摘要
张吉怀铁路古阳隧道渣场在初期堆积后发生了自燃现象,为研究其自燃机理并对渣场进行彻底整治,消除渣场自燃对周边环境的不良影响,通过现场勘查、实验测试、理论分析等方法,对古阳隧道渣场渣样的自燃倾向及矿物成分、渣场自燃形成机理进行分析,确定最终整治方案。数据表明,该渣场自燃等级为Ⅱ类,硫化铁硫Sp.ad为1.70%~3.88%,样品空气干燥基固定碳FCad为5.14%~9.61%,烧失量为10.04%~10.62%;黄铁矿通过表面吸氧氧化释放大量的热量,热量聚积温度持续升高达到着火温度T_s后渣场发生自燃。根据研究成果,确定了古阳隧道渣场“整平封闭、隔氧隔水”的治理思路。渣场整平后铺0.3 m厚生石灰,然后覆盖一层1.5 m厚黏土,最上层覆盖0.5 m种植土,渣场表面采用“撒草籽+栽植灌木”的方式防护。
The slag field of the Guyang Tunnel of Zhangjiajie-Jishou-Huaihua Railway had spontaneous combustion in the early stage after accumulation.In order to study the mechanism of spontaneous combustion and thoroughly rectify the slag field,to eliminate the adverse effects of spontaneous combustion of slag field on the surrounding environment,the spontaneous combustion tendency and mineral composition of the slag samples,as well as the formation mechanism of spontaneous combustion in the slag field were analyzed by on-site investigation,experimental testing and theoretical analysis,and the final remediation plan was determined.The data showed that the spontaneous combustion grade of the slag field was ClassⅡ,the sulfur Sp.ad of iron sulfide was 1.70%to 3.88%,the air-dry base fixed carbon FCad was 5.14%to 9.61%,and the amount of the samples lose on ignition was 10.04%~10.62%.The pyrite released a lot of heat through surface oxygen absorption and oxidation,and the heat accumulation led to a continuous increase in temperature,spontaneous combustion occurrred in the slag field after reaching the ignition temperature Ts.According to the research results,the general idea of the permanent treatment plan for the slag yard was to level and close,with oxygen and water isolation.After leveling,the surface of the slag yard was spread with 0.3 m thick quicklime,then covered with a layer of 1.5 m thick clay,and the uppermost layer was covered with 0.5 m planting soil.
作者
汪莹鹤
李时亮
李炜
张良平
WANG Yinghe;LI Shiliang;LI Wei;ZHANG Liangping(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;The Coal Geologic Exploration Institute of Hunan Province,Changsha 410014,China)
出处
《铁道标准设计》
北大核心
2023年第12期163-167,195,共6页
Railway Standard Design
基金
国家重点研发计划项目(2021YFB2600400)
中铁第四勘察设计院集团有限公司科技研究开发项目(2020K042)。
关键词
铁路隧道
弃渣场
炭质页岩
黄铁矿
自燃机理
railway tunnels
waste dumps
carbonaceous shale
pyrite
spontaneous combustion mechanism
