基于超前地质预报的隧道围岩稳定性靶向数值模拟研究
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摘要
针对TSP超前地质预报技术的不足,通过对反射波信息的精细分析,结合地质勘查资料及现场施工情况,并通过TSP反射信息获取前方岩体部分力学参数,对隧道围岩的稳定性进行靶向超前数值模拟计算,对比分析不同施工工法下的围岩位移变化特征、塑性区及孔隙水压分布情况。结果表明,相较于二台阶法,三台阶法施工的围岩拱顶下沉、净空收敛及塑性区分布等均较小,二台阶法施工的围岩变化位移亦在规范允许范围之内,围岩状况稳定,对隧道高风险段施工工法转换及围岩稳定性的超前分析有一定的参考价值。
Aiming at the shortcomings of TSP advanced geology forecast technology,the careful analysis of reflected wave information was conducted.Then,combined with geological survey data and on-site construction conditions,the some mechanical parameters of rock mass in front of the tunnel were obtained by TSP reflection information.After that,the targeted numerical simulation calculation on the stability of tunnel surrounding rock was conducted.And the displacement characteristics,plastic zone distribution and pore water pressure distribution of surrounding rock were compared and analyzed under different construction methods.The results showed that compared with two-step method,three-step method used for construction had the advantages of small vault subsidence,headroom convergence and plastic zone distribution.However,the displacement change of surrounding rock under the construction of two-step method was also within allowable scope of criterion,and the surrounding rock condition was stable.Therefore,the study had a certain reference value for the construction method transformation at the high-risk section of tunnel and the advanced analysis of surrounding rock stability.
Aiming at the shortcomings of TSP advanced geology forecast technology,the careful analysis of reflected wave information was conducted.Then,combined with geological survey data and on-site construction conditions,the some mechanical parameters of rock mass in front of the tunnel were obtained by TSP reflection information.After that,the targeted numerical simulation calculation on the stability of tunnel surrounding rock was conducted.And the displacement characteristics,plastic zone distribution and pore water pressure distribution of surrounding rock were compared and analyzed under different construction methods.The results showed that compared with two-step method,three-step method used for construction had the advantages of small vault subsidence,headroom convergence and plastic zone distribution.However,the displacement change of surrounding rock under the construction of two-step method was also within allowable scope of criterion,and the surrounding rock condition was stable.Therefore,the study had a certain reference value for the construction method transformation at the high-risk section of tunnel and the advanced analysis of surrounding rock stability.
引文
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[11]刘新荣,刘永权,杨忠平,等.基于地质雷达的隧道综合超前预报技术[J].岩土工程学报,2015,37(S2):51-56.
[12]彭璟,刘彤,张为民.台阶法施工隧道结构受力性状有限元分析[J].路基工程,2009(05):121-122.
[13]王梦恕.隧道工程浅埋暗挖法施工要点[J].隧道建设,2006(05):1-4.
[2]李术才,刘斌,孙怀凤,等.隧道施工超前地质预报研究现状及发展趋势[J].岩石力学与工程学报,2014,33(06):1090-1113.
[3]廖艳程,欧阳锋,易志强,等.综合超前地质预报方法在岩溶隧道施工中的应用[J].矿业研究与开发,2017,37(02):102-105.
[4]李术才,薛翊国,张庆松,等.高风险岩溶地区隧道施工地质灾害综合预报预警关键技术研究[J].岩石力学与工程学报,2008,27(07):1297-1307.
[5]聂莉萍,侯俊敏,毛梦芸,等.基于探地雷达的巷道超前地质预报二维正演模拟[J].矿业研究与开发,2016,36(06):104-107.
[6]雷亚妮,杜立志,张晓培,等.TSP24隧道超前地质预报系统及其应用[J].华北地震科学,2013,31(04):41-46.
[7]干昆蓉,蒋肃.对隧道施工地质超前预报工作的反思与探讨[J].铁道工程学报,2007(09):9-13.
[8]刘阳飞,李天斌,孟陆波,等.提高TSP预报准确率及资料快速分析方法研究[J].水文地质工程地质,2016,43(02):159-166.
[9]宋先海,顾汉明,肖柏勋.我国隧道地质超前预报技术述评[J].地球物理学进展,2006(02):605-613.
[10]袁永才,李术才,李利平,等.岩溶隧道施工过程中大型溶洞的综合预报及治理方案研究[J].现代隧道技术,2015,52(02):192-197.
[11]刘新荣,刘永权,杨忠平,等.基于地质雷达的隧道综合超前预报技术[J].岩土工程学报,2015,37(S2):51-56.
[12]彭璟,刘彤,张为民.台阶法施工隧道结构受力性状有限元分析[J].路基工程,2009(05):121-122.
[13]王梦恕.隧道工程浅埋暗挖法施工要点[J].隧道建设,2006(05):1-4.
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