摘要
为探究不同地应力及气体压力下瓦斯气体在煤层中的渗流规律,进而为瓦斯抽采及瓦斯事故防治技术提供技术支持,以科学试验为手段,对不同围压及气体压力条件下煤样渗透率的演化规律进行了深入研究。得出如下结论:煤样渗透率在全应力-应变过程中可被划分为3个阶段,即逐渐减小阶段、基本稳定阶段、显著增加阶段;当煤样所处气压与轴压恒定不变时,其渗透率随围压的逐渐增加表现为"负指数"式下降的演化规律;当煤样所处围压与轴压恒定不变时,其渗透率随气压的增加表现为"二次函数"式先下降后上升的演化规律;围压和气压共同作用下的煤样渗透率演化规律符合"z=z0+aσ3+bp+cσ23+d p2+eσ3p"的特点,且煤样渗透率对围压的敏感性相较气压敏感性要强。
In order to explore the permeability law of gas in coal seam under different ground stresses and gas pressures,and to provide technical support for gas extraction and gas accident prevention technology,the evolution law of coal permeability under different confining pressure and gas pressure was studied by means of scientific experiment.The following conclusions are drawn.In the total stress-strain process,the permeability of coal sample can be obviously divided into three stages:gradual decrease,basic stability and significant increase.The permeability decreases in a negative exponential manner with the increasing of confining pressure when the pressure and axial pressure of the coal sample are constant.The permeability decreases first and then rises like the form of"quadratic function"with the increase of air pressure when the confining pressure and axial pressure of the coal sample are constant.Under the combined action of confining pressure and gas pressure,the permeability evolution law of coal sample conforms to the characteristics of"z=z0+aσ3+bp+cσ23+dp2+eσ3 p",and the permeability of coal sample is more sensitive to confining pressure than to gas pressure.
作者
任松
王卓雄
张闯
REN Song;WANG Zhuoxiong;ZHANG Chuang(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing 400044,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第1期100-104,共5页
Mining Research and Development
基金
国家自然科学基金资助项目(51774057)。
关键词
煤体
渗透率
围压
气压
Coal body
Permeability
Confining pressure
Gas pressure
