Roller-compacted concrete structure formed by pouring composite slurry into stone ballast and construction method of roller-compacted concrete structure

Abstract

The invention discloses a roller-compacted concrete structure formed by pouring composite slurry into stone ballast. The roller-compacted concrete structure consists of a plurality of composite-slurryroller-compacted concrete layers, wherein the composite-slurry roller-compacted concrete layers are formed by performing vibration rolling on the stone ballast and the composite slurry poured onto the surface of the stone ballast; the stone ballast is an excavated material with a particle diameter being greater than or equal to 5 mm; and the stone ballast is laid on a dam foundation in layers, the composite slurry is poured into the stone ballast laid in layers to fill gaps in the stone ballast randomly, and when the liquid level of the composite slurry gets close to the top surface of the stone ballast, rolling is performed on a storehouse surface through a vibrating roller to form a uniform, stable slurry-poured roller-compacted concrete structure. The roller-compacted concrete structure has the advantages of use of local materials, uniform and stable structure, excellent performance, fast construction and project cost saving. The invention also discloses a construction method of the roller-compacted concrete structure formed by pouring the composite slurry into the stone ballast.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering materials, structures and construction, more specifically, it is a roller compacted concrete structure in which composite slurry is injected into gravel materials. The invention also discloses a construction method of the roller compacted concrete structure in which the composite slurry material is injected into the stone slag material. Background technique [0002] Concrete face rockfill dam is currently one of the most competitive and promising dam types in dam construction. This dam type has many advantages such as low cost, high safety, and strong adaptability, so it is favored by the dam industry. It is widely valued, has excellent application prospects, and is the preferred dam type for many projects; at present, there are more than 150 concrete face rockfill dams built or under construction in my country, of which 37 are over 100m; the development of mode...

AI Technical Summary

Problems solved by technology

[0003] With the acceleration of hydropower development in Southwest my country, there are many places suitable for building high-face rockfill dams in areas with inconvenient transportation and economically underdeveloped areas, such as the Jinsha River, Lancang River, Nujiang River, Yalong River, Dadu River, and the upper reaches of the Yellow River, as well as the Yarlung Zangbo River in Tibet. The topography and geological conditions of the river valley, such as Gushui, Maji and other hydropower stations, the dam height is about 250-300m, because the engineering characteristics, key technologies and operation characteristics of the 300m high face rockfill dam cannot be directly selected. Instead, choose the concrete dam scheme with large external transportation volume and high cost or the earth core rockfill dam scheme with large volume and occupying a lot of cultivated land, which is likely to cause adverse effects on the environment and soil and water conservation. Some projects even have no dam near the dam. The available anti-seepage soil materials reduce the economic competitiveness of the hydropower station, and all construction parties are eager to make breakthroughs in the construction technology of 300m high concrete rockfill dams

[0004] However, facing the construction goal of 300m or even higher super-high concrete rockfill dams, there are still many key technical problems, such as the reasonable division of super-high rockfill dams, the influence of the characteristics of dam construction materials on the deformation characteristics of the dam, The deformation characteristics and safety of super-high rockfill dams, seismic safety and engineering measures, etc., especially when dams are built on the foundation of deep overburden, it is difficult to break through the limitation of dam height. Bottleneck: The existing concrete technology applied to the lower foundation of ultra-high rockfill dams usually requires grading and the particle size of rocks or pebbles. In the construction method, concrete needs to be produced in a mixing building, and consumables are time-consuming

Images