城市浅埋暗挖车站下穿既有建筑物控制爆破减震技术研究

发布时间：2018-04-02 16:02

本文选题：大跨浅埋　切入点：控制爆破　出处：《重庆交通大学》2015年硕士论文

【摘要】：重庆地处西部山区,岩质较为坚硬,隧道可采用传统矿山法、盾构和TBM等方法进行施工。在主城区若采用传统矿山法施工,尽管施工效率较高,但是对邻近建筑和周边市民的日常生活会带来较大影响,不利于和谐社会的建设。因此,在尽可能降低城市隧道在建设过程中对周边市民日常生活产生影响的前提下,开展城市隧道的施工工法研究可以有效降低建设成本、缩短建设周期,具有广阔的应用前景和较好的推广价值。本文以重庆市地铁6号线正线终点站五路口车站为依托工程开展工法研究,提出应用了大跨浅埋车站隧道爆破安全控制技术,在此基础上借助现场爆破振动监测和数值模拟分析的方法对车站在爆破开挖条件下围岩及既有邻近建筑进行爆破振动动力响应分析;通过现场监测结果和数值模拟结果对比,分析评价了减震效果,提出适合本项目的合理爆破参数。本文主要研究内容和成果如下:①通过对大跨浅埋暗挖隧道爆破安全控制技术进行研究,总结了适用于复杂城市环境条件隧道爆破施工的方法、参数,在此基础上总结了爆破效果评价的方法和包括爆破振动监测与数值模拟技术在内的爆破减震技术,并总结提出了大跨浅埋地铁车站的控制爆破减震技术。②在结构动力计算分析研究的基础上,结合五路口车站的工程概况和实际施工过程中所采用的新工法,对计算模型进行分析,选定爆破参数和确定爆破荷载的加载方式,并选定数值分析的模拟工况,提出了适合本项目数值模拟的方法。③对数值模拟结果进行分析,得出爆破开挖时的围岩位移变化特征和地表质点的动力响应规律;通过不同开挖步的分别模拟分析,得出不同开挖步序工况下地表建筑物的动力响应规律;将现场监测结果与数值模拟结果进行比对分析,提出爆破参数优化的方法。④对浅埋暗挖地铁车站施工过程中的的爆破减震效果进行分析与评价,结合现场爆破振动监测成果对爆破参数进行优化,得到了合理和优化的爆破参数,指导了工程实践并为其他类似工程提供了参考。
[Abstract]:Chongqing is located in the western mountainous area, and its rock is hard. The tunnel can be constructed by traditional mining method, shield tunneling and TBM.If the traditional mining method is used in the main urban area, although the construction efficiency is high, it will have a great impact on the neighboring buildings and the daily life of the surrounding citizens, which is not conducive to the construction of a harmonious society.Therefore, on the premise of minimizing the influence of urban tunnel construction on the daily life of the surrounding citizens, the research on the construction method of urban tunnel can effectively reduce the construction cost and shorten the construction period.It has broad application prospect and good promotion value.In this paper, based on the engineering research of five junctions of Chongqing Metro Line 6 main Line Terminal Station, the blasting safety control technology of long span shallow buried station tunnel is put forward.On this basis, the dynamic response of blasting vibration of surrounding rock and existing adjacent buildings under blasting excavation condition is analyzed by means of on-site blasting vibration monitoring and numerical simulation analysis, and the results of field monitoring and numerical simulation are compared.The shock absorption effect is analyzed and evaluated, and the reasonable blasting parameters suitable for the project are put forward.The main contents and results of this paper are as follows: 1. By studying the blasting safety control technology of large-span and shallow-buried tunnels, this paper summarizes the methods and parameters suitable for the blasting construction of tunnels under complex urban environmental conditions.On this basis, the methods of blasting effect evaluation and blasting vibration mitigation techniques including blasting vibration monitoring and numerical simulation are summarized.On the basis of structural dynamic calculation and analysis, the paper summarizes and puts forward the shock absorber technology of controlled blasting for long span and shallow buried subway station. On the basis of structural dynamic calculation and analysis, combined with the general engineering situation of the station at the five junctions and the new construction method adopted in the actual construction process,The calculation model is analyzed, the blasting parameters and loading mode of blasting load are determined, and the simulation conditions of numerical analysis are selected, and the numerical simulation method. 3 is put forward to analyze the numerical simulation results.The variation characteristics of surrounding rock displacement and the dynamic response law of ground mass during blasting excavation are obtained, and the dynamic response laws of surface buildings under different excavation sequence are obtained by simulation and analysis of different excavation steps.The field monitoring results and numerical simulation results are compared and analyzed, and the method of blasting parameter optimization is put forward. 4. The blasting damping effect in the construction process of shallow underground excavation subway station is analyzed and evaluated.The blasting parameters are optimized in combination with the results of on-site blasting vibration monitoring, and the reasonable and optimized blasting parameters are obtained, which guide the engineering practice and provide a reference for other similar projects.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U231.3;U455.6

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