高地温隧道综合施工技术研究报告.doc

高地温隧道综合施工技术研究报告

摘要:本文针对禄劝铅厂引水隧洞突发性高地温地质情况,分析了高地温的热源及产生原因,说明了高地温给施工带来的困难及危害;介绍了施工中采取的各种综合技术措施,研究探讨了高地温隧道通风降温计算方法及应用,进行了用于指导施工的通风降温计算。可供类似工程参考。
关键词:高地温隧道无轨运输综合技术通风降温
The high ground temperature tunnel synthesizes the technology memoir being under construction
China Railway 16th Group C0,Ltd Yangchangshun
Abstract: The main body of a book the tunnel has dashed forward specifically for the Lu Quan lead factory draws water sending out high nature ground temperature geology condition , has analysed the high ground temperature heat source and has produced cause , difficulty and damage having explained that the high ground temperature is brought about by construction; Synthesis technology measure having introduced various adopting in construction, the ground temperature tunnel ventilation having studied investigation and discussion highly cools down calculating method and applies, the cooling having carried out the ventilation being used to guide to be under construction secretly schemes against. May provide the similar project reference.
Keywords: high ground temperature tunnel,trackless transportation, synthesis technology ,be ventilated cooling down
1 工程概况
禄劝铅厂水电站工程位于云南省昆明市禄劝县境内的普渡河下游,电站装机容量2×57MW,工程规模为中型。我单位施工的C2、C3标为发电厂引水隧洞SD0+100~SD5+690段,隧洞开挖为圆形断面,开挖直径为786㎝~810㎝,初期支护断面770㎝。发电引水普渡河左岸,隧洞沿线地表坡度变化大,前后段山体宽厚,中部缓和,冲沟切割较深,岩体倾向右岸,形成有前后两级陡岩组成的向普渡河倾斜的大斜坡地貌,隧洞最大埋深
380m,由三条支洞施工,洞身穿过围岩岩性为震旦系灯影组,含硅质条带白云岩,岩体性脆、质硬。受区域断裂影响,隧洞附近猫得村处河左岸出露一热泉,其矿化度较高;库外枢纽下游多处发育热泉,含硫量大,矿化度高,出露于普渡河背斜倾伏段。
普渡河流域地处低纬亚热带高原湿润季风气候区。本流域具有年降雨量集中程度高,光热资源条件好,降雨量丰富,干湿季分明的特点。根据气象站资料统计,~℃之间,~℃之间,极端最低气温在-~℃之间,最热月(7月)℃,最冷月(1月) ℃,,。
该项目于2007年1月开工,采用无轨运输施工,2008年1月~12月为高地温围岩施工期。高地温地段以外,围岩一般温度为22~23℃,按30℃以上为高低温段,高地温地段里程为SD1+300~SD2+500;其中,70℃以上高温岩层地段为SD1+734~SD1+842,该段局部围岩极端温度达76℃,上报资料75℃为平均值;K1+500~K2+100段有少量裂隙水,水温最高达70℃;高地温岩层分别由1#、2#支洞施工,分界里程为SD2+100, 分界点围岩温度为40℃。
附:开挖断面图(临时支护)
2 高地温的热源
⑴火山热的热源:由于火山供给的热是地下岩浆集中处的热能而产生的热水,这种热水(泉水