Study on the critical stress threshold of weakly cemented sandstone damage based on the renormalization group method
作者机构：Beijing China Coal Mine Engineering Company Limited.Beijing 100013China School of Civil and Resource EngineeringUniversity of Science and Technology Beijing.Beijing 100083China School of Mining and GeomaticsHebei University of Engineering.Handan 056038.China
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2020年第7卷第4期
页 面：693-703页
核心收录：
学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）]
基 金：the National Natural Science Foundation of China(Grant No.51534002) the Special Funds for Technological Innovation and Entrepreneurship of China Coal Science and Engineering Group Co.Ltd.(2018-TDMS011)
主 题：Weakly cemented sandstone Renormalization group method Damage and failure Threshold
摘 要：During the microstructural analysis of weakly cemented sandstone,the granule components and ductile structural parts of the sandstone are typically *** the contact between granules in the microstructure of weakly cemented sandstone,three basic units can be determined:regular tetrahedra,regular hexahedra,and regular *** group models with granule-and pore-centered weakly cemented sandstone were established,and,according to the renormalization group transformation rule,the critical stress threshold of damage was *** results show that the renormalization model using regular octahedra as the basic units has the highest critical stress *** threshold obtained by iterative calculations of the granule-centered model is smaller than that obtained by the pore-centered *** granule-centered calculation provides the lower limit(18.12%),and the pore-centered model provides the upper limit(36.36%).Within this range,the weakly cemented sandstone is in a phase-like critical *** is,the state of granule aggregation transforms from continuous to *** the relative stress range of 18.12%-36.36%,the weakly cemented sandstone exhibits an increased proportion of high-frequency signals(by 83.3%)and a decreased proportion of low-frequency signals(by 23.6%).The renormalization calculation results for weakly cemented sandstone explain the high-low frequency conversion of acoustic emission signals during *** research reported in this paper has important significance for elucidating the damage mechanism of weakly cemented sandstone.
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