高速公路软岩隧道中系统锚杆支护效果研究

发布时间：2018-05-20 19:59

本文选题：软岩围岩 + 系统锚杆　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：锚杆支护技术由于其独特的性能,已经运用到了岩土工程中的各个领域,并取得了良好的效果,尤其是在隧道工程中应用的更为广泛。在隧道施工过程中会经常遇到各种软弱围岩,并且会在软弱围岩中使用系统锚杆,国内外的工程技术人员和学者针对系统锚杆在软岩中的作用进行了大量的试验与研究,目前有两种观点,一种认为应取消系统锚杆,另一种认为应该保留,对于这个问题一直存在争议。本文以张涿高速公路都衙隧道工程为背景,首先在现场勘查的基础上获取了场地碎卵石地层的真实数据,并通过实验得到其物理力学参数。然后利用ABAQUS有限元模拟软件进行三维数值模拟,建立了有系统锚杆和无系统锚杆两种模型,对两个模型中围岩变形、围岩应力以及初期支护的应力进行了对比分析,结果表明两种模型中变形及受力相差很小,云图分布规律无明显差异,得出系统锚杆在这种碎卵石软弱围岩中的作用效果并不明显。为了研究隧道开挖中围岩和支护结构的受力情况,在都衙隧道施工过程中,对该隧道锚杆支护下的围岩变形、围岩应力和支护结构的应力进行了现场监测。通过对围岩变形、围岩应力以及支护结构应力监测数据的分析,进一步说明系统锚杆在都衙隧道工程中的支护效果并不明显,建议在工程中取消系统锚杆。
[Abstract]:Because of its unique performance, anchor bolt supporting technology has been applied to various fields in geotechnical engineering, and has achieved good results, especially in tunnel engineering. In the process of tunnel construction, many weak surrounding rock will often be encountered, and system bolt can be used in soft rock and engineering technology at home and abroad. People and scholars have carried out a large number of experiments and studies on the role of the system bolt in soft rock. There are two points of view at present. One thinks that the system bolt should be cancelled, the other is that it should be retained, and there is always a dispute about this problem. This paper is based on the project of Yamen tunnel of the Zhang Zhuo expressway, and first is based on the field investigation. The real data of the ground pebbles are obtained, and the physical and mechanical parameters are obtained by the experiment. Then the three-dimensional numerical simulation is carried out by the ABAQUS finite element simulation software, and two models with system anchor and non system anchor are established. The deformation of surrounding rock, the stress of surrounding rock and the stress of the initial support are compared and analyzed in the two models. The results show that there is little difference in deformation and force between the two models, and there is no obvious difference in the distribution law of the cloud map. The effect of the system bolt in the soft rock of the broken pebble is not obvious. In order to study the stress situation of the surrounding rock and the supporting structure in the tunnel excavation, the surrounding rock bolt support in the construction process of the Yamen tunnel is carried out. The stress of rock deformation, surrounding rock stress and supporting structure are monitored in the field. Through the analysis of the deformation of surrounding rock, the stress of surrounding rock and the monitoring data of the support structure, it is further indicated that the supporting effect of the system bolt in the Yamen tunnel is not obvious, and it is suggested to cancel the system bolt in the project.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.71

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