基于蠕变力学试验的岩石长期强度研究  

Long-term Strength Research of Rock Based on Creep Mechanical Test

作　　者：刘颖[1,2] 陈芳 邹晨阳[1,2] LIU Ying;CHEN Fang;ZOU Chenyang(Jiangxi Provincial Institute of Water Science,Nanchang 330029,Jiangxi,China;Jiangxi Provincial Research Center on Hydraulic Structures,Nanchang 330029,Jiangxi,China)

机构地区：[1]江西省水利科学研究院,江西南昌330029 [2]江西省水工安全工程技术研究中心,江西南昌330029

出　　处：《水力发电》2019年第12期113-116,共4页Water Power

基　　金：江西省水利厅科技项目(KT201514、201821ZDKT24、201820ZDKT03、KT201715)

摘　　要：某开挖岩质边坡后缘裂缝随时间推移逐渐增加,选取边坡表面出露的砂岩试样,通过干燥与饱和状态下单轴蠕变力学试验,比较不同含水状态下岩石瞬时应变、蠕变应变、总应变变化情况,分析其蠕变速率及长期强度变化特征。结果表明,在不同应力作用下,该类砂岩饱和状态下的应变均大于干燥状态,干燥和饱和砂岩的蠕变应变差异最大,比值范围为20%~31%;受水的作用影响,饱和试样蠕变长期强度较干燥试样下降28.6%,应加强工程施工及运行过程中降雨量及径向蠕变的监测。The cracks at the trailing edge of an excavated rock slope increase gradually with time.The sandstone samples exposed on the surface of the slope are selected,and the uniaxial creep mechanics tests under dry and saturated conditions are carried out to compare the change rules of instantaneous strain,creep strain and total strain of rock under different water-content conditions and analyze the creep rate and long-term strength variation characteristics.The results show that,(a)under different stresses,the strain of sandstone under saturated state is larger than under dry state,and the creep strains of the dry and saturated sandstones has larger difference with a ratio range of 20%~31%;and(b)the long-term strength of creep of saturated samples is 28.6%lower than that of dry samples as the action of water,so the monitoring of rainfall and radial creep during construction and operation period should be strengthened.

关 键 词：岩石力学 蠕变 砂岩 长期强度 

分 类 号：TU459.1[建筑科学—岩土工程]