There have not been any magma activities in the area since the Mz;the geological characteristics and. the results of the thermal simulated experiment of the coal me...

• 打前探孔、震动放炮、抽放卸压等措施对于防治突出,减少损失具有积极的作用,而厚煤层中的断裂带部位是最危险的区段,应重点防范。