Study On Impact Force Of Debris Flow Based On Material Composition And Impact

At present,the debris flow scholars have developed various types of debris flow models,so that the study of debris flow mechanism has made positive progress.However,there is still no common debris flow model accepted by domestic and foreign counterparts.Therefore,the study of debris flow mechanism is still the focus and difficulty of debris flow research in the future for a long period of time.In this paper,the impact force of debris flow is studied.The solid-liquid two-phase flow theory,non-Newtonian fluid mechanics and sediment mechanics debris flow impact force are studied.The results show that the particle size,Debris flow bulk density,debris flow viscosity and debris flow velocity in several aspects,combined with debris flow field observation data to get the debris flow impact force calculation of the new formula,and indoor model test results and field observations on the type of practical correction,to have practical value A new formula for calculating the impact force of debris flow.(1)Based on the sedimentary characteristics of hydrothermal flow,dilute debris flow and viscous debris flow,and the solid phase material in the viscous debris flow fluid is in reverse order structure,the influence on the bulk density of debris flow is analyzed.According to the existing debris flow experimental data,The calculation of the bulk density of the hydrothermal flow,the dilute debris flow and the viscous debris flow associated with the solid particle size and the viscosity of the slurry,and compared with the existing classical debris flow bulk density formula,The calculated values of debris flow volume only consider the bulk density and solid ratio of solid matter in debris flow,but do not consider the influence of debris flow viscosity and solid particle size gradation on debris flow bulk density.Therefore,different kinds of debris flow bulk are the same value.(2)Based on the analysis of the flow rate calculation method of water flow,dilute debris flow and viscous debris flow,the corresponding calculation formula of flow velocity is obtained,and compared with the existing formula of calculating the velocity of the conventional debris flow velocity,the classical calculation formula of debris flow velocity is commonly used The average flow rate,the actual debris flow rate in the circulation area should change with time,and in most cases only consider the average flow depth of debris flow and debris flow gutter bed drop,resulting in flow rate value regardless of the circumstances are the same value.(3)By introducing the wavelet denoising method,this paper uses the symfunction analysis in MATLAB to analyze the frequency.Debris flow impact is a non-uniform and stable signal,the impact of water and stone flow signal noise reduction map can be seen that the whole process of the impact of water flow is relatively continuous,no clear wave crest,and rare rheological flow impact process there are peaks,from the spectrum analysis Look,the energy is mainly concentrated in the low frequency part,that is,d7 band and d8 band part.Viscous debris flow impact process peak obvious,from the spectral analysis point of view,viscous debris flow impact low frequency part is still the main part of energy,and contains some of the low frequency band,namely d5 band,d6 band,d7 band and d8 band,indicating debris flow impact process Although it is a transient process,but the impact of changes in water than the rock and rare debris flow changes more complex.(4)The results show that there are turbulence stress and intergranular forces,which belong to the two-phase flow model.The viscous debris flow According to the theory of faucet pressure,the viscous debris flow is regarded as compressible fluid to establish the continuous equation to solve.Finally,the water particles with equivalent particle size,viscosity and bulk density of solid particles are obtained respectively.Calculation method of impact force of flow,dilute debris flow and viscous debris flow.(5)Compared with other formulas and measured values,the reason is that the particle size of the particles is not very different under the experimental conditions,and the difference is not significant And the hydrothermal energy of the hydrothermal fluid is larger.The reason of the dilute debris flow is that the viscosity is changed by the chemical raw material and the loss of the clay particles.The loss of the clay particles will inevitably result in the change of the bulk density of the debris flow,and the actual dilute debris flow The viscous debris flow is due to the strongness of the viscous debris flow movement,its viscosity effect can not be ignored,and the fine clay content is more,its own inertia force,turbulent stress is small,the movement speed is fast,so the kinetic energy,Viscous debris flow impact is great.