基于正交试验的底板破坏深度主控因素敏感性分析

发布时间：2018-05-20 11:43

本文选题：正交试验 + 底板破坏深度　；参考：《煤炭学报》2015年09期

【摘要】：为了研究底板破坏深度的影响因素,考虑工作面倾斜长度、采厚、采深、不同底板岩层力学参数和承压水水压,采用FLAC3D软件模拟底板破坏深度,运用正交试验法对模拟结果分析,研究影响底板破坏深度主控因素敏感性。研究结果表明,工作面斜长、采深、采厚对底板破坏深度的敏感性主次顺序为工作面斜长采深采厚;抗拉强度对底板拉破坏深度的影响为高度显著;底板岩层黏聚力、内摩擦角对底板破坏深度及拉破坏深度的敏感性不显著;抗拉强度、内摩擦角对剪破坏深度的敏感性较弱,黏聚力对底板剪破坏深度具有显著性影响;随着承压水压力的增加,底板中水平最小主应力与承压水压力越来越接近,且水平应力值接近水压的岩层范围增大,导致突水的危险性增加。
[Abstract]:In order to study the influence factors of floor failure depth, considering the inclined length of working face, mining thickness, mining depth, mechanical parameters of different floor rock strata and pressure water pressure, the failure depth of bottom slab is simulated by FLAC3D software. The sensitivity of the main control factors affecting the failure depth of the floor plate was studied by using the orthogonal test method to analyze the simulation results. The results show that the sensitivity of mining thickness to the depth of floor failure is in the order of inclined length, mining depth and thickness, the influence of tensile strength on the depth of floor tensile failure is significant, and the cohesive force of bottom rock layer is the main order of the sensitivity of mining thickness to the depth of floor failure, and the influence of tensile strength on the depth of floor tensile failure is significant. The sensitivity of internal friction angle to the failure depth and tensile failure depth of bottom plate is not significant, the sensitivity of tensile strength and internal friction angle to shear failure depth is weak, the cohesion force has significant influence on the shear failure depth of bottom plate, and with the increase of confined water pressure, the internal friction angle has a significant effect on the shear failure depth of bottom plate. The minimum horizontal principal stress is more and more close to the pressure of confined water in the bottom plate, and the range of rock strata in which the horizontal stress value is close to the water pressure increases, which leads to the increase of the risk of water inrush.
【作者单位】：山东科技大学矿业与安全工程学院;
【基金】：国家自然科学基金资助项目(51274135);国家自然科学基金重点资助项目(51034003);国家自然科学基金海外合作资助项目(51428401)
【分类号】：TD745

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