含Y字形弱层顺倾层状边坡稳定性与破坏机制  

On the stability and its failure mechanism of the dip-bedded slope with the Y-shaped weak layers

作　　者：王东[1] 郭海建 吕文伟 李思维 蔡明祥 WANG Dong;GUO Hai-jian;LU Wen-wei;LI Si-wei;CAI Ming-xiang(College of Mines,Liaoning Technical University,Fuxin 123000,Liaoning,China;China Shenhua Haerwusu Open-pit CoalMine,Ordos 010700,Inner Mongolia,China;Shenhua Xinjiang Toksun MiningCo.,Ltd.,Turpan 838000,Xinjiang,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]中国神华哈尔乌素露天煤矿,内蒙古鄂尔多斯010700 [3]神华新疆托克逊矿业有限责任公司,新疆吐鲁番838000

出　　处：《安全与环境学报》2019年第6期1940-1946,共7页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51874160);辽宁省高等学校创新团队支持计划项目(LT2018008);辽宁省高等学校创新人才支持计划项目(LR2016039)

摘　　要：针对黑山露天煤矿底帮上赋存大量稳定性极差的烧变岩且含Y字形弱层的边坡失稳与破坏问题,通过定量计算与定性分析,提出了两种煤柱留设方案。首先,采用刚体极限平衡法从二维角度确定了底帮边坡的形态参数。然后,借助FLAC3D强度折减技术,针对含Y字形弱层顺倾层状边坡留煤柱和不留煤柱的两种设计方案建立边坡模型,研究边坡岩土体内部应力与应变分布情况,揭示了边坡失稳模式及破坏机制。结果表明:Y字形弱层是影响黑山露天煤矿底帮边坡稳定性的主控因素,边坡的失稳模式是以圆弧为侧界面、以弱层为底界面的切层-顺层式滑动;不留煤柱设计方案边坡稳定性主要受烧变岩下覆弱层控制,滑坡的力学特性为牵引式,留煤柱设计方案边坡稳定性受烧变岩下覆弱层及13-2煤下覆弱层的联合影响,由于煤柱的支挡效应,滑坡力学特性为推动式。The present paper is to devote itself to a thorough problem analysis for the stability and failure mechanism of the dip-bedded slope with the weak layers of Y-shape in the opencast mines by taking the side slope of the Heishan open-cast mine as a case study sample. As a specific feature of the geological process and the artificial excavation,slope mining stability of the open-cast mine has been usually influenced by such unfavorable geo-structures as the burnt rocks and weak layers,which has in turn made its deformation and damage tendency complex and complicated,resulting in one of the most controversial problems in such mining fields. To explore the deformation and failure regularity and the mechanical evolutionary mechanism of such dip-bedded slopes with the eroded rocks in such mines and determine the impact of the Y-shaped weak layers on the slope deformation,we have managed to make a numerical simulation as the engineering background means based on the FLAC3 Dstrength reduction theory. For the above said purposes,we would like to make a detailed analysis of a 3-D contour of the displacement magnitude and the strain increment so as to be convenient to disclose the entire internal movement and deformation mechanism and regularity of such slope rocks. For,it is only in this way that can determine the potential failure mode,the position and the shape of the sliding mining surface from the point of view of the surrounding space. Through the comparison and analysis of the evolution and distribution laws of the slope at different projects,it would be possible to clarify and determinate the types of the landslide kinetics and the genetic mechanisms so as to reveal the effects of the burnt rocks and the Y-shaped weak layers on the consequential deformation and damage. The results of our exploration show that the unstable modes of the side slope of the Heishan opencast coal mine is the consequence of the slip of beddingcutting due to the Y-shaped weak layers of the coal seam at the bottom interface. The mining stabil

关 键 词：安全工程 露天煤矿 烧变岩 Y字形弱层 边坡稳定性 失稳模式 破坏机制 

分 类 号：X928.03[环境科学与工程—安全科学]