煤层等温吸附渗透率演化数值研究

发布时间：2018-04-28 10:04

本文选题：渗透率 + 煤基质　；参考：《煤矿安全》2016年03期

【摘要】：通过建立双孔隙度煤层变形控制方程,确定了基于煤层吸附理论的Biot孔隙压力系数。分别建立了存在吸附作用的条件下,煤层基质和裂隙渗透率的数值模型。研究发现,通过增加基质孔隙压力,基质将发生与孔隙压力相关的体积应变,基质体积模量将会减小;基质增大的体积占据了部分孔隙,导致煤层基质渗透率减小;随着吸附的进行,经过一定时间,煤层裂隙渗透率会出现陡降。
[Abstract]:The Biot pore pressure coefficient based on coal adsorption theory is determined by establishing the deformation control equation of double porosity coal seam. The numerical models of coal seam matrix and fracture permeability were established under the condition of adsorption. It is found that by increasing the pore pressure of the matrix, the volume strain associated with the pore pressure of the matrix will occur, and the volume modulus of the matrix will decrease, while the increased volume of the matrix will occupy part of the pores, resulting in the decrease of the permeability of the coal bed matrix. With the adsorption, the permeability of coal seam fissure will drop steeply after a certain time.
【作者单位】：贵州理工学院采矿工程学院;
【基金】：贵州省科技厅科技合作计划资助项目(黔科合LH字[2015]7107) 贵州省教育厅招标资助项目(黔教合KY字[2015]353)
【分类号】：TD712

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