周期性剪切应力作用下碎石的滑移特性  

The slip characteristics of gravel under periodic shear stress

作　　者：廖纤 陶康 刘煜 李舒彤 党文刚 LIAO Xian;TAO Kang;LIU Yu;LI Shutong;DANG Wengang(School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China;Geotechnical Institute,Tu Bergakademie Freiberg,Freiberg 09599,Germany)

机构地区：[1]中山大学土木工程学院,广东珠海5190822.弗莱贝格工业大学岩土工程研究所,德国弗莱贝格09599

出　　处：《中山大学学报（自然科学版）（中英文）》2024年第5期131-139,共9页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(51904359);广东省自然科学基金-海上风电联合基金(2022A1515240009)。

摘　　要：为了研究碎石材料在周期性剪切荷载条件下的滑移特性,使用自主研发的多功能动剪试验机,对碎石试样施加恒定的法向应力,以及不同峰值、谷值和频率的水平方向周期性剪切应力,监测试样在加载过程中剪切位移随时间的变化情况,并分析剪切位移增量的变化情况以及整个加载期内剪切应力对应的能量密度。研究结果表明:周期性剪切应力引起的滑移特征与其峰值、谷值和频率有关;周期性剪切应力会导致碎石材料的滑移跃变,且出现滑移跃变点的条件与加载期内的能量密度有关,可根据能量密度范围将试样的滑移状态划分为三个区域,即稳定区、过渡区和跃变区。In order to study the sliding characteristics of gravel materials under cyclic shear load,a self-developed multi-functional dynamic shear testing machine was used to apply constant normal stress and horizontal cyclic shear stress with different peak,valley and frequency to the gravel samples,and to monitor the change of shear displacement of the samples over time during loading.The change of shear displacement increment and the energy density corresponding to shear stress during the whole loading period are analyzed.The results show that the characteristics of slip induced by cyclic shear stress are related to its peak value,valley value and frequency.The periodic shear stress will lead to the slip jump of the gravel material,and the condition of the slip jump point is related to the energy density during the loading period.According to the range of energy density,the slip state of the sample can be divided into three regions,the stable region,the transition region and the jump region.

关 键 词：碎石路基 周期性剪切应力 多功能动剪试验机 滑移特性 剪切位移 能量密度 

分 类 号：U416[交通运输工程—道路与铁道工程]