长江科学院院报2018，Vol.35Issue(3)：6-12,7.DOI:10.11988/ckyyb.20171136
冻结岩石节理面峰值剪切强度准则研究
Peak Shear Strength Criteria for Frozen Rock Joint Surface
摘要
Abstract
In permafrost region,rock joint as a mechanical weakness has great influence on the safety and durability of engineering projects. Studying the mechanical properties of frozen rock is of great significance for engineering construction in permafrost regions.To investigate the shear mechanical performance of frozen rock joints,four sets of natural joint surfaces of tuff collected from G214 National Highway in Qinghai Province were selected for direct shear test after being frozen at given temperature. Results show that the peak strength of the frozen rock joint is pro-portional to normal stress,and is inversely proportional to opening degree and roughness. When the opening of joint surface is greater than the maximum fluctuation of joint, the joint surface is dominated by disconnection failure mode,and the peak shear strength is controlled by adhesive force between ice and contact surface;when the open-ing of joint surface is smaller than the maximum fluctuation,ice shearing failure is the dominant failure mode under small normal stress;while under large normal stress,shearing failure of ice and rock both exist,and the peak shear strength is determined by the shear strength of both ice and rock joint. Furthermore,the peak shear strength criteria for frozen rock joints with various failure modes were derived.关键词
冻结岩石节理面/峰值剪切强度/张开度/粗糙度/强度准则/破坏形式Key words
frozen rock joint/peak shear strength/opening degree/roughness/strength criteria/failure form分类
建筑与水利引用本文复制引用
沈世伟,韩亚鲁,徐燕,李火华..冻结岩石节理面峰值剪切强度准则研究[J].长江科学院院报,2018,35(3):6-12,7.基金项目
国家自然科学青年基金项目(41502270,41502322) （41502270,41502322）
吉林省科技发展计划项目(20150520076JH) （20150520076JH）
中国科学院冻土工程国家重点实验室开放基金项目(SKLFSE201506) （SKLFSE201506）
