Testing device and testing method for testing failure mechanism of contact surface between testing pile and grouting soil body

Abstract

The invention provides a testing device for testing a failure mechanism of a contact surface between a testing pile and a grouting soil body. The testing device comprises a loading device and a tubular pile model test box; the loading device comprises a reaction force frame and a loading mechanism, and the loading mechanism arranged on the reaction force frame provides pressure to the tubular pilemodel test box; the tubular pile model test box is mounted on the reaction force frame, and the loading mechanism is arranged on the inner side of the top of the reaction force frame; the tubular pile model test box is detachably arranged in the reaction force frame; the loading mechanism is located above a tubular pile model mounting position of the tubular pile model test box; a displacement detecting device used for detecting vertical movement positions of the tubular pile model is arranged on the inner side of the top of the reaction force frame. The invention also provides a testing method for testing the failure mechanism of the contact surface between the testing pile and the grouting soil body by the testing device. Through the structure and the steps, the testing device is convenient to mount and demount and movable; a pile foundation model test system with accurate loading ensures smooth operation of tests, wherein strength and rigidity of the pile foundation model test system meet the test requirements.

Description

technical field [0001] The invention belongs to the technical field of civil engineering test devices, and in particular relates to a test device and a method for testing the failure mechanism of the interface between a pile and a grouted soil body. Background technique [0002] Pile foundation is a common form of foundation for high-rise buildings, especially in soft soil areas. The post-grouting technology on the pile side can reduce the thickness of the pile tip sediment, improve the performance of the pile tip and the soil around the pile, and has a significant effect on improving the bearing capacity of the pile and reducing the settlement of the pile. The interaction between the pile and the grouted soil is One of the main factors to play to strengths. The study of the mechanical characteristics of the interface between the pile and the grouted soil is the basis for understanding the mechanical mechanism of the grouted pipe pile, and the study of the mechanical charac...

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Problems solved by technology

[0003] At present, there is still a lack of in-depth and systematic research on the shearing, dislocation, and disengagement of the pile and its surrounding grouted soil, such as discontinuous deformation and failure problems.

The main reason is that the contact interface between the pile and the soil is assumed to be the failure surface during the operation of the existing test equipment, and the deformation of the two materials is coordinated. shear strength, so that the shear failure surface occurs inside the soil

The design concept of the current model pile test equipment makes it less pertinent to this test, the accuracy is not high, the test results are relatively random, and the operation is cumbersome. It is not suitable for a large number of model pile tests, so there is a lack of sufficient test data. comparative analysis

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