A hoop-type torsional vibration excitation device and its method for measuring pile parameters and solving corresponding virtual time-domain response curves

Abstract

The invention provides a hoop type torsional excitation device and a method for measuring pile parameters and solving a corresponding virtual time-domain response curve through the hoop type torsional excitation device. The device comprises an inner hoop, an outer hoop, roll balls, a roll ball locating hoop, a plurality of pile holding bolts and dowel bars. The roll ball locating hoop is arranged between the inner hoop and the outer hoop. The roll balls are embedded between an outer rolling groove of the inner hoop and an inner rolling groove of the outer hoop and are located by the roll ball locating hoop. The pile holding bolts are arranged on the inner hoop in a penetrating mode. The dowel bars are symmetrically and perpendicularly welded to the outer sides of tangent lines of the inner hoop. The two dowel bars extend out of two dowel bar position holes of the outer hoop correspondingly. A load measured by the device is converted into torque acting on a pile body. A corresponding impedance function is worked out by combining the obtained torque and the torsional tangential linear velocity of the pile body after elimination of the influence, and then the more accurate virtual time-domain response curve is obtained through a numerical analysis method. The influence of the additional dynamic load on the tangential linear velocity is reduced, and even eliminated. Data are more accurate, and performance analysis of the pile body is facilitated.

Description

technical field [0001] The invention relates to the field of foundation pile detection, in particular to a hoop-type torsional vibration excitation device and a method for measuring pile parameters and solving corresponding virtual time-domain response curves. Background technique [0002] Pile foundation is the most widely used foundation form in my country today, and has the following characteristics: ①The pile is supported on a hard or relatively hard bearing layer, and has a high vertical bearing capacity of a single pile or a group of piles; ②Pile foundation It has a large vertical single pile stiffness or group stiffness, and under the influence of its own weight or adjacent loads, it does not produce excessive uneven settlement; ③ With the huge lateral stiffness of a single pile or the lateral stiffness of The overall anti-overturning ability can resist the horizontal load and moment load caused by wind and earthquake; ④The pile body passes through the liquefiable soil ...

AI Technical Summary

Problems solved by technology

The excitation method in this method may impose an additional horizontal load on the pile body, causing interference to the test results, and this method cannot weaken or eliminate the additional vibration caused by additional dynamic loads such as one-way strong water flow, waves, and tides. influence, there are obvious defects

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