A sample preparation device and sample preparation method for simulating the natural formation process of frozen soil

Abstract

The invention discloses a device applied to preparation of samples for simulating natural formation process of frozen soil. The device comprises a temperature control system, a sample preparing system, a compaction system and a computer control system, wherein the temperature control system comprises a heat preservation box, a cold bath device and a circular refrigeration pipeline; the circular refrigeration pipeline comprises a cooling liquid conveying pipeline, a spiral refrigeration pipeline and a cooling liquid recycling pipeline which are sequentially communicated with one another; the sample preparing system comprises a sample preparing chamber and a sample preparing mold; the spiral refrigeration pipeline spirally surrounds around the peripheral surface of the sample preparing chamber; the compaction system comprises a loading bracket and a pressing head; the loading and compacting rate and the progress depth of the pressing head are controlled by the computer control system. The invention also provides a sample preparing method which is especially suitable for preparing frozen soil samples with different freezing rates and different freezing and compacting sequences in a normal-temperature laboratory by the sample preparing device; real and reliable samples are provided for test of study on influence caused by the freezing rates and compacting and freezing sequences on the mechanical strength characteristics of the soil.

Description

technical field [0001] The invention relates to a sample preparation device and a sample preparation method suitable for simulating the natural formation process of frozen soil, in particular to controlling the freezing rate of the prepared sample and selecting the two sample preparation operations of freezing and compaction according to needs. The sequence of the sample preparation device and different sample preparation methods to simulate the formation process of frozen soil under various natural working conditions. Background technique [0002] With the continuation of the western development strategy, infrastructure construction in seasonally frozen areas and even permafrost areas is constantly being carried out. In order to ensure the safety and economy of projects in this area, it is necessary to In-depth study of the mechanical strength characteristics of frozen soil. Triaxial compression test and unconfined compressive strength test are widely used in the study of ...

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Problems solved by technology

[0006] At present, referring to the relevant literature on frozen soil, the impact of freezing rate and freezing and compaction sequence on the mechanical properties of frozen soil has not been reported, and no one has mentioned the sample preparation device and sample preparation method considering these two factors

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