偏压作用下各向异性深埋软岩隧道的地应力反演  

Inversion of in-situ stress in anisotropic soft rock tunnel under deviators

作　　者：吴帮标 张浩东 于长一 刘爱民[2,3,4,5] WU Bang-biao;ZHANG Hao-dong;YU Chang-yi;LIU Ai-min(Institute of Civil Engineering,Tianjin University,Tianjin 300354,China;CCCC Tianjin Port Engineering Institute Co.,Ltd.,Tianjin 300222,China;CCCC First Harbour Engineering Co.,Ltd.,Tianjin 300461,China;Key Laboratory of Port Geotechnical Engineering of Ministry of Communications,Tianjin 300222,China;Key Laboratory of Port Geotechnical Engineering of Tianjin,Tianjin 300222,China)

机构地区：[1]天津大学建筑工程学院,天津300354 [2]中交天津港湾工程研究院有限公司,天津300222 [3]中交第一航务工程局有限公司,天津300461 [4]港口岩土工程技术交通行业重点实验室,天津300222 [5]天津市港口岩土工程技术重点实验室,天津300222

出　　处：《中国港湾建设》2021年第3期7-11,共5页China Harbour Engineering

基　　金：国家自然科学基金(51709200);天津市自然科学基金(18JCQNJC08100)。

摘　　要：依托云南某新建铁路软岩隧道,开展了软岩隧道开挖扰动下的地应力分布反演研究。反演过程首先依据现有地质勘察资料,确定隧道地应力场受到偏压和各向异性的影响,随后利用有限元进行数值模拟实验,并对二者的参数值进行了标定,初步模拟出隧道断面的地应力场,结合现场少数测点在数值模拟结果的基础上利用MATLAB中的griddata函数插值对地应力场的分布进行进一步反演。将数值模拟结合griddata函数插值法所得结果与实测值进行比较,结果表明:利用有限元对地应力场的反演可以与实测值较为接近。而结合数值模拟的griddata函数法对地应力场的计算精度较高,具有一定的参考价值,能够给实际工程做出相应的指导。Based on a new railway soft rock tunnel in Yunnan,the inversion study of the in-situ stress distribution under the excavation disturbance of the soft rock tunnel was carried out.It is first determined that the in-situ stress field of the tunnel is affected by the deviators and anisotropy based on the existing geological survey data.Then,the numerical simulation was conducted using finite element method,subsequently the parameter values of the two influencing factors are calibrated.And then the in-situ stress field of the tunnel section is preliminarily simulated.Finally,the griddata function in MATLAB is used to further invert the distribution of in-situ stress field in combination with a few on-site measurement points.Compare the results obtained by combining numerical simulation with griddata function interpolation with the measured values,the results show that:The inversion of the in-situ stress field using finite elements can be closer to the measured value.The griddata function method combined with numerical simulation has high calculation accuracy for the in-situ stress field and has certain reference value,which can give corresponding guidance to actual projects.

关 键 词：griddata函数 地应力反演 各向异性 偏压 软岩隧道 

分 类 号：TU91[建筑科学—建筑理论]