Stone blocking grate type three-dimensional roughening method for damming

Abstract

The invention provides a stone blocking grate type three-dimensional roughening method for damming. According to the stone blocking grate type three-dimensional roughening method for damming, a stone blocking grate is arranged at the downstream position along a berm in a damming colure gap area and prevents damming materials from running off, the stone blocking grate is an array structure composed of multiple stone blocking piles, the height of the stone blocking grate is 0.4 to 0.8 time that of the berm. According to the optimal arrangement mode of the array structure composed of the multiple stone blocking piles, any one of every two adjacent columns of stone blocking piles are arranged at the positions corresponding to the centers of gaps between the stone blocking piles of the other column, any one of every two adjacent rows of stone blocking piles are arranged at the positions corresponding to the centers of gaps between the stone blocking piles of the other row. By the adoption of the stone blocking grate type three-dimensional roughening method for damming, the wastage rate of the damming materials can be reduced during closure of a high-difficulty damming closure gap, the economical efficiency of a damming project is improved, the flow speed, the fall and the unit stream energy of the closure gap are reduced, and the safety of damming and successful damming are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of interception in water conservancy and hydropower projects, and in particular relates to a three-dimensional roughening method for interception of river courses and river engineering, and has a relatively high hydraulic index for the interception of a dragon mouth. Background technique [0002] In river engineering, especially in the construction of water conservancy projects, closure is a key link in engineering construction, and difficult closure is the top priority. Generally, the discriminant indicators for difficult closure are: high flow velocity (flow velocity greater than 6m / s), large drop (drop greater than 6m), and large single-width power (single-width power greater than 80t·m / (m·s)). For projects where a single index exceeds the standard by 5% to 10%, although the broken line embankment described in the patent CN201010129949.3 can be used to intercept the flow. However, after entering the Long...

AI Technical Summary

Problems solved by technology

For the ultra-high closure hydraulic index, that is, the flow velocity is greater than 8m / s, the drop is greater than 10m, and the single-width power is greater than 120t·m / (m·s), the closure project needs to be combined with the control discharge of the upstream power station. But it will affect the operation and dispatch of the entire river basin power grid

During the period of regulation and closure, the throwing intensity is required to be very high, and the amount of artificial interception materials to be used is high, so not only is the cost high, the construction is difficult, but also the loss rate of the interception materials during this period is high, and the embankment head It is prone to collapse under the action of water flow, threatening the safety of construction personnel and mechanical equipment, and the risk of closure failure is extremely high

Images