中文摘要：

杭州地铁1号线在勘察过程中发现很多区段在埋深15～35 m的土层中存在一定压力的浅层气,浅层气的存在不但对勘察的安全实施构成一定的威胁,而且会影响地铁构筑物的正常施工,如果采取的防治措施不当,还会进一步威胁到地铁的后期运营。浅层气问题是杭州地铁1号线建设中遇到的难题之一,但目前国内外在地铁建设中大范围遇到浅层气的实例还比较少,防治浅层气危害的方法和积累的经验都十分有限。在综合分析研究杭州地区浅层气和含气土层工程特性的基础上,考虑杭州地铁工程不同建设阶段的特点,结合在实际工程的经验,以及室内试验和监测结果,提出有针对性的危害防治对策,为地铁工程建设和后期运营的安全提供帮助,也可为类似地区地下工程的建设提供参考。

英文摘要：

The shallow gas with a certain pressure is found in depths of 15-35 m in many sections of Hangzhou Metro Line No.1 during the detailed exploration. It not only constitutes a threat to the safety of investigation, but also influences the normal construction of the metro structures. It will be a threat to the later operation of metro if unsuitable prevention and control countermeasures are adopted. Shallow gas is one of the challenges met in construction of Hangzhou Metro Line No. 1. However, at present, the case study with such large scale shallow gas is few in the history of metro construction at home and abroad; and the methods for preventing shallow gas disaster and the experiences are quite limited. Based on the studies of engineering properties of shallow gas and soil containing gas in Hangzhou area, considering the characteristics of Hangzhou metro engineering in different construction stages, and combining the practical engineering experience and the results of laboratory test and field monitoring, some pertinent disaster countermeasures are proposed. The countermeasures may supply assistance to metro construction and later operation, and also can give a reference to underground constructions in similar areas.