【摘要】 研究目的:针对杭州地铁1号线在部分区段地面以下15~30 m的土层中存在浅层气,会对地铁站、隧道盾构施工造成影响。在综合考虑浅层气和含气土层特性的基础上,就浅层气对地铁构筑物施工影响模式进行分析,提出应采取的防治措施,保证施工安全。研究结论:地下土层中浅层气的存在,施工中如果无控释放会造成土层扰动破坏,气压较高时会造成槽壁坍塌或孔壁失稳、基坑底板隆起,如果采取的应急措施不当,将危及设备和人身安全;土压平衡盾构会对刀,盘摩阻力、出土和压力平衡产生影响,泥水平衡盾构会对局部稳定产生影响;盾构穿越含气土层时还存在安全问题。施工中采取有控释放措施,避免浅层气造成的危害。更多还原

【Abstract】 Research purposes: The shallow gas existed in the soil stratum from depth of 15m to 30m under some section of Line 1 of Hangzhou metro might have influences on the constructions of the metro stations and shield tunnels.Based on consideration to the characteristics of shallow gas and gassy soil,the influence mode of shallow gas on the construction of underground structures was analyzed and the corresponding measures were presented to prevent the disasters during the construction.Research conclusions:During the construction,the uncontrolled release of shallow gas would seriously disturb the soil layer.The distablization of the trench wall or hole wall and the upheaving of foundation ditch might happen because of the high gas pressure.Moreover,there was the hidden peril of safety accident when shielding was conducted across the gas soil layer.So,the measures like controlled release of the shallow gas had to be taken during the construction to prevent the disasters caused by the shallow gas.更多还原