Magnetic rod similar to soil, shear test device and method based on magnetic rod similar to soil technology

Abstract

The invention provides a magnetic rod similar to soil and a shear test device and method based on the magnetic rod similar to soil technology, which can effectively simulate cohesive soil and obtain accurate and reliable test data. The shearing test device includes: a plurality of magnetic rods with magnetic surfaces and an elliptical cross-section; a shear box, which is used to accommodate the magnetic rod-like soil formed by a combination of multiple magnetic rods, including a matching lower shear box and The upper shear box; the pressure transmission plate, matched with the upper opening of the upper shear box, the cover is set in the upper opening of the upper shear box, and contacts with the upper surface of the magnetic rod similar to the soil, and applies the vertical load to the pressure head The pressure is transmitted to the magnetic rod similar to the soil; the active shear force application member is arranged on the outer surface of the lower shear box, and matches the shear force application head of the direct shear instrument, and is used to transmit the shear force actively applied by the shear pressure force head The magnetic bar is similar to the soil; and the shear force passive bearing member is arranged on the outer surface of the upper shear box, matched with the measuring head of the stress ring of the direct shear instrument, and transmits the shearing force to the measuring head.

Description

technical field [0001] The invention belongs to the field of similar model tests of geotechnical engineering, and in particular relates to a magnetic bar similar soil, a shear test device and method based on the magnetic bar similar soil technology. [0002] technical background [0003] In the field of similar model tests in geotechnical engineering, two-dimensional bar analog soil (analogical soil) is widely used to reveal the deformation and load transfer phenomena of soil behind embankments, cushion materials and retaining walls. rods, aluminum rods, wooden rods and glass rods etc. Since there is no bonding between ordinary bars, the current two-dimensional bar-like soil can only simulate the engineering properties of sandy soils, but cannot simulate cohesive soils. At the same time, the current similar soil technology generally adopts a circular cross-section. Due to the low coordination number (the average number of contact points of a single particle) of the circular ...

AI Technical Summary

Problems solved by technology

Since there is no bonding between ordinary bars, the current two-dimensional bar-like soil can only simulate the engineering characteristics of sandy soils, but cannot simulate cohesive soils

At the same time, the current similar soil technology generally adopts a circular cross-section. Due to the low coordination number (the average number of contact points of a single particle) of the circular cross-section bar section, the dilatancy is low, and the strength is generally low, which is different from that of real soil. There is a large difference in volume, which is easy to cause simulation distortion

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