本文關鍵詞： 下穿隧道 路基動力響應 不耦合裝藥 微差爆破 掏槽減震　出處：《重慶大學》2014年碩士論文　論文類型：學位論文

【摘要】：由于地形、地質條件限制和選線要求，將出現(xiàn)大量新建隧道下穿既有交通線的情況。然而下穿隧道與既有交通線凈距通常較小，礦山法爆破施工產生的爆破地震波將嚴重威脅既有交通線的穩(wěn)定和運營安全。因此，研究下穿隧道爆破施工引起既有交通線的動力響應及其控制技術，具有重要意義。本文以背陰坡隧道下穿滬-昆高速公路段為依托工程，采用現(xiàn)場調研、理論分析和數(shù)值模擬等方法，對下穿隧道爆破施工引起既有山區(qū)高速公路路基的動力響應規(guī)律及控制技術進行了較為系統(tǒng)深入的研究。本文主要研究內容和成果如下： ①通過數(shù)值模擬研究得到下穿隧道與既有高速公路路基不同相對位置時隧道爆破施工引起既有高速公路路基的動力響應規(guī)律。 ②通過數(shù)值模擬得到耦合裝藥結構不同裝藥量，下穿隧道爆破施工引起既有高速公路路基的最大振速。運用MATLAB擬合得到耦合裝藥結構下裝藥量與既有路基最大振速之間的數(shù)學關系式。并基于振速限值得到耦合裝藥結構的單段最大裝藥量。 ③研究多種徑向不耦合系數(shù)，，下穿隧道爆破施工引起既有高速公路路基的動力響應。通過MATLAB擬合得到徑向不耦合系數(shù)與減震系數(shù)(裝藥量相同時，不耦合裝藥爆破引起的最大振速與耦合裝藥爆破引起的最大振速的比值)之間的數(shù)學關系式。 ④通過數(shù)值模擬得到下穿隧道不同間隔時間的微差爆破引起既有高速公路路基的動力響應。結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動，但最佳間隔時間并非定值。 ⑤通過數(shù)值模擬研究得到隧道周邊掏槽深度和寬度的改變，對下穿隧道爆破施工引起既有高速公路路基最大振速的影響規(guī)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.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.6;U416.1

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