Debris flow control dam for adjusting peak discharge as well as design method and application thereof

Abstract

The invention discloses a debris flow control dam for adjusting peak discharge as well as a design method and application thereof. The debris flow control dam includes a dam foundation and a dam body, wherein a flow control hole used for downstream discharging debris flow is formed in the bottom of the dam body, and a downflow weir is arranged at the top of the dam body; the downflow wire is positioned right above the flow control hole; altitude difference between the top surface of the flow control hole and the bottom surface of the downflow wire exists; sizes of the cross sections of the flow control hole and the downflow wire, and the altitude difference between the top surface of the flow control hole and the bottom surface of the downflow wire are respectively confirmed according to parameters such as the maximum peak discharge of debris flow, downstream designed discharge and diversion quantity, downstream designed silt storage quantity, and duration time of peak discharge of debris flow exceeding the design flow. According to the invention and compared with the prior art, flow process of the debris flow can be adjusted and controlled through fully utilizing the adjusting storage capacity of the flow control dam, the flow of discharged debris flow can be controlled within a designed flow range, the efficiencies of the downstream discharge and diversion project and the silt storage project are given to full play, so that safeguard for the downstream targets of protection is guaranteed, and generation of secondary disaster is avoided.

Description

technical field [0001] The invention relates to a mud-rock flow prevention and control technology, in particular to a mud-rock flow control dam capable of regulating the flood peak flow of mud-rock flow and its design method and application. Background technique [0002] Debris flow disaster is one of the main types of geological disasters in my country. On August 8, 2010, a large-scale debris flow broke out in Sanyanyu, Zhouqu County, Gansu Province. The debris flow silted up the county town and blocked the Bailong River to form a barrier lake that flooded nearly half of the county town, causing heavy casualties and property losses; on August 13, 2010 On the 1st, a large-scale mudslide broke out in Wenjiagou, Qingping Township, Mianzhu City, Sichuan Province, blocking the main river, causing more than ten people to die and disappear, and a large number of houses rebuilt after the Wenchuan Earthquake were buried. More and more attention has been paid to secondary disasters ...

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Problems solved by technology

[0004] The purpose of the present invention is aimed at the lack of measures in the current debris flow prevention and control to ensure that the drainage volume and silting volume after passing through the blocking project do not exceed the design standard, and for the debris flow prevention and control of the lower section of the circulation section that has the condition of building a larger storage capacity flow control dam, provide A debris flow control dam for regulating flood peak flow and its design method and application, which controls the discharge of debris flow within the design flow (discharge volume plus silting volume) and then discharges downstream, giving full play to the downstream drainage engineering and parking The efficiency of the silting project not only provides sufficient protection for the downstream protection objects, but also prevents the mud-rock flow beyond the design standard from blocking the main river and forming a barrier lake to cause secondary disasters

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