Fracture rock no-slurry-blocking wall compound grouting construction method

Abstract

The invention discloses a fracture rock no-slurry-blocking wall compound grouting construction method. The method comprises the following steps: when carrying out grounting, firstly, pressing and injecting pure water cement slurry in an inner hole, closing water glass slurry inlet gate valve, opening the water glass slurry inlet gate valve after the heading face leaks cement slurry and simultaneously pressing and injecting double liquid slurry of cement and water glass; after the heading face does not leak the slurry or the heading face leaks double liquid slurry which is solidified and basically blocks fracturing crack, firstly stopping water-injecting glass, then stopping water-injecting slurry, and opening a pressure-relief gate valve in time. The fracture rock no-slurry-blocking wall compound grouting construction method has the beneficial effects that by normal grouting hole channels and pipelines, the double liquid slurry is pressed to carrying out consolidation to rock bodies near the heading face, simultaneously the double liquid slurry does not block the normal grouting hole channels either, thus achieving the purposes of consolidating the rock bodies near the heading face, then normally grouting single liquid slurry and forming water curtain.

Description

technical field [0001] The invention relates to a tunnel engineering construction method, in particular to a tunnel engineering grouting construction method. Background technique [0002] In subsea tunnels, river-crossing tunnels, and underground engineering construction under special geological conditions, groundwater is a major problem that plagues engineers. If groundwater cannot be effectively prevented, it will cause shutdowns or catastrophic consequences for engineering construction. In order to effectively avoid this risk, the commonly used method at present is to build a grout-stop wall (some projects use shotcrete grout-stop walls when the rock slab on the face of the face is better) before grouting. If the surrounding rock is relatively broken, build a grout-stop wall Mortar walls will be a must. [0003] The construction of the grout-stop wall not only causes a lot of time loss (need to install formwork, pour concrete and concrete curing), but also causes a lot o...

AI Technical Summary

Problems solved by technology

[0003] The construction of the grout-stop wall not only causes a lot of time loss (need to install formwork, pour concrete and concrete curing), but also causes a lot of waste of concrete. However, the waste of a large amount of concrete is still unavoidable. At the same time, the grout pressure is too high during the grouting process, which may cause the shotcrete to crack, thus losing the grouting effect.

[0004] Moreover, for the broken rock near the structural zone, the joints are dense, the rock is in the shape of gravel and breccia, and some fracture zones are in the form of breccia or scattered soil and stone, and the water permeability is moderate to strong. In order to prevent water inrush accidents During the construction process, advanced curtain grouting must be carried out on the water-rich tunnel sections that have been exposed by drilling. According to construction experience, the period of advanced curtain grouting is long, especially when the surrounding rock is broken and there is no good magmatism. In some cases, it is necessary to trim the grout stop wall to meet the good grouting effect, which makes the original long construction period worse