水分对煤全应力-应变过程渗流特征的影响  

Influence of moisture on seepage characteristics of coal during total stress-strain process

作　　者：庄小威 唐朝 武海涛 ZHUANG Xiaowei;TANG Chao;WU Haitao(Shanxi Lu’an Group Yuwu Coal Industry Co.,Ltd.,Changzhi 046100,China;College of Safety Science and Engineering,Liaoning Technical University,Huludao 125105,China)

机构地区：[1]山西潞安集团余吾煤业有限责任公司,山西长治046100 [2]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105

出　　处：《煤矿安全》2023年第12期25-31,共7页Safety in Coal Mines

摘　　要：为探究水分对煤力学性质和渗流特征的影响,开展了干燥煤样和饱水煤样全应力-应变过程渗流实验,分析了2种含水状态煤样全应力-应变特征及渗透率演化规律。实验结果表明:干燥煤样全应力-应变曲线具有5个阶段,而饱水煤样仅具有4个阶段;饱水煤样在经历峰值应力破坏后,轴向应力跌落了36.82%,全应力-应变曲线中应变软化阶段消失;饱水煤样与干燥煤样相比,抗压强度下降了8.95%,弹性模量降低了8.54%,峰值应力降低了8.90%,应力跌落幅度增大了10.87%;干燥煤样渗透率随轴向应变增大而增大,整体呈线性关系;饱水煤样渗透率和应变的关系具有明显的阶段性,可分为稳定渗流阶段和快速渗流阶段;水分的存在会抑制煤体瓦斯渗流过程,在瓦斯抽采工程中应当注意煤层排水。In order to study the influence of moisture on seepage characteristics of coal during the complete stress-strain process,the complete stress-strain process with seepage experiment of dry coal sample and full-water coal sample were carried out,and the complete stress-strain characteristics and permeability evolution laws of two coal samples were analyzed.The experimental results showed that the complete stress-strain curve of dry coal sample had five stages,while the full-water coal sample had only four stages.After the peak stress destruction,the axial stress of full-water coal sample fell by 36.82%,and the strain softening phase disappeared in the full stress-strain curve.Compared with dry coal samples,the compressive strength,elastic modulus and peak stress of saturated coal samples decreased by 8.95%,8.54%,8.90%and 10.87%respectively.The permeability of dry coal sample increases with the increase of axial strain,and the relationship is linear.The relationship between permeability and strain of saturated coal sample has obvious stages,which can be divided into stable seepage stage and rapid seepage stage.The existence of water will inhibit the gas seepage process of coal body,so the drainage of coal seam should be paid attention to in the gas extraction project.

关 键 词：水分 全应力-应变 渗流特征 瓦斯抽采 煤层透气性 

分 类 号：TD712[矿业工程—矿井通风与安全]