摘要
破碎围岩环境下大断面巷道开挖必然形成大尺度采空区(large scale of mined-out-area,LSMA),其围岩介质的变形与失稳行为及过程很复杂,主要涉及到开采扰动区(excavation dis-turbed zone,EDZ)范围内围岩力学性态及强度劣化特征、顶部岩层非稳态下沉与水平挤压变形耦合作用诱致动力失稳、深层围岩离层演化至局部化冒落失稳等,且其变形从微尺度演化为大尺度(寸)过程具有复杂的非线性特征,这为灾害治理带来挑战。基于现场调查,利用表面变形与深部离层规律综合监测与锚杆(索)力学性态试验及测试,结合室内物理相似模拟和数值模拟试验,深入分析复杂地质条件下松软破碎围岩局部化变形与演化失稳机理,为工程防灾和减灾提供科学依据。
The large scale of mined-out-area （LSMA） will be caused inevitably due to excavation of a large scale across-section in crushed rock-mass conditions, and its failure behavior and process is complex. Those mainly related to the mechanical properties and its deterioration in EDZ, non-stable subsidence of roof rocks and horizontal squeezing and its coupling effect so as to destabilization, delamination upon deepening rocks at roof induced to the localized dynamic destabilization. All of processes that the micro-scale deformation shifts to large scale manifested non-linear essential. This brought challenge for hazard prevention. The field monitoring includes surface deformation,the deepening of delamination and its corresponding movement regularity,in-situ experiment and test of belt-cable mechanical property and engineering quality,etc, based on field geologic investigation. In addition, the model physical and numerical computation as prediction had been adopted. All those were intended to seek the mechanism on localization deformation and destabilization in softening and crushed rock-mass conditions at large.
出处
《西安科技大学学报》
CAS
北大核心
2007年第4期544-549,共6页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金资助项目(10402033)
教育部重点实验室重点资助项目(04JS19)
关键词
破碎围岩条件
大尺度采空区
局部化变形
动力失稳
crushed rock-mass conditions
large scale of mined-out-area（LSMA）
localization deformation
dynamic destabilization
作者简介
张建华（1968-），男，宁夏吴忠人，工程师，主要从事采矿与安全工程研究．
