The Experts below are selected from a list of 60 Experts worldwide ranked by ideXlab platform
Tai Quan Zhou - One of the best experts on this subject based on the ideXlab platform.
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application study of polypropylene fiber reinforced concrete railway tunnel lining structure within Hard Rock Mass using wet sprayed technique
Materials Science Forum, 2009Co-Authors: Tai Quan Zhou, Yuan HuaAbstract:The wet sprayed concrete technique has good virtue of improving the working condition within the tunnel, fewer reflective concrete loss and higher sprayed concrete quality. The concrete mixed with polypropylene fiber could improve the concrete inner structure, the flexural strength, tensile strength and anti-penetrating ability. The application of the wet sprayed polypropylene fiber reinforced concrete in the construction of tunnel lining structure could improve the stability of tunnel Rock Mass. The nonlinear finite element analysis is performed on Rock Mass stability of the railway tunnel lining structure and the Rock Mass stability is analyzed both for the un-lining tunnel and the lining tunnel. The computation result shows that the Rock Mass plasticity zone distribution with the lining structure is fewer than that without lining structure. To measure the deformation behavior, tunnel deformation measurement sensors are installed in the railway tunnel transverse section. The measured railway tunnel deformation result also shows that the lining structure deforms little and the RockMass is in stable state.
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Finite Element Analysis of Dongjusi Railway Tunnel within Hard Rock Mass Based on the Unified Rock Mass Strength Criterion
Key Engineering Materials, 2007Co-Authors: Tai Quan ZhouAbstract:The twin shear strength criterion has been proposed to consider the intermediate principal stress effect on the Rock Mass strength. The unified Rock Mass strength criterion could consider the intermediate principal stress effect on the Rock Mass strength. The unified Rock Mass elasto-plastic material model is implemented in ABAQUS user interface. As a case for study, the stability analysis of Dongjusi railway tunnel within Hard Rock Mass is studied using the unified Rock Mass strength material. For comparison, the Hoek-Brown empirical strength criterion is also chosen for the Rock Mass material modeling. The computation results show that the plastic zone calculated using the unified Rock Mass strength criterion is smaller than that using the Hoek-Brown empirical strength criterion. The railway tunnel lining structure is designed according to the unified Rock Mass strength criterion and greatly makes use of the Rock Mass potential strength, which decreases engineering cost.
Catrin Edelbro - One of the best experts on this subject based on the ideXlab platform.
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Different Approaches for Simulating Brittle Failure in Two Hard Rock Mass Cases: A Parametric Study
Rock Mechanics and Rock Engineering, 2010Co-Authors: Catrin EdelbroAbstract:One of the aims of Rock mechanics analysis is to predict fallouts in underground excavations. The objective of this paper was to study the relative importance of different strength parameters and their significance on the simulation of brittle failure and fallouts. This work was conducted as a parametric study, using numerical modelling and a number of approaches. The results were compared with observed fallouts. More obvious and distinct shear bands could be observed with decreased element sizes close to, and at, the boundary. The maximum shear strain was the most reliable indicator for fallout prediction. The results of the (instantaneous) cohesion softening friction softening models were sensitive to changes of the peak strength parameters and less sensitive to variations in residual parameters. The result from the cohesion-softening friction-Hardening (CSFH) model, when using a peak cohesion equal to the intact Rock strength, best captured the observed Rock behaviour.
Yuan Hua - One of the best experts on this subject based on the ideXlab platform.
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application study of polypropylene fiber reinforced concrete railway tunnel lining structure within Hard Rock Mass using wet sprayed technique
Materials Science Forum, 2009Co-Authors: Tai Quan Zhou, Yuan HuaAbstract:The wet sprayed concrete technique has good virtue of improving the working condition within the tunnel, fewer reflective concrete loss and higher sprayed concrete quality. The concrete mixed with polypropylene fiber could improve the concrete inner structure, the flexural strength, tensile strength and anti-penetrating ability. The application of the wet sprayed polypropylene fiber reinforced concrete in the construction of tunnel lining structure could improve the stability of tunnel Rock Mass. The nonlinear finite element analysis is performed on Rock Mass stability of the railway tunnel lining structure and the Rock Mass stability is analyzed both for the un-lining tunnel and the lining tunnel. The computation result shows that the Rock Mass plasticity zone distribution with the lining structure is fewer than that without lining structure. To measure the deformation behavior, tunnel deformation measurement sensors are installed in the railway tunnel transverse section. The measured railway tunnel deformation result also shows that the lining structure deforms little and the RockMass is in stable state.
Zhou Taiquan - One of the best experts on this subject based on the ideXlab platform.
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nonlinear finite element analysis of tunnel excavation and anchor sprayed concrete lining construction process within Hard Rock Mass
Journal of Hefei University of Technology, 2005Co-Authors: Zhou TaiquanAbstract:The polypropylene fiber reinforced concrete,which is a new type of the tunnel lining structure,has the characteristic of easy construction and can improve the concrete behavior and durability. To assure the safety in the construction process of the polypropylene fiber reinforced concrete lining structure, the nonlinear finite element method is used to analyze the large section tunnel excavation and the anchor sprayed lining process within the Hard Rock Mass of the Dongjusi railway tunnel. The numerical analysis is carried out to investigate the force and the displacement distribution of the anchor sprayed concrete layer and the plastic distribution region around the tunnel during the large section tunnel excavation and anchor sprayed lining construction process. The Rock Mass stability and the lining effect after the construction of the lining structure is studied.
Zhou Tai - One of the best experts on this subject based on the ideXlab platform.
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numerical inverse analysis for initial field stress determination for railway tunnel within Hard Rock Mass
Journal of Southern Yangtze University, 2006Co-Authors: Zhou TaiAbstract:The finite element method is used to inversely determine the Dongjusi railway tunnel Rock Mass initial stress field combined with the tunnel crown displacement and horizontal displacementīconvergence measured results.The railway tunnel Rock Mass stability is analyzed using the inverse analysis results.The numerical inverse analysis result shows that the calculated arch crown displacement and the horizontal displacement convergence results conincides with those of the measured results.The lining structure and the Rock Mass is in stable state.
