Study on acoustic emission signal and damage characteristics of frozen sandstone under lateral unloading

被引：0

作者：

Liu S. ^{[1
]}

Yang G. ^{[1
]}

机构：

[1] College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Shaanxi, Xi'an

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷

基金：

中国国家自然科学基金;

关键词：

acoustic emission; damage; frozen sandstone; initial confining pressure; lateral unloading; rock mechanics; unloading rate;

D O I：

10.13722/j.cnki.jrme.2022.0268

中图分类号：

学科分类号：

摘要：

In order to study the influence of artificial freezing method on the deformation and damage of surrounding rock unloading,the stress change path of surrounding rock is simulated,and the lateral unloading mechanical test and acoustic emission signal monitoring are carried out under different conditions. The results show that the characteristics of total crack number,tensile crack number,cumulative AE count and cumulative AE count of tensile crack are basically the same with time for sandstone under different lateral unloading conditions. The increasing point(point A) of lateral unloading deformation rate of rock sample can be used as fracture warning. The peak stress of lateral unloading of sandstone after freezing is increased by 2.3-3 times. With the increase of initial confining pressure, the tensile action of frozen rock sample is enhanced,the lateral unloading rate is increased,and the tensile crack is reduced. The initial confining pressure and lateral unloading rate of frozen rock sample increase,the peak stress increases,and the failure becomes more severe. Under the same conditions, lateral unloading of rock samples accounts for 52%-72% of the triaxial compression capacity. The damage model is established according to the number of lateral unloading tensile cracks. The model results are very close to the test results before the peak stress,which can characterize the damage fracture characteristics of frozen sandstone under lateral unloading. © 2023 Academia Sinica. All rights reserved.

引用

页码：4237 / 4247

页数：10

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