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研究目的:随着城市轨道交通的发展,会出现越来越多的新线近接既有线路的结构施工。为保护环境,许多构思仔细的工法得到了广泛的应用。本文将针对具体工程分析明挖新线对既有车站结构的影响。研究方法:鉴于问题的复杂性,采用三维增量有限元弹性分析的方法,全程模拟了在既有结构存在的条件下,新线三个不同区域的不同施工方法,对既有线结构的变形进行了分析,并对新线的施工方法进行了优化。研究结果:新线分三段区域(中间及两侧)施工,其中中间区域分块开挖。在中间区域施工过程中,既有结构的隆起控制在2.67 mm以下。在整个新线施工过程中,既有结构最大隆起不是在施工完成后,而是出现在靠近中间区域先挖一侧基坑开挖完成后,为7.82 mm;改变两侧区域的施工顺序后,既有线结构的最终隆起量基本不变,但过程最大隆起量减为7.43 mm。研究结论:近距离上穿既有结构施工时,采用合适的工法可以有效地控制既有结构的隆起。在施工中,既有结构的隆起可能出现在施工过程的某一阶段。合理的施工顺序有助于控制施工过程中既有结构的最大隆起量。
Research purposes: With the development of urban rail transit, more and more new structures will appear near the existing routes. To protect the environment, many carefully crafted methods have been widely used. This article will analyze the specific project of digging new lines on the existing station structure. Research methods: In view of the complexity of the problem, three-dimensional incremental finite element method of elastic analysis was used to simulate different construction methods in three different areas under the existing structure and the deformation of existing structures Analysis, and the construction of the new line has been optimized. Research results: The new line is divided into three sections (middle and two sides), of which the middle section is divided and excavated. During the construction of the middle area, the uplift of the existing structure is controlled below 2.67 mm. During the construction of the new line, the largest uplift of the existing structure is not 7.82 mm after completion of the construction but rather after excavation of the first excavation near the middle area. After changing the construction sequence on both sides of the area, The final bulge of the existing wire structure is basically unchanged, but the maximum bulge of the process is reduced to 7.43 mm. Research conclusions: When wearing the existing structure at short distance, proper construction method can effectively control the uplift of the existing structure. In the construction, the uplift of the existing structure may appear at a certain stage of the construction process. A reasonable construction sequence helps to control the maximum lift of an existing structure during construction.