断层赋存条件下工作面覆岩位移场可视化研究

VISUALIZATION STUDY ON DISPLACEMENT EVOLUTION OF OVERLYING ROCK STRATA UNDER EXISTENCE OF FAULT STRUCTURE

  • 摘要: 断层构造赋存条件下采煤工作面覆岩变形破坏是诱发煤矿冲击地压的主要因素,揭示构造应力作用下工作面覆岩位移场演化特征具有重要的理论意义和工程指导价值。该文对线性插值、最近邻插值、双三次插值、反距离权重插值及克里金插值五种插值算法进行选优分析,将信息熵加权回归法与变异函数高斯模型相融合,提升了克里金插值算法的准确度和空间完整性,并融合弹性理论边值问题处理方法,形成了用于工作面覆岩三维位移场可视化计算的修正克里金插值算法。该文以内蒙古鄂尔多斯市东胜矿区马泰壕煤矿典型工作面为工程地质背景,通过实验室物理相似试验,模拟了断层赋存条件下工作面上覆岩层变形、运移和垮落全过程,采用数字相关法监测并计算了覆岩表面位移场动态演化特征,并作为工作面覆岩三维位移场边界条件,结合模型内部应变场监测数据,采用覆岩三维位移场可视化插值算法,获得了断层赋存条件下工作面覆岩三维位移场动态演化特征。

     

    Abstract: The deformation and failure of overlying rock strata under the condition of fault structure are the main factors inducing coal bursts in coal mines. It is of a great theoretical significance and engineering guiding value to reveal the evolution characteristics of overlying rock strata displacement field under the tectonic stress. In this study, five interpolation algorithms, including linear interpolation, nearest neighbor interpolation, bicubic interpolation, inverse distance weight interpolation and, Kriging interpolation are selected to conduct an optimization analysis. The information entropy weighted regression method is integrated with the variogram Gaussian model to improve the accuracy and spatial integrity of Kriging interpolation algorithm and, then by companying the elasticity boundary theory, to form a modified Kriging interpolation algorithm for the visualization calculation of three-dimensional (3D) displacement of overlying rock strata around the coal mining face. Taking the typical mining face of Mataihao coal mine in Ordos City1 of Inner Mongolia in China as the engineering geological background, the deformation, movement and, caving process of overlying rock strata under the condition of fault occurrence is simulated through physical experiments. The dynamic evolution characteristics of the overlying rock strata displacement are obtained by using the 3D overlying rock visual interpolation algorithm.

     

/

返回文章
返回