Study On Compound Grouting Material And Construction Technology Of The Changjiang River Three Gorges Project

Attracts worldwide attention the the Changjiang Rive Three Gorges r project, in the dam base scope has different the scale geological flaw and so on fault crushed zone, contains will meet the water electrode to be easy to soften contains the putty band, the modulus of deformation is 0.2~1.0GPa generally, took the construction foundation, after the stress will have the compression deformation and the detrusion, will be extremely disadvantageous to the building foundation stress transmission. This article profits from some successful project experiences, in view of the fault tectonite, contains the putty band the character and the characteristic, has carried on the CW series modified epoxy chemistry grouting material development, the dry grinding superfine grouting cement and the grouting craft and the engineering research, proposed uses the high-pressured cement chemistry compound grouting to carry on grouting reinforcement processing to the similar F215 fault, provides the material and the technical strut for Three Gorges Project processing similar fault processing.The development CW series modified epoxy chemical grouting material, by hates the river character primarily concurrently water affinity, in under the grouting pressure impetus, can drive the water by the thick liquid, may fill the nature well, solidifies the body intensity high, with does, wet contains the drinking water and the pressure flow water is filled the carrier cementation intensity to surpass the domestic and foreign similar products, the impervious performance and the lasting quality are fine. Allots construction craft and equipment which adapts, can immit the wet grinding cement, the modified cement is unable the fault, the pelization band microscopic checks which immitting.The superfine cement physics and chemistry performance, the thick liquid material performance research indicated that, The cement degrades in size the after intensity obtains the remarkable enhancement, may fill the nature, but the water demand increases. When uses the small water ratio is in the milk must mix adds the ration to reduce the water medicinal preparation, by enhances the thick liquid material to flow, may the make ideal stable thick liquid material.Uses method and so on thermal analysis technology, XRD, SEM to the water- cement ratio, the sur- medicinal preparation, the ambient temperature indicated to the dry grinding thin cement hydration performance and the microstructure influence research that, The water- cement ratio increase cement speed speeds up, hydrated degree enhancement;In the limestone the CH content increases along with the water-cement ratio obviously increases;After mixxing water reducing admixture, the hydrated exothermic peak moves, the heat-release rate reduces, like whenhydration the temperature enhances, the hydration heat exothermic distinct enhancement, the same age time stone increases along with the water ratio, stirs the time to lengthen, between the stone hydration product joins changes loosely, the harmful hole also along with it increase, stirs the time take not to surpass 2h as suitable;Grows along with the hydrated age time, congeals hydrated product and so on colloid, CH and ettringite increases, the structure is compact gradually.The grouting craft research and the project application result indicated that, Uses the development chemistry grouting complete set of equipment and the high-pressured water cement -chemistry compound grouting with high spurts the flushing pretreatment craft technology is feasible, the fault spot crag body is in the milk after the dry grinding thin cement with the high-pressured function under the chemistry size long time infiltrates, the seepage, is loose, half loose fault tectonite and the pelization band, after fills the drill hole static ball mold and takes the core test specimen mechanics target to indicate the fault zone modulus of deformation may achieve above 5GPa, affects the belt modulus of deformation to be bigger than 12GPa, other mechanics targets also correspondingly increase, the fault guarded against infiltrates the performance, the overall mechanics performance obtained the very big enhancement, met the design requirements.