LIU Wenrun,CHEN Jiangang,CHEN Huayong,et al.Blocking Judgment of Check Dam Discharging Orifices based on Energy Dissipation Process[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):614-622.
LIU Wenrun,CHEN Jiangang,CHEN Huayong,et al.Blocking Judgment of Check Dam Discharging Orifices based on Energy Dissipation Process[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(03):614-622. DOI: 10.13409/j.cnki.jdpme.202004075.
Blocking Judgment of Check Dam Discharging Orifices based on Energy Dissipation Process
The blocking of discharging orifices has a large influence on the stability of dam structures and long-term safe operation. The design of discharging orifices of sand bars is mostly based on experience and lacks a quantitative analysis method. By analyzing the energy dissipation process of debris flows in the spillway hole, a method based on the acquisition of necessary parameters is proposed for determining the clogging of discharging orifices, and the influence of the design parameters of the discharging orifices and the clogging of debris flows property is analyzed. The rationality of the discrimination method is further verified by controlling the error within 15%. Finally, using this method to analyze the discharging orifice of the Wenjiagou check dam in Mianzhu city, Sichuan Province. The results show that the discharging orifices of the Wenjiagou dam are more likely to be filled with debris flows, which is consistent with the field investigation results. According to the theoretical analysis, it is suggested to install energy control facilities in front of the dam. Regulate and control the flow rate of debris flows into the discharging orifice within a reasonable range, so as to ensure the smooth discharge of debris flow.
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