下穿隧道爆破施工引起既有山区高速公路路基的动力响应及控制研究

发布时间：2018-02-27 00:29

本文关键词： 下穿隧道路基动力响应不耦合装药微差爆破掏槽减震　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于地形、地质条件限制和选线要求，将出现大量新建隧道下穿既有交通线的情况。然而下穿隧道与既有交通线净距通常较小，矿山法爆破施工产生的爆破地震波将严重威胁既有交通线的稳定和运营安全。因此，研究下穿隧道爆破施工引起既有交通线的动力响应及其控制技术，具有重要意义。本文以背阴坡隧道下穿沪-昆高速公路段为依托工程，采用现场调研、理论分析和数值模拟等方法，对下穿隧道爆破施工引起既有山区高速公路路基的动力响应规律及控制技术进行了较为系统深入的研究。本文主要研究内容和成果如下： ①通过数值模拟研究得到下穿隧道与既有高速公路路基不同相对位置时隧道爆破施工引起既有高速公路路基的动力响应规律。 ②通过数值模拟得到耦合装药结构不同装药量，下穿隧道爆破施工引起既有高速公路路基的最大振速。运用MATLAB拟合得到耦合装药结构下装药量与既有路基最大振速之间的数学关系式。并基于振速限值得到耦合装药结构的单段最大装药量。 ③研究多种径向不耦合系数，，下穿隧道爆破施工引起既有高速公路路基的动力响应。通过MATLAB拟合得到径向不耦合系数与减震系数(装药量相同时，不耦合装药爆破引起的最大振速与耦合装药爆破引起的最大振速的比值)之间的数学关系式。 ④通过数值模拟得到下穿隧道不同间隔时间的微差爆破引起既有高速公路路基的动力响应。结果表明微差爆破能降低下穿隧道爆破施工引起既有高速公路路基的振动，但最佳间隔时间并非定值。 ⑤通过数值模拟研究得到隧道周边掏槽深度和宽度的改变，对下穿隧道爆破施工引起既有高速公路路基最大振速的影响规律。
[Abstract]:Due to topography, geological conditions and route selection requirements, there will be a large number of new tunnels passing through existing traffic lines. However, the net distance between the underpass tunnel and the existing traffic line is usually relatively small. The blasting seismic wave generated by mine blasting will seriously threaten the stability and operation safety of existing traffic lines. Therefore, the dynamic response and control techniques of existing traffic lines caused by blasting under tunnel are studied. It is of great significance. In this paper, based on the project of Hu-Kun Expressway, the method of field investigation, theoretical analysis and numerical simulation is adopted. The dynamic response law and control technology of highway roadbed in existing mountainous area caused by blasting construction of underpass tunnel are studied systematically and deeply. The main contents and results of this paper are as follows:. The results are as follows: (1) through numerical simulation, the dynamic response law of existing expressway roadbed caused by tunnel blasting is obtained when the underpass tunnel is different from the existing highway roadbed. (2) through numerical simulation, the different charge quantity of coupling charge structure is obtained. The maximum vibration velocity of existing highway roadbed caused by blasting construction of underpass tunnel is obtained by using MATLAB fitting. The mathematical relation between the loading quantity of coupling charge structure and the maximum vibration velocity of existing roadbed is obtained, and the coupling is obtained based on the limit value of vibration velocity. Maximum single stage charge of charge structure. 3. Many radial uncoupling coefficients are studied, and the dynamic response of existing highway subgrade caused by blasting construction of underpass tunnel is studied. By MATLAB fitting, the radial uncoupling coefficient and the damping coefficient are obtained when the charge quantity is the same. The mathematical relation between the maximum vibration velocity caused by the uncoupled charge blasting and the ratio of the maximum vibration velocity caused by the coupling charge blasting. Through numerical simulation, the dynamic response of existing expressway roadbed caused by millisecond blasting at different intervals is obtained. The results show that millisecond blasting can reduce the vibration of existing expressway roadbed caused by underpass blasting. But the best interval is not fixed. 5 through numerical simulation study, the change of cutting depth and width around the tunnel is obtained, which affects the maximum vibration velocity of existing expressway roadbed caused by blasting construction of underpass tunnel.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.6;U416.1

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