本文選題：小凈距隧道　切入點(diǎn)：先行洞　出處：《重慶交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在交通運(yùn)輸領(lǐng)域中的高等級(jí)公路建設(shè)無疑是龍頭性產(chǎn)業(yè),同樣也在改善人民生活質(zhì)量中起著重要作用。在山區(qū)高等級(jí)公路建設(shè)中,由于地形和地質(zhì)條件的限制條件較多,使得相鄰近隧道間的凈距在設(shè)計(jì)時(shí)不能滿足規(guī)范的要求,因此小凈距隧道應(yīng)運(yùn)而生。小凈距隧道在爆破開挖時(shí)會(huì)產(chǎn)生能量波,引起爆破點(diǎn)的附近洞室產(chǎn)生巨大的振動(dòng),因此在小凈距隧道的施工過程中,必須做好先行洞和后行洞的爆破設(shè)計(jì)和爆破振動(dòng)監(jiān)測(cè),才能有效的保證施工的安全。本文以重慶市雙碑隧道工程為依托,首先對(duì)現(xiàn)場(chǎng)隧道爆破振動(dòng)監(jiān)測(cè)數(shù)據(jù)進(jìn)行分析,然后運(yùn)用瞬態(tài)有限元分析軟件MIDAS/GTS,建立雙碑隧道工程的數(shù)值模擬模型,研究在不同工況條件下隧道后行洞爆破開挖時(shí),隧道先行洞的初期支護(hù)結(jié)構(gòu)動(dòng)力響應(yīng)規(guī)律,下列為具體研究的問題:①研究小凈距隧道在不同埋置深度條件下,后行洞爆破開挖時(shí),其先行洞初期支護(hù)結(jié)構(gòu)振動(dòng)速度變化規(guī)律,及各關(guān)鍵點(diǎn)的振動(dòng)規(guī)律。②研究小凈距隧道先行洞采用不同的支護(hù)形式時(shí),后行洞爆破開挖引起的先行洞初期支護(hù)的速度和位移變化規(guī)律。③研究小凈距隧道掌子面在不同縱向間距下,后行洞爆破對(duì)先行洞初期支護(hù)的影響,得到合理縱向間距與隧道開挖寬度之間的關(guān)系,為同類型的隧道爆破設(shè)計(jì)提供一定指導(dǎo)。④研究小凈距隧道在不同圍巖級(jí)別情況下,后行洞爆破對(duì)先行洞初期支護(hù)的影響,以及先行洞初期支護(hù)振速沿縱向方向的變化規(guī)律。
[Abstract]:The construction of high-grade highways in the field of transportation is undoubtedly a leading industry and also plays an important role in improving the quality of life of the people. In the construction of high-grade highways in mountainous areas, there are many restrictions due to the terrain and geological conditions. The net distance between adjacent tunnels can not meet the requirements of the specification in design, so the small net distance tunnel emerges as the times require. When the tunnel is excavated by blasting, it will produce energy wave, which will cause huge vibration in the nearby cavern of blasting point. Therefore, in the construction process of small clear distance tunnel, the blasting design and blasting vibration monitoring of first and rear tunnel must be done well in order to ensure the safety of construction effectively. Firstly, the monitoring data of blasting vibration in the field tunnel are analyzed, and then the numerical simulation model of double-tablet tunnel engineering is established by using the transient finite element analysis software Midas / GTS.When the tunnel is excavated after blasting under different working conditions, The dynamic response law of the initial supporting structure of the tunnel advance tunnel is as follows. The following is the specific research question: 1 to study the variation law of the vibration velocity of the supporting structure in the early stage of the tunnel under the condition of different buried depth of the tunnel with small net distance and when the tunnel is excavated by blasting. And the vibration law of each key point. 2. When the tunnel with small clear distance adopts different supporting forms, Study on the change of the velocity and displacement of the initial support of the first tunnel caused by the blasting excavation of the rear tunnel; the influence of the blasting on the initial support of the advance tunnel under the different longitudinal spacing of the face of the tunnel with small net distance. The relationship between the reasonable longitudinal spacing and the width of tunnel excavation is obtained, which provides certain guidance for the design of the same type of tunnel blasting. 4. The influence of the rear tunnel blasting on the initial support of the advance tunnel under different surrounding rock levels is studied. And the variation law of the initial supporting speed along the longitudinal direction.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.6

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相關(guān)期刊論文 前1條

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本文編號(hào)：1650784