不同固结压力下松散颗粒剪切声发射特征研究  

Study on Shear Acoustic Emission Characteristics of Loose Particles Under Different Consolidation Pressures

作　　者：海英 张婷婷 吴鑫[1,2] 李龙灿 黄成佳 刘馨圯 Hai Ying;Zhang Tingting;Wu Xin;Li Longcan;Huang Chengjia;Liu Xinyi(School of Engineering,Sichuan Normal University,Chengdu,Sichuan 610101;Key Laboratory of Southwest Land Resources Evaluation and Monitoring,Ministry of Education,Sichuan Normal University,Chengdu,Sichuan 610068)

机构地区：[1]四川师范大学工学院,四川成都610101 [2]四川师范大学西南土地资源评价与监测教育部重点实验室,四川成都610068

出　　处：《非金属矿》2024年第5期28-31,36,共5页Non-Metallic Mines

基　　金：国家应急管理部安全生产重特大事故防治关键技术项目(Sichuan-0011-2018AQ);四川省科技计划项目(24NSFSC0343,19YYJC2854)。

摘　　要：为研究松散颗粒的力学性质及声发射(AE)特征的演化规律,采用固结剪切试验及AE系统,在不同固结压力下对松散颗粒进行剪切破坏试验,分析固结剪切全过程中固结特征、力学特征及声发射特征之间的关系。结果表明,在固结过程中,随着固结压力的增大,松散颗粒孔隙比和压缩系数不断减小,压缩模量增大。在剪切试验中,随着固结压力的增大,其剪应力也随之增大,最大值可达350 kPa左右,AE能量和振铃计数不断增大,b值不断降低,且b值达到稳定状态的值越来越小。这些参数的变化与颗粒剪切内部结构破坏阶段密切相关。In order to study the mechanical properties and evolution of AE characteristics of loose particles,consolidation shear tests and acoustic emission AE systems were used to conduct shear failure tests on loose particles under different consolidation pressures.The relationship between consolidation characteristics,mechanical characteristics,and acoustic emission characteristics during the entire consolidation shear process was analyzed.The results show that during the consolidation process,as the consolidation pressure increases,the porosity and compression coefficient of the loose particles continuously decrease,while the compression modulus increases.In the shear test,as the consolidation pressure increases,the shear stress also increases,with a maximum value of about 350 kPa.The AE energy and ringing count continue to increase,while the b value decreases,and the value at which b reaches a stable state becomes smaller.The changes in these parameters are closely related to the stage of internal structural damage caused by particle shear.

关 键 词：松散颗粒 固结压力 剪应力 声发射 

分 类 号：TU44[建筑科学—岩土工程] X936[建筑科学—土工工程]