A construction method for grouting and water-stopping of bare rock in underground caverns

Abstract

The invention relates to a construction method adopting grouting to stop water in bare rock of an underground cavern and belongs to the technical field of civil construction. The construction method comprises six steps of determining a grouting range for a water seepage area of the underground cavern; determining parameters of grouting holes in the grouting range of the underground cavern; pre-burying a water seepage drainage pipe and a return pipe; spraying concrete in the grouting range; performing grouting in the grouting range with a method; ending grouting according to a standard. According to the construction method adopting grouting to stop water in the bare rock of the underground cavern, construction of the grouting holes and pre-burying of the drainage pipe before spraying of the concrete are sufficiently used, slide waste of the sprayed concrete material is reduced, combination of the sprayed concrete material with rock surface is increased, grouting is performed after concrete spraying according to the grouting ideas of grouting outer-ring holes firstly and then grouting inner-ring holes, grouting seepage-free holes firstly, then grouting small-seepage holes and finally grouting large-seepage holes, water seepage in the cavern is prevented effectively, repeated grouting to stop water is avoided, time is saved, and the construction progress is accelerated.

Description

technical field [0001] The invention belongs to the technical field of civil construction, and in particular relates to a construction method for grouting and water-stopping of bare rock in underground caverns. Background technique [0002] In the construction of underground engineering, the excavation of underground caverns generally requires a bolt-spray support. During a bolt-spray support period, water seepage in the surrounding rocks of the caverns is often encountered, especially in water-rich areas, where water seepage in the surrounding rocks of underground caverns seriously affects The quality of anchor shotcrete support restricts the construction progress of caverns, and at the same time increases the safety risk of underground cavern construction. At present, in domestic underground cavern surrounding rock bare rock sections, systemic consolidation grouting is often used after the completion of bolt-spray support, or consolidation grouting after secondary concrete...

AI Technical Summary

Problems solved by technology

[0002] In the construction of underground engineering, the excavation of underground caverns generally requires a shotcrete support. During the period of anchor shotcrete support, water seepage in the surrounding rocks of the caverns is often encountered, especially in water-rich areas, where water seepage in the surrounding rocks of underground caverns seriously affects The quality of anchor shotcrete support restricts the progress of cavern construction and increases the safety risk of underground cavern construction

At present, in domestic underground cavern surrounding rock bare rock sections, systemic consolidation grouting is often used after the completion of bolt and shotcrete support, or consolidation grouting after secondary concrete lining construction in seepage sections. Consolidation grouting is for the purpose of consolidating the surrounding rock. After the consolidation grouting construction is completed, although it can reduce the water seepage of the cavern, it cannot achieve the purpose of preventing the water seepage of the underground cavern, especially it is more difficult to grout and stop water in the bare rock of the cavern

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