Study on the relation between damage and permeability of sandstone at depth under cyclic loading
Yang Zhao
Hongwei Zhou
Jiangcheng Zhong
Di Liu
1.School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083,People's Republic of China;Mine Safety Technology Branch of China Coal Research Institute, Beijing 100013, People's Republic of China2.School of Energy and Mining Engineering, China University of Mining and Technology, Beijing 100083, People's Republic of China;State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083,People's Republic of China3.School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083,People's Republic of China4.School of Aerospace Engineering, Tsinghua University, Beijing 100084, People's Republic of China
摘要：The damage and permeability evolution of rock under stress is of great significance to engineering safety.In this paper,the evolution law of rock damage and permeability is studied by means of acoustic emission (AE) seepage experiment on deep roof sandstone with cyclic loading.Characterization of damage uses the changes in acoustic emission fractal characteristics and compression parameter which based on elastic modulus.The experimental results show that the AE events has fractal characteristic,in which the AE b-value and correlation dimension can represent the damage of rock.When the fractal characteristic value of AE increases,it indicates that the rock is in the compaction stage and the damage is not obvious.When the fractal characteristic value of AE drops,it indicates that the rock was damaged,and the permeabilityincrease.Under the cyclic load increasing step by step,the elastic modulus first increases and then decrease.Introducing compression parameter C to characterize the state of compaction and damage,it is obtained that the rock damage state and hydrostatic permeability show a power law function relationship with porosity and have the same monotonicity.When compression parameter is less than zero,the evolution law of permeability and damage can be described by functional relationship between hydrostatic permeability K and compression parameter C.
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论文发表日期：2019-01-01
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：14( 479-492 )
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