基于支护结构响应的连拱隧道爆破控制研究
发布时间：2019-02-18 13:54
【摘要】：随着我国国民经济的快速发展,交通建设面临着巨大的机遇与挑战。在一些特殊的地段,由于受地形及线型的限制,往往需要采用连拱隧道的结构形式。钻爆法是连拱隧道的开挖的常用方法,但由于连拱隧道结构的特殊性,在后行洞爆破开挖过程中,爆破振动必然会对中隔墙和先行洞衬砌结构产生较大的影响,当爆破振动达到一定程度时可对其造成损伤。因此,研究如何降低爆破振动对连拱隧道的冲击响应就有着重要的现实意义。本文以天鹅连拱隧道为工程背景,利用ANSYS/LS-DYNA软件,建立三维模型,采用隐式与显示相结合的计算方法,对如何控制连拱隧道爆破振动响应进行了较为深入的探讨和研究。本文主要工作如下:(1)建立模型模拟现场爆破施工,并通过与现场监测数据的对比,验证了模型的合理性。(2)针对20种不耦合装药结构,分析了不耦合系数对中隔墙及先行洞二衬的影响,并给出了不耦合系数的优化取值范围。(3)为降低爆破振动响应强度,在采用合理的不耦合装药结构的基础上,对分步开挖方案进行了优化研究,并提出了合理的开挖方案。(4)为进一步控制爆破振动,进而又对微差间隔时间进行了探讨,通过对10种不同微差间隔时间的分析,给出了微差间隔时间的取值范围。(5)基于中隔墙和先行洞二衬的爆破振动影响范围与最大振速,对比分析了几种爆破振动控制方案的减振效果,为隧道爆破方案的优化选取,提供了理论依据。
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.6
本文编号：2425907
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.6
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