渭北煤田多因素影响下底板扰动破坏深度研究

Fitting analysis and verification of floor disturbance failure depth under the influence of multiple factors in Weibei coalfield

针对常用的底板扰动破坏深度计算公式在渭北煤田澄合矿区适用性较差的问题,结合澄合矿区5#煤层顶底板工程地质、水文地质条件,分别对不同采宽-采深和采宽-采深-采高条件下的底板扰动破坏深度进行了数值计算分析。根据数值模拟结果,分析得到了适用于澄合矿区的底板岩体扰动破坏深度拟合公式,并与华北型煤田26组近水平煤层开采工作面底板破坏深度实测值进行对比分析。结果表明:所提出的拟合公式预测能力更强、预测精度更高,误差范围更小,可满足澄合矿区现场需要,为带压安全开采提供了评价依据和科学指导。

In view of the poor applicability of the commonly used calculation formula of floor disturbance failure depth in Chenghe mining area,in this paper,combining with the engineering geological and hydrogeological conditions of the roof and floor of No. 5 coal seam in the mining area,numerical calculation and analysis are carried out on the floor disturbance failure depth under the conditions of two-factor and multifactor respectively. Based on the results of numerical simulation,the fitting formulas for the floor failure depth in Chenghe mining area are obtained. And the results are compared with the measured values of floor failure depth of the 26 coal seams in North China type coalfield. The results show that the nonlinear fitting regression formula proposed in this paper has stronger prediction ability,higher prediction accuracy and smaller error range,which can meet the field needs of Chenghe mining area,and provide evaluation basis and scientific guidance for mining under pressure.