Static and dynamic comprehensive test system considering soil expansion and contraction characteristics under temperature gradient

Abstract

The invention discloses a static and dynamic comprehensive test system considering soil expansion and contraction characteristics under temperature gradient. A temperature controlled circulating cavity at the upper end of a sample is used for carrying out low temperature freezing and warming thawing on the sample, so as to simulate the phenomenon of frost heave and thawing settlement in combination with actual implementation; the humidity change of the sample is accurately controlled by means of vapor, so as to better simulate the phenomenon of dry shrinkage and wet expansion in actual engineering; an electron microscope which can freely rotate and go up and down is designed to omnidirectionally scan the side of the sample, and is used for assisting in observing the changes of the internalstructure of the sample caused by the change of an external environment and provide theoretical support for the analysis of the change of physical and mechanical properties; a creative design of a double-layer silicone oil ring is proposed to improve the test accuracy, so as to obtain effective expansion force; in addition, optical fiber is arranged on the side wall of the sample to monitor temperature accurately, and in combination with a local strain sensor on the outer side of the sample, the overall strain of the sample is monitored comprehensively; the practical value and promotion valueof the static and dynamic comprehensive test system are high, and is of great significance for indoor simulation of freeze thawing and expansion and contraction of expansive soil and monitoring on changes of various indicators.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and specifically relates to a static and dynamic comprehensive test system considering the expansion and contraction characteristics of soil under a temperature gradient, which is applied to the indoor simulation of freezing and thawing and expansion and contraction of expansive soil to monitor the changes of various indicators. Background technique [0002] my country is a country where expansive soil is widely distributed, and the expansion or contraction of expansive soil can bring serious harm to engineering construction. At the same time, permafrost areas are widely distributed in my country, and the problem of permafrost diseases is prominent, which has seriously affected the speed of infrastructure construction and regional development in permafrost areas in my country. A reasonable model urgently needs the support of experimental technical conditions. [0003] The invention patent ...

AI Technical Summary

Problems solved by technology

However, the existing test instruments are still lacking in test accuracy, application range and practicability. It is urgent to propose a static and dynamic frost heave-expansion test system using an open system to carry out dynamic tests of soil under various dynamic loads. Experimental research on response and dynamic characteristics, in

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