【摘要】：隨著我國(guó)國(guó)民經(jīng)濟(jì)的快速發(fā)展,交通建設(shè)面臨著巨大的機(jī)遇與挑戰(zhàn)。在一些特殊的地段,由于受地形及線型的限制,往往需要采用連拱隧道的結(jié)構(gòu)形式。鉆爆法是連拱隧道的開挖的常用方法,但由于連拱隧道結(jié)構(gòu)的特殊性,在后行洞爆破開挖過(guò)程中,爆破振動(dòng)必然會(huì)對(duì)中隔墻和先行洞襯砌結(jié)構(gòu)產(chǎn)生較大的影響,當(dāng)爆破振動(dòng)達(dá)到一定程度時(shí)可對(duì)其造成損傷。因此,研究如何降低爆破振動(dòng)對(duì)連拱隧道的沖擊響應(yīng)就有著重要的現(xiàn)實(shí)意義。本文以天鵝連拱隧道為工程背景,利用ANSYS/LS-DYNA軟件,建立三維模型,采用隱式與顯示相結(jié)合的計(jì)算方法,對(duì)如何控制連拱隧道爆破振動(dòng)響應(yīng)進(jìn)行了較為深入的探討和研究。本文主要工作如下:(1)建立模型模擬現(xiàn)場(chǎng)爆破施工,并通過(guò)與現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)的對(duì)比,驗(yàn)證了模型的合理性。(2)針對(duì)20種不耦合裝藥結(jié)構(gòu),分析了不耦合系數(shù)對(duì)中隔墻及先行洞二襯的影響,并給出了不耦合系數(shù)的優(yōu)化取值范圍。(3)為降低爆破振動(dòng)響應(yīng)強(qiáng)度,在采用合理的不耦合裝藥結(jié)構(gòu)的基礎(chǔ)上,對(duì)分步開挖方案進(jìn)行了優(yōu)化研究,并提出了合理的開挖方案。(4)為進(jìn)一步控制爆破振動(dòng),進(jìn)而又對(duì)微差間隔時(shí)間進(jìn)行了探討,通過(guò)對(duì)10種不同微差間隔時(shí)間的分析,給出了微差間隔時(shí)間的取值范圍。(5)基于中隔墻和先行洞二襯的爆破振動(dòng)影響范圍與最大振速,對(duì)比分析了幾種爆破振動(dòng)控制方案的減振效果,為隧道爆破方案的優(yōu)化選取,提供了理論依據(jù)。
[Abstract]:With the rapid development of our national economy, traffic construction is facing great opportunities and challenges. In some special areas, the structure of multi-arch tunnel is often adopted because of the limitation of topography and alignment. Drilling and blasting method is a common method in the excavation of multi-arch tunnel, but because of the particularity of the structure of the double-arch tunnel, blasting vibration will inevitably have a great influence on the lining structure of the middle partition wall and the first tunnel during the excavation process of the back tunnel blasting. When the blasting vibration reaches a certain degree, it can cause damage. Therefore, it is of great practical significance to study how to reduce the impact response of blasting vibration to multi-arch tunnel. In this paper, taking the Swan multi-arch tunnel as the engineering background, using the ANSYS/LS-DYNA software, the three-dimensional model is established, and the calculation method combining implicit and display is used to study how to control the blasting vibration response of the double-arch tunnel. The main work of this paper is as follows: (1) the model is built to simulate the field blasting construction, and the rationality of the model is verified by comparing with the field monitoring data. (2) aiming at 20 kinds of uncoupled charge structures, The influence of the uncoupling coefficient on the second lining of the middle partition wall and the first tunnel is analyzed, and the optimum value range of the uncoupling coefficient is given. (3) in order to reduce the vibration response strength of blasting, the reasonable uncoupled charge structure is adopted. In order to further control the blasting vibration and further discuss the millisecond interval time, the paper analyzes 10 kinds of different millisecond interval time, and puts forward the reasonable excavation scheme. (4) in order to further control the blasting vibration, the step excavation scheme is optimized and the reasonable excavation scheme is put forward. The range of millisecond interval time is given. (5) based on the influence range and maximum vibration velocity of blasting vibration of middle partition wall and the second lining of the first hole, the vibration reduction effects of several blasting vibration control schemes are compared and analyzed. It provides a theoretical basis for the optimal selection of tunnel blasting scheme.
【學(xué)位授予單位】：西安建筑科技大學(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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