摘要：Debris flow drainage canal is one of the most widely used engineering measures to prevent and manage debris flow *** shape and the sizes of the cross-section are important parameters when design debris flow drainage ***,how to design the appropriate shape and sizes of the cross-section so that the drainage canal can have the optimal drainage capacity is very important and few researched at home and *** study was conducted to analyze the hydraulic condition of a Trapezoid-V shaped drainage canal and optimize its *** assuming characteristic sizes of the cross-section,the paper deduced the configuration parameter of the cross-section of a Trapezoid-V shaped debris flow drainage *** theory analysis,it indicates that the optimal configuration parameter is only related to the side slope coefficient and the bottom transverse slope *** this study,the Heishui Gully,a first-order tributary of the lower Jinsha River,was used as an example to design the optimal cross-section of the drainage canal of debris flow.

摘要：The erosion shape and the law of development of debris flow sabo dam downstream is a weak part in the study on debris flow erosion. The shape and development of scour pit have an important effect on the stability and safety of debris flow sabo dam, which determines the foundational depth of the dam and the design of protective measures downstream. Study on the scouring law of sabo dam downstream can evaluate the erosion range and reasonably arrange auxiliary protective engineering. Therefore, a series of flume experiments are carried out including different debris flow characteristics(density is varying from 1.5 t/m3to 2.1t/m3) and different gully longitudinal slopes. The result shows that the scour pit appears as an oval shape in a plane and deep in the middle while superficial at the ends in the longitudinal section, the position of the maximum depth point moves towards downstream with an increase of flume slope *** maximum depth of scour pit is mainly affected by the longitudinal slope of gully, density of debris flow,and the characteristics of gully composition(particle size and the viscosity of soil). The result also indicates that the viscosity of soil will weaken the erosion *** interior slopes of scour pit are different between the upstream and the downstream, and the downstream slope is smaller than the upper one. For the viscous and non-viscous sands with the same distribution of gradation, the interior slope of nonviscous sand is smaller than the viscous *** to the regression analysis on the experimental data, the quantitative relationship between the interior slope of scour pit, slope of repose under water and the longitudinal slope of gully is established and it can be used to calculate the interior slope of scour pit. The results can provide the basis for the parameter design of the debris flow control engineering foundation.

摘要：Drainage canals are engineering structures widely used for debris flow *** passing through a drainage canal,debris flow usually scours the gully bed at the back of the rib sill of the drainage canal,which leads to failure of the rib ***,the scour depth at the back of the rib sill is an important design problem and it is related to the economic benefits of engineering and service *** explore the law of the depth of the scour pit after debris flow through drainage canal ribs,we first proposed a formula for the calculation of the maximum scour depth at the back of a rib sill based on energy *** then conducted a series of simulation experiments to test the proposed *** experimental results show that the scour depth,trench slope and the distance between ribs all increase with a decrease in debris flow *** then compared the results of experiments and formula *** the testing analysis,we found that the calculation results of the conductedformula correspond with the experimental results ***,taking Qipan Gully as an example,we designed the ultimate depth of a drainage canal for debris flow using the calculation formula.