Dual-porosity structure and bimodal hydraulic property functions for unsaturated coarse granular soils

2009 ◽  
Author(s):  
Xu Li
Keyword(s):  
Dual Porosity ◽  
Granular Soils ◽  
Hydraulic Property ◽  
Porosity Structure

scholarly journals Model development and analysis of coal permeability based on the equivalent characteristics of dual-porosity structure

2019 ◽  
Vol 17 (2) ◽  
pp. 313-327
Author(s):  
Haijun Guo ◽  
Kai Wang ◽  
Yuanping Cheng ◽  
Liang Yuan ◽  
Chao Xu
Keyword(s):  
Coalbed Methane ◽  
Model Development ◽  
Gas Pressure ◽  
Dual Porosity ◽  
Permeability Evolution ◽  
Evolution Law ◽  
Fracture Width ◽  
Coal Permeability ◽  
Porosity Structure ◽  
Gas Seepage

Abstract Mining is a dynamic fracture process of coal and/or rock. The structural failure of coal bodies will change the coal matrix-fracture characteristics and then affect the distribution characteristics of the coalbed methane (CBM). Because of the structural complexity of coal, the coal matrices and fractures will be assumed to the geometries with rule shapes when the gas seepage characteristics in coals are analyzed. The size of the simplified geometries is the equivalent scale of dual-porosity coal structures (i.e. the equivalent fracture width and equivalent matrix scale). In this paper, according to the reasonable assumptions with regarding to dual-porosity coal structures, a new coal permeability evolution model based on the equivalent characteristics of dual-porosity structure (ECDP model) was built and the effect of the equivalent characteristics of dual-porosity structure on the coal permeability evolution law was analyzed. It is observed that if the initial fracture porosity is constant and the equivalent matrix scale increases, the range in which the permeability of coal rises with rising gas pressure increases; if the equivalent fracture width decreases and the equivalent matrix scale is constant, the range in which the permeability of coal rises with rising gas pressure decreases. The ECDP model is more suitable for revealing the evolution law of the coal permeability when large deformations occur in the coal bodies and/or the coal structure is damaged irreversibly, especially during enhancing CBM recovery.

Experimental and computational validation and verification of the Stokes-Darcy and continuum pipe flow models for karst aquifers with dual porosity structure

2011 ◽  
Vol 26 (13) ◽  
pp. 2031-2040 ◽  
Author(s):  
Xiaolong Hu ◽  
Xiaoming Wang ◽  
Max Gunzburger ◽  
Fei Hua ◽  
Yanzhao Cao
Keyword(s):  
Pipe Flow ◽  
Dual Porosity ◽  
Karst Aquifers ◽  
Validation And Verification ◽  
Flow Models ◽  
Porosity Structure ◽  
Computational Validation

Electrospun dual-porosity structure and biodegradation morphology of Montmorillonite reinforced PLLA nanocomposite scaffolds

Biomaterials ◽  
2005 ◽  
Vol 26 (16) ◽  
pp. 3165-3172 ◽  
Author(s):  
Yun Hui Lee ◽  
Jong Hoon Lee ◽  
In-Gu An ◽  
Chan Kim ◽  
Doo Sung Lee ◽  
...  
Keyword(s):  
Dual Porosity ◽  
Porosity Structure ◽  
Nanocomposite Scaffolds

Characterization of dual-structure pore-size distribution of soil

2009 ◽  
Vol 46 (2) ◽  
pp. 129-141 ◽  
Author(s):  
X. Li ◽  
L. M. Zhang
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Void Ratio ◽  
Experimental Results ◽  
Dual Porosity ◽  
Porosity Structure ◽  
The Relationship ◽  
Comprehensive Study

The microporosity structure of soil provides important information in understanding the shear strength, compressibility, water-retention ability, and hydraulic conductivity of soils. It is a soil characteristic that depends on sample preparation method and wetting–drying history. A comprehensive study of the microporosity structure of a lean clay with sand was conducted in this research to investigate variations of the microporosity structure during compaction, saturation, and drying processes. Scanning electron microscopy was used to observe the microporosity structure of soil sample surfaces. Mercury intrusion porosimetry was used to measure the microporosity structure quantitatively by showing the relationship between cumulative pore volumes and pore radius. The experimental results show that a dual-porosity structure (i.e., interaggregate pores and intra-aggregate pores) forms during the compaction process. The interaggregate pores are compressible and the associated volume is closely related to the final void ratio of the compacted sample. Changes to interaggregate pores is dominant during compaction, but changes to intra-aggregate pores is dominant during saturation and drying. Based on the experimental results, a dual-porosity structure model was developed by relating the pore-size distribution to the void ratio. Consequently, the pore-size distribution at any void ratio can be predicted.

Coal permeability prediction method based on the microscopic pore-fracture dual-porosity structure

2022 ◽  
pp. 110107
Author(s):  
Hongyang Ni ◽  
Jiangfeng Liu ◽  
Tao Chen ◽  
Shaojie Chen ◽  
Qingbin Meng
Keyword(s):  
Prediction Method ◽  
Dual Porosity ◽  
Coal Permeability ◽  
Porosity Structure ◽  
Permeability Prediction

Effect of Fabric on Low-Strain Stiffness Properties of Granular Soils

2014 ◽  
Author(s):  
Chrysovalantis Tsigginos ◽  
Mourad Zeghal
Keyword(s):  
Granular Soils ◽  
Stiffness Properties

scholarly journals Gas seepage laws based on dual porosity and dual permeability: Numerical simulation and coalbed methane extraction practice

2021 ◽  
Author(s):  
Chao Xu ◽  
Liangliang Qin ◽  
Kai Wang ◽  
Haoshi Sun ◽  
Mingyue Cao
Keyword(s):  
Numerical Simulation ◽  
Coalbed Methane ◽  
Dual Porosity ◽  
Methane Extraction ◽  
Gas Seepage

scholarly journals Laser-Induced Breakdown Spectroscopy (LIBS) characterization of granular soils: Implications for ChemCam analyses at Gale crater, Mars

Icarus ◽  
2021 ◽  
Vol 365 ◽  
pp. 114481
Author(s):  
G. David ◽  
P.-Y. Meslin ◽  
E. Dehouck ◽  
O. Gasnault ◽  
A. Cousin ◽  
...  
Keyword(s):  
Laser Induced Breakdown Spectroscopy ◽  
Granular Soils ◽  
Gale Crater ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Fractal permeability model for dual-porosity media embedded with natural tortuous fractures

Fuel ◽  
2021 ◽  
Vol 295 ◽  
pp. 120610
Author(s):  
Yafei Luo ◽  
Binwei Xia ◽  
Honglian Li ◽  
Huarui Hu ◽  
Mingyang Wu ◽  
...  
Keyword(s):  
Dual Porosity ◽  
Permeability Model
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