Existing engineering pile bottom depth determination method based on parallel seismic inflexion-point method

Abstract

The invention provides an existing engineering pile bottom depth determination method based on a parallel seismic inflexion-point method in the field of civil engineering pile foundation construction quality inspection. Detection is carried out in an exploratory hole after the exploratory hole is drilled beside a pile, a time-depth signal diagram is generated according to different depth signals in the depth direction, an inflection point is determined in the time-depth signal diagram, and the pile bottom depth is obtained after the depth of the inflection point is modified through a inflection-point depth modifier formula. Through the method, the influence on wave form from an upper structure is avoided, the inspection is convenient, and the determination of position of the inflection point is simple and visual. Compared with the conventional parallel seismic method, by which the pile bottom depth is determined based on intersection of two lines, the parallel seismic inflexion-point method has a lower requirement on the depth of the drill hole, just 2-3 m deeper than a pile to be inspected, thereby reducing the requirement on the depth of the exploratory hole, saving cost, having better maneuverability for technical personnel without engineering experience, and better solving the current problem that the pile depth of an engineering pile is hard to determine.

Description

technical field [0001] The invention relates to a method in the field of civil engineering pile foundation engineering quality detection, in particular to a method for determining the pile bottom depth of existing engineering piles based on the side hole transmitted wave inflection point method. Background technique [0002] Existing engineering piles connected to the upper foundation and structure, re-inspection and evaluation in the use state, is still a difficult problem in pile foundation inspection. For old engineering structures, their design or construction records may be difficult to find. If it is necessary to increase the bearing capacity of the bridge pile foundation due to the presence of vehicles with a larger load, it is necessary to check whether the pile foundation is damaged after an earthquake, or under long-term scouring, the soil around the pile is washed away or becomes loose so that the pile foundation When the foundation bearing capacity is reduced, i...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the current existing engineering piles cannot effectively determine the pile bottom depth, the present invention proposes a method for determining the pile bottom depth of existing engineering piles based on the side hole transmitted wave inflection point method

Compared with the existing side-hole transmission wave intersection method and correction method, which are based on the intersection of two lines to determine the depth of the pile bottom, the side-hole transmission wave inflection point method has lower requirements for the depth of the hole, and has high precision. It is simple and intuitive to determine the position of the inflection point. It only needs to be more than 2-3m below the estimated pile bottom to be tested. It also has good operability for technicians without engineering experience, and it better solves the problem that it is difficult to determine the depth of the pile bottom for existing engineering piles.

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