富水砂层土压平衡盾构掘进沉降分析与控制

发布时间：2018-09-11 17:04

【摘要】：盾构掘进机是一种隧道掘进的专用工程机械,现代盾构掘进机集机、电、液、传感、信息技术于一体,具有开挖切削土体、输送土碴、拼装隧道衬砌、测量导向纠偏等功能。盾构掘进机己广泛用于地铁、铁路、公路、市政、水电隧道工程。在盾构掘进过程中,由于土压平衡盾构机的局限性、地层适应性限制,在砂层掘进中,沉降较难以控制。根据一般经验,在盾构掘进中和盾尾通过后都有较大沉降。根据前期施工中跟踪测量结果显示,盾构在砂层中掘进,盾构前方20m左右有明显沉降,约3～5mm。掘进过程中刀盘位置沉降约4～13mm,同步注浆后沉降有收敛,盾尾拖出15m后沉降基本稳定。地面沉降主要受工程地质、水文地质、管片衬砌注浆质量、盾构机姿态控制等方面的影响。本文结合南宁市轨道交通一号线西民盾构区间地面沉降的工程实例,从盾构工法特性、同步注浆、盾构姿态及线路走向等方面着手,重点对土压平衡盾构施工过程中产生的地面沉降的现象、影响因素及应对措施进行分析研究,为解决盾构在砂层中地面沉降的问题提供一些参考建议。
[Abstract]:The shield tunneling machine is a kind of special construction machinery for tunneling. The modern shield tunneling machine integrates the machine, electricity, liquid, sensing and information technology. It has the functions of cutting soil mass, conveying earth ballast, assembling tunnel lining, measuring and correcting deviation, etc. Shield tunneling machine has been widely used in subway, railway, highway, municipal, hydropower tunnel engineering. In the process of shield tunneling, because of the limitation of earth pressure balance shield machine and the limitation of stratum adaptability, it is difficult to control the settlement in sand excavation. According to general experience, there is a large settlement in shield tunneling and after shield tail passage. According to the results of tracing and surveying in the early construction, the shield tunneling in sand bed has obvious settlement about 20 m in front of shield, about 3 ~ 5 mm in front of shield. In the process of excavation, the position of the cutter head is about 413mm, the settlement after synchronous grouting converges, and the settlement is stable after the shield tail is towed out for 15m. Land subsidence is mainly affected by engineering geology, hydrogeology, grouting quality of segment lining, attitude control of shield machine and so on. Combined with the engineering example of ground subsidence in the west miner shield section of Nanning Rail Transit Line 1, this paper starts with the characteristics of shield tunneling method, synchronous grouting, shield posture and route direction, and so on. The phenomenon of ground subsidence during the construction of earth pressure balance shield, the influencing factors and the countermeasures are analyzed and studied, which provides some reference suggestions for solving the problem of ground subsidence of shield in sand bed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.43

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