Study And Application On High Property Grouting Material Used In Synchronous Grouting Of Shield Tunnelling

The construction technology of shild is the main method which build the city underground and submarine tunnel in China.The synchronized grouting is the essential working on constructing shield tunnel. The properties of synchronized grouting materials affect the stratum displacement and the surface subsidence around the tunnel directly. Therefore, study on the high porperty grouting materials will be regarded as a significant meaning.In view of the unevening stratums of Wuhan Yangtze River tunnel which have complex geological condition, we put forward designed idear of high property grouting material which can prevent the rising of ducks, anti- water disperses, water reducing, slow setting properties and so on, throuth adopting the technologies of organic-inorganic compounding, highlyeffective water reducing-slow setting-plastic additive compounding, the textile fiber enhancement and compensate compounding. sis suitable under the multi-purpose high property grouting material was prepared to suit this geological condition.The results of studies indicated that WHT-1, underwater anti-disperse additive and HBP-5, was made of highlyeffective water reducing-slow setting-plastic additive compounding, can develop the grouting material which has the properties of sur-medicinal preparation as well as highlyeffective water reducing-slow setting-plastic additive compounding. High property grouting material which has great properties such as good flowability(19.5cm), without bleeding (bleeding rate: 0.01%),suitble compressive strength(28d compressive strength: 4.56Mpa), great underwater anti-disperse(pH: 7.9, 28d amphibious strength ratio: 90%), preventing duck rising(thickness: 10.4cm,slump constant: 5.3cm), the micro inflation (the 90d freeexpansion rate 4.13×10^-4 ), good anti-erosion performance(soften coefficient: 123%, Ca²⁺ density: 48mgl/L) and so on, by adopting the technologies of organic-inorganic compounding, highlyeffective water reducing-slow setting-plastic additive compounding, the textile fiber enhancement and compensate compounding.Application of the synchronized grouting material using in Wuhan Yangtze River tunnel indicated that material mixture ratio of high properry of grouting material is that cement: fly ash: send: water: HBP-5=1: 4: 12.5: 3.51: 0.013.Grouting pressure: 0.8～1.2Mpa, grout quantity: 7.24m³/L～10.02m³/L, grouting speed: 70L/min～100L/min. The effect is good and actually quenty is 120%; The high performance grouting material cost saves 5～10 Yuan compared to the ordinary synchronized grouting material has the very good economic efficiency and the social efficiency, the application prospect is widespread.