Paper Title:
Modeling of Stress-Induced Permeability Evolution and Damage of Rock
  Abstract

Rock permeability is important in civil and geo-hydraulic engineering, the mining and petroleum industries, and in environmental and engineering geology. In this paper, considering the mutual hydro-mechanical response between stress-induced permeability and damage, a coupled mathematical model for solid deformation and gas flow in the coal or rock was established and an attempt is made to investigate the rock permeability evolution, fracture patterns, and flow vectors in rock samples at the scale of usual laboratory samples as well as the relation between permeability and stress induced damage in connection with the complete strain-stress process of loaded rocks. Numerical simulations show that the permeability of rock was not constant, closely related to the state of stress, but varied with the stress and strain states in the rocks. Microcracking, resulting from the concentration of stress on relatively weak rock elements, triggers successive crack initiation and propagation that in turn leads to permeability enhancement. Prior to the peak strength, the permeability decreases with increasing load. A dramatic increase in permeability occurs in the post-peak stress-strain region due to the catastrophic collapse of microstructure in rock. Moreover, the permeability of rock in post-peak stress-strain region is much higher that that of in pre-peak region. Such intensive studies of gas flow in stressed heterogeneous rocks are useful as initial approaches to many engineering problems in mining and petroleum industries.

  Info
Periodical
Advanced Materials Research (Volumes 33-37)
Edited by
Wei Yang, Mamtimin Geni, Tiejun Wang and Zhuo Zhuang
Pages
609-616
DOI
10.4028/www.scientific.net/AMR.33-37.609
Citation
T. Xu, C. A. Tang, "Modeling of Stress-Induced Permeability Evolution and Damage of Rock", Advanced Materials Research, Vols. 33-37, pp. 609-616, 2008
Online since
March 2008
Authors
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Su Ling Wang, Qing Bin Li, Zhen Xu Sun, Zheng Wei Tian
Abstract:Fracture initiation is a key factor of hydraulic fracturing, as lack of research on fracture initiation position.The perforation geostress...
2761
Authors: Peng Qi, Zhi Rong Mei
Chapter 6: Advanced Construction Materials
Abstract:Gas permeability mechanism for the laminated salt rock gas storage is very complex. The key problem is to establish the permeability model...
1146
Authors: Xu Shu Sun, Jian Lin Li, Shi Zhou, Jun Lei Bai
Chapter 14: Multi-Field Coupling Theory and its Applications
Abstract:According to the characteristics that permeability and elastic modulus vary with stress, the variation of elastic modulus of sandstone change...
2552
Authors: Deng Ke Wang, Jian Ping Wei, Heng Jie Qin, Le Wei
Chapter 1: Geological and Geotechnical Engineering
Abstract:Considering the variation of the porosity and permeability of coal containing gas at differential deformation stages, a dynamic model for...
446
Authors: Shi Bin Li, Zhi Chao Kang, Li Gang Zhang
Chapter 15: Mineral Prospecting and Geological Exploration
Abstract:Water fracturing is vast applied in low permeability oil-gas filed, and gains extremely economic benefit. But not all low permeability...
2816