Tunnel surrounding rock advanced horizontal water stop grouting construction method

Abstract

The invention discloses a tunnel surrounding rock advanced horizontal water stop grouting construction method. The tunnel surrounding rock advanced horizontal water stop grouting construction method comprises the following specific steps that grouting holes are formed in the whole section and grouting is conducted, specifically, the grouting holes are formed in all soil bodies of an excavation area, an arch crown area around a tunnel, areas on two sides and an inverted arch area and grouting is conducted; in the process of forming the grouting holes, if water overflows from the grouting holes,drilling is stopped immediately, grouting operation is implemented, and after grouting is completed, the grouting holes are reformed at the original positions; if a new water overflowing situation occurs in the process of reforming the grouting holes, drilling is stopped again, grouting is conducted again, and the process is repeated until the depths of the grouting holes formed in the positionsmeet the design requirements and grouting operation is completed; and in the grouting process in each grouting hole, double-liquid slurry and single-liquid slurry are repeatedly and alternately grouted. According to the tunnel surrounding rock advanced horizontal water stop grouting construction method, hole distribution and grouting are conducted on the whole section, the optimized grouting procedure and sequence are matched, thus rock mass around the tunnel is comprehensively and fully reinforced, the full water stop effect is achieved, and surrounding rock stability in the tunnel excavationprocess is guaranteed.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an advanced horizontal water-stop grouting construction method for surrounding rock of a tunnel. Background technique [0002] During the excavation process of mining tunnels, the weak or water-rich surrounding rocks are often reinforced and water-stopped by horizontal grouting in advance. Due to the shortcomings of some key construction technologies, the reinforcement effect is often unsatisfactory, and the surrounding rocks collapse or water inrush occurs after excavation. . At present, the grouting reinforcement does not consider the condition of advanced grouting. The groundwater in the front of the face is static, and the water pressure decreases from bottom to top. During grouting, the grout generally spreads upwards in the seepage channels such as cracks. There are defects in key technologies such as grouting hole layout, grouting procedure, and sequence, whic...

AI Technical Summary

Problems solved by technology

[0003]① There are too few horizontal holes, and there are reinforcement blind spots around the tunnel

In this way, the holes are arranged directly in front of the face of the tunnel, that is, most of the excavation range is a blind area for reinforcement. ) diffusion, and very little diffusion outside the excavation range, so the surrounding rock reinforcement on both sides of the tunnel and the inverted arch is often insufficient, and the water-stop curtain cannot actually be realized

[0004]②Drill the hole to the design position at one time, sometimes the same grouting hole is connected to more than one seepage channel, these seepage channels are grouted at the same time, the grouting effect cannot be the same , some seepage channels often have insufficient grouting, and the reinforcement effect is very poor

[0005]③The grouting grout is mostly single-fluid grout, the amount of grout is large, and the grout spreads far away, and there is very little around the tunnel, which cannot completely fill the seepage channel around the tunnel

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