Model test device for researching pile-soil combined action and test method thereof

Abstract

The invention discloses a model test device for researching pile-soil combined action and a test method thereof. The device comprises a model frame, a force transfer bracket, a micro soil pressure box, a guide pipe, a sleeve, a strain gauge, micro piles, a jack, a displacement dial indicator and a steel block. The model frame is filled with soil and compacted, and the micro piles are placed according to different pile intervals to realize a pile-soil interaction simulation test of different pile intervals; the micro soil pressure box and the strain gauge are arranged around the micro piles; the jack acts on the force transfer bracket and then acts on the soil; and the force transfer bracket converts a concentrated load generated by the jack into a uniformly distributed load, so that the thrust required by the test device is realized. A horizontal grading loading mode is used for pushing a slip mass to slide and damage along a preset sliding surface; the micro soil pressure box is used for measuring the soil pressure borne by the micro piles; and the strain gauge is used for monitoring mechanical deformation of the micro piles under the soil pressure.

Description

technical field [0001] The invention belongs to the technical field of rock and soil landslide testing, and in particular relates to a model test device and a test method for studying pile-soil interaction. Background technique [0002] Different from ordinary anti-slide piles, micro piles have small pile diameter, large slenderness ratio, and low bending stiffness, which are closer to the properties of flexible materials. Therefore, they often appear in the form of micro pile groups in actual engineering design and construction. At this time, in the process of anti-sliding, in addition to relying on its own bending resistance and shear resistance to resist the thrust of the landslide, the micro-pile will also produce a relatively complex pile-soil interaction with the surrounding rock and soil between the piles to bear part of the landslide. thrust. In theoretical calculation, the slope body is assumed to be an ideal material, but in practice, the slope body may not meet t...

AI Technical Summary

Problems solved by technology

[0003] In recent years, researchers at home and abroad have done many physical model tests, numerical simulation tests, and field tests on micro-pile. The research areas also include the bearing capacity of micro-pile, the "soil arch effect" and the calculation of the internal force of the pile body. However, most of the current experimental research on micro-pile is still focused on the bearing capacity of the micro-pile and the calculation theory of the internal force of the pile body, and there are still some deficiencies in the failure and deformation characteristics of the micro-pile and the reinforcement mechanism.

Images