High Water-cement Ratio Of New Type Consolidation Grouting Material To Geological Disasters Prevention Research

Currently, grouting method have unfavorable factors that affected the effects of grouting, the factors such as long time of condense time, limitation of its adjustability. To eliminate the adverse effects of the unfavorable factors, strive to find a new type of consolidation grouting material, that have the condensation features at the case of high water-cement ratio, adjustable performance, calculus could meet the requirements of special projects, rich sources of its raw materials and economy. The material could also be used in the other construction field.Grouting method is to inject the appropriate grouting material into the object, to achieve the purpose of filling cracks, rock and soil reinforcement, plugging of water leakage, preventing leakage, and correcting the skewed buildings. Grouting techniques are widely used in drilling fluid leakage in geological drilling, plugging water leaks in mine, filling and reinforcing empty tunnel and after of the wall, dam curtain grouting, filling underground caves, reinforcing foundation and road base, consolidating and reinforcing shotcrete of slop and other construction fields.Firstly, according to geological disasters'requirements to the performance of grouting material, proposed the characteristics and key controlled indicators that the consolidation grouting materials of high water should have.that is, consolidate at the case of high water-cement ratio, have high mobility, the time of condense should be adjustable, high-strength characteristics under the conditions of high water-cement ratio, and environment-friendly. Related literature study in the domestic and abroad shows that to achieve the above performance easy to adjust and the overall performance easy to control of the grouting material, generally used by the A and B grouting material. In practice, by changing the ratio of A and B grouting material to control the overall performance.Base material of grouting material is the most important factor to determine the properties of grouting material, according to the research target above-mentioned of the study, In this study, inorganic cementitious material is selected as a base material of consolidation grouting of high water-cement ratio. Base material that used to be grouting material usually consists of silicon- calcium, silicon- aluminum and sulfur-aluminum three type of components. At the base of comprehensive analysis the performance's advantages and disadvantages of various base materials, selected the type of sulfur-aluminum as the base material of the series experiment, as the pure aluminum-based grouting material can not meet the basic requirements of the grouting material properties of the basic performance under the conditions of high water-cement ratio, it must be improve its performance. Modified the properties of aluminum-based material by mixed with different types of gypsum and lime in the experiment, formed the A grouting material of a type of sulfur-aluminum base material, that mixed with lime powder and anhydrite powder of consolidation grouting materials of high water-cement ratio.To improve the performance of A grouting material, meet the requirement of different engineering environments and different conditions to the properties of grouting material, required a wide range adjustment on the condense time and flow properties, this is a further requirement to application of consolidation grouting materials of high water-cement ratio, by many times experiment study, selected boric acid to adjust the condense time, polycarboxylate to improve its flow properties, boric acid and polycarboxylic constitute the B grouting material of consolidation grouting material of high water-cement ratio.To study the A and B grouting material'-scomprehensive performance when they are used together with each other, using multi-factor analysis of orthogonal test. First, by single factor test, on the basis of fixed base material, determined the level of admixture material that is lime powder and gypsum powder, and boric acid and polycarboxylic. By using four factors and three level orthogonal test table, complete the orthogonal. According to the results, analysis the affect of all the various factors to the consolidation grouting material of high water-cement ratio. Respectively get the optimal level of group that affect each performances of the grouting material, and get the optimized formulation of orthogonal. Finally, by the single factor analysis, make proper adjustments to the orthogonal test according to the performance in the requirements of practical application, gained two types of grouting material that is rapid condense time and adjustable condense time, In order to choose corresponding in the practical application.The paper also according to the performance requirements of grouting material, systematic testes and studies the main performance of consolidation grouting materials of high water-cement ratio. The test results show that:the material has good consolidation properties at the case of high water-cement ratio, the availability of good irrigation, performance of adjustable condense time, satisfied the strength requirements at the case of high water-cement ratio, stable performance of the condensation of the block and high percentage of formed stone body. In addition, the grouting material also have the characteristics of a wide source of raw materials, lower price, non-pollution to the environment.The new type consolidation grouting materials of high water-cement ratio get the initial application in geological drilling plugging leakage test in the ground geological investigation of the peace number one drilling of Chengdu-Lanzhou railway at Yejiping Shidaguan towns, Maoxian county, Sichuan province. Twice tests of consolidation grouting, by adjusting the additives, improved the characteristics of condense of grouting material, effectively solved the technique problem of abnormal condense time of lower temperature conditions at high altitude, and solved the technique problem of the condense time particularly long, obtained a satisfactory effect of plugging leakage in the consolidation grouting.