偏压隧道渗流场及其渗流偏压作用分析

发布时间：2018-04-18 15:48

本文选题：裂隙岩体 + 浅埋偏压　；参考：《吉林大学》2017年硕士论文

【摘要】：我国幅员辽阔,地形地貌条件复杂多样,且山地众多,占国土面积的2/3以上。自1826年英国建设完成了世界上首座铁路隧道以后,隧道工程得到了飞速的发展,摆脱了以往面对高山阻碍时只能选择迂回展路的方案。如今,隧道以其能抵抗不良环境、有效提高行车效率、保护自然生态环境以及提高空间利用率等诸多优势,已成为目前穿越天然障碍实现两地互连以及缓解地面空间压力的最主要手段之一。隧道作为赋存于岩土体中的一种典型地下构筑物,地下水常常伴随在其建设和使用的整个过程中。岩石本身渗透性很小,甚至可以认为是不透水的。但是对于岩体,由于其内部存在着数量不等、方向各异、成因多样的孔隙和裂隙以及规模不等的结构面和构造带,直接影响着岩体的渗透特性,使得在岩体中常会形成较大的孔隙水压力。而由此带来的工程地质问题也是最为常见且棘手的[1]。本文以鹤大高速公路回头沟隧道工程项目为依托工程,对浅埋偏压隧道渗流场以及隧道由于地下水渗流导致的偏压作用进行了系统深入的研究,其内容主要有以下几个方面:(1)本文从渗流模型、渗流基本方程以及渗流问题的定解条件等几方面对隧道围岩渗流场分析的基础理论进行了介绍。并结合相关理论,分析了裂隙岩体内渗流场和应力场的相互作用机理,阐明了基于流固耦合分析评价隧道稳定性的必要性。(2)在对回头沟隧道浅埋偏压段进行了详细的地质勘查的基础上,基于流固耦合的渗流理论,针对其典型断面在最不利的工况条件下,进行了偏压隧道渗流场分布规律的分析。(3)采用FLAC3D数值模拟的手段,通过对隧道围岩分别在考虑流固耦合下的地下水渗流和不考虑地下水渗流情况下的应力场、位移场、塑性区范围等方面的比较,结合现场监测数据分析流固耦合效应下渗流场对偏压隧道偏压效应的影响。
[Abstract]:China has a vast territory, complex landforms and mountainous areas, accounting for more than 2 / 3 of the land area.Since the completion of the first railway tunnel in the world in 1826, the tunnel project has developed rapidly, and the tunnel project has been freed from the previous scheme of detour in the face of the obstacles of the high mountains.Nowadays, the tunnel has many advantages, such as resisting the bad environment, effectively improving the driving efficiency, protecting the natural ecological environment and improving the utilization rate of space.At present, it has become one of the most important means to cross natural obstacles to realize interconnect between two places and to relieve ground space pressure.As a typical underground structure existing in rock and soil, underground water is often accompanied by the whole process of its construction and use.The rock itself is so permeable that it can even be considered impervious.However, for rock mass, due to the existence of different quantities and different directions, various pores and fissures, and structural planes and structural zones of different scales, it has a direct impact on the permeability of rock mass.The pore water pressure is often formed in rock mass.The engineering geological problems caused by it are also the most common and difficult [1].Based on the project of He-Da Expressway Guigou Tunnel, this paper makes a systematic and in-depth study on the seepage field of shallow buried tunnel and the effect of tunnel pressure caused by groundwater seepage.The main contents are as follows: (1) this paper introduces the basic theory of seepage field analysis of tunnel surrounding rock from the aspects of seepage model, seepage basic equation and definite solution condition of seepage problem.The interaction mechanism of seepage field and stress field in fractured rock is analyzed based on the related theory.The necessity of evaluating tunnel stability based on fluid-solid coupling analysis is expounded. Based on the detailed geological survey of shallow buried partial pressure section of Huigou tunnel, the seepage theory based on fluid-solid coupling is presented.In view of the analysis of the seepage field distribution of the typical section under the most unfavorable working conditions, the method of FLAC3D numerical simulation is used to analyze the seepage field distribution of the bias tunnel.In this paper, the stress field, displacement field and plastic zone range of surrounding rock of tunnel are compared in the case of considering fluid-solid coupling and without considering the seepage of groundwater, respectively.Combined with field monitoring data, the influence of seepage field on bias effect of bias tunnel under fluid-solid coupling effect is analyzed.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U452.11

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