Debris Flow Drainage Engineering Design And Optimization

Supported by the nation west traffic construction science and technology item "Study on initiation mechanisms and control measures of debris flows along highway in active fault zone No.200831800087", took the prevention and control of 25 the debris flow gullies along Ya Lu highway for the background, and based on analyses of research on prevention and control of debris flow domestic and abroad, combinated of field survey, data analysis and other means. Then the key parameters of the debris flow, the design of drainage projects and optimization have been studied, at last the research had been applied to the design of eight debris flows along the Ya-Lu speed way and seven in Wenchuan area. The main work of this paper is as follows:1. By analyzing the current situation and lack of survey methodology, the paper used Google Earth to get terrain parameters for the debris flow; and through regular inspection and test for the debris flow, that we got the unit weight and the formation parameters in the basin.2. That focused the key parameters to design drainage project-discharge, compared the rainfall-flood mothed, Forms-section method and the storm-ice complex calculation of debris flow, and used examples to verify the applicability of the methods; Taking the research on the distribution of velocity for centralization, on this basis of analysis of velocity formula of debris flow in rectangular drainage canals, by reasonable abstraction and assumptions, the paper cut up the section of V-shaped drainage canal indefinitely, based on the limit thought, derived the expressions of the velocity's horizontal distribution of debris flow, and gave an example to validate its applicability.3. Summary of existing theory and technology of debris flow drainage engineering, and take eight (four with V-shaped drainage engineerings, another four with diversion dikes) debris flow gullies along the Ya Lu highway prevention for the background, the paper has calculated the drainage engineering that had been built,proposed amendments to optimizate the existing measures.4.Based on the dynamic test monitoring on the information of debris flow, proposed three dynamic optimum design projects of drainage engineering; On the basis of the velocity's horizontal distribution of debris flow in the V-shaped drainage canal, according to the distribution of erosion thickness, the paper summarized three types of optimum design to be able to bear abrasion;Based on the principle that profiled blocks can dissipate energy and protect erosion, the paper took the protection and control of Que'er debris flow gully for the engineering background, installed the profiled blocks in corner of the diversion dike to apply this method.