A Toe Board Foundation Treatment Of The High Concrete-Faced Rockfill Dam In SHUIBUYA

Concrete-faced rockfill dam is high of 233m in SHUIBUYA. It is the highest dam of the world in similar dam model at present.Toe Board is the kneading board in coupling structure between faceplate and groundsill. and simultaneously also is the connection body for guarding against infiltrates into curtain, it is most essential spot which the kneading board dam links the preceding with the following.This article has carried on the classification to the construction crag body of Toe Board: Direct use on crag body, processing use on crag body, excavating and elimination on crag body, simultaneously proposed excavating on Toe Board Foundation in macro judgment standard and fix quantity inspection Index. For own anti- flushes of eclipse ability request and defend against infiltrates to the curtain grouting, it need to enhance the pressure.Toe Board foundation to be excavated in depth suitably to weak discharge (or weak airslake) on crag body, Velocity value of sound wave is not smaller than 3000m/s. If other conditions limits, it could not excavated to Lower part of rock layer in the weak airslake, We suggest to take the structure measure to carry on processing, to build anchor rod and to solidified the grouting, to enhance construct bedrock quality of Toe Board..Inclination angle is gentle in the foundation crag body of Toe Board, The geological flaw type is diverse, Teo Board on grouting is small, peak of movement flood is high from the reservoir. Anaphase does not have conditions for patches fills.In view of foundation treatment difficulty and characteristic , we have res-earched and used method of "evenly solidifies + the curtain" to make holes.To be solidified the grouting contact section , most tremendous pressure to achieve 0.5Mpa, Effectively enhanced grouting pressure on the foundation shallow layer of Toe Board, to be satisfied the request SHUIBUYA high kneading boa-rd dam in the long-term with high flood peak movement.Through several methods, drilling hole to take core before fill and after fill.Physical prospecting test, sound wave test, heavy-caliber hole inspection and so on, we have carried on the comparative analysis for crag body quality index. Achievement of presses the water test, Sound wave velocity value. We have consider that Solidifies in the grouting has a bigger improvement for the quality of the foundation crag body in Toe Board First: The crag body qualitative index has the certain enhancement after fill. Growth has be enhanced the scope in a big way in the shallow layer crevasse relatively broken crag body, each section of rock layers achieve "was good" the kind of crag body after filled.Second:Water permeability reduces greatly in the crag body, the water permeable changes uniformity collectivities, may satisfy to the design to the request which guards against infiltrates.Third: sound wave value has the certain enhancement reflected crag body complete Index, it enhances the scope to be bigger to the shallow complete worse crag body.It may enhance about 10% roughly.Regarding Toe Board foundation of the high faceplate board Moraine dam, The result of research is that: solidifies the function which was in the grouting not only to enhanced the bedrock integrity and the uniformity, more importantly strengthenedToe Board foundation shallow to guard against infiltrates the curtain body thickness and compactness, reduced infiltrates waterpower , and for enhanced the curtain grouting pressure to revere decides the foundation.At the same time, this article has be carried on the system narration, to the present world highest concrete kneading board dam in foundation geology condition, in the project crag body characteristic, in the crag physique quantity graduation and in the engineering geology condition, content in this article is full and accurate, is to be conform to the reality, the accumulating to the experience and the processing to question method may take other similar projects as reference.