Study On The Dynamic Characteristics Of Saturated Silt Based On Prestress Concrete Pipe Pile Driving Effect Experimental

Prestressed concrete pipe pile with high-level, high-rise buildings, deep-water port and large span Bridges and other projects of development needs, the prestressed concrete pipe pile in the engineering application of broader, so about the quality of the prestressed concrete pipe pile driving are more demanding. In this paper, the prestressed concrete pipe pile pile load transfer mechanism and sinking pile resistance in the process of analysis, determination of pile driving is required for external power choose to lay the foundation. In this paper, the pile driving power dynamic selection influence factors and the vibration of the hammer choice satisfy conditions are analyzed. During pile driving, because of the action of circular vibration, it can cause the change of the characteristics of soil around the pile. For powder soil layer, the cycle of structural vibration load will destroy the soil, the soil strength is reduced, achieve certain conditions silt liquefaction phenomena will happen, make the pile penetration more easily in the grave.In the process of vibration pile, it is very necessary of the dynamic strength study of silt.Through the theoretical analysis in the process of pile foundation, clear silt in the process of pile dynamic strength damage after standard, this paper select saturated silt, into the dynamic triaxial test, the test data for analysis. Research and analysis different dry density and consolidation ratio on the strength of saturated silt to move. Control consolidation ratio is different for different dry density (1.40g/cm3and1.50g/cm3) of silt, under different confining pressure (100kpa)50kpa,100kpa and the dynamic shear stress and damage under the vibration time relationship curve into the analysis:the same dry density and consolidation ratio under the condition of same, such as the failure time of vibration phase at the same time, with the increase of consolidation pressure, confining pressure, the dynamic shear stress of the silt is also increasing. Or destroy the dynamic shear stress at the phase at the same time, with the increase of consolidation pressure, destroy the vibration more required. In confining pressure is constant, the same dry density of silt damage vibration time, under the condition of dynamic shear stress increases with the increase of consolidation ratio. Namely under the condition of the confining pressure is constant, the silt in vibration under circulating load damage (liquid) the required shear stress (dynamic stress) with the increase of consolidation ratio increasing, vibration damage, but at the same time, the consolidation ratio, the greater the damage the shear stress is larger; Alsoavailable:under the same dynamic stress level, the consolidation ratio, the greater the vibration damage to the required time, the more and the conclusions are theoretically analyzed. Select test the parameters of the saturated silt obtained by using finite difference software FLAC3D to simulate the change of the soil in the process of pile driving.