沪昆客运专线报信山隧道工程地应力测试及应用
|
摘要
基于报信山隧道水压致裂地应力量测结果,分析了隧道区地应力特征、最大主应力方向;结合最大主应力大小及方向分析不同隧道轴线方位的围岩稳定性,为隧道轴线方位、隧道断面形状的选择提供可靠的科学依据。通过隧道区应力特征分析,确定隧道区以水平应力为主,最大水平主应力量值为12 MPa,最大主应力方向为NW向。根据最大主应力方向,线路方案局部优化,舍弃老屯设站方案;最大主应力方向与隧道轴线方向基本垂直,对隧道洞室稳定性不利,但隧道断面采取1∶1.2的椭圆形开挖形状,可弥补隧道走向对洞室围岩稳定所带来的不利因素;结合隧道区工程地质条件,认为发生岩爆等地质灾害的概率很小。
Based on the measurement of geostatic stress caused by hydraulic fracture in Baoxinshan-tunnel,the stress characteristics in tunnel area and the direction of maximum principal stress is discussed.Combined with the geostatic stress value in tunnel area and the direction of maximum principal stress,the stability of the tunnel surrounding rock is analyzed.The reliable scientific basis is provided for the determination of direction of the tunnel axis and the choice of tunnel cross-section form.Through analysis of the stress characteristics in tunnel area,horizontal stress is confirmed as the maximum principal stress which has a value of 12 MPa and has NW direction as its maximum principal stress direction.On the basis of this result,the line scheme is optimized by abandoning Laotung station scheme.The maximum principal stress direction and the direction of tunnel axis are substantially perpendicular,unfavorable for tunnel stability,but the cross section of the tunnel is excavated in 1∶ 1.2 oval shape,which makes up the unfavorable factors on cavern surrounding rock stability caused by tunnel direction;Under such a geology condition in the tunneling,geological disasters like rock burst are minimized.
Based on the measurement of geostatic stress caused by hydraulic fracture in Baoxinshan-tunnel,the stress characteristics in tunnel area and the direction of maximum principal stress is discussed.Combined with the geostatic stress value in tunnel area and the direction of maximum principal stress,the stability of the tunnel surrounding rock is analyzed.The reliable scientific basis is provided for the determination of direction of the tunnel axis and the choice of tunnel cross-section form.Through analysis of the stress characteristics in tunnel area,horizontal stress is confirmed as the maximum principal stress which has a value of 12 MPa and has NW direction as its maximum principal stress direction.On the basis of this result,the line scheme is optimized by abandoning Laotung station scheme.The maximum principal stress direction and the direction of tunnel axis are substantially perpendicular,unfavorable for tunnel stability,but the cross section of the tunnel is excavated in 1∶ 1.2 oval shape,which makes up the unfavorable factors on cavern surrounding rock stability caused by tunnel direction;Under such a geology condition in the tunneling,geological disasters like rock burst are minimized.
引文
[1]李飞,王述红,李正仁,等.地应力水压致裂法测量及其在隧道工程的应用[J].西部探矿工程,2009(4):178-181.LI Fei,WANG Shuhong,LI Zhengren,et al.Hydro-fracturing Geostatic Stress Measurement and its Application in Tunnel Engineering[J].West-China Exploration Engineering,2009(4):178-181.
[2]陈荣魁.水压致裂地应力测量在福宁高速公路赤岭隧道工程中的应用[J].公路交通技术,2004(2):71-74.CHEN Rongkui.Hydro-fracturing Geostatic Stress Measurement and Application in Chiling Tunnel on Fu Ning Expressway[J].Technology of Highway and Transport,2004(2):71-74.
[3]李兵,毛吉震,郭啟良.沪昆线贵州段报信山隧道地应力测试[R].北京:中国地震局地壳应力研究所,2010.LI Bing,MAO Jizhen,GUO Qiliang.Geostatic Stress Measurement of Baoxinshan Tunnel in Guizhou Section on Shanghai-Kunming Railway[R].Beijing:Institute of Rustal Danamics,China Seismological Bureau,2010.
[4]李金锁,彭华,崔巍,等.云南西北部铁路隧道地应力测试及工程应用[J].地质力学学报,2005(2):135-144.LI Jinsuo,PENG Hua,CUI Wei,et al.Geostatic Stress Measurement and Engineering Application of Railway Tunnels in Northwest of Yunnan[J]Journal of Geomechanics,2005(2):135-144.
[2]陈荣魁.水压致裂地应力测量在福宁高速公路赤岭隧道工程中的应用[J].公路交通技术,2004(2):71-74.CHEN Rongkui.Hydro-fracturing Geostatic Stress Measurement and Application in Chiling Tunnel on Fu Ning Expressway[J].Technology of Highway and Transport,2004(2):71-74.
[3]李兵,毛吉震,郭啟良.沪昆线贵州段报信山隧道地应力测试[R].北京:中国地震局地壳应力研究所,2010.LI Bing,MAO Jizhen,GUO Qiliang.Geostatic Stress Measurement of Baoxinshan Tunnel in Guizhou Section on Shanghai-Kunming Railway[R].Beijing:Institute of Rustal Danamics,China Seismological Bureau,2010.
[4]李金锁,彭华,崔巍,等.云南西北部铁路隧道地应力测试及工程应用[J].地质力学学报,2005(2):135-144.LI Jinsuo,PENG Hua,CUI Wei,et al.Geostatic Stress Measurement and Engineering Application of Railway Tunnels in Northwest of Yunnan[J]Journal of Geomechanics,2005(2):135-144.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心