Subsurface strata failure and movement based for improving gas emission control: Model development and application,Energy Science & Engineering

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Subsurface strata failure and movement based for improving gas emission control: Model development and application
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/ese3.723
Jianwei Cheng _{1,

2,

3} , Zui Wang ₂ , Siyuan Li ₂ , Wanting Song ₂ , Weidong Lu ₃ , Yongjun Zhang ₄ , Kang Zhao ₅

Affiliation

In underground mining operations, the overlying strata move, deform, and crack as the underground working face advances due to strata breakage, failure, and subsidence, forming a “vertical three zone” over the mined out area. The permeability of strata under mining changes differently in different zones. Therefore, studying the distribution of strata permeability is very important to obtain knowledge of gas migration pattern in the overlying strata in order to increase the gas extraction efficiency. In this study, a series of numerical models are developed to describe the overlying strata movement for three different zones. In detail, models for calculating the strata subsidence for fracture and bending zones and analyzing strata collapsing development for the caving zone are proposed based on the influence function method and mechanical analyses. In addition, on the basis of such models, a new comprehensive model to describe the strain‐porosity‐permeability of strata is developed. In the case study of applying such models in an underground mine, the reliability of the strata movement model is verified and the permeability change is also calculated, which gives a good guidance to design the location of gas drainage roadway practices in the future. The field engineering practice shows its good application.

中文翻译：

基于地下气体层破坏和运动以改善气体排放控制的模型开发和应用

在地下采矿作业中，由于地层破裂，破坏和沉陷，随着地下工作面的推进，上覆地层会移动，变形和破裂，从而在采空区上形成“垂直的三个区域”。采矿条件下地层的渗透率在不同区域有不同的变化。因此，研究地层渗透率的分布对于了解上覆地层中的天然气运移规律，以提高瓦斯抽采效率非常重要。在这项研究中，开发了一系列数值模型来描述三个不同区域的上覆地层运动。在此基础上，基于影响函数法和力学分析，提出了裂缝折弯带地层沉降计算模型和崩落带地层塌陷发育分析模型。此外，在这种模型的基础上，开发了描述地层应变-孔隙度-渗透率的新的综合模型。在将这种模型应用于地下矿井的案例研究中，验证了地层运动模型的可靠性，并计算了渗透率变化，为将来设计瓦斯抽放巷道的位置提供了很好的指导。现场工程实践证明了它的良好应用。这为将来设计瓦斯抽放巷道的位置提供了很好的指导。现场工程实践证明了它的良好应用。这为将来设计瓦斯抽放巷道的位置提供了很好的指导。现场工程实践证明了它的良好应用。

更新日期：2020-05-25

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