Undisturbed soil sample expansion force testing device capable of controlling saturation

Abstract

The invention discloses an undisturbed soil sample expansion force testing device capable of controlling the saturation. The device comprises a base supporting system, wherein a lower disc is fixed on the base supporting system, a cutting ring base and a cutting ring are arranged on the lower disc, and the upper part of the cutting ring base is provided with an upper cover; a central circular groove and an annular groove are formed on the lower disc, a soil pressure sensor is arranged in the central circular groove, an annular water penetration plate is arranged in the annular groove, water-immersion circular grooves are formed on the annular water penetration plate, water-permeable stones are uniformly placed in the water-immersion circular grooves, and the bottom of the annular groove is connected with an external water injection system through a pipeline; a soil sample is placed between the lower disc and the cutting ring, and a water-permeable plate base which is provided with a water-permeable plate and water-permeable holes is arranged on the top of the soil sample; and a plunger, overflow equipment and vacuum extraction equipment are arranged on the upper cover. The device effectively solves the problems that testing devices for an expansion back pressure method, a pressurization expansion method and a balance pressurization method have relatively large disturbance on soil sample structures, cannot effectively control strict saturation states and are relatively long in testing time consumption.

Description

technical field [0001] The invention belongs to the technical field of soil sample physical quantity test equipment, and in particular relates to a soil sample expansion force test device which can control saturation without disturbance. Background technique [0002] Geotechnical test is one of the basic contents of soil mechanics research. Geotechnical test can reveal the unique mechanical properties of soil, determine various theoretical and engineering design parameters, and at the same time verify the correctness and practicability of various theories. Therefore, the geotechnical test plays an irreplaceable role in the theoretical research and engineering application of soil mechanics. [0003] Because of the importance of the geotechnical test, the accuracy of the geotechnical test is valued. The accurate determination of soil sample parameters in soil engineering tests is more related to the correctness and feasibility of theoretical research. Therefore, the new test...

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Problems solved by technology

[0016] The purpose of the present invention is to provide a soil sample expansion force testing device that can control saturation without disturbance, which effectively overcomes the large disturbance to the soil sample structure in the test devices such as the expansion back pressure method, the pressurized expansion method and the balanced pressurization method. Can not effectively control the strict saturation state and the problem that the test takes a long time

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