四川大学学报：工程科学版2011，Vol.43Issue(5)：64-70,101,8.
大岗山水电站坝区辉绿岩流变特性的三轴试验研究
Triaxial Test Research into Rheological Properties of Diabase in Dagangshan Hydropower Station Dam Site
摘要
Abstract
In order to study the long-term mechanical properties of the diabase in Dagangshan hydropower station dam site,triaxial rheological tests under different stress paths were carried out on RLW-1000 rheology testing machine,and the stress-strain-time curves under different conditions were obtained.The results showed that the diabase was typical hard-brittle rock which had obvious rheological threshold,and sudden brittle fracture was shown at failure of specimen.Shortly prior to failure,each specimen experienced transient creep,steady-state creep and tertiary creep stage in the fracture stress level,but the transient creep and tertiary creep stage maintained short time.When the applied stress level was closed to the fracture stress,the circumferential creep rates were higher than those of axial,which were the main reason of the volume dilatancy phenomenon of specimen.The continuous development of damage in rheological process caused the decrease of whole strength of rock mass,so the rheological failure strength was lower than the instantaneous failure strength by the triaxial compression test.There was some degree of alteration in the diabase of Dagangshan hydropower station dam site,and the altered minerals showed fine scale-like aggregation.The strength of rock was impaired by the existence of alerted strip,the rupture of rock can occur easily in the interface of poorly crystallized mineral grains and the poorly cemented ones.关键词
流变试验/辉绿岩/三轴流变/流变破裂机制/硬脆岩体Key words
rheology experiment/diabase/triaxial rheology/rheological failure mechanism/hard-brittle rock分类
建筑与水利引用本文复制引用
杨文东,张强勇,陈芳,李术才,李文纲,王建洪,贺如平,曾纪全,张功实..大岗山水电站坝区辉绿岩流变特性的三轴试验研究[J].四川大学学报：工程科学版,2011,43(5):64-70,101,8.基金项目
国家重点基础研究发展计划资助项目 （）
国家自然科学基金资助项目 （）
教育部新世纪优秀人才支持计划资助项目 （）
