地铁线路穿越急倾斜煤层采空塌陷区相似模型试验  

Similarity Model Test of Subway Line Passing Steeply Inclined Mined-out Subsidence Area

作　　者：黄昌富[1,2] 迟大祥 田书广[2] 丁银平 常聚才[4] HUANG Chang-fu;CHI Da-xiang;TIAN Shu-guang;DING Yin-ping;CHANG Ju-cai(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing 100083,China;China Railway 16th Bureau Group Co.,Ltd.,Beijing 100018,China;China Railway 16th Bureau Group Metro Engineering Co.,Ltd.,Beijing 100029,China;School of Energy and Safety,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]中铁十六局集团有限公司,北京100018 [3]中铁十六局集团地铁工程有限公司,北京100029 [4]安徽理工大学能源与安全学院,淮南232001

出　　处：《科学技术与工程》2018年第31期58-63,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51774020)资助

摘　　要：地铁线路穿越煤矿采空塌陷区问题为中国首例,因此进行急倾斜煤层开采岩移基本规律和地铁荷载作用下塌陷区及侧壁围岩稳定性研究具有重要意义。运用相似模型试验方法,模拟开采两组急倾斜特厚煤层,并用数码相机记录开采及加载过程中岩层破断及移动形态。试验反映了急倾斜煤层开采中垮落带形态、裂隙带形成与发展和地表移动特征等共性;此外,分别以顶底板移动角、边界角,表土层移动角、边界角参数计算煤层开采覆岩破坏边界范围,并以此划分不稳定区、基本稳定区和稳定区;考虑地铁及建筑荷载下,塌陷区破断岩体有闭合压实现象,地表最大下沉量为4~5 cm,顶板侧壁不稳定围岩最大离层量2 cm。所得结果对指导现场地铁线路穿越煤层采空塌陷区具有一定的参考意义。Subway lines through the coal mined-out area for China s first case,therefore,the research on the the basic law of rock movement in steep coal seam mining and stability of surrounding rock in subsidence area under subway load is of great significance.The similar model test method was used to simulate the mining of two groups of steeply inclined and extremely thick coal seams.The fracture and movement patterns of the rock strata during mining and loading were recorded by a digital camera.The test reflects the common features of the collapse zone morphology,the development of the fracture zone and the characteristics of surface movement in the mining of steeply inclined coal seams.In addition,the failure range of the overlying strata in coal mining is calculated by the parameters of the boundary angle,the movement angle of the the top and bottom corners,the boundary angle,the movement angle of the topsoil.Considering the subway and building loads,the broken rock mass in the subsidence area has a closed pressure,the maximum surface subsidence is 4~5 cm,and the maximum thickness of the surrounding rock on the top wall is 2 cm.The results provide reference for guiding the subway line passing through the subsidence area of coal seam.

关 键 词：相似模型试验 岩层移动 急倾斜煤层 地铁荷载 

分 类 号：TU457[建筑科学—岩土工程]