Injecting paste material for plugging water in tunnel of high-pressure karst area rich in water and preparation method of injecting paste material

Abstract

The invention discloses an injecting paste material for plugging water in a tunnel of a high-pressure karst area rich in water and a preparation method of the injecting paste material. The injecting paste material comprises components in parts by weight as follows: 15-25 parts of coal ash, 5-12 parts of a water reducing accelerator, 100 parts of Portland cement and 60-100 parts of water. The preparation method of the injecting paste material comprises the steps as follows: 1), the coal ash and the Portland cement are mixed and fully stirred, a Portland cement-coal ash mixture is obtained; 2), the Portland cement-coal ash mixture is added into water and fully stirred, and a water solution of the Portland cement-coal ash mixture is obtained; and 3), the water reducing accelerator is added into the water solution of the Portland cement-coal ash mixture and fully stirred, so that the injecting paste material for plugging water in the tunnel of the high-pressure karst area rich in water is obtained. According to the injecting paste material and the preparation method, the coagulation time of the injecting paste material is controllable, the dispersion resistance is good, the strength is high, the durability and the stability are good, and the preparation method is simple, easy to implement and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a grouting material used in tunnel water blocking construction in a high-pressure water-rich karst area and a preparation method thereof. Background technique [0002] In recent years, with the development of my country's economy, tunnels and underground projects have also developed rapidly. In order to solve traffic and energy problems, underground projects such as road tunnels, railway tunnels, subway interval tunnels, underground excavation stations, diversion tunnels and underground powerhouses are being constructed on a large scale. During the construction and use of tunnels and underground projects, they are always endangered by groundwater. In high-pressure water-rich karst areas, water gushing is the most important geological disaster faced in tunnel construction. On the one hand, water gushing during tunnel construction not only reduces the stabi...

AI Technical Summary

Problems solved by technology

On the one hand, water gushing during tunnel construction not only reduces the stability of the surrounding rock, but also brings many adverse effects to the construction, especially in the case of a large amount of high-pressure water gushing, which often leads to major accidents

On the other hand, in order to solve the problem of groundwater disasters, excessive discharge will bring ecological and environmental problems to the tunnel passing through.

[0003] At present, the principle of "combining prevention, drainage, blocking and interception, adapting measures to local conditions, and comprehensive treatment" is mainly adopted for tunnel water gushing. The grouting materials used for water blocking construction are mainly divided into two categories: inorganic materials and organic materials. Materials include cement slurry, clay cement slurry, cement-sodium silicate slurry and silicate slurry, etc. The main defects of these materials are large water demand, poor pourability, poor water stability and high rigidity of the solidified body; organic type Materials include polyurethane slurries, urea-formaldehyde resin slurries, acrylamide and lignin slurries, etc. The main defects of these materials are that they are toxic, pollute the environment, and are expensive, so they are rarely used