Multi-tunnel construction method based on weak interlayer

Abstract

Disclosed is a multi-tunnel construction method based on weak interlayers, the method comprising the following steps: measuring the position of weak interlayers, uniformly distributing conduits in the weak interlayers, grouting the weak interlayers via the conduits to form a grouting area, A number of tunnels to be constructed are evenly distributed on both sides of the weak interlayer, and the geotechnical parameters of the tunnels are measured. Blast holes are evenly distributed in the core area, and blast holes and energy-absorbing holes are arranged in the buffer zone. The holes are surrounded by the energy-absorbing holes, and the non-adjacent tunnels continue to be continuously blasted in a predetermined order until all the tunnels are blasted. slurry, reduce the number of blast holes and / or reduce the amount of explosives in the blast holes, non-adjacent tunnels are blasted continuously in a predetermined order and make the displacement change of surrounding rock and / or the change of surface settlement less than the predetermined threshold.

Description

technical field [0001] The invention relates to the technical field of precise blasting and excavation of tunnels, in particular to a multi-tunnel construction method based on weak interlayers. Background technique [0002] Natural rock mass is not homogeneous, which contains a large number of joints and weak interlayers. Weak interlayer is one of the major engineering geological problems often encountered in geotechnical engineering, and it is also an object that needs to be studied emphatically in engineering. Weak interlayer generally refers to a thin layer with fine particles, sheet-like structure, easy to soften or muddy when exposed to water, low mechanical strength, and relatively weaker than the upper and lower rock layers. According to its origin, it can be divided into three types: structural, primary, and secondary. Type, where the muddy part is called the muddy interlayer. Weak interlayers are widely distributed, involving almost all regions and various rock fo...

AI Technical Summary

Problems solved by technology

There are weak interlayers in the rock mass, and the weak interlayers make the constitutive relationship of the material more complicated. Even if the engineering rock mass is regarded as an elastic medium to establish a wave equation about the propagation of stress waves, the complex boundary conditions and initial conditions also make the equation hard to get exact solution

Therefore, some scholars have used numerical simulation to study the influence of the properties of weak interlayers on the intensity of stress waves, but there is still a lack of analysis on the mechanism of energy dissipation, and a lack of in-depth research on the explosion source model in numerical simulation.

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