防治高水压下掌子面塌方的隧道施工方案研究

发布时间：2018-06-05 23:32

本文选题：数值模拟 + 高水压　；参考：《重庆交通大学》2014年硕士论文

【摘要】：改革开放以来，为了适应当代社会的高速发展，修建了很多隧道工程。而在修建隧道的过程中，出现了很多问题。其中隧道掌子面塌方是隧道工程最常见的问题之一。隧道掌子面塌方的因素包括地质水文因素、施工因素、设计因素及认识与管理因素。本文主要研究的问题研究水压力对隧道掌子面稳定性的影响，从而提出相关的施工防治措施。针对这一问题，提出了通过有限差分软件FLAC3D来模拟隧道开挖时，水压力是如何影响隧道掌子面稳定性的。而本文主要研究的内容如下： ①不同围岩等级的公路隧道在高水压作用下掌子面附近围岩的力学行为及稳定情况分析、评价； ②研究在高水压作用下，不同围岩等级的公路隧道掌子面失去稳定性的临界作用值； ③不同尺寸断面的公路隧道在高水压作用下掌子面附近围岩的力学行为及稳定情况分析、评价； ④研究在高水压作用下，不同尺寸断面的公路隧道掌子面失去稳定性的临界作用值； ⑤在大于掌子面失去稳定性的水压力临界作用值时，采用何种施工方案；在小于掌子面失去稳定性的水压力临界作用值时，采用何种施工方案。经过FLAC3D软件数值模拟后，得出了中等断面、大断面、特大断面三种隧道断面形式下常见的三、四、五级围岩情况的隧道掌子面失稳的临界水压力值；以及各种工况下公路隧道在高水压作用下掌子面附近围岩的力学行为。并对公路隧道在隧道掌子面失稳的临界水压力值的力学行为作出了一定的分析、评价；提出了在水压力小于掌子面失稳的水压力临界值时，，可以考虑先开挖后支护的施工方案；但是当水压力大于掌子面失稳的水压力临界值时，则必须采取先对掌子面进行支护然后再开挖的施工方案。
[Abstract]:Since the reform and opening up, in order to adapt to the rapid development of contemporary society, many tunnel projects have been built. And in the construction of the tunnel, there are many problems. The tunnel face collapse is one of the most common problems in tunnel engineering. The factors of tunnel face collapse include geological and hydrological factors, construction factors, design factors, cognition and management factors. This paper mainly studies the influence of water pressure on tunnel face stability, and puts forward relevant construction prevention measures. In order to solve this problem, a finite difference software (FLAC3D) is proposed to simulate the stability of tunnel face when the water pressure is used to simulate the tunnel excavation. The main contents of this paper are as follows: (1) Analysis and evaluation of mechanical behavior and stability of surrounding rock near palm face of highway tunnel with different surrounding rock grade under high water pressure; (2) under the action of high water pressure, the face of highway tunnel face of different surrounding rock grade lose the critical action value of stability; (3) Analysis and evaluation of the mechanical behavior and stability of surrounding rock near the face of highway tunnel with different sizes under the action of high water pressure; (4) under the action of high water pressure, the critical action value of the stability of the face of highway tunnel with different cross section is lost. 5When the critical action value of water pressure is larger than the critical action value of water pressure on the face of the palm, which construction scheme is adopted, and what construction scheme is adopted when the critical action value of water pressure is smaller than the critical action value of water pressure on the face of the palm. After the numerical simulation of FLAC3D software, the critical water pressure values of tunnel face instability are obtained under the three types of tunnel cross section: medium section, large section and large section, which are common in three types of tunnel sections: third, fourth and fifth grade surrounding rock. And the mechanical behavior of surrounding rock near the face of highway tunnel under high water pressure under various working conditions. The mechanical behavior of the critical water pressure of tunnel face instability is analyzed and evaluated, and the construction scheme of excavation and support is considered when the water pressure is less than the critical value of water pressure which is unstable on the face of the tunnel. However, when the water pressure is greater than the critical value of the water pressure of the face, the construction scheme of supporting the face of the face and then excavating must be adopted.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

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