Numerical simulation of frozen wall formation in water-saturated rock mass by solving the Darcy-Stefan problem

AbstractThe fissures are ubiquitous in deep rock masses, and they are prone to instability and failure under dynamic loads. In order to study the propagation attenuation of dynamic stress waves in rock mass with different number of fractures under confining pressure, nonlinear theoretical analysis, indoor model test and numerical simulation are used respectively. The theoretical derivation is based on displacement discontinuity method and nonlinear fissure mechanics model named BB model. Using ABAQUS software to establish a numerical model to verify theoretical accuracy, and indoor model tests were carried out too. The research shows that the stress attenuation coefficient decreases with the increase of the number of fissures. The numerical simulation results and experimental results are basically consistent with the theoretical values, which verifies the rationality of the propagation equation.

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Application of ABAQUS in Surrounding Rock Stability Analysis of Shallow Large Cross-Section Tunnel

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.777.8 ◽

2015 ◽

Vol 777 ◽

pp. 8-12 ◽

Cited By ~ 1

Author(s):

Lin Zhen Cai ◽

Cheng Liang Zhang

Keyword(s):

Numerical Simulation ◽

Rock Mass ◽

Strong Support ◽

Surrounding Rock ◽

Tunnel Engineering ◽

Tunnel Excavation ◽

Rock Stability ◽

Rock Bolting ◽

Excavation Support ◽

The Stability

HuJiaDi tunnel construction of Dai Gong highway is troublesome, the surrounding-rock mass give priority to full to strong weathering basalt, surrounding rock integrity is poor, weak self-stability of surrounding rock, and tunnel is prone to collapse. In order to reduce disturbance, taking advantage of the ability of rock mass, excavation adopt the method of "more steps, short footage and strong support". The excavation method using three steps excavation, The excavation footage is about 1.2 ~ 1.5 m; The surrounding rock bolting system still produce a large deformation after completion of the first support construction, it shows that the adopted support intensity cannot guarantee the stability of the tunnel engineering. Using ABAQUS to simulate tunnel excavation support, optimizing the support parameters of the tunnel, conducting comparative analysis with Monitoring and Measuring and numerical simulation results, it shows that the displacement - time curves have a certain consistency in numerical simulation of ABAQUS and Monitoring and Measuring.

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Thermo-hydro-mechanical processes in fractured rock formations during a glacial advance

Geoscientific Model Development ◽

10.5194/gmd-8-2167-2015 ◽

2015 ◽

Vol 8 (7) ◽

pp. 2167-2185 ◽

Cited By ~ 15

Author(s):

A. P. S. Selvadurai ◽

A. P. Suvorov ◽

P. A. Selvadurai

Keyword(s):

Rock Mass ◽

Fractured Rock ◽

Fluid Pressure ◽

Computational Modelling ◽

Fracture Zones ◽

Saturated Rock ◽

Rock Formations ◽

Geological Formation ◽

High Level Nuclear Waste ◽

High Level

Abstract. The paper examines the coupled thermo-hydro-mechanical (THM) processes that develop in a fractured rock region within a fluid-saturated rock mass due to loads imposed by an advancing glacier. This scenario needs to be examined in order to assess the suitability of potential sites for the location of deep geologic repositories for the storage of high-level nuclear waste. The THM processes are examined using a computational multiphysics approach that takes into account thermo-poroelasticity of the intact geological formation and the presence of a system of sessile but hydraulically interacting fractures (fracture zones). The modelling considers coupled thermo-hydro-mechanical effects in both the intact rock and the fracture zones due to contact normal stresses and fluid pressure at the base of the advancing glacier. Computational modelling provides an assessment of the role of fractures in modifying the pore pressure generation within the entire rock mass.

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