层状围岩隧道稳定性及锚杆支护优化设计

发布时间：2018-04-23 23:36

本文选题：层状围岩隧道 + 稳定性　；参考：《河北工业大学》2015年硕士论文

【摘要】：我国国土面积广阔,这便造就我国地质结构独有的复杂性特点,其中最普遍的就是层状构造的岩石,大约占到我国国土面积的77.3%,同时也占到全世界陆地面积的约66.6%。由于岩石的这种显著层理构造,导致其构造变形方面以及强度等物理性质方面表现出各向异性的特点,所以层状岩石的破坏形式以及机制都与其它岩体表现出显著的差异性。除此之外,在隧道工程建设领域经常会遇到大量与层状岩体稳定性等相关的问题,因此,针对层状岩体隧道在开挖过程中的稳定性等问题展开研究已经显得迫切需要。本文在理论研究的基础上,借助于FLAC3D数值模拟软件对不同倾角层状围岩隧道稳定性以及层状围岩中锚杆的支护效果进行研究,研究的成果为层状围岩隧道稳定性分析以及锚杆支护结构的设计提供经验,另一方面也可节约资金,获得良好的经济效益,所以,从理论研究和经济的角度来讲都具有重要的意义。本文主要研究的内容可以分为以下方面:⑴查阅国内外相关文献,对层状岩体的力学特征、本构模型以及破坏准则进行归纳总结,确定文章的研究思路,进而得到层状岩体隧道的破坏机制以及可对稳定性造成影响的主要因素。⑵从隧道混合单元离散法模拟的基本原理出发,借助数值模拟软件FLAC3D建立不同倾角的层状围岩隧道模型,其中包括一个无层面模型以及倾角分别为0°、22.5°、45°、67.5°以及90°共六个模型,并分别对各个模型中围岩的应力、位移、初期支护的受力特点、锚杆的轴力以及塑性区的变化规律进行研究。⑶从经济的角度出发,分别以0°、45°两个模型为例,对锚杆的布置、锚杆的长度两个方面提出了对层状围岩隧道锚杆优化的建议。
[Abstract]:Our country has a vast territory, which brings up the unique characteristics of the geological structure of our country, the most common of which is the rock of layered structure, which accounts for about 77.3% of the land area of our country, and also accounts for about 66.6%. of the land area around the world because of this significant bedding structure of rock, which leads to its structural deformation and strength and so on. The physical properties show the characteristics of anisotropy, so the form and mechanism of the layered rock are obviously different from other rock masses. In addition, many problems related to the stability of layered rock are often encountered in the field of tunnel construction. Therefore, the stability of the layered rock tunnel in the process of excavation is stable. On the basis of theoretical research, this paper studies the stability of different dip layered surrounding rock tunnel and the support effect of anchor bolt in layered surrounding rock with the help of FLAC3D numerical simulation software. The research results are the stability analysis of the layered surrounding rock tunnel and the design of the bolt supporting structure. Providing experience, on the other hand, can save money and obtain good economic benefits, so it is of great significance in both theoretical research and economic perspective. The main contents of this paper can be divided into the following aspects: (1) consulting the relevant literature at home and abroad and summarizing the mechanical characteristics, constitutive models and failure criteria of layered rock mass. To sum up, determine the research ideas of the article, and then get the failure mechanism of the layered rock tunnel and the main factors that can affect the stability. 2. Based on the basic principle of the discrete method simulation of the tunnel mixing element, the numerical simulation software FLAC3D is used to establish the layered surrounding rock tunnel model with different inclination angles, including a non layered model. And the dip angles are 0, 22.5, 45, 67.5 and 90 degrees, respectively. The stress and displacement of the surrounding rock in each model, the stress characteristics of the initial support, the axial force of the anchor and the change law of the plastic zone are studied respectively. 3. From the economic point of view, the arrangement of bolt and the anchor bolt are taken as an example of 0 and 45 degrees, respectively. Length two aspects put forward suggestions for optimization of tunnel bolts in layered surrounding rock.

【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.71

【参考文献】