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机构地区:[1]广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004
出 处:《地下空间与工程学报》2014年第4期789-793,共5页Chinese Journal of Underground Space and Engineering
基 金:国家自然科学基金资助项目(51068004);广西岩土力学与工程重点实验室基金资助项目(11-CX-03)
摘 要:隧道开挖使得围岩应力重分布而产生拱效应,拱效应的作用范围与隧道支护结构设计的安全储备以及经济性密切相关,并且一直都是岩土工程界的一个重要研究课题。作者根据相似原理,选用中砂为实验材料,采用卸载支护压力模拟隧道开挖。通过实测不同支护力条件下洞周土体径向和环向的土压力数据,分析了土拱拱体在不同支护作用下的发展变化规律,结果表明:压力拱拱体内外边界随着支护压力的减小而不断扩大,最终达到厚度为1.3倍洞径左右的稳定压力拱拱体。研究结果对地下"洞"室的开挖以及衬砌设计具有参考意义。The excavation of tunnel caused stress redistribution of surrounding rock resulting in arch effect,the scope of arch effect was closely related to safety and economy of tunnel support structure design,and has been an important research topic in the field of geotechnical engineering. According to the similarity principle,the medium sand was selected as experimental material,using the unloading support pressure to simulate the tunnel excavation.Through the measurement of radial and circumferential pressure data of soil around the tunnel under different support force,an analysis on the development and changes law of the soil arch under different support action is carried out,the results show that: the pressure arch boundary was expanding with the support pressure and finally reached the stable pressure arch with the thickness 1. 3 times the diameter of tunnel. The research results have reference significance to the underground tunnel and chamber excavation and lining design.
分 类 号:U451.2[建筑科学—桥梁与隧道工程]
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