城市浅埋暗挖隧道穿越既有结构物的影响及其安全控制技术研究

发布时间：2018-01-06 07:36

本文关键词：城市浅埋暗挖隧道穿越既有结构物的影响及其安全控制技术研究　出处：《西南交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,接近既有结构物进行邻近施工的工程大量涌现,各种技术难题层出不穷。近期的接近工程与过去的相比较,不仅工程规模大,而且与既有结构物的间隔距离小,既有的工程设计与施工应结合城市自身的特点有针对性的展开研究。本文以莞惠城际GZH-7标为依托,莞惠城际铁路位于珠三角地区,隧道围岩以饱和砂土层为主,隧道围岩级别跨越Ⅲ～Ⅵ级,其间下穿多个房屋密集带和5次下穿既有运营铁路。在广泛调研城市浅埋暗挖隧道下穿既有结构物的国内外研究现状基础上,以数值模拟和模型试验手段,对城市隧道下穿既有结构物的影响性进行了研究分析,提出了复杂条件下沉降控制措施。主要研究内容如下： (1)通过对隧道下穿既有结构物影响性的国内外研究现状进行调研,并结合莞惠城际GZH-7标工程特点,开展城市地下工程下穿既有结构物施工过程中施工方法、支护参数、结构物的位移、应力变化等的研究,初步分析其影响性。 (2)结合依托工程的实际情况,选择莞惠城际GZH-7标段典型饱和砂土地层建立数值仿真模型,分析隧道下穿施工对既有房屋和运营铁路的影响。 (3)选取莞惠城际GZH-7标典型断面,通过室内模型实验,分析施工过程中洞周围岩特征点和房屋监测点的位移变化值。 (4)根据现场监测数据,结合数值计算结果和模型试验结果进行综合比较分析,评估隧道下穿既有房屋和铁路的影响性,并提出复杂条件下修建城市浅埋暗挖隧道的安全控制措施,保证结构物的正常运营。
[Abstract]:In recent years, close to the existing structure of adjacent construction in large numbers, various technical problems. The project has close to emerge in an endless stream compared with the past, not only the size of the project, and the interval and the existing structure distance is small, the existing engineering design and construction should be combined with the characteristics of the city itself to study.
In this paper, Guanhui intercity GZH-7 standard as the basis, Guanhui intercity railway is located in the Pearl River Delta region, the saturated sand soil tunnel surrounding rock, tunnel surrounding rock spans III ~ VI, which in many houses with intensive and 5 crossing under the existing operation of the railway. In the extensive research on shallow buried tunnel under the city in the existing structure at home and abroad on the basis of the status quo, based on numerical simulation and model test, the influence of the existing structure of city tunnel are analyzed, put forward the settlement control measures under complex conditions. The main research contents are as follows:
(1) through the tunnel under the investigation of the domestic and foreign research status of the influence of the structure, and combined with the Guanhui intercity GZH-7 standard features of the project, to carry out the city underground engineering crossing under the existing construction method of structure construction process, supporting parameters, displacement of structures, such as stress research, a preliminary analysis of its impact.
(2) combined with the actual situation of relying on the project, we choose the typical saturated sand layer of the GZH-7 section of Donghui intercity to establish the numerical simulation model, and analyze the influence of tunnel underpass construction on the existing housing and operation railway.
(3) select Guanhui intercity GZH-7 typical section, through the indoor model experiment, analysis of displacement of surrounding rock in the construction process of feature points and housing value of the monitoring point.
(4) according to the monitoring data, the calculation results and the model test results were analyzed with numerical influence through existing housing and railway tunnel under evaluation, and put forward the construction safety control measures under complex conditions of shallow buried tunnel in the city, to ensure the normal operation of the structure.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455

【参考文献】