摘要
为研究结构面的剪切应力松弛特性及应力松弛与长期强度之间的关系,选取Barton标准剖面线中的第4,6和10条作为人工模拟结构面的表面形态,并用水泥砂浆浇筑成试样,在岩石双轴流变仪上进行试验值大于剪切长期强度的循环加载剪切应力松弛试验。基于试验结果,分析结构面在剪切作用下的应力松弛速率特性,以及不同应力水平作用下的结构面应力松弛特性及循环加载条件下的结构面应力松弛特性;讨论蠕变和应力松弛之间的联系,提出通过应力松弛试验对长期强度的求解方法。该研究成果对应力松弛的认识及长期强度的试验确定方法均是一次有意义的探索,可为工程实践提供指导。
To study the characteristics of shear stress relaxation of rock with a structural plane and the connection between the stress relaxation and the long-term strength,the samples with artificial joint surfaces based on the 4th,6th,and 10th discontinuity lines from Barton′s ten standard lines were made using cement mortar. The shear stress relaxation tests under cyclic loading with the shearing loading value larger than the long-term shear strength were conducted with the biaxial rheological testing machine. The shear stress relaxation was studied based on the test results. The mechanism of interaction between the stress relaxation and the creep was discussed,and a stress relaxation method was proposed to determine the long-term strength.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第9期1916-1924,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(41072203)
高等学校博士学科点专项科研基金项目(20090072110012)
关键词
岩石力学
循环加载
应力松弛
结构面
长期强度
rock mechanics
cyclic loading
stress relaxation
discontinuity
long-term strength
