Deep hole transfer function test system and test method thereof

Abstract

The invention discloses a deep hole transfer function test system. The system comprises a deep hole exciting device, a data acquisition instrument, a plurality of acceleration sensors which are evenly arranged on the ground, and a PC machine. The deep hole exciting device is connected with the data acquisition instrument. The acceleration sensors are connected with the data acquisition instrument. The data acquisition instrument is connected with the PC machine. The deep hole exciting device comprises a drop hammer bracket, a steel strand, a motor, a force hammer assembly and a steel sleeve. The drop hammer bracket is located on the ground. The motor is located on the drop hammer bracket. The steel strand is connected with the drop hammer bracket. An exciting hole is arranged in the formation. A concrete sleeve is arranged on the inner side of the exciting hole. The steel sleeve is arranged on the inner side of the concrete sleeve. The force hammer assembly is located in the steel sleeve. The force hammer assembly is connected with the motor through the steel strand. The invention further provides a test method of the deep hole transfer function test system. The system and the method have the advantages that pulse excitation can be carried out in a borehole of any depth in the formation; effective vibration excitation is generated; all signals are synchronously sampled; and any formation transfer function can be tested and calculated.

Description

technical field [0001] The invention relates to the technical field of vibration testing, in particular to a deep hole transfer function testing system and a testing method thereof. Background technique [0002] At present, there is no test system and technology for vibration prediction using the measured formation transfer function. The existing relatively similar test system is to measure the vibration acceleration of the tunnel wall and the vibration acceleration of the ground surface, and then calculate the transfer ratio of the two, so as to obtain the actual measurement. The transfer characteristics of the stratum are used for vibration prediction. This test system does not obtain the vibration transfer function. The prediction principle ignores the phase information of the vibration source excitation of the subway train running, and there is a systematic error, so the prediction accuracy is average. At the same time, in the test process of the measured transfer ratio ...

AI Technical Summary

Problems solved by technology

The device can be transported and moved, and placed on the track or inside the tunnel for impact excitation, which can only meet the excitation on the ballast bed and in the tunnel, and requires personnel to operate nearby. It is too large to be placed inside the borehole to meet the requirements for drilling Bottom Excitation Requirements

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