A permafrost stratum shaft wall physical and mechanical parameter testing method

By building a shaft-surrounding rock structure model inside the test chamber and simulating the freeze-thaw environment using a freeze-thaw cycle refrigeration machine, the negative skin friction was calculated, solving the problem of obtaining the negative skin friction of the shaft wall in cold regions and realizing the rapid and accurate testing of the physical and mechanical parameters of the shaft wall.

CN116792080BActive Publication Date: 2026-07-24CHANGAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGAN UNIV
Filing Date
2023-06-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies make it difficult to quickly and accurately obtain the negative skin friction of shaft walls in permafrost strata in cold regions, which makes it difficult to understand the interaction law between the shaft wall and the surrounding rock.

Method used

Design a test chamber with a built-in vertical shaft-surrounding rock structure model. Combine it with a freeze-thaw cycle refrigeration machine to simulate the freeze-thaw environment. Calculate the negative skin friction resistance using temperature, melt-sink displacement, and pressure gauge data. Plot the negative skin friction resistance-time curve of the well wall to obtain the final negative skin friction resistance value of the well wall.

Benefits of technology

This method enables rapid and accurate acquisition of wellbore negative friction resistance indoors, overcoming the long-period obstacle of field testing, improving the accuracy and reliability of the testing method, and revealing the physical and mechanical changes of the wellbore.

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Abstract

The application discloses a kind of permafrost stratum shaft lining physical mechanics parameter test methods, including the steps of constructing permafrost stratum shaft lining physical mechanics parameter indoor test device, thawing subsidence test simulation, test data validity analysis, shaft lining negative friction value calculation etc..The application uses refrigeration system to simulate the thawing subsidence effect of surrounding rock after freeze-thaw cycle, verifies the rationality of test process according to stratum temperature-time and thawing subsidence displacement time-history curve, accurately measures the thawing subsidence displacement between shaft lining and frozen soil by means of settlement measuring instrument, converts negative friction measurement into average shear stress calculation formula, and finally determines the final shaft lining negative friction value through the negative friction-time time-history curve drawn, improves the accuracy and reliability of test method and result.
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