深部巨跨洞室埋深及断面形态参数敏感性分析  

Sensitivity Analysis of Burial Depth and Section Shape Parameters of Giant-span Cavern in Deep Ground

作　　者：付崔伟 刘小刚[1] 吉艳雷[1] 张秦 FU Cuiwei;LIU Xiaogang;JI Yanlei;ZHANG Qin(China Railway First Survey and Design Institute Group Co.Ltd,Xi’an,Shaanxi 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2024年第12期94-100,共7页Journal of Railway Engineering Society

基　　金：中国铁建股份有限公司科研计划课题(2021-B16);国家重点研发计划项目(2023YFB2603900)。

摘　　要：研究目的:巨跨洞室围岩稳定性与受力变形特性不同于常规隧道,研究其失稳判据及围岩变形破坏的影响因素具有重要理论意义与工程应用价值。本文依托某巨跨洞室工程,采用数值模拟研究埋深、拱部矢高、仰拱矢高等影响因素对洞室稳定性的影响;基于正交试验,对影响因素进行参数敏感性分析。研究结论:(1)深部巨跨洞室围岩失稳判据宜采用塑性区贯通或特征点位移突变;(2)埋深不仅影响洞室围岩变形的大小,还影响变形的分布规律;(3)拱部矢高和仰拱对围岩变形的影响随着埋深的增加逐渐增强;(4)围岩变形和塑性区面积最大的影响因素为洞室埋深,其次为拱部矢高,仰拱矢高影响最小;(5)本研究成果可为深部巨跨扁平洞室的设计与施工提供参考和借鉴。Research purposes:The stability and deformation characteristics of surrounding rock of giant-span caverns are different from those of conventional tunnels.It is of great theoretical significance and engineering application value to investigate the instability criterion and the influencing factors of surrounding rock deformation and failure.In this paper,based on a giant-span cavern project,the influence of burial depth,arch vector height and inverted arch vector height on the stability of cavern are investigated by numerical simulation.Based on the orthogonal experiment,the parameter sensitivity analysis of influencing factors is carried out.Research conclusions:(1)The instability criterion of surrounding rock of giant-span caverns in deep ground should adopt plastic zone penetration or displacement mutation of characteristic points.(2)The burial depth affects not only the deformation of the surrounding rock of the cavern,but also the deformation distribution.(3)The influence of the arch vector height and the inverted arch on the deformation of the surrounding rock gradually increases with the increase of the burial depth.(4)The largest influencing factor on the surrounding rock deformation and plastic zone area is the burial depth of cavern,followed by the arch vector height,and the inverted arch vector height has the least influence.

关 键 词：深埋洞室 巨跨洞室 围岩稳定性 失稳判据 参数敏感性 正交试验 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]