Bentonite two-way swelling force measuring instrument

Abstract

The invention discloses a bentonite two-way swelling force measuring instrument, which comprises a fixation bolt, lock nuts, a top cover, a load sensor, stand column screw rods, a toss cap, a press head, an upper piston rod, a pipe connector, a seal ring, an expansion bucket, a water-permeable pad, a heat insulation pad, a heating ring, a strain foil, a temperature sensor, a bentonite sample, a temperature compensation sheet, a lower piston rod, a locating pin, a base, support legs and a data acquisition system. Swelling deformation data is obtained through the data acquisition system, and axial and radial swelling force are measured. The method is safe and simple to operate, and can measure the swelling force of the bentonite sample under a seepage condition or under a thermal environment and seepage dual conditions; and through the high-precision load sensor and the data acquisition system, test process is integrated, and parameters of the axial swelling force and the radial swelling force of the bentonite sample can be accurately monitored or calculated, thereby ensuring very high test precision and result reliability, and providing scientific and reasonable reference for scientific research and engineering application.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a bentonite bidirectional expansion force measuring instrument. Background technique [0002] Bentonite, also known as bentonite, is a natural mineral, and my country's total reserves rank second in the world. Bentonite is mainly composed of montmorillonite, the content is generally more than 65%, and bentonite has a special chemical composition and crystal structure, so it has many unique properties such as swelling, good impermeability, and high adsorption. [0003] In recent years, people have paid more and more attention to bentonite's excellent water-absorbing expansion and waterproof and anti-seepage capabilities. Because of its extremely low permeability and high adsorption, bentonite has become an ideal buffer backfill material in nuclear waste disposal. material. Expansion force is the basic parameter to evaluate the expansibility of bentonite. In view of the special physical ...

AI Technical Summary

Problems solved by technology

Axial utilization By freely adjusting the indenter, the sample is fixed on the test device, avoiding the influence of oven heating on the pressure sensor, and the heating ring is used to centrally heat the sample where the sample is located, and at the same time inject water to expand the sample, and the indenter will The axial expansion force is transmitted to the pressure sensor; and for the determination of the radial expansion force, if the prefabricated sample is used, it cannot ensure that the bentonite sample is closely attached to the inner wall of the device, thereby affecting the test results; directly on the test device. In this way, it makes up for the shortcoming that the sample cannot be closely attached to the inner wall of the device, but the sensor cannot be placed on the inner wall of the device sleeve. Although the sensor can be placed on the inner wall of the sleeve by drilling, it can only measure a small area. The small expansion force cannot reflect the overall situation, and the range of the pressure sensor is not easy to control

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