Tunnel system anchor rod design method based on safety factor method

Abstract

The invention discloses a tunnel system anchor rod design method based on the safety factor method, and belongs to the field of tunnel engineering. The safety factor of anchor rods and the safety factor of a combined arch structure which is composed of spray layers, the anchors rod and surrounding rocks are confirmed through calculating the surrounding rock pressure of an ejector anchor support system and the surrounding rocks load of the anchor rods, and combining the design function of the ejector anchor support system (being a main body of bearing or supporting temporarily), tunnel characteristics, construction quality, engineering importance and the like. Therefore, the parameter of the anchor rods is calculated, and the parameter design of the systemic anchor rods is finished. The reasonable and effective method of assembly selection and quantitative design of the anchor rods in the ejector anchor support system is provided, and the blindness and randomness of the traditional design method are avoided. The tunnel system anchor rod design method based on safety factor method is simple in step and convenient to implement, and guarantees the safety and stability of the design andconstruction of the tunnel engineering. The accuracy of the anchor rod parameter design in the tunnel ejector anchor support system is greatly increased.

Description

technical field [0001] The invention belongs to the field of tunnel engineering, and in particular relates to a method for designing bolts of a tunnel system based on a safety coefficient method. Background technique [0002] With the continuous development of road traffic and rail traffic in our country, tunnel engineering technology is becoming more and more mature, and various types of tunnels are being used more and more. According to the different construction methods of tunnel engineering, the existing tunnel engineering construction methods usually include open cut method, shield method, mining method, immersed tube method, etc. Among them, the mining method is a relatively traditional and widely used tunnel engineering construction method. method. [0003] For tunnel projects constructed by the mining method, it is generally necessary to set up the initial support of the tunnel after excavation to ensure the stability of the tunnel structure and prevent deformation ...

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Problems solved by technology

[0004] In the prior art, the parameter design of system anchor bolts is usually designed by engineering analogy, which is a commonly used method in the design of tunnel engineering support structures, and is widely used in relevant codes and general drawings, although it can be compared to a certain extent The structural characteristics of the project, but when there is a large difference in the shape or span of the tunnel section, the parameters of the designed support structure will be far from the actual situation, and the reliability of the obtained structural parameters is low, which cannot fully meet the requirements of the tunnel project. application, affecting the safety and stability of tunnel engineering

Although in some existing specifications related to tunnel engineering (such as "TB10108-2002 Technical Specifications for Shotcrete Construction Method of Railway Tunnels", "GB50086-2001 Technical Specifications for Bolt Sprayed Concrete Support", "JTG / D70-2010 Design Rules for Highway Tunnels ") and manuals (such as "Technical Manual for Railway Engineering Tunnel Design") put forward some regulations and structural requirements on the setting of anchor bolts, but did not propose a specific method for determining the parameters of the anchor bolts in the system, and often only gave a larger The selection range of the support structure increases the subjectivity when determining the parameters of the support structure, and the accuracy of the relevant parameters cannot be fully guaranteed, which greatly affects the safety and stability of the tunnel project.

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