摘要
本文对甘肃窑街煤矿特大型二氧化碳突出的特征、地质构造背景及防治工作进行了研究。研究结果表明突出气体是煤系自燃热解所生成,根据对方解石脉进行裂变径迹测年和气体的氩同位素研究,表明气体形成于晚第三纪至早更新世;突出区大量CO_2气主要受断裂构造与强应力场控制而蕴藏在厚煤层中。 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。
The results of research and prevention of CO2 gas outburst in Yaojie Coalmine are introduced.
The range of δ13C is very broad, so it is inadvisable to determine the genesis and type of the CO2 gas only based on the δ13C value of the CO2 in a site. The 3He/ 4He value of the outburst gas is n×10-8 and is typical marking values of crust source. 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 measures samples show the outburst gas comes from the burnt rock and is a kind of mixed type gas; The fission-track ages of the Secondary Calcite Veins and the 40Ar/ 36Ar Value of the gas show that the outburst gas formed from Neogene to early Pleistocene; The coal beds, fractures and high pressure Jointly control the accumulation of the gas.
Drilling front test well, blasting shiver and pumping to reduce pressure and so on are positive role to preventing CO2 outburst. The fracture zones in the coal beds are the most dangerous position which must be on guard.
出处
《自然灾害学报》
CSCD
1994年第3期85-89,共5页
Journal of Natural Disasters
基金
国家自然科学基金
关键词
煤矿
二氧化碳突出
突出防治
CO_2 outburst Yaojie coalmine Gas of burnt coal measures Prevention and cure of outburst Structural geochemistry
