下伏复杂空区山体斜坡滑塌形成机理与数值模拟研究  

Mechanism Analysis and Numerical Simulation for Landslide of Mountain Slope with Underground Complex Goaf

作　　者：刘璨[1] 姜安民 董彦辰[1,2] 王飞飞 熊奇伟 武庚鑫 LIU Can;JIANG An-min;DONG Yan-chen;WANG Fei-fei;XIONG Qi-wei;WU Geng-xin(Hunan Urban Construction College,Xiangtan 411100,Hunan,China;School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,Hunan,China;Changsha Institute of Mining Research Co Ltd,Changsha 410012,Hunan,China;Hunan Friendship International Engineering Consulting Co Ltd,Changsha 410005,Hunan,China;China Construction 4th Engineering Bureau 6th Co Ltd,Hefei 230011,Anhui,China)

机构地区：[1]湖南城建职业技术学院,湖南湘潭411100 [2]中南林业科技大学土木工程学院,湖南长沙410004 [3]长沙矿山研究院有限责任公司,湖南长沙410012 [4]湖南友谊国际工程咨询股份有限公司,湖南长沙410005 [5]中建四局第六建设有限公司,安徽合肥230011

出　　处：《矿冶工程》2022年第4期35-38,42,共5页Mining and Metallurgical Engineering

基　　金：“十三五”国家重点研发计划(2019YFC0605302);国家科技部重大科技领域创新方法研究与应用(SQ2019IM3640003);湖南省自然资源厅科研项目(2022-50)。

摘　　要：以某金属矿山山体斜坡滑塌为研究背景,分析了矿山滑坡地质灾害产生过程及形成机理,并采用数值模拟方法模拟了山体斜坡潜在滑弧面与斜坡发生的位移。结果表明,山体斜坡滑塌主要由三个阶段构成:山体地表塌陷裂缝形成阶段、山体地表塌陷裂缝扩展阶段和山体斜坡滑塌阶段,并分析了每个阶段形成与发展机理;岩层结构面产状对山体斜坡稳定性有重要影响,它加速了塌陷坑的扩展;斜坡原始状态安全系数为1.23,大于许用安全系数,原始状态斜坡处于稳定状态,在井下矿体开采影响下,山体斜坡沿着潜在滑弧面形成上牵引式-下推移式复合形式的山体滑坡。数值模拟得到的潜在滑弧面与机理分析的滑弧面基本一致,验证了机理分析的准确性。滑坡体水平方向长度为243 m,垂直方向深度为128 m,斜坡坡脚处最大位移为4.0 m,整体斜坡滑塌基本沿着分析得到的潜在滑弧面发生滑坡。研究结果可为矿山地质灾害治理设计提供参考。Aiming at the occurrence of landslide in a metal mine, the process of landslide and its causing mechanism were analyzed, and the potential sliding surface and the displacement of slope were simulated by using numerical simulation method. The results show that the slope landslide process can be divided into three stages, from a cracking stage due to slope surface subsidence, a crack expansion stage, to a landslide occurrence stage. Based on analysis of occurring causes and development mechanism for each stage, it is found that the occurrence of rock structural plane has an important influence on the stability of mountain slope, which can accelerate the expansion of collapse pit. The safety factor of the slope in the original state is 1.23, which is greater than the allowable safety factor, thus the slope is originally stable. Under the influence of underground mining, a landslide is occurred along the potential sliding surface triggered by a pull force plus thrust load. The potential sliding surface obtained by numerical simulation is almost consistent with that obtained by landslide mechanism analysis, which verifies the accuracy of the mechanism analysis. It is shown that the travelling distance of the sliding mass is 243 m and 128 m, respectively, in the horizontal and vertical direction, and the maximum displacement at the toe of the slope is 4.0 m. The landslide mass of whole slope almost moves along the potential sliding surface obtained by the analysis. This research results can provide reference for the design of geological disaster control for mines.

关 键 词：采矿工程 地下采空区 山体斜坡 滑坡 机理研究 滑塌 

分 类 号：TD853[矿业工程—金属矿开采]