论文部分内容阅读
对应力敏感性实验卸载后的寺河煤矿高阶煤进行105℃加热12h消除内应力之后,重复进行应力敏感性实验。结果发现:原始渗透率小于1mD的煤样,内应力消除后,渗透率得以恢复,应力敏感性曲线与初次测试基本重合;原始渗透率大于1mD的煤样,反复压实至渗透率接近1mD时,渗透率恢复度同样达到90%。表明该区煤样在很大应力范围内(8MPa)发生的应力形变为弹性形变,而非以往认为的弹塑性形变。
After stress-sensitivity experiments, the high-rank coal of Sihe coal mine after unloading was subjected to heat stress at 105 ℃ for 12 hours to eliminate the internal stress, and the stress sensitivity experiment was repeated. The results show that when the initial permeability is less than 1mD, the permeability is restored and the stress sensitivity curve basically coincides with that of the first test. When the initial permeability is more than 1mD, the coal samples are repeatedly compacted until the permeability is close to 1mD , Permeability recovery also reached 90%. It shows that the stress of the coal sample in the area under a great stress range (8MPa) is deformed to elastic deformation, rather than the elastoplastic deformation which is considered in the past.