| Debris flow is a common natural geological disaster in mountainous areas, which has the characteristics of short duration, strong sudden, destructive and short duration. China has a vast territory, complex and diverse topography and complex geological structure, climate is a sub tropical monsoon climate, summer rainfall is abundant, so that China has become a high incidence of debris flow disasters. Through in Zhonggang Gully Watershed of the engineering geological conditions, development distribution and basic characteristics, in the calculation based on the theory of fluid mechanics, in Zhonggang gully debris flow simulation, select the debris flow control works in the first grade, second grade sand dam, set up a structure model of the same size as the actual engineering, fluid solid coupling analysis of debris flow and silt dam, to judge the silt dam in debris flow motion of interceptive effect and comprehensive management mode of in Zhonggang gully research.The main contents are as follows:1) Based on field investigation and data collection, analysis of the catchment characteristics and engineering geological conditions inZhonggang gully watershed; Research status at home and abroadabout debris flowmovement and numerical simulation analysis,determine the research object and the research method;According to the basic characteristics of Zhonggang gullydebris flow in the hills, and dynamic characteristics can be divided into type heavy rain- valleys- high density- low frequency- big- viscous debris flow.2)Based on the theory of computational fluid dynamics, the finite volume method is used to calculate the debris flow in Zhonggang gully.3)Based on duty in the Zhonggang gully of the engineering geological data, Use AutoCAD, RHINO and other three-dimensional modeling software to build a three-dimensional terrain model of Zhonggang gully.According to the dynamic characteristics of debris flow, debris flow reasonable selection control parameters, boundary conditions, using CFX software in Zhonggang gully debris flow for simulation and analysis of the whole process in Zhonggang Gully Watershed of the velocity field and pressure field.4)Based on ANSYS Workbench software of debris flow and slope, debris flow and silt dam of two-phase flow, fluid solid coupling analysis, it is concluded that the debris flow and blocking sand dam coupling fluid change, debris flow velocity vector distribution map, debris flow on the slope of gully bed stress cloud chart and so on, and the flow field data into Satic structural got No. 4 and No. 5 sand dam dynamic response characteristics(stress, strain and displacement etc.), the comparison and analysis of the combined effects of sand dam stopped,and obtained the protection action of sand bar in debris flow movement, and the corresponding structure optimization design proposal is put forward according to the fluid solid coupling result of debris flow and sand bar.5) In view of the current situation of the management of debris flow in Zhonggang gully, the main problems and deficiencies in the existing control engineering technology of debris flow are analyzed and summarized, and the integrated management mode of Zhonggang gully debris flow is studied. |
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