Large-diameter pipe pile centrifugal test model making equipment and its working method

Abstract

The invention provides large-diameter tubular pile centrifugal test model manufacturing equipment and a working method thereof. The equipment comprises a device for cutting and scraping a soil samplein a model box, a guide hole soil taking device and a pile pressing backfilling device. The large-diameter tubular pile centrifugal test model manufacturing equipment is characterized in that the guide hole soil taking device adopts the following structure that thin-wall lead hole soil taking pipes are arranged, and the positions of the thin-wall guide hole soil taking pipes are limited by guide hole limiting rings and guide hole guides; the upper ends of the thin-wall guide hole soil taking pipes are connected with a vacuum pump through an adapter and a vacuum suction nozzle; the guide hole soil taking device is further provided with ventilation thin pipes which can be inserted into the thin-wall guide hole soil taking pipes, and the positions of the ventilating thin pipes are limited bythin pipe limiting rings, and an arc-shaped cutting piece is vertically fixed at the lower end of the ventilation thin pipes; and the upper ends of the ventilation thin pipes are connected with the vacuum pump through the vacuum suction nozzle. The large-diameter tubular pile centrifugal test model manufacturing equipment can complete soil sample scraping, guide hole soil sampling, pile insertingand backfilling operations under the condition of the minimum disturbance foundation soil under a normal gravity field, pile soil contact similarity simulation is completed after the high-gravity-field pre-consolidation is carried out, and the large-diameter tubular pile centrifugal test model manufacturing equipment is particularly suitable for a centrifugal test of a large-diameter pipe pile ofa saturated soft clay foundation.

Description

technical field [0001] The invention relates to the field of geotechnical centrifugal model tests, in particular to a large-diameter pipe pile centrifugal test model manufacturing equipment. The invention also relates to the method of operation of such a model-making device. Background technique [0002] The geotechnical centrifugal model test uses the high-speed rotation of the centrifuge to create a stress field for the model with the same stress level as the prototype, so that the properties of the prototype can be reproduced in the model, making it possible to simulate dozens of meters under a high gravity field with a model within a height of one meter Even hundreds of meters of prototype conditions. Geotechnical centrifugal model test technology, as the most effective physical model test method, involves almost all fields of civil engineering, and has become one of the most advanced and main research methods in the research of geotechnical engineering technology with ...

AI Technical Summary

Problems solved by technology

In principle, the pile forming process should be carried out in the high gravity field environment where the centrifuge is running, but the cost of pile formation in the centrifugal test model of large-diameter pipe piles in the high-gravity field is very expensive, and there is no report at present; the existing large-diameter pipe piles The piling operation of the centrifugal model is done manually under the condition of 1 g gravity

[0005] However, the geometric fabrication error and operation mode of the centrifuge model in the constant gravity field will be magnified by several orders of magnitude in the high gravity field

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