Study Of Rock Cement Grouting On Dam Site

In despite of the continually development of new technology and new material, cement grouting keeps the most important status on the technology and economy in the project of foundation processing, dam seepage control and dam reinforcement. Especially after the "98 super flood", numbers of dams needs to be repaired and reinforced, which of medium and small reservoir in our country. The cement grouting is widely used in dam anti-seepage and reinforced. To ensure the dam safety and grouting effect, according to the field archetype inspect test of the impervious wall as well as reinforced grouting to the cement stone masonry dam of the Yingnahe Reservoir Extension Project, we studied the grouting quality and effect and its infection to the construction from the perspective of the cement perfusion ability, the crack grouting diffusion radius and the relationship of grouting pressure and ground displacement.The main parts of my work are as follows:1. Perfusion ability analysis of the cement grout. The main factors influence the cement grout perfusion ability are as follows: Grain size of the cement grout, grain cohesion state of the cement grout, stability of cement grout bleeding and sedimentation, Theological behavior of the cement grout etc. In the narrow crack, to enhance the cement grouting ability, the efficiency measures are as follows: to reduce the grain size, to enhance the dispersancy of cement grout, to increase the grouting pressure. It is no use to increase the water-cement ratio.2. Study of the crack grouting diffusion radius. The crack grouting diffusion radius is the basic gist of the grouting construction design and grouting craftwork control. With the study of the cement flow rule in the crack, we analyzed the influence to diffusion radius by the grouting pressure, cement rheological parameter and grouting time.3. The relationship of grouting pressure and ground displacement. The grouting effect parameter of grouting quantity and the ground displacement has relationship with grouting pressure, grouting material and grouting depth etc. In many conditions, the controlled ground displacement is harmless as well as grouting. It is voidable of the absolute no displacement grouting. If it doesn't bring breakage, definite displacement is allowable.4. Concrete impervious wall archetype inspect result and its analyze. The cement stone masonry dam of the Yingnahe Reservoir anti-seepage depends on the front concrete impervious wall. Otherwise, the impervious wall is only 0,5m in some parts, as well as grouting, we do the real-time inspect and analyzed the result.