动荷载作用下冻结黏土破坏特性试验研究  

Experimental study on failure properties of frozen clay under dynamic loading

作　　者：栗晓林 王红坚 邹少军 江聪[4] 牛永红 LI Xiaolin;WANG Hongjian;ZOU Shaojun;JIANG Cong;NIU Yonghong(State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Unit 63983 of PLA,Wuxi 214035,China;Key Laboratory of the Western Disaster and Environmental Mechanics,Ministry of Education,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]中国科学院西北生态环境资源研究院冻土工程国家重点实验室 [2]中国科学院大学 [3]中国人民解放军63983部队 [4]兰州大学西部灾害与环境力学教育部重点实验室

出　　处：《中南大学学报（自然科学版）》2019年第3期641-648,共8页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划(2017YFC0405103);冻土工程国家重点实验室自主立项课题(SKLFSE-ZY-15)~~

摘　　要：对冻结黏土进行单轴压缩试验和振动荷载试验,研究静-动荷载作用下冻结黏土的破坏强度、起始屈服强度、破坏应变、破坏时间、破坏应变比能,并进行对比分析。研究结果表明:冻结黏土破坏强度和起始屈服强度随温度降低而显著增大,振动频率的影响较小;冻结黏土破坏应变和破坏时间随温度降低呈现先增大后减小的趋势,温度的降低导致冻结黏土脆性增强;冻结黏土破坏应变比能是衡量冻结黏土抵御破坏能力的指标,随温度降低而增大,振动频率的影响规律不明显;在振动荷载作用下,破坏强度和起始屈服强度增大,破坏应变、破坏时间和破坏应变比能减小,振动荷载使得冻结黏土脆性增强,并且有利于破坏冻结黏土。The uniaxial compression tests and the vibrating load tests were carried out,and the failure strength,initial yield strength,failure strain,failure time,failure strain energy of frozen clay were studied and compared under static-dynamic loading.The results show that the failure strength and initial yield strength of frozen clay increase significantly with the decrease of temperature,and the influence of vibrational frequency is relatively small.The failure strain and time of frozen clay show a tendency to increase firstly and then decrease with the decrease of temperature,and the decrease of temperature enhances the fragility of frozen clay.The failure strain energy of the frozen clay is an indicator to measure the ability of frozen clay to resist damage,which increases with the decrease of the temperature and the influence of the vibrational frequency is not obvious.In the situation of vibrating load,the failure strength and the initial yield strength increase,but the failure strain,the failure time and the failure strain energy all decrease.The vibrating load enhances the fragility of frozen clay and is good for destroying the frozen clay.

关 键 词：冻结黏土 破坏强度 破坏应变 破坏应变比能 

分 类 号：TU445[建筑科学—岩土工程]