Study on coal permeability model in front of working face under the influence 
of mining disturbance and temperature coupling

RONG Teng-long; ZHOU Hong-wei; WANG Lu-jun; REN Wei-guang; WANG Zi-hui; SU Teng

doi:10.16285/j.rsm.2018.1664

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Study on coal permeability model in front of working face under the influence of mining disturbance and temperature coupling

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- Study on coal permeability model in front of working face under the influence of mining disturbance and temperature coupling
- Vol. 40, Issue 11, Pages: 4289-4298(2019)
- 作者机构：
  
  1. 中国矿业大学（北京）力学与建筑工程学院,北京,100083
  2. 中国矿业大学（北京）能源与矿业学院,北京,100083
  3. 中国矿业大学（北京）煤炭资源与安全开采国家重点实验室,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.1664
  CLC： TD712
- Online First：13 November 2019，
  
  Published：2019
- 稿件说明：
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RONG Teng-long, ZHOU Hong-wei, WANG Lu-jun, et al. Study on coal permeability model in front of working face under the influence of mining disturbance and temperature coupling[J]. 2019, 40(11): 4289-4298.
DOI：

RONG Teng-long, ZHOU Hong-wei, WANG Lu-jun, et al. Study on coal permeability model in front of working face under the influence of mining disturbance and temperature coupling[J]. 2019, 40(11): 4289-4298. DOI： 10.16285/j.rsm.2018.1664.

摘要

为了探究采掘扰动和温度变化对工作面前方煤体渗透率的影响，将引起煤体裂隙变形的因素划分为有效应力、吸附解吸和热膨胀3部分。基于损伤力学、吸附理论和热应力理论推导出了采掘扰动与温度耦合作用下煤体裂隙应变表达式，进而构建了采掘扰动与温度耦合影响下工作面前方煤体渗透率模型。结合改变温度、同时改变扰动应力和温度的两种渗透率试验结果对所建立的模型适用性进行了拟合分析，并对模型中的参数敏感性进行了讨论。结果表明：所构建的煤体渗透率模型可以较好地描述采掘扰动与温度耦合影响下煤体渗透率的演化过程；在同一温度下，煤体渗透率随着内膨胀应变系数的增大而增大，随着热内膨胀应变系数的增大而减小。研究结果可为煤炭开采及瓦斯抽采的工作提供指导。

Abstract

To study the influence of mining disturbance and temperature on coal permeability in front of the working face

the fracture deformation factors caused by mining stress and temperature were divided into three parts: effective stress

adsorption and thermal expansion. The fracture strain expression was derived from damage mechanics

adsorption theory and thermal stress theory. The expression included the coupling damage effect of disturbance stress and temperature. Furthermore

the permeability model of coal under the influence of mining disturbance and temperature was established. The permeability model was verified and analyzed according to two permeability tests. One was changing temperature and the other was changing the disturbance stress and temperature simultaneously. In addition

the parameter sensitivity was also analyzed. The results show that the model can well represent the evolution process of coal permeability with the mining disturbance and temperature effect. Under the same temperature

permeability increases with the increase of internal swelling ratio. Permeability decreases with the increase of thermal internal swelling ratio. The research results will provide useful reference for the development of coal mining and gas extraction technology.

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