A tunnel inclined shaft construction method with grade Ⅳ surrounding rock and soil quality

Abstract

The invention provides a tunnel inclined shaft construction method with grade V surrounding rock and soil quality, which includes: excavating a water intercepting gutter at the entrance of the inclined shaft, protecting the slope of the inclined shaft, excavating the body of the inclined shaft; excavating the body of the inclined shaft The process is as follows: construction of the arch wall at the entrance; excavation of the entrance section. In order to ensure the construction safety and the quality of the arch wall, the opening section is excavated with a deformation of 10-15cm. , the cycle footage is controlled within a certain arch frame spacing, and the principle of "short footage" is followed for the reinforced molded lining section of the V-level surrounding rock. When stonework is encountered during the excavation process, the weakening and loosening blasting is used for excavation and the blastholes are strictly controlled. Depth and dosage: After excavation, find the roof and first spray the bottom concrete, then apply anchor bolts, advance small conduit support and erect steel frames, and finally spray concrete to the design thickness. The invention can effectively avoid the impact on the quality of the hole caused by the loose or cracked soil falling down greatly after excavation.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for constructing an inclined shaft of a tunnel with Class V surrounding rock and soil quality. Background technique [0002] The structure of the tunnel includes two parts, the main building and the auxiliary equipment. The main building is composed of the tunnel body and the tunnel door, and the auxiliary equipment includes car avoidance tunnels, fire-fighting facilities, emergency communication and waterproof and drainage facilities, and the long tunnel also has special ventilation and lighting equipment. With the improvement of the level of construction engineering and the requirements of economic development, more and more tunnels need to be excavated in mountainous areas due to the advantages of tunnels crossing mountains, providing vehicles for driving and reducing driving distances. Tunnel entry in mountainous hills has always been the link with the m...

AI Technical Summary

Problems solved by technology

However, there is currently no tunnel construction method for grade V surrounding rock and soil in the market, and grade V surrounding rock and soil have the following characteristics: hard rock and relatively hard rock, broken rock mass, poor joint surface, soft rock: well-developed structural plane , Fragmented structure or loose structure, average or poor bonding, very soft rock (Rb=0-5Mpa), structural planes are not developed or structural planes are relatively developed, but the bonding surface is good

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