Device for applying impact excitation inside soil layer of laboratory sand box

Abstract

The invention provides a device for applying impact excitation to the interior of a soil layer of a laboratory sand box. The device comprises a sleeve, a sleeve barrel, a drill bit, a hammer rod, a hammer body, a hammer head and a sensor. The sleeve barrel is mounted on top of the sleeve, the sleeve is used for providing an internal space; the drill bit is mounted at the bottom of the sleeve and used for assisting the device in drilling into soil. The hammer rod is installed in the sleeve barrel through a vertical bearing and used for moving up and down in the sleeve, the hammer body is fixedly installed at the lower end of the hammer rod and used for increasing the counterweight mass of a hammer, the hammer head is installed at the lowermost end of the hammer rod, located on the lower portion of the hammer body and used for applying hammering force, and the sensor is fixed to the hammer head and used for recording force signals. Underground deep impact excitation load can be applied in situ or in a laboratory environment, the depth of a vibration source and the force of the vibration source are controlled, and drilling is conducted through the device without the help of other machines or concrete retaining walls.

Description

technical field [0001] The invention relates to the technical field of sand box dynamics, in particular to a device for applying impact excitation inside a laboratory sand box soil layer. Background technique [0002] In recent years, the traffic environment has been widely concerned by people. It is an economical and effective method to solve the vibration of the traffic environment by installing vibration isolation structures in the path of wave propagation. The sandbox dynamics experiment is one of the important means to study the law of wave propagation in the soil. Generally, the vibration response is picked up by vibration devices such as hammers and sensors, and the law of vibration propagation in the soil is studied. [0003] The existing laboratory sand box dynamic excitation equipment has the following two types: (1) hand-held small force hammer; (2) mechanical drilling type drop hammer. The disadvantage of the first type of equipment is that the load is applied b...

AI Technical Summary

Problems solved by technology

The disadvantage of the first type of equipment is that the load is applied by manually swinging the hammer, the amplitude of the force cannot be guaranteed to be accurate, and it is easy to cause secondary hammering and artificial signal interference; the disadvantage of the second type of equipment is that it needs to be passed in advance Mechanical drilling, making concrete sleeves, is expensive, and the bottom of the hole is prone to water accumulation and soil collapse, which interferes with the accuracy of the experimental results

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