Earth-rockfill Dam Crest Seismic Structure and Its Construction Method

Abstract

The invention discloses a high earth-rock dam crest anti-seismic structure and a construction method thereof. The crest anti-seismic structure of the high earth-rock dam includes frame frames and slope protection nets arranged within the range from 3 / 4 to 4 / 5 of the dam height to the crest of the high earth-rock dam; the frame frames are arranged in the dam body, including cross The connected flat sheet along the river and the flat sheet in the axial direction of the dam; the slope protection net is arranged on the dam surface and connected with the frame frame. The construction method is used for constructing the above-mentioned high earth-rock dam crest anti-seismic structure. Both the flat sheet along the river and the flat sheet in the axial direction of the dam are flat structures, which have good anti-rolling effect and strong friction with the rockfill material; the flat sheet along the river and the axial flat sheet of the dam are respectively If it is set along the flow direction of the river and the length direction of the high earth-rockfill dam, it can resist the seismic force in the corresponding direction, and the seismic effect is better; the frame frame can constrain the granular rockfill material as a whole, and the slope protection net can protect the dam surface, The latticework and slope protection mesh work together to enhance the overall seismic performance of the structure.

Description

technical field [0001] The invention belongs to the field of water conservancy and hydropower engineering, and in particular relates to an anti-seismic structure of a high earth-rock dam crest and a construction method thereof. Background technique [0002] 80% of my country's water energy resources are concentrated in the west. With the development of social economy and the increase of energy demand, a large number of high dams will be built in these places to develop and utilize these water energy resources. The earth-rock dam has the advantages of easy material selection, low cost, simple structure, and good seismic performance. It is a dam type widely used in water conservancy and hydropower engineering construction. However, the western region is also an area of ​​high seismic intensity in my country, and these large reservoirs and high dams will inevitably be subjected to strong earthquakes. The earthquake damage of high earth-rockfill dams has shown that the "whip sh...

AI Technical Summary

Problems solved by technology

[0003] Before the present invention, the seismic measures of laying geogrids, steel bars or embedding concrete beams were generally adopted on the crest of high earth-rock dams, but in the actual construction process, it was found that after the geogrids were rolled by heavy machinery, the grid nodes would peel off and the fracture and damage of grid strips, etc., resulting in a large loss of geogrid strength, and the durability of geogrid is also difficult to guarantee; in addition, due to the small mesh size of geogrid, the maximum particle size of rockfill in high earth-rockfill dams can be up to 100cm, therefore, large-sized rockfill cannot be embedded in the geogrid mesh

As the steel bar is a circular member, the interaction area between it and the rockfill material is small, so the interface friction between it and the rockfill material is small. Ordinary steel bars are also prone to corrosion. Anti-rust treatment measures such as asphalt plastering are used on the surface of the steel bars. After large-scale vibratory rolling machinery is rolled, the asphalt will be peeled off from the steel bars, which cannot fundamentally solve the problem of reduced earthquake resistance caused by steel bar corrosion

Whether it is cast-in-place concrete seismic beams or prefabricated concrete seismic beams, there are problems of high investment costs, complicated construction process, and impact on the construction period, and because heavy machinery cannot directly roll on the beams, it is convenient for subsequent dam filling construction The concrete anti-seismic beams cannot adapt to the uneven natural settlement of the dam after completion and the permanent deformation under the earthquake

Images