(PDF) Laboratory Model Tests and DEM Simulations of
tunnel excavation and contributing to strong force chain effects. The radial and tangential . COMSOL implementation and case studies. Advances in . …
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(PDF) Stability Analysis of Irregular Cavities in Tunnel
COMSOL software reserves a points scanning model in- of tunnel excavation and the economic cost. Conversely, if. the safety distance is determined too small, high-risk cavities.
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Yield Surfaces and Plastic Flow Rules in - COMSOL
Oct 16, 2014 · This tunnel excavation simulation has been carried out in four different cases in order to compare the different soil models presented in the previous section as well as understand the influence of the cohesion on the soil's behavior.
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Two-dimensional MoS2: Properties, preparation, and
Mar 01, 2015 · 1. Introduction. Graphene, which is a typical two-dimensional (2D) layered material, has experienced its brilliant age since it was first mechanically exfoliated from three-dimensional (3D) graphite in 2004 .Many strikingly highlighted properties, such as its high transparency (97.7% transmittance in the visible spectrum), high thermal conductivity at room temperature (3 × 10 3 …
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حفاری تونل - Tunnel Excavation - کامسول یار comsol امیرکبیر
Tunnel Excavation این مدل تخمینی از رفتار خاک در طی حفاری تونل را ارائه میدهد. استقرار سطح و عرض ناحیۀ پلاستیک اطراف تونل پارامترهای مهمی است که به منظور پیشبینی آرماتورها برای استفاده در حین
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Study on Gas Migration,Emission,Diffusion Law and
Abstract： With the continuous improvement of China's economic and social development level,the construction scale of traffic facilities shows a trend of continuous and rapid development,and the construction scale of highway tunnels also shows an obvious growth.With the continuous expansion of highway tunnel construction scale,higher requirements are put …
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(PDF) Numerical simulation of tunnel excavation
Simultaneously, some methods are proposed to solve this hydro-mechanical coupling method for simulating the excavation process of tunnel, e.g. analytical …
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Stability Analysis of Irregular Cavities in Tunnel Using
Mar 22, 2021 · The erosion of soluble rock and transformation of groundwater result in the high irregularity of cavities in tunnel. At present, however, karst cavities are mainly simplified as circular, rectangular, or elliptical shape in the numerical simulation. The purpose of this paper is to propose a new method to analyze the stability of irregular cavities.
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An Innovation Simulation Method for Flow State Evolution
In order to avoid heavy casualties and economic losses, and to get an insight into flow state evolution laws of water inflow and inrush in course of tunnel excavation, simulations were done with COMSOL Multiphysics. By coupling and linking different kinds of sub domain governing equations with boundary conditions and possibly initial conditions, three kinds of water flow …
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Comprehensive Influence Analysis of Multiple Parameters on
Dec 12, 2020 · In view of the reserved safety thickness for the tunnel face with an anterosuperior karst cave filled with water in urban subway construction, the authors study the influence law and response sensitivity of different types and diameters of the shield machine cutter head and different diameters and water pressure of the anterosuperior karst cave
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Tunnel Excavation - comsol.fr
This model provides an estimation of the behavior of the soil during a tunnel excavation. The surface settlement and the width of the plastic region around the tunnel are important parameters needed to predict the reinforcements to use during the excavation.
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Numerical Analysis of Surrounding Rock Stability in Super
Up to12%cash back · Sep 01, 2018 · Finally, the PDE module of COMSOL software is called for solving the discretized model to simulate the stability of surrounding rock after tunnel excavation process. Secondly, the displacement deformations of surrounding rock calculated by hydro-mechanical model are compared with the values measured in site and highly agreement is …
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(PDF) Numerical Simulation of Mountain Deformation and
PDF | On Jan 1, 2020, published Numerical Simulation of Mountain Deformation and Stress Induced by Multi Tunnel Excavation | Find, read and cite …
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Stability analysis for compressed air energy storage
Firstly, an initial heterogeneous excavation damage zone (EDZ) in the surrounding rock mass is partitioned based on mining and operation processes. Then, a thermal-hydraulic-mechanical coupling model is formulated for the CAES cavern with a sealing layer and implemented within COMSOL Multiphysics.
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Oct 18, 2021 · For tunnel construction, surface deformation and plastic region are essential indictors for reinforcements during the excavation. Therefore, the soil behaviour during a tunnel excavation is simulated with the elastoplastic model by COMSOL Multiphysics [9] (Figure 1(a)) and unsupported exaction is considered for simplification. In the initial
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Yield Surfaces and Plastic Flow Rules in - COMSOL
Oct 16, 2014 · A tunnel 10 meters in diameter is placed 10 meters away from the symmetry axis and 20 meters below the surface. First of all, we need to add the in-situ stresses in the soil before the excavation of the tunnel. Then, we can compute the elastoplastic behavior once the soil corresponding to the tunnel is removed.
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Construction sequence - tunnel - comsol.it
1. excavation 2. lining installation I'm modelling construction of convention tunnelling process (excavation e.g. by roadheader) and sprayed concrete as a lining. After excavation, surrounding soil is deformed which is the first step of my calculations. After it, on a deformed tunnel walls concrete is sprayed to form lining.
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Numerical Analysis of Surrounding Rock Stability in Super
Sep 01, 2018 · In this study, based on the COMSOL commercial software as a secondary development platform, hydro-mechanical coupled simulation analysis for surrounding rock stability after tunnel excavation is realized through calling the PDE (partial differential equation) calculation module and self-defining the related functions and parameters according to
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Research on the Deformation of Tunnel with the Influence
This paper discusses a tunnel whose entrance region is the main engineering background. Based on tunnel geological exploration report, we make the model. By establishing model and using numerical simulation software SIGMA/W and COMSOL to simulate the distortion in seepage condition, we find as tunnel excavation goes on, the pore water pressure of tunnel changes …
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Numerical Simulation of Mountain Deformation and Stress
The results show that the tunnel excavation stress is mainly concentrated around the tunnel portal, and the soil deformation is mainly located at the top and left and right sides of the tunnel.
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