Based on the features of the serious deformation of coal roadway,many random variables of the mechanics of the surrounding rocks and the influence of mining, the reliability analysis model of the support structure of ...Based on the features of the serious deformation of coal roadway,many random variables of the mechanics of the surrounding rocks and the influence of mining, the reliability analysis model of the support structure of coal roadway under the influence of mining is established,and the calculating formulas of reliability of the support structure is obtained with the engineering structure reliability theory. And the reliability is calculated based on the method of Monte Carlo to the coal roadway which is exampled on the influence of mining or not. The relationship between support parameters and reliability, the mining influence coefficients and reliability is established, which provides theory foundations for the design of the coal roadway bolt support.展开更多
The three-dimensional damage constitutive relationship of coal is established and distribution law of the abutment pressure of the integrated coal beside the road-in packing for gob-side entry retaining in fully-mecha...The three-dimensional damage constitutive relationship of coal is established and distribution law of the abutment pressure of the integrated coal beside the road-in packing for gob-side entry retaining in fully-mechanized caving face under the effect of given deformation of the main roof is analyzed by the damage mechanics theory. And the relationship between distribution of the abutment pressure and thickness of coal seam is explored. The presented result is of great theoretical significance and practical value to the study on stability control of the surrounding rock of road-in packing for gob-side entry retaining in fully-mechanized caving face.展开更多
文摘为了得到岩体破裂滑移对巷道围岩(煤柱、煤体及顶板)的影响,以山西潞宁煤矿22117风巷为研究背景,利用微震监测系统对潞宁煤矿22117风巷进行微震监测,得到围岩破裂的微震响应特征并对其进行分析.结合现场实际情况,利用FLAC 3D模拟软件建立三维模型,并进行数值模拟计算,对巷道掘进时顶板稳定性规律进行分析.结果表明:掘进对顶板影响表现为由巷道顶板-煤柱及其上方顶板-煤体及其上方顶板逐渐发展的一个过渡过程;巷道顶板受掘进直接影响的范围为距迎头32.6 m范围内;掘进动力扰动对后方煤柱顶板破裂的微震具有滞后效应,滞后范围约为93.3 m.
基金a grant from the National Natural Science Foundation of China (No. 50674046)a grant from the Scientific Research Fund of Hunan Provincial Education Department(No. 07C293).
文摘Based on the features of the serious deformation of coal roadway,many random variables of the mechanics of the surrounding rocks and the influence of mining, the reliability analysis model of the support structure of coal roadway under the influence of mining is established,and the calculating formulas of reliability of the support structure is obtained with the engineering structure reliability theory. And the reliability is calculated based on the method of Monte Carlo to the coal roadway which is exampled on the influence of mining or not. The relationship between support parameters and reliability, the mining influence coefficients and reliability is established, which provides theory foundations for the design of the coal roadway bolt support.
基金Supported by the National Science Foundation of China (50874042, 50674046)National Science Important Foundation (50634050)Hunan Science Foundation (06JJ50092)
文摘The three-dimensional damage constitutive relationship of coal is established and distribution law of the abutment pressure of the integrated coal beside the road-in packing for gob-side entry retaining in fully-mechanized caving face under the effect of given deformation of the main roof is analyzed by the damage mechanics theory. And the relationship between distribution of the abutment pressure and thickness of coal seam is explored. The presented result is of great theoretical significance and practical value to the study on stability control of the surrounding rock of road-in packing for gob-side entry retaining in fully-mechanized caving face.
