Study On Test And Application Of The Watertight And Reinforcing Grout In Coal And Rock Mass

Grouting is widely applied to reinforce roadways, plugging water of roof in nime, preventing leakage and reinforcing surrounding rock of dam foundation, rising and correcting building and so on, which has a wide use and good result. At the same time, grouting technology is greatly developed by multifarious new grouting materials, new technology and new equipment. Study on grouting material and behavior of grout plays a significant role in the technology of grouting.Base on collecting the past data, indoor test and theoretic analysis and appliance in the scene of projection, test and application of the watertight and reinforcing grout in the coal and rock mass has been preliminary studied inhere. Some results are discussed as followeds:1. In this paper, development and some quesons of grouting, including grouting material, grouting technology and classification of grouting, have been discussed. Basic theories associated with permeability of grouting are analyzed and summarized in detail.2. Through the past data and the laboratory, it confirms preliminarily that the watertight and reinforcing grout in the coal and rock mass is made up with cement, fly ash, clay, quicklime, sodium sulfate, water, etc. The proportioning has a general best range through the orthogonal test, however, when applying it in the specified projection, the grout should be according to the practical case at spot as well as the practical experiment, so as to ensure the best formulation. The property of grout test has manifested that the grout has excellent conditions, the stone body of the grout has showed good effect and permanence, and the property of the grout relates to the content of the components of it. The broken coal solidifying experiment shows that the strength of the solidity is improved effectively after solidification.3. The paper analyses the reaction mechanism of the grout. Grouting how to water shut-off and reinforce the rock mass has been discussed, the affecting factors of the grouting effect has been concluded and summarized.4. Through case studies, the applied research of projection has manifested that the combined method of small flowing, low voltage, batch-type, full-face curtain permention pre-grouting and reinforceing grouting in short holes in coal and rock mass to control water inrush problems is effective. The grouting result is well.