| 考虑空间变异性的盾构隧道地层力学响应敏感性分析 |
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| 引用本文： | 李健斌,陈健,程红战,张善凯,吴佳明,胡之锋. 考虑空间变异性的盾构隧道地层力学响应敏感性分析[J]. 岩石力学与工程学报, 2019, 0(8): 1667-1676 |
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| 作者姓名： | 李健斌 陈健 程红战 张善凯 吴佳明 胡之锋 |
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| 作者单位： | 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;中国科学院武汉岩土力学研究所湖北省环境岩土工程重点实验室;岩土力学与工程国家重点实验室宁波工程学院工程软土实验中心;湖南大学土木工程学院 |
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| 基金项目： | 国家自然科学基金资助项目(U1402231,41807512);湖北省技术创新重大项目(2017ACA186)~~ |
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| 摘 要： | 针对土体变形参数(弹性模量E、泊松比μ)、强度参数(黏聚力c、内摩擦角φ)对盾构隧道施工地层力学响应的敏感性问题,以土体参数的空间变异性为切入点,结合随机场理论、有限差分法和MonteCarlo策略,采用考虑参数空间变异性的敏感性综合评价分析方法,开展地层力学响应的参数敏感性随机分析。研究结果表明:地层力学响应对内摩擦角的空间变异性最为敏感,其次是弹性模量,然后是黏聚力,最不敏感的是泊松比;不同变异水平条件下,各参数变异性的敏感程度存在差异,参数变异水平越高,其敏感性越强;3种参数变异水平下,泊松比均为不敏感因素,随机分析中可不考虑其空间变异性对地层力学响应的影响,黏聚力在变异性较小时也为不敏感因素。
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| 关 键 词： | 隧道工程 盾构隧道 空间变异性 敏感性分析 地层力学响应 变异水平 |
Sensitivity analysis of mechanical parameters to surrounding-soil response induced by shield tunneling considering spatial variability |
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| LI Jianbin,CHEN Jian,CHENG Hongzhan,ZHANG Shankai,WU Jiaming,HU Zhifeng. Sensitivity analysis of mechanical parameters to surrounding-soil response induced by shield tunneling considering spatial variability[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 0(8): 1667-1676 |
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| Authors: | LI Jianbin CHEN Jian CHENG Hongzhan ZHANG Shankai WU Jiaming HU Zhifeng |
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| Affiliation: | (State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Hubei Key Laboratory of Geo-Environmental Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;The Soft Soil Research Center in Ningbo University of Technology,State Key Laboratory of Geomechanics and Geotechnical Engineering,Ningbo,Zhejiang 315211,China;College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China) |
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| Abstract: | Stochastic calculations,by combining the random field theory and the finite difference analysis together with Monte Carlo simulation,are used to carry out the sensitivity analysis of spatial variability of soil parameters to surrounding-soil response induced by tunneling. The effects of coefficients of variation(COV) of Young￠s modulus(E),Poisson￠s ratio(μ),cohesion(c) and friction angle(φ) on the surrounding-soil response were investigated and discussed in detail. Results show that the main influence factors on surrounding-soil response are arranged in the order of spatial variability of internal friction angle,Young￠s modulus,cohesion and Poisson￠s ratio. The higher the variation level of the parameters,the greater the sensitivity of the parameters.Additionally,the influence of spatial variability of Poisson￠s ratio on surrounding-soil response can be neglected in stochastic analysis. The influence of cohesion can be considered comprehensively according to the variation level. |
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| Keywords: | tunnelling engineering shield tunneling spatial variability sensitivity analysis surrounding-soil response variation level |
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