Overbank flow foundation self-collapse dam geotextile emergency flood bypass

Abstract

The invention discloses an overbank flow foundation self-collapse dam geotextile emergency flood bypass, and belongs to the field of hydraulic engineering of emergency spillway projects and national defense of dams dealing with water attacks. The emergency flood bypass mainly comprises an overbank flow foundation self-collapse dam designed according to an overbank flow foundation self-collapse damdisaster prevention and damage reduction design theory. The overbank flow foundation self-collapse dam (1) comprises overbank flow foundation secondary self-collapse dams and overbank flow foundationwater guiding and pollutant flushing self-collapse dams. Protective surfaces of geotextile of the geotextile emergency flood bypass (2) comprise the geotextile scale-shaped protective surface (II-a),the geotextile belt passing scale-free protective surface (II-b), the concrete plate armour geotextile belt passing scale-free protective surface (II-c), the chemical fiber rope net loose-stone armour geotextile belt passing scale protective surface (II-d) and the L-shaped geotextile belt passing geotextile scale-shaped protective surface (II-e). The emergency flood bypass is suitable for a reservoir auxiliary dam, a main dam, a high dam and a high ditch head barrage, capable of achieving controllable and automatic emergency flood diversion, simple in structure, convenient to implement, low in manufacturing cost, safe, reliable and free of permanent land occupation.

Description

Technical field [0001] The invention belongs to the technical field of dikes and dam extraordinary flood conservancy projects, and also belongs to the technical field of national defense against water attacks, and specifically relates to a design method for flood diversion dams and geotextile extraordinary flood diversion channels. Background technique [0002] Japan July 5, 2018, a heavy rain in western Japan, a river in Mabe Town, Kurashiki City broke its bank; the torrential rain of No. 10 typhoon "Lion Mountain" in 2016 caused the bank to break in Hokkaido and Tohoku region; September 10, 2015 successively The two rivers had flooded their embankments and breached. After the rivers rose, the river broke the 20-centimeter-high embankment that exceeded the 10-year flood standard. The dyke breach not only caused a lot of property losses, but also caused difficulties for the evacuation of local government organizations due to the uncertainty of the flood. It also caused casualties...

AI Technical Summary

Problems solved by technology

At present, there is no design theory for self-collapsing dikes. The artificial blasting flood diversion method is generally used. The advantage can overcome the uncertainty of consolidated clay and hardened road surface. The disadvantage is that the flood season management and explosives management require high requirements. Once the blasting flood diversion is out of control

The failure of dams is very common. There is no feasible and consensus design theory for self-failure dams, and there is no complete set of technologies. The reason is that the current design theory of self-failure dams is to quantify and meet the flood standards stipulated in the code, that is, from the start of dam failure to the reservoir. The time when the water level rises to the standard water level coincides with the time of self-breakage of the dam, and the mechanism of various dam self-breakage phenomena is very complicated. At present, there is no mathematical model to solve it; at present, there is only a large-scale overall test of the self-breakage dam of the diversion channel through test methods. There are similarities. The statically indeterminate structure of the three-sided consolidated clay of the flushing trough complicates the problem. At the same time, the test cannot solve the problem of uncertainty, infinity of flood and uncertainty of self-collapse caused by consolidated clay and hardened road surface. At present, all self-collapsing dams designed through experiments must be rare and rare floods, which are hardly verified by practice; a large number of small and medium-sized dams, canal head works, dikes, canal structures, cofferdams, etc., are limited by economic and technical conditions. , the norms can only allow super-standard floods to destroy

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