Layered and sequential grouting reinforcement treatment method for sunk vault of urban tunnel

Abstract

The invention discloses a layered and sequential grouting reinforcement treatment method for the sunk vault of an urban tunnel. Through gaps between various pipelines under the ground, drilling is carried out on the ground in the range of a sunk area of the tunnel; through the drilling depths and the grouting-stop depths in holes in different positions, grouting is carried out in surrounding rockbelow the grouting-stop depths, specifically, the surrounding rock from the vault of the tunnel to the ground is divided into a shallow slurry-blocking layer, an intermediate reinforcement layer, a vault reinforcement layer and a vault grouting-stop layer, and grouting is carried out layer by layer in the sequence of the shallow slurry-blocking layer, the vault grouting-stop layer, the vault reinforcement layer and the intermediate reinforcement layer under different controllable slurry initial setting time and final grouting pressure, and overall system reinforcement of the upper formation ofthe tunnel is achieved.

Description

technical field [0001] The invention relates to a layered and sequenced grouting reinforcement treatment method after subsidence of an urban tunnel vault and road surface, and belongs to the field of grouting reinforcement of urban tunnel surrounding rock, urban tunnel vault subsidence, or grouting reinforcement treatment after subsidence of the road surface above the tunnel. technical background [0002] During the construction of urban tunnels, when encountering loose layers, water-containing loose and broken layers, or miscellaneous filling layers, the disturbance after tunnel excavation and during construction will destroy the stability of the surrounding rock on the tunnel, and the redistribution of stratum stress Under the environment, the surrounding rock of the tunnel vault will be deformed, the vault will settle, and even the settlement of the tunnel vault will exceed the limit, causing a collapse accident; ) leakage and groundwater will continue to erode these form...

AI Technical Summary

Problems solved by technology

[0004] However, when drilling and grouting the unstable surrounding rock of the tunnel vault by using ground drilling, there is a safety risk that drilling disturbance and grouting pressure may also aggravate the instability of the surrounding rock of the vault, and the grouting pressure acts on the vault. On the surrounding rock, it will be superimposed on the self-weight pressure of the surrounding rock, aggravating the risk of tunnel collapse; the grouting slurry will leak to the surface and into the tunnel respectively in the unstable surrounding rock with extremely loose gaps and cracks, and the grout will appear. Emerging from the surface, leaking through cracks in tunnel arches

It will even spread along the pipeline gap under the road surface, seal the corresponding pipeline, affect the normal operation of the pipeline, and cause other accidents

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