Journal ArticleDOI
Numerical simulation of coal pillar strength
Ashok Jaiswal,B. K. Shrivastva +1 more
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TLDR
In this article, an approach for estimation of strain-softening constitutive behavior of coal-mass through calibration of a numerical model with field cases was described. But, this approach is limited to the case of coal pillars.About:
This article is published in International Journal of Rock Mechanics and Mining Sciences.The article was published on 2009-06-01. It has received 146 citations till now. The article focuses on the topics: Compressive strength & Coal.read more
Citations
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Comparative performance of six supervised learning methods for the development of models of hard rock pillar stability prediction
TL;DR: Six supervised learning algorithms, including linear discriminant analysis, multinomial logistic regression, multilayer perceptron neural networks, support vector machine (SVM), random forest (RF), and gradient boosting machine are evaluated for their ability to learn for PS based on different input parameter combinations.
Journal ArticleDOI
A numerical model for outburst including the effect of adsorbed gas on coal deformation and mechanical properties
TL;DR: In this paper, a model for gas migration and mechanical processes during excavation is established for gas desorption on outburst initiation, and the results obtained consider the deformation and mechanical changes and are compared with those obtained with consideration of only free gas.
Journal ArticleDOI
Study of a no-pillar mining technique with automatically formed gob-side entry retaining for longwall mining in coal mines
Qi Wang,Qi Wang,Manchao He,Jun Yang,Hongke Gao,Hongke Gao,Bei Jiang,Bei Jiang,Bei Jiang,Yu Hengchang,Yu Hengchang +10 more
TL;DR: In this article, a no-pillar mining technique with automatically formed gob-side entry retaining is proposed for long-wall mining, where pressure is offloaded via directional roof cutting, and a roadway is automatically formed via the ground pressure and rock breaking expansion.
Journal ArticleDOI
Field and numerical investigations of gateroad system failure induced by hard roofs in a longwall top coal caving face
TL;DR: In this article, the authors investigated the chain pillar and adjoining gateroad failure during a longwall top coal caving (LTCC) face retreat at the Majialiang coalmine located in Shanxi, China.
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A Novel Experimental Technique to Simulate Pillar Burst in Laboratory
TL;DR: In this article, a series of tests were conducted on some granite specimens using a true-triaxial strainburst test system and acoustic emission (AE) sensors were used to monitor the rock fracturing process.
References
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Journal ArticleDOI
Empirical Strength Criterion for Rock Masses
Evert Hoek,Edwin T. Brown +1 more
TL;DR: In this paper, an empirical strength criterion for rocks and rock masses is proposed, which includes the uniaxial compressive strength of the intact rock material and introduces two dimensionless parameters, m and s.
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Considerations of the dilatancy angle in rocks and rock masses
TL;DR: In this paper, the authors provide a detailed analysis of published test data with a view to proposing a sufficiently significant but conveniently simple formulation of the dilatancy angle that reflects these dependencies and that can be readily implemented in numerical codes.
Book
Empirical rock failure criteria
TL;DR: In this paper, a closed-form inter-relations between triaxial strength parameters, methods to derive an equation to Mohr's envelope, the influence of rock anisotropy, an anisotropic rock failure criterion, and three excavation case studies with complete details are presented.
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A study of the mechanical behaviour of coal for pillar design
T.P. Medhurst,Edwin T. Brown +1 more
TL;DR: A series of triaxial compression tests was carried out on 61, 101, 146 and 300mm diameter coal samples to investigate the effects of scale on the mechanical behavior of coal.
Journal ArticleDOI
Numerical estimation of pillar strength in coal mines
TL;DR: In this paper, the results of numerical modelling of failed and stable cases of pillars from Indian coal mines are reported and the complete procedure for modelling using FLAC3D in the strain-softening mode is given.