Gravity type cement-sand-gravel dam and construction method thereof

Abstract

The invention discloses a gravity type cement-sand-gravel dam and a construction method thereof. The cement-sand-gravel dam comprises an upstream dam surface which is vertically arranged; key walls are arranged at the positions of a dam toe and a dam heel; the contact surface of a dam body and an overflow surface is of a step-shaped structure; the upstream dam surface, the dam toe and the dam heelare composed of slurry-rich cement-sand-gravel; the dam body is composed of cement-sand-gravel; and the overflow surface is provided with a reinforced concrete layer. According to the gravity type cement-sand-gravel dam and the construction method thereof, the contact surface of the dam body and the overflow surface is of the step-shaped structure, so that the occlusion effect between two materials can be improved, and the phenomenon that the dam body is damaged along the contact surface under the action of dynamic water pressure can be avoided; and the earth volume of the dam body can be decreased, direct discharge can be realized, and a discharge facility is not required to be additionally constructed.

Description

technical field [0001] The invention relates to a construction method of cemented sand and gravel, in particular to a gravity type cemented sand and gravel dam and a construction method thereof. Background technique [0002] With the continuous construction of water conservancy projects, the limitations of earth-rock dams and concrete dams are gradually revealed. In the process of actual engineering design, such difficulties are often encountered: one is that there is no suitable clay anti-seepage material near the dam site, which is discretely distributed in block shape or thin in thickness, which makes mining difficult; the other is that the hard rock near the dam site Lack of stockyards, or deep burial and poor mining conditions, or low rock strength is not suitable for rockfill or concrete aggregates; third, there is no natural sand and gravel near the river channel where the dam site is located, and it can only be purchased from far away ; These problems lead to the lo...

AI Technical Summary

Problems solved by technology

In the process of actual engineering design, such difficulties are often encountered: one is that there is no suitable clay anti-seepage material near the dam site, which is discretely distributed in block shape or thin in thickness, which makes mining difficult; the other is that the hard rock near the dam site Lack of stockyards, or deep burial and poor mining conditions, or low rock strength is not suitable for rockfill or concrete aggregates; third, there is no natural sand and gravel near the river channel where the dam site is located, and it can only be purchased from far away ; These problems lead to the loss of technical advantages and economics when choosing an earth-rock dam or a conventional concrete dam

[0003] Cemented sand and gravel dams have many advantages, such as low strength requirements for dam materials and low aggregate performance requirements; the range of aggregate selection is flexible, and the cost and environmental burden can be significantly reduced by using readily available excavation materials at the project site; The construction progress can be accelerated by simplifying the construction facilities, saving the aggregate processing equipment and simplifying the construction equipment to reduce the construction cost, and can use conventional machinery to obtain rapid construction; the current research on the construction method of cemented sand and gravel dams is only in the preliminary stage , no more systematic results have been formed; the problem of low bonding force and strength between the dam body and the overflow surface during the construction of the cemented sand and gravel dam has not been resolved, which greatly limits its application

Images