被保护煤层卸载煤体渗透率影响试验研究  

作　　者：仇海生 杨春丽 

机构地区：[1]煤科集团沈阳研究院有限公司,辽宁沈阳110016 [2]煤矿安全技术国家重点实验室,辽宁抚顺113112

出　　处：《科学技术创新》2021年第6期141-143,共3页Scientific and Technological Innovation

基　　金：辽宁省“百千万人才工程”资助项目(辽百千万立项【2017】21号)资助;辽宁省自然科学基金(20180540010)资助。

摘　　要：保护煤层的开采为被保护层提供了应力卸除空间,被保护煤层的煤体内部出现煤体变形、内部损伤、结构破坏,增加了被保护煤层煤体的渗透率,为研究被保护层煤体卸荷时渗透率的变化规律,采用自研的三轴瓦斯渗流试验系统,测试了围压加载至屈服点的、围压卸除后的型煤试块的渗透率。型煤试块加载破坏和卸载破坏存在明显差异,卸载前的加载过程,渗透率随加载应力变化特征与众学者的研究结果统一,型煤试块的渗透率随着应力加载逐渐降低。随着载荷的逐步卸除,类同于给型煤试块施加了轴向力使型煤试块的裂隙空间开始扩大,型煤试块的渗透率也逐渐升高。伴随着保护层的采掘推进,被保护煤层的卸压区范围逐渐增大,原本处于应力集中区的被保护煤体随着保护层的采掘推进逐渐转变成卸压区。The mining of the protected coal seam provides the stress relief space for the protected seam.The deformation,internal damage and structural damage of the coal body in the protected coal seam increase the permeability of the coal body in the protected seam.In order to study the change law of the permeability of the coal body in the protected seam when unloading,the self-developed three bearing vas seepage test system is used to test the confining pressure and the confining pressure from the confining pressure loading to the yield point Permeability of removed briquette test block.There are obvious differences between loading failure and unloading failure of briquette test block.The loading process before unloading and the variation characteristics of permeability with loading stress are consistent with the research results of many scholars.The permeability of briquette test block gradually decreases with the stress loading.With the gradual removal of the load,the axial force is applied to the briquette test block,so that the fracture space of the briquette test block begins to expand,and the permeability of the briquette test block also gradually increases.With the advance of the mining of the protective layer,the pressure relief area of the protected coal seam gradually increases,and the protected coal body,which was originally in the stress concentration area,gradually changes into the pressure relief area with the advance of the mining of the protective layer.

关 键 词：保护层 卸载煤体 渗透率 三轴渗流系统 

分 类 号：TD76[矿业工程—矿井通风与安全]