Bottom sealing method for rock foundation pressure-bearing fissure water

Abstract

The invention discloses a bottom sealing method for rock foundation pressure-bearing fissure water. The bottom sealing method for the rock foundation pressure-bearing fissure water comprises the following steps: S1, pervious concrete is laid on a rock foundation to form a pervious concrete layer; the pervious concrete comprises the following raw materials: cement, recycled aggregate, a water reducing agent and a reinforcing agent; the reinforcing agent comprises carboxymethyl cellulose, silicon powder and mortar glue; S2, an anti-seepage geomembrane is laid on the pervious concrete layer obtained in the step S1; and S3, a concrete cushion layer is laid on the anti-seepage geomembrane obtained in the step S2. The materials used in the bottom sealing method are common in construction and do not need to be additionally customized, a simple and convenient construction process, a short construction period, a low cost and a remarkable drainage effect are achieved, and the problem that uplift pressure generated by the rock foundation pressure-bearing fissure water influences a concrete structure can be effectively solved; and meanwhile, the pervious concrete layer is arranged, so that the problem of seepage failure of a sand-gravel layer in a traditional method is avoided, and good quality effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of foundation treatment, and in particular relates to a bottom sealing method for rock foundation pressure-bearing fissure water. Background technique [0002] Confined fissure water is located below the surface and filled between two stable water-resisting layers. The groundwater in bedrock fissures has a certain pressure because it is confined between the two water-resisting layers. And because of the discontinuous distribution of the fissures, each has its own independent system, supply and discharge conditions. Therefore, this kind of water movement is complex and the water volume changes greatly, which brings great difficulties to the construction of deep foundations. [0003] Crack water in the rock foundation will cause seepage damage to the concrete structure, especially the improper handling of the back cover during the construction process will cause quality accidents in the construction of the co...

AI Technical Summary

Problems solved by technology

[0004] At present, there are two common sealing methods for rock foundations with pressure-bearing fissure water: one of which is to use consolidation and curtain grouting to treat rock foundations, and then seal the bottom of low-grade concrete cushions. The commonly used measures of water can completely deal with foundation leakage, but the back sealing method takes a long time and has high cost; another back sealing method is to flatly lay a graded sand and gravel permeable cushion, and then cover the bottom with a low-grade concrete cushion. The construction time of the back-sealing method is short, but the sand and gravel permeable cushion layer of this back-sealing method is prone to seepage damage, resulting in voids in the cushion layer, and the quality cannot be guaranteed

[0005] After searching, it is found that there are few studies on the back sealing method of the rock foundation's pressurized fissure water in the prior art. Therefore, it is urgent to provide a kind of back sealing method of the rock foundation's pressure fissure water, so as to exclude this kind of groundwater and create conditions for foundation construction.

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