Numerical Assessment on Unloading Disturbance and Gas Extraction in Remote Distance Protective Layer Mining

钻孔 煤矿开采 磁导率 萃取(化学) 计算机模拟 压力(语言学) 石油工程 扰动(地质) 气体压力 采矿工程 环境科学 岩土工程 地质学 工程类 模拟 废物管理 化学 生物化学 哲学 古生物学 色谱法 语言学
作者
Zhigang Yuan,Zehua Jiang,Shuqing Li,Jintao Zhao,Fei Huang
出处
期刊:Geofluids [Hindawi Publishing Corporation]
卷期号:2022: 1-17 被引量:1
标识
DOI:10.1155/2022/3679384
摘要

Protective layer mining could not only significantly alter geostress but also increase the permeability of protected layer, which is beneficial for the coal gas extraction rate and ensures coal mining safety. However, due to unique geologic conditions, remote distance protective layer mining has its own characteristics. To investigate characteristic changes caused by remote distance protective layer mining, a suitable mathematical model that considered disturbance of unloading mining and solid-gas coupling effects during gas extraction was developed. The established mathematical model was implemented by combining FLAC3D and COMSOL programs to study characteristic changes during remote distance protective layer mining of Chajiaotan coal mine. Numerical simulation results of unloading disturbance mining indicated that the protected layer would experience a process of stress loading, stress unloading, stress recovery, and stress stability as the working face of protective layer advanced; unloading disturbance has a greater influence on coal permeability than gas pressure; gas extraction measure should be further adopted to decrease gas pressure. Numerical comparisons of gas pressure distribution in the original protected layer and unloading protected layer revealed that gas extraction after unloading disturbance can reduce gas pressure more effectively, and appropriate borehole spacings in the fully pressure-relief and nonfully pressure-relief zones are 30 m and 5 m, respectively. The layout of field boreholes for gas extraction was designed according to numerical results. The results of site investigation showed that numerical simulation results of relative expansion deformation and gas extraction radii agree well with the results of site observation, demonstrating reliability of the mathematical model and its implementation. The proposed mathematical model is promising for assessing unloading disturbance and gas extraction in remote distance protective layer mining.
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