High pressure abrasive water jet tunneling method

Abstract

The invention discloses a high-pressure abrasive water jet tunnel excavation method, which includes the following steps: S1, confirming the construction parameters, using a high-pressure abrasive water jet device to perform trial cutting on a certain part of the tunnel face, and obtaining slot depths under different processing parameters and the slot width, and then select a set of parameters according to the construction site conditions for construction; S2, divide the tunnel surface grid, and divide the tunnel surface grid according to the construction parameters obtained in S1; S3, cut the slot, and use high-pressure abrasive water jet The abrasive water jet sprayed by the axial nozzle of the device moves along the cutting line of the face grid to form slots, which divide the face into multiple rock blocks; S4, peeling off rock blocks, uses a high-pressure water jet device The abrasive water jet sprayed by the radial nozzle in the slot radially cuts the bottom of the slot, so that the rock blocks are peeled off, and the peeled rock blocks are transported away from the face. It can be applied to rock mass excavation under various complex geological conditions, improve excavation efficiency and accuracy, and reduce environmental pollution.

Description

technical field [0001] The invention relates to tunnels and underground engineering, in particular to a high-pressure abrasive water jet tunnel excavation method. Background technique [0002] Underground space is an important part of land resources and the main distribution area of ​​energy storage. Tunnels, subways, civil air defense projects and underground roadways all require a large amount of rock and soil excavation and excavation. The annual excavation volume is about 20,000 kilometers, and it shows an increasing trend. At the same time, my country has a vast territory and the distribution of geological structures is extremely complex. The commonly used drilling and blasting method and shield tunneling system play a key supporting role, but they still cannot meet the comprehensive requirements of the complex geological environment. The drilling and blasting method has problems such as over-excavation, under-excavation, difficulty in precise control, instability of s...

AI Technical Summary

Problems solved by technology

[0003] CN104314573A discloses a hard rock tunnel construction method based on hydraulic cutting, which uses a hydraulic cutting machine to cut the surrounding rock in the cutting contour line into a plurality of rectangular cutting blocks, and uses the hydraulic splitting machine to cut seams and / or The vertical cutting seam is split, and multiple rectangular cutting blocks are split from the excavation section of the current construction cutting section, which improves the excavation control accuracy compared with the traditional drill and blast method or shield tunneling method , the environmental pollution is less, but due to the limited cutting capacity of hydraulic cutting, the excavation efficiency is low

Although hydraulic cutting machines have been used alone to realize the excavation construction of mine roadways, there are still the following disadvantages: 1) Utilize high-speed moving water to cut the excavation surface, limited by hydraulic cutting equipment, the excavation depth is limited, and in order to ensure deeper cutting, It is necessary to move the hydraulic cutting machine head slowly, which affects the excavation efficiency; 2) The construction process is to cut the outer contour line first, and then cut the rock blocks in the contour line obliquely. Since the cutting depth is 1.5 to 2 meters, the incident angle between the oblique cutting jet and the excavation surface is inclined at an angle of 25 to 45°. Accordingly, the vertical height of the excavation surface should not be too large, otherwise it will cause some rock blocks on the excavation surface. It cannot be cut off, which also affects the tunneling efficiency

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