摘要
温度对软黏土孔隙水压力和应力–应变关系特性具有重要影响。通过自主研发的温控三轴仪,研究恒温、升温和降温3种不同温度模式下软黏土孔隙水压力变化规律和应力–应变特性,升温和降温模式下重点研究不同时间间隔和不同围压对软黏土孔隙水压力的消散、应力–应变关系模式、剪切强度和弹性模量的影响。结果表明:在恒温模式下,温度从10℃增加至70℃,孔隙水压力消散速率变大消散量明显增加。在升温和降温模式下,孔隙水压力呈现波动性下降,时间间隔和围压的增大均能促进孔隙水压力的消散;在恒温模式下,随温度升高应力–应变模式由应变硬化转化为应变软化,剪切强度明显提高,弹性模量整体上呈现出先下降后上升的趋势。在升温模式和降温模式下,土体的应力–应变模式均呈现应变硬化,时间间隔和围压对提高土体的剪切强度和弹性模量具有明显影响。
Temperature has an important influence on pore water pressure and stress-strain relationship of soft clay. Through a self-developed temperature controlled triaxial apparatus,the development of pore water pressure and stress-strain characteristics of soft clay under three different temperature modes including constant temperature,heating and cooling were studied. Under the temperature rise and temperature drop modes,the effects of time interval and confining pressure on the dissipation of pore water pressure,stress-strain relationship,shear strength and elastic modulus of soft clay were emphatically studied. The results show that the dissipation rate and amount of pore water pressure increase with increasing temperature from 10 ℃ to 70 ℃ in constant temperature mode.In the heating and cooling modes,the pore water pressure shows a fluctuant decrease and the increases of the time interval and the confining pressure could promote the dissipation of the pore water pressure. In the constant temperature mode,the stress-strain mode changes from strain hardening to strain softening with increasing the temperature,the shear strength increases obviously,and the elastic modulus shows a trend of first decreasing and then increasing. In the heating and cooling modes,the stress-strain mode of soil is strain hardening,and the time interval and the confining pressure obviously have positive influence on the shear strength and the elastic modulus.
作者
雷华阳
郝琪
冯双喜
张雅杰
蒋明镜
LEI Huayang;HAO Qi;FENG Shuangxi;ZHANG Yajie;JIANG Mingjing(Department of Civil Engineering,Tianjin University,Tianjin 300354,China;Key Laboratory of Coast Civil Structure Safety of Education Ministry,Tianjin University,Tianjin 300354,China;Key Laboratory of Comprehensive Simulation of Engineering Earthquake and Urban-Rural Seismic Resilience,China Earthquake Administration,Tianjin 300350,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2020年第11期2308-2318,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点研发计划项目(2017YFC0805407)
国家自然科学基金重大项目(51890911)
同济大学土木工程防灾国家重点实验室开放课题基金项目(SLDRCE17–01)。
关键词
土力学
温度模式
软黏土
孔隙水压力
应力–应变特性
soil mechanics
temperature modes
soft clay
pore water pressure
stress-strain characteristics
