A seismic test device for karst pile foundation based on a small shaking table model

Abstract

The invention discloses a karst pile foundation anti-seismic testing test device based on a small-scale shaking table model, and belongs to the technical field of pile foundation anti-seismic testing. The pile foundation model of the seismic test device is embedded in the prefabricated roof, and the prefabricated roof is set on the top of the two supports, and similar materials are filled in the gap between the supports and the visual simulation box, and several strain gauges are evenly arranged On the upper surface and the lower surface of the prefabricated top plate; a displacement change marking pen is set in the simulation similar material, and a movable strip coordinate paper for recording the displacement change track is set on the front side panel of the visual simulation box, and the visual simulation The outer side of the box is provided with a winding device for driving the strip graph paper to move. The seismic test device of the present invention can truly simulate the bearing mechanism of prefabricated roof and karst pile foundation in the laboratory and the settlement of the overall structure in small earthquakes, obtain reasonable and reliable thickness of karst cave roof and pile diameter, and ensure karst pile foundation in actual engineering of stability.

Description

technical field [0001] The invention relates to the technical field of anti-seismic testing of pile foundations, in particular to a test device for anti-seismic testing of karst pile foundations based on a small-scale shaking table model. Background technique [0002] Due to the well-developed road network in our country, bridge piles may appear in the seismically active zone and above the karst cave in bridge engineering. Due to the limitation, it is difficult to obtain complete geological survey data of the entire project site. In actual engineering, there are often structures that are quite different from the geological survey report, which leads to unfavorable situations such as supplementary survey and detailed survey. Therefore, some scholars propose to simulate karst from indoor model tests. The load-bearing shape of the pile foundation and the load-bearing mechanism and failure law of the karst cave roof. In actual situations, in small earthquake centers, the settlem...

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Problems solved by technology

[0002] Due to the well-developed road network in our country, bridge piles may appear in the seismically active zone and above the karst cave in bridge engineering. Due to the limitation, it is difficult to obtain complete geological survey data of the entire project site. In actual engineering, there are often structures that are quite different from the geological survey report, which leads to unfavorable situations such as supplementary survey and detailed survey. Therefore, some scholars propose to simulate karst from indoor model tests. The load-bearing shape of the pile foundation and the load-bearing mechanism and failure law of the karst cave roof. In actual situations, in small earthquake centers, the settlement displacement of the karst pile foundation and the karst cave roof will also change, which seriously affects the stability of the karst pile foundation. The existing karst The pile foundation seismic test device can only be used to detect the stress change of the karst pile foundation and the roof of the karst cave during the earthquake, and cannot simultaneously detect the settlement displacement during the earthquake

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