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作 者:任洋 吴岳华[1,2] 李天斌 REN Yang;WU Yuehua;LI Tianbin(College of Environmental and Civil Engineering,Chengdu University of Technology,Chengdu 610059,Sichuan,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,Sichuan,China)
机构地区:[1]成都理工大学环境与土木工程学院,四川成都610059 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059
出 处:《隧道建设(中英文)》2023年第11期1908-1915,共8页Tunnel Construction
基 金:国家自然科学基金(42130719,U19A20111);四川省自然科学基金(2022NSFSC0411);地质灾害防治与地质环境保护国家重点实验室自主研究课题(SKLGP2021Z011)。
摘 要:为快捷高效地获得隧道轴线地应力,满足工程实际使用需求,构建一种基于地质统计克里金法的深埋长隧道初始地应力插值计算方法。首先,采用交叉验证迭代计算出各误差指标,在3种变异函数模型中选出最优函数模型用于地应力插值计算,获得隧道剖面的主应力量值及最大水平主应力方向;然后,考虑不同地层和断层的影响,对隧道洞轴线主应力结果进行修正,获得隧道洞轴线主应力量值及最大水平主应力方向。该方法以少量的地应力实测数据为基础,不受隧道勘察资料和工程线路方案调整等影响,可快捷高效地获得隧道轴线地应力量值及方向。通过工程应用表明:1)该方法的计算值与实测地应力值拟合精度较高,其中最大水平主应力拟合度约85%;2)通过插值计算获得了隧道洞轴线主应力量值及最大水平主应力方向,隧道最大水平主应力达52.50 MPa,隧道主应力方位以NW向为主,局部段为NE向。To quickly and efficiently obtain the in-situ stress of the tunnel axis to meet the practical engineering demands,an initial in-situ stress interpolation calculation method for a deep-buried long tunnel is established based on the geological statistical Kriging method.The cross-validation iteration is used to calculate each error indicator.The optimal function model is selected from various variogram models for geostress interpolation calculation to obtain the principal stress value and maximum horizontal principal stress direction of the tunnel section.Next,considering the influence of different strata and faults,the principal stress results of the tunnel axis are corrected to obtain the principal stress value and tunnel axis direction.The proposed method,based on a small amount of in-situ stress measurement data,is not affected by tunnel survey data and engineering route plan adjustments,resulting in quickly and efficiently obtaining in-situ stress value and tunnel axis direction.The engineering application shows that:(1)The calculation value of the proposed method has high fitting accuracy with the measured in-situ stress value with a fitting degree of approximately 85%for the maximum horizontal principal stress.(2)The principal stress values of the tunnel axis and the maximum horizontal principal stress direction were obtained through interpolation.The maximum horizontal principal stress of the tunnel was 52.50 MPa,and the principal stress direction of the tunnel was primarily in the NW direction,with local sections in the NE direction.
分 类 号:U455.43[建筑科学—桥梁与隧道工程]
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