三轴循环荷载下岩石动态特性参数研究  

Study on dynamic characteristic parameters of rock under triaxial cyclic loading

作　　者：黄兴建[1] 付小敏[1] 沈忠[1] 宾婷婷 HUANG Xingjian;SHEN Zhong;BIN Tingting;FU Xiaomin(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《中国测试》2016年第7期117-122,共6页China Measurement & Test

基　　金：国家自然科学基金项目(41272321)

摘　　要：利用MTS815 Flex Test 40岩石力学试验系统对粉砂质泥岩和泥质粉砂岩进行三轴循环荷载试验。研究两种岩石在三轴循环荷载作用下,动剪切模量和动泊松比参数的变化规律。结果表明:1)在相同轴向振动荷载和振动次数作用下,两种岩石的动剪切模量随着围压的增加呈现出先增加再减小的变化规律,动泊松比没有明显的变化规律。2)在相同围压和轴向振动荷载作用下,两种岩石的动剪切模量随着振动次数的增加呈现逐渐减小的变化规律,动泊松比呈现逐渐增加的变化规律。3)在相同围压和振动次数下,两种岩石的动剪切模量与动泊松比随着轴向振动荷载的增加都无明显规律。试验成果对研究岩土工程地基岩石的地震反应和边坡工程的安全稳定性评价可提供参考依据。MTS815 Flex Test 40 rock mechanics test equipment is used for triaxial cyclic loadingtests to silty mudstone and argillaceous siltstone to study the changing laws of their dynamic shearmodulus and dynamic Poisson’ s ratio under triaxial cyclic loading. Results show that: 1)Under thesame axial vibrating load and number of vibration, the dynamic shear modulus of the two rocksincreases first and then decreases as the confining pressure increases,while the dynamic Poisson’ sratio does not show any obvious changes. 2 )Under the same confining pressure and axial vibratingload, the dynamic shear modulus of the two rocks gradual decreases as the number of vibrationincreases, while the dynamic Poisson’ s ratio gradually increases. 3 ) Under the same confiningpressure and number of vibration, the dynamic shear modulus and dynamic Poisson’ s ratio of thetwo rocks do not show any obvious lawsas the axial vibrating load increases. The results providereference for further study on seismic response of geotechnical engineering foundation rocks andevaluation on safety and stability of slope engineering.

关 键 词：粉砂质泥岩 泥质粉砂岩 三轴循环荷载 动剪切模量 动泊松比 

分 类 号：TU441[建筑科学—岩土工程]