Multistage Block Portfolio Mode And Parameter Analysis Of Debris Flow

Debris flow is a kind of natural disasters which happen in the mountainous area. It is to be born for human to struggle with the debris flow. But with the production and living resources becoming scarce gradually, human activities have extended to mountainous and the deprive of natural resource become more and more frequent. These behaviors have result in the decrease of vegetation coverage rate and soil and water loss quickly. Debris flow has become the direct consequence of human incorrect behavior. Debris flow research has become a hot topic in the related field that focus on the formation of debris flow mechanism, prediction and control to distinguish. Debris flow disaster risk assessment and reasonable design. Debris flow model research analysis and test. Debris flow control planes and measures. Debris flow direction engineering structure design and so on.Debris flow block structure is based on the geological and geographical environment and the size on spot, weight, sedimentation depth in the area which is after debris flow to calculate the velocity and flow rate. According to the present standard,the impact can be calculated, then structure design is based on the most unfavorable conditions. The load on block dam is mainly: the dynamic load of mud and stone, the static load of the dam is filled late. The article from the perspective of computational fluid dynamics, with the method of CFX fluid-solid coupling numerical analysis, on the one hand, the impact effect of debris flow is considered; on the other hand, the static pressure which from the dam is filled by mud. The research contents are as follow:(1)The numerical analysis for flow field by one-way coupling of CFX software, it played a various influence on debris flow velocity and impact according to the analysis of debris flow channel slope and width,so these parameters must be considered into the flow field analysis.(2)For the influence of number of block dam, having a research for mud instantaneous wallop, the first impact, flow velocity change, static pressure under the four conditions respectively that is one dam, two dams, three dams, four dams.(3)Having a appropriate improvement on the basis of multistage block dam that is using the grille dam instead of gravity dam, consider grille dam is belong to permeable dam that can reduce flow velocity and filter coarse particle, then analyzing flow impact, velocity and dam response.(4)Take the Tanchang debris flow disasters engineering management as the background, compared with the results from the present standard formula, numerical simulation had a good reliability. It showed that the one-way coupling numerical analysis method is feasible and provided a new way to debris flow prevention and control. Engineering.