摘要
为了研究温、湿环境对粗粒料力学特性的影响,研制可以精准控制温度和湿度的粗粒料大型三轴试验仪。该试验仪通过控制压力室水温的方法实现试样的温度控制,通过循环恒湿蒸汽的蒸汽平衡法实现试样的湿度控制。提出一套控制粗粒料温、湿度的三轴试验方法,包括恒温、恒湿养护联合循环恒温、恒湿蒸汽的粗粒料湿度高效控制方法,考虑变温、变压对外体变量测影响的外体变修正方法,以及粗粒料试样温控可靠性的检测方法。利用该仪器对千枚岩粗粒料进行控制温、湿度的三轴剪切及流变试验,并探讨温、湿度对粗粒料力学特性影响的内在机制。结果表明,新研制的试验仪可精准实现粗粒料温、湿度控制,温度及湿度的升高会弱化粗粒料的力学特性。
To investigate the influence of the temperature and the relative humidity on the mechanical behaviour of coarse granular materials,a large-scale triaxial apparatus,which can accurately control the temperature and the relative humidity of coarse granular materials,was developed. Temperature control was achieved by controlling water temperature in the pressure chamber and relative humidity control was achieved by circulating water vapor in the sample. A set of methods for controlling the temperature and humidity of coarse granule materials in triaxial test were proposed,including the rapid relative humidity control method for coarse granular materials,the method to modify the external volume change measurement considering the influence of varying temperature and confining pressure,and the reliability detection method for sample temperature control. A series of triaxial shear and creep tests by controlling the temperature and the relative humidity were performed for phyllite coarse granular materials,meanwhile the internal mechanism of temperature and humidity effect on the mechanical properties of coarse granular materials was discussed. The results show that the new apparatus can accurately control the temperature and the relative humidity of coarse granular materials and that the increase of the temperature or the relative humidity would weaken the mechanical properties of coarse granular materials.
作者
毛航宇
刘斯宏
沈超敏
王柳江
初文婷
MAO Hangyu;LIU Sihong;SHEN Chaomin;WANG Liujiang;CHU Wenting(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098,China;International Joint Laboratory of Long-term Behaviour and Environmentally Friendly Rehabilitation Technologies on Dams,Hohai University,Nanjing,Jiangsu 210098,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2021年第6期1258-1266,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51979091,52009036)
中央高校基本科研业务费专项资金(B200205028)。
关键词
土力学
粗粒料
温、湿度控制
三轴试验
流变试验
soil mechanics
coarse granular materials
temperature and relative humidity control
triaxial test
creep test
