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| Research on permeability and acoustic emission characteristics of karst collapsed column skeleton sandstone under triaxial compression |
| LIU Weitao1，DU Yanhui1，YU Shijian1，YIN Dawei1，XU Hongtao2，HE Runshan2，MENG Xiangxi1 |
| (1. State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；2. Shanxi Shiquan Coal Industry Co.，Ltd.，Changzhi，Shanxi 046200，China) |
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Abstract To study the mechanical properties，seepage characteristics and essential acoustic emission characteristics of collapse column skeleton sandstone under different confining pressures and osmotic pressures，triaxial compression seepage tests were conducted by triaxial seepage experiment system combined with AE21C acoustic emission monitoring system，and the total stress-strain curve and the permeability curve of sandstone during deformation，as well as the evolution laws of deformation，permeability and acoustic emission signals of sandstone，were obtained. The results show that collapse column skeleton sandstone has obvious brittleness，that under the same osmotic pressure，the peak stress strength，the elastic modulus and the peak strain of sandstone increase with increasing the confining pressure，and that the confining pressure has an apparent effect on the macroscopic failure characteristics of sandstone with the failure mode gradually changing from multi-crack shear failure to single inclined-plane shear failure. The sandstone has low permeability characteristics，and the evolution law on the permeability of sandstone，generally characterized by a three-stage evolution of gradual decrease followed by steady development and rapid increase，is closely related to the stress-strain relationship under triaxial loading. It is also revealed that the variation characteristics of acoustic emissions are essentially consistent with the characteristics of stress-strain and permeability curves. In the initial stage，the ringing counting rate decreases with increasing the confining pressure；in the fracture development and propagation stage，the ringing counting rate of acoustic emissions presents a densely active state and gradually increases；during the unstable failure stage，the ringing counting rate increases rapidly and then quickly decreases. The test results provide an essential reference for studying the variation laws of a karst collapse column¢s stability and permeability.
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2021, Vol. 40 
