accurate to obtain the rock movement angle based on the complete column modeling.