Study on similar destructive test of sandy rocks and rock-like materials based on acoustic emission under uniaxial compression
PENG Rui
YANG Xuehong
ZHAN Shaowei
GAO Chao
Abstract：To more reasonably select similar materials for pseudo-sandstone,single-axis compression tests were conducted to study the mechanical properties and fracture evolution characteristics under compression of both sandstone and pseudo-sandstone materials.Based on experimental results,the relationship between acoustic e-mission(AE)event counts,spatiotemporal evolution patterns,AE b-values,and time for sandstone and pseudo-sandstone under single-axis compression conditions was analyzed.Optimal mixing ratios for pseudo-sandstone were determined.The study indicates that the fracture characteristics of sandstone samples and pseudo-sand-stone with a ratio of 5∶1∶0.5 exhibit high similarity.The entire process of sandstone testing can be divided in-to three stages:initial rise,stability,and fluctuation,which transitions to rise and fluctuation stages as the com-pressive strength of pseudo-sandstone decreases.Pseudo-rock materials show pronounced AE responses throughout the testing process,both undergoing impact fractures;however,compositions of high-energy events differ,with pseudo-rock generating less energy than sandstone due to differing lithology,displaying distinct fracture modes.Sandstone primarily exhibits a longitudinal single fracture zone with few surface microcracks,whereas pseudo-rock exhibits numerous surface microcracks aside from the central main fracture zone.Both sandstone and similar materials exhibit b-values ranging between 2.5 and 6 during loading,decreasing with in-creased loading.This research provides a theoretical basis for selecting pseudo-rock materials in rock mechan-ics engineering.
Keywords：sandstonesandstone-like materialmaterial selectionsimilar destructionacoustic emission char-acteristicsspatiotemporal evolution
Publication Date：2024-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 7-18 )