Analysis Of Dynamic Response Derformance Of New Type Of Unbonded Prestressed Debris Flow Dam

Debris flow is a natural geological characteristic of the mountain areas.It is due to the strong precipitation(rain and snow melt, glaciers) to form a large amounts of sediment entrainment, special flood clastic rocks and other solid material, it has broke out suddenly, history is short, aggressive, strong impact and defensive difficulties etc.In recent years, debris flows have occurred frequently in our country,Gansu, Yunnan,Sichuan and other places are particularly affected by the disaster,that not only caused huge economic loss to the country and people, but more serious casualties.So the effective prevention and control of debris flow is of great significance.At present, the main prevention and control measures of debris flow include three types: prevention and forecasting, engineering control, and biological control. Building blocking dam is the main and effective means of engineering control. Studies have shown that the main reason of some blocking dam damaged is lack of shock resistance. The impact of debris flow including debris flow slurry pressure and the impact force of big stones,and the latter is the main factor of dam damage. This paper put foeward a built-in unbonded prestressed steel strand debris flow structure to improve the impact resistance of dam that based on the analysis of a large number of literatures and engineering design data, and its impacted behavior is analyzed by the explicit dynamic analysis software ABAQUS. The main work in this paper is as follows:(1)Reference since the self-centering system has good energy dissipation principle, joined in the debris flow dam since the reset component, make ordinary gravity debris flow dam has the self-centering function.Respectively established the finite element model of the general gravity debris flow dam and self-centering debris flow dam, the analysis of comparison between the self-centering dam and ordinary gravity dam is made on displacement, deformation, stress distributionde, impact,reaction force, acceleration and energy(2)Respectively discusses the bigest reaction force, the bigest displacement and the bigest acceleration of the ordinary gravity debris flow dam and self-centering dam on the condition of different Pre-tightening force,different impact speed and different impact height. Influence rule of various parameters on the dam are obtained.(3) In order to further improve the impact resistance of the dam, based on the built-in unbonded prestressed debris flow dam, block combinational debris flow dam is proposed. And its dynamic responses of stone impact was simulated and analyzed to verify the superior shock resistance of the block combinationa dam.(4) Combining with the numerical simulation analysis result, the optimization design was carried out on the block combination dam, analyses its impact resistance under different impact speed and height, at the same time, this design made the detailed experimental scheme.