摘要
为了研究冻融循环对隧道围岩损伤特性,以青海省在建砂岩隧道为研究对象,开展不同冻融循环次数下砂岩物理力学特性及微观研究,分析了不同冻融次数不同围压下砂岩损伤特性的变化规律,并结合微观试验对结果进行说明。研究表明:冻融循环会使砂岩明显劣化,随着冻融循环次数的增加,砂岩的质量、波速、抗压强度、粘聚力、摩擦角及弹性模量呈递减趋势,砂岩孔隙增多,孔径增加,而围压可以抑制砂岩的劣化;通过数值模拟发现,冻融循环会使砂岩隧道产生一定的位移。研究结果对寒区砂岩隧道的施工、运营具有重要意义。
In order to study the damage characteristics of freeze-thaw cycles on the surrounding rock of tunnels,taking the sandstone tunnel under construction in Qinghai Province as the research object,the physical and mechanical characteristics and microscopic research of sandstone under dfferent freeze-thaw cycles were carried out,and the changes of sandstone damage characteristics under different freeze-thaw times and confining pressures were analyzed,and the results were explained by microscopic experiments.The results show that the freeze-thaw cycle has obvious deterioration of sandstone,and with the increase of the number of freeze-thaw cycles,the quality,wave velocity,compressive strength,cohesion,friction angle and elastic modulus of sandstone show a decreasing trend,the pores of sandstone increase,the pore size increases,and the confining pressure can inhibit the deterioration of sandstone.Through numerical simulation,it is found that the freeze-thaw cycle will cause a certain displacement of the sandstone tunnel.The research results are of great significance for the construction and operation of sandstone tunnels in cold regions.
作者
叶远程
房建宏
王青志
Ye Yuancheng;Fang Jianhong;Wang Qingzhi(School of Civil Engineering,Qinghai University,Xining 810016,China)
出处
《青海交通科技》
2023年第4期112-119,158,共9页
Qinghai Transportation Science and Technology
基金
国家自然科学基金资助项目(41801046)
青海省省级科技计划项目(2023-QY-206)。
关键词
冻融循环
砂岩隧道
物理力学特性
劣化
围压
freeze-thaw cycle
sandstone tunnels
physical and mechanical properties
deterioration
Confining pressure
作者简介
叶远程(1999-),男,硕士,主要研究方向:交通材料。
