红石岩隧道可燃气地质特征及防灾措施  

Geologic characters of Hongshiyan Tunnel with combustible gas and its hazard prevention measures

作　　者：王宇林[1] 姜志刚[1] 赵忠英[1] 

机构地区：[1]辽宁工程技术大学资源与环境工程学院,辽宁阜新123000

出　　处：《自然灾害学报》2008年第2期78-82,共5页Journal of Natural Disasters

摘　　要：针对大别山地区红石岩隧道在新元古代二长片麻岩层掘进过程中,多次发生爆破引起可燃气涌出和燃烧的现象,为预防可燃气喷出或爆炸事故,将天然气地质学的基本原理和分析方法应用于工程地质领域。在阐明该地区地质条件和可燃气特征的基础上,揭示了断层及节理密集带构成的岩石破碎带是游离态可燃气的储集场所、破碎带及其附近岩石的片麻理为吸附态可燃气提供了赋存空间;进而论述了破碎带外侧的致密岩石以及充填、覆盖破碎带的第四系含水粉质粘土层构成了可燃气的封闭因素;根据该地区无沉积岩系存在和可燃气中CO的含量较高的事实,认为可燃气具有深源无机成因的属性,并结合地质构造的发育特征对其成因机理进行了探讨;最后,提出在施工过程中应坚持对可燃气跟踪检测,加强通风,并对施工前方岩石破碎带进行预测研究,在接近破碎带的掘进面打深孔,对可能存在的可燃气实施提前探测、抽放等有效措施,以防止诱发地质灾害。In driving course of Hongshiyan Tunnel in neoproterozotic monzonitic gneiss in Dabie Mountain area, the eruption and combusion of combusible gas occurred frequently. In order to avoid blast accident, the authors apply the basic principle and analytic method of natural gas geology to the ficld of engineering geology in order to prevent eruption, extrusion and explosion of combustible gas. On the basis of illustrating geological conditions and characters of combustible gas, the paper reveals that zone of rock fracture formed by faulted and jointed dense zone is the reservoir room of combustible gas in free form and gneissic schistosity provides stored space for combustible gas in adsorption form in zone of rock fracture or nearby. Then it discusses that dense rock outside zone of fracture and water - bearing silty clay band in quaternary system packing and covering crushed zone are composed of the confining factors of combustible gas. According to the fact that no sedilnentary rock system in existence and high content of carbon monoxide in combustible gas, it considers that combustible gas has anatectic and abiotic origin property and discusses the genesis mechanism of combustible gas on the basis of characters of geological structure＇ s development. In the end the paper puts forward some effective lneasures that we should insist on tracking and inspecting of combustible gas, enhance ventilation, predict the zone of rock fracture at the front of driving face and dig deep bore to detect and release combustible gas that may be have in the driving face near the zone of rock fracture and so on in the construction work to prevent induced geologic hazard.

关 键 词：隧道 片麻岩 无机成因可燃气 储集与封盖条件 地质灾害预防 

分 类 号：X43[环境科学与工程—灾害防治]