粗粒氯盐渍土动态回弹模量试验研究与理论模型  

Laboratory tests and theoretical model for dynamic resilient modulus of coarse-grained chlorine saline soil

作　　者：冉武平[1,2] 王金山 艾贤臣 陈慧敏[1,2] 钱建固 RAN Wu-ping;WANG Jin-shan;AI Xian-chen;CHEN Hui-min;QIAN Jian-gu(School of Civil Engineering&Architecture,Xinjiang University,Urumqi 830047,China;Xinjiang Civil Engineering Technology Research Center,Urumqi 830047,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047 [2]新疆土木工程技术研究中心,新疆乌鲁木齐830047 [3]同济大学地下建筑与工程系,上海200092

出　　处：《岩土工程学报》2021年第9期1746-1754,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51768070);民航飞行区设施耐久与运行安全重点实验室开放基金项目(MK201902)。

摘　　要：为探究粗粒氯盐渍土动态回弹模量受荷载、盐分及湿度影响下的变化规律,借用室内动三轴试验,研究了不同应力状况、含水率及含盐量条件下粗粒氯盐渍土动态回弹特性。结果表明:动态回弹模量随围压和体应力增加而增大,随偏应力、盐分及水分的增大而减小;粗粒盐渍土中含盐量和含水率越高,围压、偏应力和体应力对其动态回弹模量影响越明显;同一应力水平下,含盐量和含水率的增加引起动态回弹模量的降低幅度逐渐增大,且盐分较水分影响更显著。基于三参数理论模型对试验结果进行回归分析发现,该模型具有较高的决定系数,并建立了精度较高的模型参数预估公式,可有效预测粗粒氯盐渍土动态回弹模量。To explore the influences of load,salinity and humidity on the dynamic resilient modulus of coarse-grained chlorine saline soil,the dynamic rebound characteristics of the soil under different stresses,salt contents and water contents are studied based on the laboratory dynamic triaxial tests.The measured results reveal that the value of the dynamic resilient modulus inceases with the increase of the confining pressure and bulk stress,and decreases with the increase of the partial stress,salinity and moisture.The higher the salt content and moisture content in the soil,the more obvious the influences of the confining pressure,partial stress and bulk stress on its dynamic resilient modulus.Under the same stress,the value of the dynamic resilient modulus decreases more considerably with the increase of the salt content and moisture content,and the effects of salt tend to be more significant than those of water.Through the regression analysis of the test data based on a three-parameter theoretical model,the proposed model has a preferably higher determination coefficient,and the formula for predicting the model parameters with high precision is established.It is shown that the theoretical model is suitable to predict the dynamic resilient modulus of coarse-grained chlorine saline soil.

关 键 词：粗粒氯盐渍土 动态回弹模量 动三轴试验 演变规律 理论模型 

分 类 号：TU443[建筑科学—岩土工程]