A Pre-grouting Reinforcement Process for Subway Tunnel Surrounding Rock Ground

Abstract

The invention discloses a ground pre-grouting reinforcing process for subway tunnel surrounding rock. The ground pre-grouting reinforcing process comprises the following steps that (1) the subway tunnel surrounding rock range needing to be reinforced is determined as a target rock body area; (2) an oblique hole making section is constructed, specifically, oblique drilling holes are constructed close to the target rock body area from far to near, gradually become horizontal drilling holes in a transition mode and are internally provided with sleeves; (3) a horizontal grouting section is constructed, specifically, the horizontal holes are constructed, and a horizontal drilling section is determined according to the length of the pre-grouting reinforced surrounding rock; (4) grouting reinforcing is conducted, specifically, grout is conveyed into a target rock body through a drilling rod; and (5) after grouting of all the horizontal drilling holes is completed, the sleeves in the oblique drilling holes are pulled out, and then hole sealing is conducted. By adoption of the ground pre-grouting reinforcing process for the subway tunnel surrounding rock, the subway tunnel surrounding rock can be effectively reinforced, the phenomena such as surrounding rock collapse or roof fall after subway tunnel excavation are prevented, subway construction efficiency is improved, and the supporting effect of the subway tunnel surrounding rock is improved.

Description

technical field [0001] The invention relates to a construction technique for ground pre-grouting reinforcement of the surrounding rock of a shallow buried tunnel, which is suitable for underground tunnels of municipal projects such as subways and underground pipe galleries, and can improve the stability of broken rock masses and the engineering geological environment for tunnel construction. Background technique [0002] The continuous expansion of the city scale and the continuous growth of the population have caused serious urban traffic congestion, which will inevitably require people to increase the use of underground space. The subway has become an effective means to relieve traffic pressure and speed up the pace of the city. At present, major cities in my country are constantly increasing their efforts in subway construction, and subway construction will be the focus of urban underground space development in the 21st century. More than 20 cities across the country are ...

AI Technical Summary

Problems solved by technology

However, after excavation, the rock mass on the top of the cavern will often have a large settlement, and the broken rock mass may even collapse and collapse. Especially, the rock mass around the shallow-buried strongly weathered underground tunnel is generally in a dense joint and very broken state. state, resulting in low subway construction efficiency and weakened surrounding rock support effect

Images