Frozen soil upper limit change rule testing method

Abstract

The invention discloses a frozen soil upper limit change rule testing method. A frozen soil upper limit change rule testing device comprises an outer tank body, an inner tank body, a data collection model and a system control and data collection computer, wherein the inner tank body is located at the inner part of the outer tank body; an outer tank cover and an inner tank cover are respectively arranged on the upper ends of the outer tank body and the inner tank body; a heating module and a refrigerating module are arranged in a position between the outer wall of the left side of the inner tank body and the inner wall of the outer tank body; the heating module and the refrigerating module are respectively communicated with the inner tank body. The invention relates to the technical field of geotechnical testing and measuring. A monitoring sensor buried in a soil sample can be used for monitoring the soil sample temperature change and a moisture migration situation during frozen soil freeze thawing, initial conditions and boundary conditions of a soil temperature conduction and moisture conduction differential equation can be determined according to measured data of the monitoring sensor, analytic solution can be solved according to a variable separation method, an upper limit position change rule can be obtained by combining temperature and moisture judgment criterion and substituting the analytic solution into an analytic solution formula, testing is controlled by a computer system, and a testing result is more accurate.

Description

technical field [0001] The invention relates to the technical field of geotechnical testing and measurement, in particular to a method for testing the variation law of the upper limit of frozen soil. Background technique [0002] According to statistics, 70% of the global land area has frozen soil, of which 14% is permafrost and 56% is seasonal frozen soil; my country is the third largest country in the world with permafrost, and the distribution area of ​​permafrost is 2.068×10 6 km 2 , accounting for 21.5% of my country's land area, the distribution area of ​​seasonal frozen soil is very wide, which is 5.137×10 6 km 2 , accounting for 53.5% of my country's land area, and the two together account for about 3 / 4 of the country's total area. The upper limit change of the permafrost subgrade is mainly caused by repeated freezing and thawing of the soil due to temperature changes, and the freezing and thawing of soil is a very It is a complex process, which is accompanied by p...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for testing the change law of the upper limit of permafrost, which solves the problem of determining the position of the upper limit of permafrost and its change law

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