硬岩隧道爆破施工压入式通风CO传播规律研究
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- 英文论文题名：Study on the Propagation Law of CO with Blasting Construction in Hard Rock Tunnel
- 论文作者：邓如勇 ; 范建国 ; 雷帅 ; 方勇
- 英文论文作者：DENG Ruyong ; FAN Jianguo ; LEI Shuai ; FANG Yong ; Key Laboratory of Transportation Tunnel Engineering of Ministry of Education ; Southwest Jiaotong University
- 年：2016
- 作者机构：西南交通大学交通隧道工程教育部重点实验室;
- 论文关键词：硬岩隧道 ; 爆破施工 ; 一氧化碳 ; 传播规律
- 英文论文关键词：Hard rock tunnel ; Blasting construction ; Carbon monoxide ; Propagation law
- 会议召开时间：2016-10-24
- 会议录名称：2016中国隧道与地下工程大会（CTUC）暨中国土木工程学会隧道及地下工程分会第十九届年会论文集
- 语种：中文
- 分类号：U453.5
- 学会代码：OGTY
- 会议名称：2016中国隧道与地下工程大会（CTUC）暨中国土木工程学会隧道及地下工程分会第十九届年会
- 会议地点：中国四川成都
- 主办单位：中国土木工程学会隧道及地下工程分会
- 学会名称：中国土木工程学会
- 页数：8
- 文件大小：1791k
- 原文格式：O
- 会议级别：全国
摘要
硬岩隧道由于岩体完整性较好,岩石强度较高,采用钻爆法施工时往往存在装药过量进而造成爆破效果不理想,"硝烟弥漫"的情况。采用现场测试与数值计算相结合的方法,对压入式通风情况下,硬岩隧道爆破施工过程中产生的CO的传播规律进行了研究。数值计算结果显示,压入式通风会在射流出口区域附近产生涡流区,对CO具有一定的滞留作用,不利于CO排出;在射流风压的作用下,CO随反射风流一起以压缩波的形式向洞外流出,但由于回风向风流速度不同,CO在隧道内被"压缩、拉长",流动具有明显的扩散特性;越靠近爆破工作面,CO浓度降低速度越快,越远离爆破工作面,CO浓度下降速度越慢,与现场测试相结合,得到了监测面上CO浓度随通风时间的变化规律,为硬岩隧道施工洞内风管布置和通风时间优化提供了依据。
Due to hard rock tunnel with the better rock integrity,the higher rock strength,in the drilling and blasting construction,there are often existent the situation:even there is an excess of explosives,but the blasting effect is not ideal.Field test and numerical calculation method have been used to study the propagation law of CO in blasting construction of hard rock tunnel,which ventilation by the forced method.Numerical results have shown that,there will be several vortexes near the jet area by the forced ventilation method,which has a retention effect on CO flow,and it is not conducive to the outflow of CO.Under the action of jet wind pressure,CO together with fresh air flow to the outside in the form of compression wave.But due to the air outflow speed is different,CO is compressed and stretched,and the air flow out has obvious diffusion characteristics.The closer to the tunnel face,the faster the CO concentration decreased,but the more far away from the tunnel face,the slower the CO concentration decreased.With the combination of simulating and field test,the variation law of CO concentration with ventilation time has been studied,which provides the basis for the layout of the vent pipe and ventilation time on the tunnel construction in hard rock tunnel.
Due to hard rock tunnel with the better rock integrity,the higher rock strength,in the drilling and blasting construction,there are often existent the situation:even there is an excess of explosives,but the blasting effect is not ideal.Field test and numerical calculation method have been used to study the propagation law of CO in blasting construction of hard rock tunnel,which ventilation by the forced method.Numerical results have shown that,there will be several vortexes near the jet area by the forced ventilation method,which has a retention effect on CO flow,and it is not conducive to the outflow of CO.Under the action of jet wind pressure,CO together with fresh air flow to the outside in the form of compression wave.But due to the air outflow speed is different,CO is compressed and stretched,and the air flow out has obvious diffusion characteristics.The closer to the tunnel face,the faster the CO concentration decreased,but the more far away from the tunnel face,the slower the CO concentration decreased.With the combination of simulating and field test,the variation law of CO concentration with ventilation time has been studied,which provides the basis for the layout of the vent pipe and ventilation time on the tunnel construction in hard rock tunnel.
引文
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[3]杨年华,张志毅,邓志勇,刘慧,王中黔.硬岩隧道快速掘进的钻爆技术[J].工程爆破,2003,09(1):16-21.YANG Nianhua,ZHANG Zhiyi,DENG ZhiYong,LIU Hui,WANG Zhongqian.Drilling-and-blasting technology for rapid excavation of hard-rock tunnels[J].Engineering Blasting,2003,09(1):16-21.
[4]赵胤.长大隧道钻爆法施工参数优化研究[D].北京:北京交通大学,2010.ZHAO Ying.Optimizing research of parameters on long and large tunnel constructed by drilling and blasting method[D].Beijing:Beijing Jiaotong University,2010.
[5]宋秀清.特大断面硬岩隧道爆破参数的选用[J].路基工程,2008,(5):76-77.Song Xiuqing.Selection of blasting parameters for hard rock tunnel with super large section[J].Subgrade engineering,2008,(5):76-77.
[6]胡伟,蒋成海,钟浩,陈志刚.高速公路中硬岩隧道掘进爆破特征研究[J].中南公路工程,2006,31(1):28-30+37.HU Wei,JIANG Chenghai,ZHONG Hao,CHEN Zhigang.Study on blasting characteristic of excavation in medium-strength-rock highway tunnel[J].Central south highway engineering,2006,31(1):28-30+37.
[7]杨超,王志伟.公路隧道通风技术现状及发展趋势[J].地下空间与工程学报,2011,07(4):819-824.YANG Chao,WANG Zhiwei.Current status and development trend of ventilation technology for highway tunnel[J].Chinese Journal of Underground Space and Engineering,2011,07(4):819-824.
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[9]刘钊春,柴军瑞,贾晓梅,秦磊,孙旭曙.压入式通风掘进面有害气体浓度扩散数值模拟[J].岩土力学,2009,30(增刊2):536-539.LIU Zhaochun,CHAI Junrui,JIA Xiaomei,QIN Lei,SUN Xushu.Numerical simulation of concentration diffusion of harmful gas in heading face with forced ventilation[J].Rock and Soil Mechanics,2009,30(S2):536-539.
[10]赵子成.公路隧道管道压人式施工通风技术研究[D].成都:西南交通大学,2013.ZHAO Zicheng.The research of tubes push-construction ventilation based on highway tunnel[D].Chendu:Southwest Jiaotong University,2013.
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