Partitioned phased grouting reinforcement method, construction method and application

Abstract

The invention discloses a partitioned phased grouting reinforcement method, a construction method and an application. According to the reinforcement method, holes are formed in a working surface, orifice pipes with corresponding depths are tripped into the holes according to the depths of the holes, and a first reinforcement area is grouted by a short orifice pipe; a second reinforcement area is grouted by a long orifice pipe, another step is taken and so on, the first reinforcement area to the n reinforcement area are respectively grouted, and n is larger than or equal to 2; the orifice pipes with different lengths are distributed at intervals in surrounding rocks reinforced by grouting, and phased grouting reinforcement for loose surrounding rocks is realized by the aid of rapid hardening slurry. During deep grouting, owing to the isolation function of the long orifice pipe for shallow surrounding rocks, the slurry can be directly conveyed to the deep surrounding rocks, and the reinforcement method solves the technical problems that slurry can directly enter shallow grouted and reinforced areas without the long orifice pipe in the past, the shallow grouted areas are repeatedly grouted, and accordingly, grouting reinforcement effects of the deep surrounding rocks are weakened.

Description

technical field [0001] The invention relates to the field of grouting reinforcement, in particular to a separated segmental grouting reinforcement method, construction method and application. Background technique [0002] In the construction of underground engineering, due to the influence of unfavorable geological conditions such as loose and broken strata or even rich water, natural geological disasters such as collapse, water gushing and mud gushing often occur. Grouting reinforcement is one of the most effective methods to control such geological disasters. The purpose of grouting reinforcement is to fill the grout into the void of surrounding rock through grouting, and form a consolidated body with a certain strength after the grout is consolidated, and isolate the groundwater from the grouted reinforcement body. In this way, the overall strength and self-stabilization ability of the loose surrounding rock can be improved, and conditions can be created for safe excavat...

AI Technical Summary

Problems solved by technology

If the grouting section is longer, if the grouting section is divided into several sections in the longer grouting section, the phenomenon of repeated grouting will also appear in the grouted section, so that the shallow surrounding rock is repeatedly grouted and reinforced, while the deep part The surrounding rock is not effectively reinforced, so that the effect of grouting in the deep surrounding rock is poor

Possess safety risks for deep excavations

[0004] In addition, when grouting reinforcement in loose water-rich surrounding rock, if single-liquid cement slurry is used, the grout will split the loose surrounding rock under a certain pressure and form new cracks, which also causes damage to the reinforced shallow part. The cause of repeated grouting in loose surrounding rock, so the lack of selection of suitable grouting grout is also a major shortcoming of the existing technology

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