Method for predicting safety of pile body of hammered pile body in granite area

Abstract

The invention relates to a method for predicting the safety of a hammered pile body in a granite area, which can predict the safety of the pile body in the granite area and prevent the pile body from being damaged, and is characterized by comprising the following steps of: firstly, determining the weight and the maximum stroke of a diesel hammer, and detecting the diameter and the top surface burial depth of a boulder by a geological radar or cross-hole earthquake CT method; determining the radius of the precast pile, the axial compressive strength design value of pile body concrete, the compressive bearing capacity limit value of the pile body, the elastic modulus and Poisson's ratio of granite residual soil, the shear modulus of the granite residual soil and the instantaneous maximum impact force borne by the top surface of the precast pile; then determining the soil body side frictional resistance borne by a pile body, determining the soil body side frictional resistance borne by the pile body, the dynamic cohesive force of granite residual soil and the weight of the granite residual soil, finally determining the resistance of the soil body at the lower part of the boulder, and judging whether the pile body is damaged or not by comparing the instantaneous maximum impact force with the resistance. The purpose of preventing the pile body from being damaged in advance is achieved.

Description

technical field [0001] The invention relates to the field of infrastructure construction, in particular to a method for predicting the safety of a hammer pile body in a granite area. Background technique [0002] A certain number of boulders are often distributed in the weathered residual soil area of ​​granite. When hammering piles in this area, the pile tip may be driven directly above the boulders, resulting in the failure of the prefabricated pile to be driven to the design depth smoothly. If the size of the boulder is large, the prefabricated pile cannot sink under the action of hammering power, and the pile body may be damaged. For the granite weathered residual soil area, the safety judgment of the prefabricated pile body is mostly based on engineering experience, and there is no relevant theoretical method for guidance. Contents of the invention [0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to...

AI Technical Summary

Problems solved by technology

[0002] A certain number of boulders are often distributed in the weathered residual soil area of ​​granite. When hammering piles in this area, the pile tip may be driven directly above the boulders, resulting in the failure of prefabricated piles to be driven to the design depth smoothly.

If the size of the boulder is large, the prefabricated pile cannot sink under the action of hammering force, and the pile body may be damaged

For granite weathering residual soil areas, the safety judgment of prefabricated piles is mostly based on engineering experience, and there is no relevant theoretical method for guidance

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