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Determination of rock resistant coefficient based on Mohr-Coulomb criterion for underwater tunnel

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第9期9卷 1239-1244页

作者： Zhong-ren TU Qiang YANG Qi-ming SHEN Xiao-wen WANG State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China School of River and Ocean Engineering Chongqing.Iiaotong University Chongqing 400074 China

According to the load-structure method, the wall rock with lining can bear the load caused by the surrounding rock, and the rock resistant coefficient (RRC) is a key parameter for evaluating the capacity of this wall rock. Based on the Mohr-Coulomb yield criterion, this paper develops a formula for calculating the RRC, which has been applied to the real engi-neering project, such as Xiamen Xiang’an East Passage underwater tunnel Project. The fact shows that this formula is helpful for designers to determine the RRC value.

关键词： Rock resistant coefficient (RRC) Mohr-Coulomb yield criterion Rock mechanics underwater tunnel

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Typical underwater tunnels in the Mainland of China and Related tunneling Technologies

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Engineering 2017年第6期3卷 871-879页

作者： Kairong Hong State Key Laboratory of Shield Machine and Boring Technology China Railway Tunnel Group Co. Ltd. Zhengzhou 450001 China

In the past decades, many underwater tunnels have been constructed in the mainland of China, and great progress has been made in related tunneling technologies. This paper presents the history and state of the art of underwater tunnels in the mainland of China in terms of shield-bored tunnels, drill-and-blast tunnels, and immersed tunnels. Typical underwater tunnels of these types in the mainland of China are described, along with innovative technologies regarding comprehensive geological prediction, grouting-based consolidation, the design and construction of large cross-sectional tunnels with shallow cover in weak strata, cutting tool replacement under limited drainage and reduced pressure conditions, the detection and treatment of boulders, the construction of underwater tunnels in areas with high seismic intensity, and the treatment of serious sedimentation in a foundation channel of immersed tunnels. Some suggestions are made regarding the three potential great strait-crossing tunnels-the Qiongzhou Strait-Crossing tunnel, Bohai Strait-Crossing tunnel, and Taiwan Strait-Crossing tunnel--and issues related to these great strait-crossing tunnels that need further study are proposed.

关键词： underwater tunnel Strait-crossing tunne Shield-bored tunnel Immersed tunnel Drill and blast

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Seepage flow around twin circular tunnels in anisotropic ground revealed by an analytical solution

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Underground Space 2023年第3期10卷 1-14页

作者： Fengran Wei Huaning Wang Guangshang Zeng Mingjing Jiang School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China School of Urban Construction and Safety Engineering Shanghai Institute of TechnologyShanghai 201418China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

A new analytical solution is proposed for steady seepage flow around twin circular tunnels in fully saturated anisotropic *** solution is an exact one that fully satisfies all the boundary conditions and precisely considers the different permeabilities along two direc-tions and the interactions between twin *** solution provides a fast approach for the estimation of the seepage field and a useful tool for design *** solution is successfully addressed using problem equivalence and the Schwartz alternating method com-bined with a mapping *** a coordinate transformation of the governing equation,the anisotropic problem of circular tunnels is first equivalent to that of isotropic elliptical tunnels,and the length of the ellipse along the anisotropic axis depends on the anisotropic permeability *** Schwartz alternating method is then employed to address the solution of equivalent elliptical twin tunnel prob-lems,where a mapping function,with which an elliptical tunnel in the half-plane can be mapped into an annulus in the image plane,is introduced to solve the single tunnel problems in each iterative *** iterative procedure is quite simple and efficient in its calculations and achieves good convergence,and the analytical solution agrees very well with the numerical results to reflect its high precision in the entire ***,parametric studies are performed to investigate the influences of the anisotropic permeability and tunnel spacing on the seepage *** is the first study to provide the exact analytical solution of the seepage field of twin tunnel problems in aniso-tropic ground,and the procedure can be extended to multiple tunnel problems.

关键词： underwater tunnel Seepage field Anisotropy Schwartz alternating method Conformal mapping method

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