FLAC<sup>3D</sup> numerical analysis on surrounding rock mass stability of the underground cavities

To study the tunnel stability at various static water pressures and determine the mechanical properties and deformation behavior of surrounding rock, a modified effective stress formula was introduced into a numerical integration algorithm of elastic-plastic constitutive equation, that is, closest point projection method (CPPM). Taking the effects of water pressure and seepage into account, a CPPM-based formula was derived and a CPPM algorithm based on Drucker-Prager yield criterion considering the effect of pore water pressure was provided. On this basis, a CPPM-based elastic-plastic numerical analysis program considering pore water pressure was developed, which can be applied in the engineering of tunnels and other underground structures. The algorithm can accurately take the effects of groundwater on stability of surrounding rock mass into account and it can show the more pronounced effect of pore water pressure on stress, deformation, and the plastic zone in a tunnel. The stability of water flooding in Fusong tunnel was systematically analyzed using the developed program. The analysis results showed that the existence of groundwater seepage under tunnel construction will give rise to stress redistribution in the surrounding rock mass. Pore water pressure has a significant effect on the surrounding rock mass.

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Distance effects of the fault on the surrounding rock mass stability of the main powerhouse at the Huanggou pumped-storage power station

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2020.103568 ◽

2020 ◽

Vol 106 ◽

pp. 103568

Author(s):

K. Ma ◽

B. Feng ◽

D.Y. Zhuang ◽

X.F. Guo ◽

Q. Gao

Keyword(s):

Rock Mass ◽

Surrounding Rock ◽

Power Station ◽

Rock Mass Stability ◽

Distance Effects ◽

Pumped Storage

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3-D FLAC Numerical Analysis of Rheological Character and Stability of Underground Caverns Surrounding Rock Mass of Xiao Langdi Key Water Control Project

Fracture and Strength of Solids VI - Key Engineering Materials ◽

10.4028/0-87849-989-x.1473 ◽

2006 ◽

pp. 1473-1478

Author(s):

Wei Shen Zhu ◽

Jian Hua Liu ◽

Shu Cai Li

Keyword(s):

Rock Mass ◽

Numerical Analysis ◽

Surrounding Rock ◽

Water Control ◽

Underground Caverns ◽

Rheological Character

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Numerical Analysis of Damage for Y-Shape Tunnel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.368-373.2517 ◽

2011 ◽

Vol 368-373 ◽

pp. 2517-2520

Author(s):

Da Ming Lin ◽

Yan Jun Shang ◽

Guo He Li ◽

Yuan Chun Sun

Keyword(s):

Numerical Simulation ◽

Rock Mass ◽

Numerical Analysis ◽

Plastic Zone ◽

Comprehensive Analysis ◽

Surrounding Rock ◽

Tunnel Construction ◽

Deformation And Failure ◽

Single Beam ◽

Flac 3D

There are many effective researches about tunnel at home and abroad, because the complexity of design and construction for Y-shape tunnel, in public there is no research about it yet, with the background of nanliang-tunnel which merge two single-beam into a two-lane tunnel as Y-shape. This paper obtains the rock mass mechanics parameters on the basis of nonlinear Hoek-Brown criterion first, and has a numerical simulation according the tunnel construction with FLAC-3D. we arrange many monitor sections in this model and discuss the law of deformation and failure in different section, at last have a comprehensive analysis of displacement, stress, plastic zone of different sites which caused by tunnel construction and discover that: with the distance of two single tunnels decreased, the interaction caused by the merging increase together with the compressive stress, tensile stress. The displacements of surrounding rock increase corresponding, the amplitude of variation is up to 44.8%, After the two-lane tunnel is 15m long, the stress and displacements redistribution of surrounding rock become stable.

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