Multifunctional frozen soil circulation single shear test device and test method

Abstract

The invention discloses a multifunctional frozen soil circulation single shear test device and test method. The device comprises a shear box system, a reaction frame system, a refrigeration temperature control system, a loading system, a sliding system and a data monitoring system. The shear box system comprises a shear box body, a top loading plate, a fixing pin and a limiting baffle. The shearing box body comprises an upper shearing box, a plurality of shearing stacking rings and a lower shearing assembly which are sequentially stacked from top to bottom. Mosquito-repellent incense-shaped liquid grooves are formed in the top loading plate and a bottom plate of the lower shearing assembly, so that the temperature of each part of the sample is more uniform; and an annular liquid groove isformed in the shearing stacked ring. An internal and external combined temperature control mode and external constant temperature control are adopted in the test process, the temperature of the upperposition, the middle position and the lower position inside are independently controlled by the three high-low temperature constant temperature circulating baths respectively, the temperature controlprecision is improved, and the accuracy of test results is enhanced. The device can be used for carrying out cyclic single shear tests on the problems of fully frozen soil, fully thawed soil, temperature gradient, freeze-thaw cycle, freeze-thaw interface and the like.

Description

technical field [0001] The invention relates to the technical field of frozen soil tests, in particular to a multifunctional frozen soil cycle single-shear test device and a test method. Background technique [0002] Frozen soil is a heterogeneous and anisotropic four-phase complex composed of solid soil particles, ice, liquid water and gas. Generally speaking, all kinds of soil and rocks with a temperature below 0°C and containing ice are called permafrost. Since the unfrozen water and ice in frozen soil are significantly affected by the ambient temperature, and thus exhibit strong temperature sensitivity and rheological properties, in indoor and outdoor experiments on frozen soil, the temperature control accuracy is the key factor that will lead to the success or failure of the test and affect the test. A key factor in the credibility of the results. [0003] For the frozen soil test, it takes longer than the general conventional test, and it is inevitable to experience ...

AI Technical Summary

Problems solved by technology

However, the direct shear test has been questioned because the shear plane is artificially limited, and there are problems such as uneven distribution of stress

Images