【作者】 张永利； 曹竹； 肖晓春； 秦豹； 徐军； 孙雅楠；

【Author】 ZHANG Yongli;CAO Zhu;XIAO Xiaochun;QIN Bao;XU Jun;SUN Yanan;College of Mechanics and Engineering,Liaoning Technical University;

【机构】 辽宁工程技术大学力学与工程学院；

【摘要】 温度的作用会在煤体上产生热应力,进而引发煤体的裂隙发育乃至引发破裂,有利于瓦斯的抽采.利用RFPA有限元软件模拟加温热处理时煤体的破裂过程,观察不同温度下煤体破裂的裂纹裂隙发展规律.采用声发射的试验方法对不同围压下温度改变时煤体内部裂隙发展进行细微观察并与RFPA数值模拟结果进行对比.研究结果表明:温度改变产生的热应力能够使煤体温度升高,进而破坏原有割理系统产生新的裂隙裂纹;当温度达到一定值时,煤体内部孔隙裂隙发育扩展较为明显,形成主裂纹,有效渗透通道增加,降低煤体对气体分子的吸附能力,提高游离气体含量,渗透率明显提高.该研究可为预防瓦斯相关灾害和瓦斯的抽采提供理论参考.更多还原

【Abstract】 The temperature will induce thermal stresses in the coal body and lead to fractures and even an abruption,which might improve the gas extraction.Based on the finite element software RFPA,the process of fracturing during heating is simulated,and the evolution of coal fracturing at different temperatures is revealed.Using the acoustic emission technique,the internal fissures of the coal are identified under different temperatures and confining pressures.The results are compared and it is shown that the thermal stress generated by the temperature can raise the coal temperature,destroy the original cleat system,and produce new cracks.When the temperature reaches to a certain value,the porosity fracture of the internal coal expands,the main cracks are formed,the effective penetration channel is enlarged,the adsorption capacity of the coal is reduced,the content of the free gas is increased,and the penetration is significantly increased.The work might provide some insight in preventing the mine disaster due to the gas,and also for the gas extraction.更多还原