Advanced reinforcing construction method for building tunnel in soft surrounding rock

Abstract

An advanced reinforcing construction method for building a tunnel in soft surrounding rock includes the specific steps that first, surveying and lining are performed on the arch top of the tunnel, and piles are positioned; second, through horizontal rotary spraying technology, horizontal rotary spraying pile construction is performed on the arch top of the tunnel; third, a water stopping plug is reinforced on a tunnel face through double-liquid slip casting construction, wherein slurry for double-liquid slip casting is composed of a phosphoric acid solution and a sodium silicate solution. According to the method, horizontal rotary spraying reinforcement is first performed on the arch top of the tunnel and a high-strength reinforced body is formed; double-liquid slip casting construction is performed on the tunnel face for reinforcement, a large-range low-strength reinforced body is formed, the defects of horizontal rotary spraying reinforcement on the arch part are compensated for, a phosphoric acid and sodium silicate slip casting method and a horizontal rotary spraying slip casting method are combined for use so that advantages can be given play to and disadvantages can be avoided, the process is simple, construction efficiency is high, the construction period is shortened, and the method is economical and safe and facilitates project implementation. The method can be widely applied to advanced reinforcing construction for building the tunnel in the soft surrounding rock.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a construction method for advance reinforcement of tunnels. Background technique [0002] In the construction of tunnels in saturated silty sand layers or similar formations with low permeability, the effect of ordinary grouting methods is very poor. For example, in the Xingwangmao Tunnel of the Taizhongyin Railway, the Shangbai Tunnel of the Daxi Railway, the Taoshuping Tunnel of the Lanzhou-Chongqing Railway, the Liangshan Tunnel of the Xiamen-Shenzhen Railway, and the Dongguan-Huizhou Intercity, there are ordinary single-liquid grouting or cement water The problem of poor injectability of glass two-liquid grouting. This kind of stratum is dense without cementation, has no self-stabilization ability, and is easy to collapse during excavation. In this kind of stratum, ordinary slurry cannot spread effectively and evenly, even if high pressure is used sometimes, when the inje...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an advanced reinforcement construction method for the construction of weak surrounding rock tunnels, to solve technical problems such as water inrush and sand inrush, unstable soil on the tunnel face, and easy collapse during the advanced reinforcement construction of weak surrounding rock tunnels.

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