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Reliability assessment of deep excavations in spatially random cohesion weakening friction strengthening massive rocks:Application to nuclear repositories

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Underground Space 2023年第6期13卷 48-73页

作者： Akshay Kumar Gaurav Tiwari Department of Civil Engineering Indian Institute of Technology KanpurKanpurUttar Pradesh 208016India

An augmented methodology is developed to estimate the reliability of deep excavations along spatially variable massive rock masses using the cohesion weakening friction strengthening(CWFS)*** parameters of the CWFS model were initially identified using Sobol’s global sensitivity analysis based on their influence on the displacements and excavation damage zone around *** probability of failure was estimated by performing Mont–Carlo Simulations on random finite difference models of excavations generated via MATLAB-FLAC2D coupling,considering the spatial variation of these sensitive *** variation was modeled by generating anisotropic random fields of sensitive CWFS parameters via the recently developed Fourier series method and updated correlations suggested by Walton(2019).The proposed methodology was demonstrated for a proposed deep nuclear waste repository to be located in *** from the developed methodology were systematically compared with those of traditional reliability(ignoring spatial variation)and deterministic methods(ignoring uncertainty).Although the developed methodology was computationally complex,it was judged to be the most realistic due to the realistic consideration of heterogeneous distributions of rock *** methodologies underestimate/overestimate the excavation performance due to negligence of uncertainty and spatial ***,a parametric analysis was performed using developed methodology by varying the initial friction angle,scale of fluctuations(SOFs)and dilation *** effect of initial friction angle was observed to be more pronounced on the probability of failures as compared to SOFs and dilation *** observations were made related to the excavation damage zone(EDZ)development quantified using yield area ratio.

关键词： deep excavations Brittle failures CWFS model Sobol’s sensitivity Moving least square response surface Fourier series random field

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Responses of the Strata and Supporting System to Dewatering in deep excavations

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Journal of Shanghai Jiaotong university(Science) 2017年第6期22卷 705-711页

作者：肖潇张扬清李明广王建华 School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In order to prevent the inrushing caused by deep excavations, dewatering measure has to be adopted to decrease the confined water level. In this study, the responses of the strata and supporting system to dewatering in deep excavations are investigated through numerical simulations and case studies. Coupled fluid-mechanical analyses are performed by the use of the numerical software, FLAC3 D. The responses of the ground settlement,base heave and interior columns to the excavation and dewatering are analyzed. Numerical results indicate that the dewatering measure can effectively reduce the uplift of the subsurface soil in the excavation, and decrease the vertical displacement of the supporting system. In addition, field data of two case histories show the similar responses and confirm the validation of the numerical results. Based on the analyses, dewatering in the confined aquifer is recommended as a construction method for controlling the vertical displacement of the strata and supporting system in deep excavations.

关键词： deep excavations column confined water numerical simulation dewatering measure

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Advanced finite element analysis of a complex deep excavation case history in Shanghai

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Frontiers of Structural and Civil Engineering 2014年第1期8卷 93-100页

作者： Yuepcng DONG Harvey BURD Guy HOULSBY Yongmao HOU University of OxJord OxJord OX1 2JD UK Shanghai Tunnel Engineering Co LTD Shanghai 200082 China

The construction of the North Square Shopping Center of the Shanghai South Railway Station is a large scale complex top-down deep excavation project. The excavation is adjacent to several current and newly planned Metro lines, and influenced by a neighboring Exchange Station excavation. The highly irregular geometry of this excavation greatly increases the complexity in 3D Finite Element modeling. The advanced numerical modeling described in this paper includes detailed structural and geotechnical behavior. Important features are considered in the analysis, e.g., 1） the small-strain stiffness of the soil, 2） the construction joints in the diaphragm wall, 3） the shrinkage in the concrete floor slabs and beams, 4） the complex construction sequences, and 5） the shape effect of the deep excavation. The numerical results agree well with the field data, and some valuable conclusions are generated.

关键词： advanced finite element analysis deep excavations case history small-strain stiffness

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Application of Modified Genetic Algorithm to Optimal Design of Supporting Structure

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Journal of China University of Mining and Technology 2003年第2期13卷 131-135页

作者：周瑞忠潘是伟 College of Civil Engineering Fuzhou UniversityFuzhou Fujlan350002China College of Civil Engineering Fuzhou UniversityFuzhou Fujian350002China

The modified genetic algorithm was used for the optimal design of supporting structure in deep *** on the common genetic algorithm, using niche technique and reserving the optimum individual the modified genetic algorithm was presented. By means of the practical engineering, the modified genetic algorithm not only has more expedient convergence, but also can enhance security and operation efficiency.

关键词： genetic algorithm deep excavations supporting structure optimal design niche technique

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