›› 2010, Vol. 31 ›› Issue (1): 265-270.

• Numerical Analysis • Previous Articles     Next Articles

Model with random cleats distribution for coal seams and its application

ZHANG Chun-hui1，YU Yong-jiang2，YUE Hong-liang1，ZHAO Quan-sheng1   

  1. 1. School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China; 2. School of Mechanics and Science Engineering, Liaoning Technical University, Fuxin 123000, China
  • Received:2009-02-27 Online:2010-01-10 Published:2010-02-02

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Abstract:

How to simulate random distribution of cleats in coal rock is key technique for simulation of methane recovery. Monte Carlo simulation technique is adopted to simulate the randomness of cleats distribution; and the model with random cleats distribution for coal seams is presented. RFSS2D (Random Fracture Simulation System in two dimensions) is developed with Matlab. Based on spot data for coal and their statistical analysis, not only the virtual fractured coal seams in which there is the same fractured statistical law with real engineering rock can be generated, but also FEM grid can be performed automatically by RFSS 2D. As a numerical case, a gas production well in Liaoning is studied with the model. According to spot and statistical data the model of random fractured coal is set up; and gas pressure and stress evolution are simulated. The results are as follows: Cleats which are connected with gas well greatly effect on gas flow; and cleats which are not connected with gas well finitely effect on gas flow.

Key words: random distributed cleats, Monte-Carlo simulation, model, gas flow

CLC Number: 

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