三孔小净距隧道合理净距确定与爆破振动响应研究

【作者】 赵镇林；

【导师】 杨小礼；

【作者基本信息】 中南大学 ， 土木工程， 2011， 硕士

【摘要】 近年来,小净距隧道已经成为研究的热点。然而,由于这类隧道结构型式较为特殊,各邻近隧道施工相互影响大,在设计和施工过程中均存在许多关键问题需要解决,因此,对该型隧道进行有针对性的研究显得十分必要。本文依托于南京韩府山隧道群工程,通过理论分析、数值模拟和现场测试相结合的方法,对三孔小净距隧道合理净距的确定做了细致、有针对性的研究。本文所做具体工作如下：(1).对研究三孔小净距的合理净距的研究价值及国内外的研究现状进行了较为详细的阐述；同时通过运用FLAC3D模拟,对影响并行三孔小净距隧道合理净距的各方面因素做了分析对比。确定了三孔小净距合理净距大小,为类似工程提供参考。(2).结合韩府山隧道群爆破振动的实际监测,分析对比了爆破时邻近洞室的不同部位、不同测点的动态响应,分析了爆破应力波对邻近洞室不同部位所产生的影响。(3).以韩府山三孔小净距隧道为依托工程,通过运用MIDAS/GTS进行模拟,分析了爆破动荷载给不同净距下邻近洞室所产生的影响,得出了一些有益结论。研究成果对设计与施工小净距隧道有一定的参考价值。更多还原

【Abstract】 The neighborhood tunnel has become a research hotspot in recent years. However, near tunnels impact each other greatly when being excavated because of its specialty of this tunnel structure. Dozens of key questions are to be solved in the design and construction process, so it is highly necessary to typically study the neighborhood tunnel.Based on Hanfushan tunnels, this paper has done delicately research on its reasonable spacing of the three-hole neighborhood tunnel with the method of theoretical analysis, numerical simulation and theatre test at the scene.In this thesis, the main contents are followed:Firstly, research value and research status on three-hole parallel neighborhood tunnels have been elaborated in detail. Meanwhile, using FLAC3D, we’ve analyzed and compared the factors impacting the reasonable spacing of three-hole neighborhood tunnels, determined a reasonable spacing of the three-hole parallel neighborhood tunnel, so as to provide a reference for the similar project concerned.Secondly, according to the actual monitoring of blasting vibration of Hanfushan tunnels, the dynamic responses of different points and different parts in adjacent chambers have been analyzed and compared. The influence of blasting stress wave on adjacent chambers has been researched as well.Thirdly, Based on Hanfushan three-hole neighborhood tunnels, applying MIDAS/GTS, we’ve analyzed the influence on adjacent chambers with different spacing by blasting loads. Useful conclusions have been attained, offering certain reference value to the design and construction of neighborhood tunnels.更多还原