High core wall rock-fill dam foundation seepage prevention structure on deep overburden layer

Abstract

The invention discloses a dam foundation seepage prevention structure, in particular to a high core wall rock-fill dam foundation seepage prevention structure on a deep overburden layer. The invention provides the high core wall rock-fill dam foundation seepage prevention structure on the deep overburden layer with a better seepage prevention effect. The high core rock-fill dam foundation seepage prevention structure comprises a main seepage prevention wall, an auxiliary seepage prevention wall, a main seepage prevention wall plane grouting curtain, an auxiliary seepage prevention wall plane grouting curtain and connecting curtains, wherein the bottoms of the main seepage prevention wall and the auxiliary seepage prevention wall respectively penetrate a riverbed covering layer to be inserted into bed rock, and the auxiliary seepage prevention wall is arranged on the upstream side of the main seepage prevention wall; the main seepage prevention wall plane grouting curtain is arranged on the junction of the main seepage prevention wall and the bed rock, and the auxiliary seepage prevention wall plane grouting curtain is arranged on the junction of the auxiliary seepage prevention wall and the bed rock; two connecting curtains are respectively arranged on two river banks, and the connecting curtains are connected with the main seepage prevention wall plane grouting curtain and the auxiliary seepage prevention wall plane grouting curtain. By adopting the connecting curtains, the leakage of water when the water flows around the auxiliary seepage prevention wall on a bank slope can be reduced, the water head ratio borne by the auxiliary seepage prevention wall can be increased, and the combined seepage prevention of the main seepage prevention wall and the auxiliary seepage prevention wall can be realized.

Description

technical field [0001] The invention relates to a dam foundation anti-seepage structure, in particular to a dam foundation anti-seepage structure with a high core wall on a deep covering layer. Background technique [0002] Hydropower is a clean and renewable energy with the characteristics of mature technology, low cost and flexible operation. All countries in the world put hydropower development in the priority position of energy construction. The earth-rock dam has the advantages of easy material selection, low cost, simple structure, strong foundation adaptability, and good seismic performance. It is a dam type widely used in hydropower and water conservancy projects. In recent years, with the in-depth research on the properties of earth-rock dam materials and the progress of construction technology, the construction of high earth-rock dams on deep overburden has developed rapidly. Because most of the overburden has strong water permeability, the anti-seepage design of ...

AI Technical Summary

Problems solved by technology

Curtain grouting is used to prevent seepage on the strong permeable covering layer, and multiple curtains need to be installed. The construction period required for grouting is long, and the grouting amount of the covering layer is large, and the investment is high. The permeability coefficient of the curtain after grouting is still large, which may still not meet the requirements. The anti-seepage requirements of high dams; the two anti-seepage walls arranged in a centralized manner are not conducive to the stability of the hole wall of the anti-seepage wall due to the small distance between the walls, and the anti-seepage walls need to be constructed one by one, and the construction period is very long, which seriously restricts the filling of the dam body. Overall construction and engineering progress

The anti-seepage structure of the main and auxiliary anti-seepage walls is only provided with grouting curtains on the bedrock at the bottom of the auxiliary anti-seepage wall. Due to the high water permeability of the strong unloading rock mass of the bank slope, the reservoir water will flow on the bank of the auxiliary anti-seepage wall. Seepage around the wall at the bedrock of the slope, so most of the water head is borne by the main cut-off wall, and it is impossible to truly realize the joint seepage prevention of the main and auxiliary cut-off walls

Images