Earthquake-resistant structure for dam crest of high earth-rock dam and construction method of earthquake-resistant structure

Abstract

The invention discloses an earthquake-resistant structure for a dam crest of a high earth-rock dam and a construction method of the earthquake-resistant structure. The earthquake-resistant structure comprises a lattice frame and a slope protecting net which are arranged in a range from 3 / 4-4 / 5 of height of the high earth-rock dam to the dam crest, wherein the lattice frame is arranged in a dam body and comprises river-along flat sheets and dam-axial flat sheets which are connected in a crossed manner; the slope protecting net is arranged on the dam surface and is connected with the lattice frame. The construction method is applied to the construction of the earthquake-resistant structure for the dam crest of the high earth-rock dam. The river-along flat sheets and dam-axial flat sheets are of a flat structure and have relatively good anti-grinding effects, and the friction effect between the flat structure and the piled stones is relatively strong; the river-along flat sheets and dam-axial flat sheets are respectively arranged along the flow direction of river and the length direction of the high earth-rock dam and are capable of resisting earthquake forces in corresponding directions, so that the earthquake-resistant effect is relatively good; the piled stones of granular materials can be integrally restrained by virtue of the lattice frame, the dam surface can be protected by the slope protecting net, and the integral earthquake resistance of the structure can be enhanced by virtue of common action of the lattice frame and the slope protecting net.

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...

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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

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