Test device and test method for simulating soil mass column hole expansion

Abstract

The invention discloses a test device and a test method for simulating soil mass column hole expansion. The test device comprises a model box, a door type bracket, a soil compacting device, a high-speed video camera, a confining pressure device and a data acquisition device, wherein the model box is of a rectangular parallelepiped structure, one short edge side surface thereof is made of a tempered glass plate, the high-speed video camera directly faces the transparent glass surface, the door type bracket is erected on two sides of the model box in the short edge direction, and the soil compacting device comprises a roller shaft assembly, a hanging cloth, a crank handle and a cover plate; and the confining pressure device is arranged on the other side corresponding to the transparent glassof the model box, and comprises an air bag, a loading plate, a partition plate and a vacuum pump; and the data acquisition device comprises a load cell, a pore water pressure gauge and an earth pressure box. The test device and the test method realize the synchronous dynamic test of the soil compacting effect, and overcome the deficiency that the prior art can only study the soil mass column holeexpansion through theoretical analysis.

Description

technical field [0001] The invention relates to a test device and a test method for simulating the expansion of soil column holes, belonging to the technical field of geotechnical engineering. Background technique [0002] The small hole expansion theory originates from the problem that an elastic infinite body is subjected to uniform pressure, and mainly studies the stress, pore water pressure and displacement changes caused by the expansion and contraction of cylindrical or spherical holes. Because the small hole expansion theory provides many simple and practical methods to solve complex geotechnical problems, it has been widely used in the field of geotechnical engineering, such as in-situ lateral pressure test, tunnel excavation, bolt support, wellbore pile sinking and pile bearing capacity. Although a large number of analytical and numerical analyzes have been carried out on the theory of small hole expansion based on various constitutive models of rock and soil, the ...

AI Technical Summary

Problems solved by technology

However, during the process of expansion and extrusion, the soil often undergoes disturbance, remodeling, structural damage or excess pore water pressure, and the properties of the soil will change. In addition, pure theoretical analysis is difficult to solve complex stratum conditions.

Images