RESEARCH ON THE EVOLUTION CHARACTERISTICS OF NEGATIVE FRICTIONAL RESISTANCE OF WEDGE-SHAPED PILES UNDER OVERLOAD
Analyzing the characteristics of negative frictional resistance caused by soil settlement around piles due to ground loading factors is of great theoretical significance for understanding and mastering the characteristics of negative frictional resistance of pile foundations.However,how to reduce the negative frictional resistance caused by loading is more practical for engineering.The study used FLAC 3D finite difference method to analyze the effect of pile loading on the negative friction and neutral point of wedge-shaped pile foundation.The research results showed that regardless of the size of pile loading,the axial force of the wedge-shaped pile body increased with the increase of depth.When it reached a certain peak,the axial force of the pile body decreased.When the soil pile load around the pile is not greater than 7.5kPa,the axial force also increases significantly with the increase of the pile load;When the soil pile load around the pile is greater than 7.5kPa,as the pile load increases,although the axial force also slightly increases,its growth rate is relatively small.The stable depth of the neutral point of the wedge-shaped pile under pile loading is between-0.3 and-0.4m.When the soil around the pile is heavily loaded,the neutral point position can be calculated using the maximum axial force point,zero frictional resistance value,and zero relative displacement value;When the pile load is small,it is more reliable to calculate the neutral point position using the maximum axial force point and the zero frictional resistance value.
wedge pilenegative friction resistanceneutral pointrelative displacementfinite element
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