Stability analysis when tunnelling in soft soil condition in Hochiminh city

Ngan Minh Vu
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Abstract

The rapid development in the economy and the urban population in cities in Vietnam in recent years leads to dramatic growth in traffic congestion, noise and air pollution, and environmental degradation. Urban underground infrastructure thus becomes an inevitable solution since the surface space becomes too expensive and restricted in spite of the high cost of tunnel construction. However, tunnelling in deltaic urban areas, in particular in the cases of Mekong Delta and Red River Delta areas, often faces to difficulties of soft soil conditions and the existence of important historical buildings on the surface. The first metro line constructed in Vietnam from Ben Thanh to Suoi Tien, which is located under crowded areas of Hochiminh city, was tunnelled in such conditions. This paper presents a back analysis for the stability of the tunnelling process in the project. The minimum support pressures is estimated by using the wedge model proposed by Jancsecz, S., & Steiner, W. (1994). Meanwhile, the maximum support pressure is estimated by the blow-out model proposed by Vu et al. (2016). Based on these results, the range of support pressures recommended for the Earth Pressure Balance Tunnel Boring Machine in the Hochiminh Metro Line No.1 project soft soil conditions is derived and compared to in situ support pressures obtained from the monitoring data in this tunnelling project. The study result shows a good agreement between the support pressures obtained from stability analysis models and the monitoring data from the construction site. Based on this back analysis, some recommendations are proposed with the purpose of successful construction in the next tunnelling projects in Hochiminh city.
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胡志明市软土条件下隧道开挖稳定性分析
近年来,越南经济和城市人口的快速发展导致交通拥堵、噪音和空气污染以及环境恶化等问题急剧增加。因此,尽管隧道建设成本高昂,但由于地面空间过于昂贵和有限,城市地下基础设施成为必然的解决方案。然而,在三角洲城市地区,特别是湄公河三角洲和红河三角洲地区,隧道施工往往面临软土条件和地表存在重要历史建筑的困难。越南第一条从滨城到索田的地铁线路,位于胡志明市的拥挤地区,就是在这样的条件下开挖的。本文对该工程掘进过程的稳定性进行了反分析。最小支撑压力是通过使用Jancsecz, S.和Steiner, W.(1994)提出的楔形模型来估计的。同时,最大支护压力由Vu等(2016)提出的井喷模型估算。在此基础上,导出了胡志明市地铁1号线软土条件下土压平衡式隧道掘进机的推荐支护压力范围,并与该隧道工程监测数据获得的现场支护压力进行了比较。研究结果表明,稳定分析模型得到的支护压力与现场监测数据吻合较好。在此基础上,提出了一些建议,以期在胡志明市的下一个隧道工程中取得成功。
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