高海拔特长公路隧道内施工环境测试与分析

Monitoring and Analysis of Work Environment in High Altitude Super-long Highway Tunnel

白茫雪山3#特长公路隧道施工面临高海拔、低温、低含氧量、低气压等问题。为采取必要措施改善施工环境,开展了隧道内O_2体积分数、CO体积分数、湿度及温度的现场测试。结果表明:隧道内湿度稳定在80%左右,温度多在10℃以上,满足混凝土强度增长要求,但需加强冬季隧道内温度的监测;隧道掘进400 m以后O_2体积分数呈线性降低,CO体积分数急剧增大,均不满足规范要求,需加大通风量。

The construction of Baimang temperature, low oxygen density, low environment,field tests were carried out xueshan super-long highway tunnel faces the problems of high altitude ,low pressure and so on. To take necessary measures to improve the work to obtain the volume fracdon of 02 and CO, humidity and temperature in tunnel. The results show that humidity in tunnel was stable about 80%, and temperature was more than 10 ℃. The humidity and temperature met requirements of concrete strength growth. But it is necessary to strengthen the monitoring of environmental temperature in winter. While the excavation length was over 400 m, the volume fraction of 02 decreased linearly and the volume fraction of CO increased sharply, which could not meet the requirements of specifications. So the ventilation flow must be increased.