下穿复杂条件超浅埋暗挖隧道施工技术研究

发布时间：2018-05-20 17:02

本文选题：隧道工程 + 下穿施工　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：论文以贵阳轨道交通1号线下麦西隧道为背景,通过理论分析、数值模拟和现场监测相结合的方法,对西南超浅埋隧道下穿既有建(构)筑物施工稳定性及施工对周边环境影响进行了分析和研究,主要进行的工作及取得的结论如下:(1)针对隧道穿越既有高速公路施工稳定性及施工对既有运营高速公路的影响,对浅埋隧道采用双侧壁导坑法、CRD法、CD法、台阶法等不同施工时围岩的变形和塑性区的发展以及不同施工方案时隧道支护结构的受力和变形特定的影响进行了系统分析和研究,确定了隧道穿越高速公路的施工方案,建议了施工技术,指导了该隧道的施工。跟踪施工进行的现场监测表明,建议的施工方案安全可行,施工引起的公路沉降可控。(2)针对下麦西隧道近距离穿越既有交通涵爆破施工引起的振动影响,采用数值模拟分析了隧道爆破开挖引起的既有交通涵洞结构的爆破振动响应,确定了超浅埋下穿既有大型交通涵洞大断面隧道爆破施工方案,优化爆破结构方式,给出了爆破最大振速与距离的数学关系式。(3)针对下麦西隧道穿越既有高速公路路基边坡降雨渗流失稳问题,通过数值分析研究了西南山区城镇浅埋隧道在穿越边坡过程中,在降雨入渗作用下的边坡破坏过程,提出了适合的支护方案,为施工方案的合理优化提供技术支撑。
[Abstract]:Based on the Maxi Tunnel of Guiyang Rail Transit Line 1, this paper combines the theoretical analysis, numerical simulation and field monitoring. This paper analyzes and studies the construction stability of the existing building (structure) and the influence of the construction on the surrounding environment of the ultra-shallow buried tunnel in southwest China. The main work and conclusions obtained are as follows: (1) aiming at the stability of the tunnel crossing the existing expressway and the influence of the construction on the existing operating highway, the double-sidewall pit guide method and the CRD method and CD method are used in the shallow buried tunnel. The development of deformation and plastic zone of surrounding rock under different construction conditions such as step method and the specific influence of stress and deformation of tunnel supporting structure under different construction schemes are analyzed and studied systematically, and the construction plan of tunnel crossing expressway is determined. The construction technology is suggested and the construction of the tunnel is guided. The site monitoring of track construction shows that the proposed construction scheme is safe and feasible, and the highway settlement caused by construction is controllable. 2) aiming at the vibration effect caused by the blasting construction of the short distance crossing existing traffic culvert in Lower Maixi Tunnel, The blasting vibration response of the existing traffic culvert structure caused by tunnel blasting excavation is analyzed by numerical simulation, and the blasting construction scheme of large section tunnel through existing large traffic culvert under ultra-shallow burying is determined, and the blasting structure is optimized. The mathematical relation between the maximum blasting velocity and the distance is given. Aiming at the problem of rainfall seepage instability of the roadbed slope passing through the existing highway in the Lower Maixi Tunnel, the numerical analysis is carried out to study the process of the shallow buried tunnel crossing the slope in the southwest mountainous area. In the process of slope failure under the action of rainfall infiltration, a suitable supporting scheme is put forward, which provides technical support for the reasonable optimization of construction scheme.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4

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