摘要
采用现场调查、数值模拟和地质力学分析的方法,以金山店铁矿东区-340 m和-410 m阶段运输巷为研究背景,开展巷道围岩变形破坏的断层效应研究。研究结果表明,采矿影响区内的断层破碎带巷道变形破坏严重,围岩破坏模式主要表现为巷道顶板垮塌、顶板非对称下沉变形、巷道围岩内挤变形引起的片帮或剥落、巷帮水平张拉裂缝等等模式;-340m阶段运输巷所在的断层破碎带F4位于矿体开采引起移动变形区域,岩体移动变形引起的水平应力释放导致断层破碎带F4与近矿角页岩A2分界面出现错动台阶;-340 m阶段运输巷变形与破坏机制矿体开采,引起巷道围岩向采空区方向移动变形和开采诱发的断层破碎带滑移活化直接造成顶板沿陡倾结构面垮塌两部分,-410m阶段运输巷变形与破坏机制是受开采诱发的-340 m水平及以上断层破碎带岩体下滑活化引起的挤压变形作用。
The field survey,numerical simulation and geomechanical analysis methods are applied in studying the fault effect on the deformation and failure of surrounding rock in the laneway,such as the−340 m and−410 m stages of the transportation lanes that are located at the eastern part of the Jinshandian iron mine.The results show that the deformation and damage of roadway near the fault fracture zone affected by mining is serious.The failure modes of surrounding rock include roof collapse,asymmetric subsidence and deformation of the roof,spalling induced by the deformation of surrounding rock in tunnel,horizontal tensile cracks of roadslides,etc.The fault-fracture zone F4,where the transportation lane at−340 m level,is located at the deformation zone of the ore body induced by mining.The horizontal stress release caused by the movement and deformation of rock body leads to a dislocation stair at the interface between the fault-fracture zone F4 and the hornfels A2 near the ore body.The deformation and failure mechanism of−340 m level haulage roadway includes the surrounding rocks in tunnel move and deform towards the worked-out area induced by the mining and the slippage and activation of the fault-fracture zone caused by mining result in the collapse of the roof along the steep structure plane.The deformation and failure mechanism of the transport lane at the−410 m stage is controlled by the squeezing deformation caused by the slip activation of the rock mass at the fault-fracture zone at the−340 m level and above depth.
作者
杨括宇
陈从新
夏开宗
宋许根
张伟
张褚强
王田龙
YANG Kuo-yu;CHEN Cong-xin;XIA Kai-zong;SONG Xu-gen;ZHANG Wei;ZHANG Chu-qiang;WANG Tian-long(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Road Transportation,China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan,Hubei 430063,China;School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan,Hubei 430068,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2020年第S01期279-289,共11页
Rock and Soil Mechanics
关键词
采矿工程
断层破碎带
破坏机制
悬臂梁
崩落法开采
mining engineering
fault-fracture zone
failure mechanism
cantilever beam
caving mining
