颗粒材料在三轴试验中滞滑现象的研究  

Study on Stick-slip Behaviour of Granular Materials in Triaxial Test

作　　者：陈波[1] 李永强 刘旭锋[1] 周仰新 许言 CHEN Bo;LI Yongqiang;LIU Xufeng;ZHOU Yangxin;XU Yan(School of Civil and Architecture Engineering,East China University of Technology,Nanchang 330013,China;Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;Nanchang Emergency Management Bureau,Nanchang 330038,China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330013 [2]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [3]南昌市应急管理局,江西南昌330038

出　　处：《防灾减灾工程学报》2023年第3期568-575,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：黑龙江省自然科学基金项目(LH2019E095);国家自然科学基金项目(52068002);江西省“双千计划”项目(JXSQ2020101041);江西省自然科学基金项目(20202BABL204064);中国地震局工程力学研究所基本科研业务费专项资助项目(2019C06)资助。

摘　　要：球形玻璃砂和不锈钢珠是两种典型的颗粒材料,采用这两种材料进行不同围压下的常规三轴排水和不排水试验,研究颗粒材料在三轴试验中的滞滑现象。研究工作表明,两种材料在三轴排水试验中都存在明显的滞滑现象,围压大小会直接影响滞滑时应力值跌落的幅度,但两种材料在滞滑中的表现却有明显不同,并且玻璃砂样中的滞滑现象随着玻璃砂样的重复使用而减弱至基本消失,表明玻璃砂试样的制备历史对其滞滑现象的发展具有重要影响。玻璃砂和钢珠不同的表面特征是影响两种材料滞滑现象差异性的一个重要因素。重复使用的玻璃砂颗粒表面特征会发生明显改变,这是其滞滑现象逐渐减弱的重要原因。试验结果对玻璃砂和钢珠等颗粒材料滞滑现象发生机制的深入研究提供一定参考,为滞滑演变规律的微观机制探究提供思考方向。Spherical glass sand and stainless-steel beads are two typical granular materials.These two materials are used for conventional drained triaxial compression tests and undrained triaxial compression tests under different confining pressures to examine the stick-slip behavior of granular materials during triaxial tests.The research work shows that both materials exhibit obvious stick-slip behavior in drained triaxial compression tests,and the confining pressure directly affects the amplitude of stress drop during stick-slip behavior.However,the two materials demonstrate noticeable differences in their stick-slip behavior.Moreover,repeated drying of the glass sand sample significantly reduces or even eliminates the stick-slip behavior.The results show that the preparation history of glass sand sam-ples has an important influence on the development of the stick-slip behavior.The different surface characteristics of glass sand and steel beads are important factors contributing to the dissimilar stickslip behaviors between the two materials.The surface characteristics of reused glass sand particles change obviously,which is an important reason for the gradual weakening of its stick-slip behavior.The test results provide valuable insights for a deeper understanding of the stick-slip behavior in granular materials such as glass sand and steel beads.In addition,they provide potential directions for exploring the micro-mechanism of stick-slip evolution.

关 键 词：颗粒体系 滞滑现象 离散材料 三轴试验 

分 类 号：TU43[建筑科学—岩土工程]