软弱黄土隧道支护结构力学特性测试 = Mechanical characteristic test of tunnel support structure in weak loess stratum

为研究软弱黄土隧道支护结构的受力特性,优化黄土隧道设计理论,以西宁过境高速公路某黄土隧道为依托,选取杂填土段、深埋段和浅埋段进行了大规模的现场测试,从支护受力的空间分布、时间分布、计算方法以及对比验证等方面,对围岩与初支接触压力、初支与二衬接触压力及二衬和仰拱混凝土的应变进行了系统的研究。分析结果表明:拱顶、拱肩处的压力值较大,是黄土隧道最危险的部位,容易发生坍塌;围岩压力计算值与实测值相差较大,现有方法在计算黄土断面围岩压力时存在较大的误差;深埋段围岩压力稳定时间最短,浅埋段次之,杂填土段时间最长;软弱黄土隧道“新奥法”原理指导下,“强初支,弱二衬”设计理念的采用,使二衬荷载承担比例控制在1...

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Bibliographic Details
Main Authors: 赖金星 Lai Jin-xing, 王开运 Wang Kai-yun, 来弘鹏 Lai Hong-peng, 邱军领 Qiu Jun-ling, 谢永利 Xie Yong-li
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:Chinese
Published: 2020
Subjects:
Online Access:http://transport.chd.edu.cn/oa/DArticle.aspx?type=view&id=201503006
https://hdl.handle.net/10356/137023
http://http://transport.chd.edu.cn/oa/DArticle.aspx?type=view&id=201503006
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Institution: Nanyang Technological University
Language: Chinese