新旗下营隧道塌方段治理措施优化设计  

Optimization design of treatment measures for collapse section of Xinqixiaying tunnel

作　　者：李忠 韩炀[1,2] 陈家征 张海东 LI Zhong;HAN Yang;CHEN Jiazheng;ZHANG Haidong(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043

出　　处：《甘肃科学学报》2024年第2期75-82,109,共9页Journal of Gansu Sciences

摘　　要：为了在隧道塌方地段能够保证施工安全进行,需要采取超前支护手段来保证围岩稳定。以新旗下营隧道塌方段为依托,研究不同支护措施对隧道塌方段的影响,根据现场塌方情况比选出合适的支护方式——超前小导管,采用Midas GTS NX(迈达斯)有限元软件,分别建立了无超前支护和超前小导管支护方案进行比选分析。在此基础上,对超前小导管长度和注浆加固区厚度参数进行优化比选。结果表明:超前小导管支护效果明显,能有效改善断层破碎带和地形偏压对隧道的影响,并且当超前小导管长度为4 m,注浆加固区厚度为1 m时,可有效控制围岩变形,保证围岩稳定。研究验证了参数选取的可行性,可为类似隧道塌方的预防与治理提供工程借鉴。In order to ensure the safety of construction in tunnel collapse section,it is necessary to adopt advanced support means to ensure the stability of surrounding rock.Based on the collapse section of Xinqixiaying tunnel,the influence of different supporting measures on the tunnel collapse section is studied.According to the ratio of field collapse conditions,the appropriate supporting mode-small advance conduit is selected.Midas GTS NX finite element software is used to establish the support schemes without advance support and small advance conduit respectively for comparison analysis.On this basis,the parameters of the length of the advanced small conduit and the thickness of the grouting reinforcement area are optimized and compared.The results show that when the length of the advanced small conduit is 4 m and the thickness of the grouting reinforcement area is 1 m,the deformation of surrounding rock can be effectively controlled and the stability of surrounding rock can be ensured,which verifies the feasibility of parameter selection.The study can provide engineering reference for the prevention and treatment of similar tunnel collapse.

关 键 词：隧道塌方 治理措施 超前小导管 数值模拟 参数优化 

分 类 号：U455.7[建筑科学—桥梁与隧道工程]