Anti-seismic testing device for karst pile foundation based on minitype vibration platform model

Abstract

The invention discloses an anti-seismic testing device for a karst pile foundation based on a minitype vibration platform model, and belongs to the technical field of anti-seismic tests for pile foundations. A pile foundation model of the anti-seismic testing device is embedded in a prefabricated top plate, the prefabricated top plate is arranged on the tops of two supports, gaps between the supports and a visual simulation box are filled with a simulated similar material, and several strain devices are uniformly arranged on the upper surface and lower surface of the prefabricated top plate; adisplacement changing marking pen is arranged in the simulated similar material, movable striped coordinate paper used for recording a displacement changing track is arranged on a front-side panel ofthe visual simulation box, and a rolling device used for driving the striped coordinated paper to move is arranged on the outer side of the visual simulation box. The anti-seismic testing device canreally simulate the prefabricated top plate, the bearing principle of the karst pile foundation and sedimentation conditions of the whole structure of the karst pile foundation under the small earthquake condition in a laboratory to obtain the reasonable and reliable thickness of the top plate of a karst cave and the pile diameter, and the stability of the karst pile foundation in a practical project is ensured.

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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