不同原岩应力下厚度对急倾斜矿体开采岩移规律的影响  

Effect of Thickness on Rockmass Movement Law of Steeply Inclined Orebody Mining Under Different In-situ Rock Stress

作　　者：郭延辉 侯克鹏[2] 李克钢[2] 杨志全[3] GUO Yanhui;HOU Kepeng;LI Kegang;YANG Zhiquan(College of Civil and Architectural Engineering,Yunnan Agricultural University,Kunming 650201,China;Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Public Security and Emergency Management,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]云南农业大学建筑工程学院,云南昆明650201 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]昆明理工大学公共安全与应急管理学院,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2020年第2期31-37,共7页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金面上项目(41672303);云南省科技厅应用基础研究面上项目(2018FB075);中国博士后科学基金项目(2017M620433).

摘　　要：为研究不同原岩应力环境下厚度对急倾斜矿体开采岩体移动规律的影响,基于三维离散元软件3DEC,对比分析了自重应力和构造应力(σ_h/σ_ν=1.5)条件下,五种不同矿体厚度开采引起的地表与围岩移动变形规律.结果表明:在两种不同原岩应力环境下,围岩与地表移动量及采动影响范围均随矿体厚度的增大呈非线性增加,但是二者在地表沉陷盆地形态及变形速率、采空区围岩移动特征、变形影响范围等方面存在较大差异.原岩应力场中作为特征量的最大主压应力的方向对岩体移动行为的影响是引起这种差异的根本原因.In order to study the influence of orebody thickness on rockmass movement in steeply inclined orebody mining under different in-situ stress conditions,the law of rockmass movement caused by mining with different orebody thickness under two kinds of in-situ stress conditions,i.e.gravity stress and tectonic stress(σ_h/σ_ν=1.5)were analyzed based on the three-dimensional discrete element software 3 DEC.The results show that the displacement of surrounding rock and surface and the mining influence range under the two different stress environments increase nonlinearly with the increase of orebody thickness.However,there are great differences between them in the law of surrounding rock movement,the shape and deformation rate of surface subsidence basin,and the expansion mode of mining influence area.The influence of the direction of the maximum principal compressive stress as the characteristic quantity in the original rock stress field on the movement behavior of rock mass is the fundamental cause for this difference.

关 键 词：自重应力 构造应力 岩体移动 地表沉陷 3DEC 数值模拟 

分 类 号：X936[环境科学与工程—安全科学] TU452[建筑科学—岩土工程]