Gravel masonry dam material filling construction method in cold region

Abstract

The invention discloses a gravel masonry dam material filling construction method in a cold region. The construction method includes: plane surveying of filling units; side boundary measuring and paying off of the filling units; acceptance inspection of basic planes; material exploitation, material feeding and material discharging; digging and loading of filling materials, and water adding outside a dam; material leveling and layer thickness controlling; watering replenishing; grinding; and grinding quality checking. The material exploitation is performed in a belt-shaped interval exploitation method, namely, when stock ground exploitation is performed in non-low-temperature seasons, a belt-shaped material source is reserved for exploitation in low-temperature seasons during the exploitation, and by means of natural water loss of the reserved belt-shaped material source, moisture content in gravel stone materials is lower than 2%; and the grain size of the gravel masonry dam shell materials is smaller than 0.075mm, particle content is lower than 3%, moisture content is no lower than 5%, and nonuniform coefficient Cu is larger than or equal to 15. The gravel masonry dam material filling construction method solves the technical problem of uneven sediment of deep covering layer in the dam body filling by stages, fully utilizes gravel masonry dam shell material filling construction in low-temperature seasons of winter to speed up engineering process, and ensures construction image and construction quality.

Description

technical field [0001] The invention relates to a construction method, in particular to a dam body filling construction method. Background technique [0002] As one of the main dam types of water conservancy and hydropower projects, sand and gravel earth-rock dams are widely used in various regions of the world, especially in the Qinghai-Tibet Plateau, where the geological structure is young and sparsely populated. There are abundant sand and gravel resources on both sides of the rivers, which can be used as natural dams. Damming material. Sand and gravel has the characteristics of easy mining, low cost, reasonable gradation, easy construction quality assurance, etc., and has extremely high utilization value. [0003] Under normal conditions, the water content of sand and gravel is relatively high. During construction in low-temperature seasons, the dam material on the sand and gravel is easy to freeze, forming a frozen block of sand and gravel. It is difficult to compact t...

AI Technical Summary

Problems solved by technology

[0003] Under normal conditions, the water content of sand and gravel is relatively high. During construction in low temperature seasons, the dam material on the sand and gravel is easy to freeze, forming a frozen block of sand and gravel. It is difficult to compact the frozen block of sand and gravel during the rolling process.

After the temperature rises and the frozen blocks are thawed, the frozen blocks decompose into loose accumulations, which affects the filling quality of the dam body

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