深埋高地应力隧道不同支护时机求解方法对比研究  

Comparative Analysis of Results of Various Methods to Determine Reasonable Support Timings of Deep-Buried Tunnels with High Ground Stress

作　　者：蒋长伟 陈子全[1] 汪波[1] 李天胜 周子寒[1] 包烨明 JIANG Changwei;CHEN Ziquan;WANG Bo;LI Tiansheng;ZHOU Zihan;BAO Yeming(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;China Railway 12th BureauGroup Co.,Ltd.,Taiyuan 030024,Shanxi,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]中铁十二局集团有限公司,山西太原030024

出　　处：《隧道建设（中英文）》2023年第1期119-130,共12页Tunnel Construction

基　　金：国家自然科学基金项目(52008351);中国博士后科学基金资助项目(2020TQ0250);四川省交通运输科技项目(2021-B-01);四川省科技计划资助项目(2021YJ0539)。

摘　　要：为确定深埋高地应力隧道的合理支护时机,提高支护结构质量,降低支护成本,依托某高原深埋高地应力隧道,采用安全系数法、位移增量法和塑性区法分别求解支护结构的合理支护时机,并对比分析不同支护时机求解方法的适用性。结果表明:1)3种求解方法计算得到的洞壁屈服分布规律是一致的,均呈现出拱顶和仰拱比拱腰和拱脚更容易发生屈服的规律;2)不同支护时机求解方法的求解结果不同,在同等埋深下,采用安全系数法计算得到的安全距离大于采用塑性区法和位移增量法计算得到的安全距离;3)通过工程类比法发现,采用安全系数法求解支护时机更为合理,而塑性区法和位移增量法相对于安全系数法过于保守。To rationally determine the support timing of deep-buried tunnels with high ground stress, improve the support structure quality, and reduce the support cost, a case study is conducted on a deep-buried plateau tunnel with high ground stress. Safety factor, displacement increment, and plastic zone methods are employed to determine the reasonable support timing of the support structure, and the applicability of each method is analyzed and compared. The results reveal the following.(1) The distribution laws of cave wall yield calculated by the three methods agree, it is easier to yield at the crown and invert than at the waist and foot.(2) The results of support timings by the various methods differ;under the same buried depth, the safety distance obtained by the safety factor method is greater than that obtained by the plastic zone and displacement increment methods. The engineering analogy shows that the plastic zone and displacement increment methods are more conservative than the safety factor method;thus, the safety factor method is recommended when determining the support timing.

关 键 词：深埋高地应力隧道 支护时机 安全系数法 位移增量法 塑性区法 

分 类 号：U45[建筑科学—桥梁与隧道工程]