地热区隧道施工热害分级防护方法研究

Study on Hierarchical Prevention Method of Heat Hazard in Geothermal Tunnel Construction

当隧道掘进进入地热区,隧道施工区间的高热环境不但危害隧道工程质量,而且影响工程进度和施工安全。把握地热区隧道施工的热环境特点,采取有效、经济的热害防护措施,是地热区隧道施工技术的关键。目前,热害防护措施的选择缺乏科学依据,容易因“欠防护”而造成热害防护效果不到位,或因“过防护”而造成资源浪费。本文根据地热区施工隧道热源及施工热环境特点,提出了一种基于热害水平评价的热害分级防护方法。该方法考虑影响施工热害的关键因素,运用模糊评价法对隧道热害水平进行评价,根据热害评价结果采取与之匹配等级的热害防护措施进行防护。该方法在满足热害防护效果要求的同时,可降低热害防护成本、减少能耗。

When tunneling progresses into the geothermal areas,the high-temperature environment threatens the quality of engineering structures and the health of workers,reduces the work efficiency of staff,or impacts the normal operation of mechanical and electronic equipment.Therefore,it is significantly important to understand the heat transfer characteristics of geothermal construction tunnels for cost-effective heat-hazard-prevention measures.Based on the understanding of the thermal characteristics of geothermal construction tunnel,a method of heat-hazard prevention based on fuzzy comprehensive evaluation of heat hazards is proposed.Firstly,considering the factors of geothermal,construction conditions,subjective and objective construction workers,fuzzy comprehensive evaluations of heat hazards for different stages of tunnel excavation are carried out.Then,corresponding heat hazard prevention measures are formulated according to the heat hazard evaluation results.Finally,heat hazard evaluations and heat hazard prevention measures are constantly updated and iterative throughout construction period.While ensuring the cooling and prevention of heat hazards,the cost of heat hazard prevention measures is reduced,as well as the consumption of energy and resources,that makes the whole process of geothermal tunnel construction safe and economical.