Rock-soil body freeze thawing-stress coupling creep test instrument and test method in water environment

Abstract

The invention discloses a rock-soil body freeze-thaw stress coupling creep test instrument and test method in a water environment. The test instrument comprises a hydraulic control system, a water pressure control system, a freeze-thaw circulating system, a temperature control system and a data acquisition system. A rock-soil body sample is placed in a pressure-bearing barrel of the triaxial creeptest device, confining pressure is applied to the rock-soil body sample through a water pressure control system, axial pressure is applied to the rock-soil body sample through a hydraulic control system, a freeze-thaw cycle system provides freeze-thaw cycle working conditions for the test through a refrigerating machine and a heating machine, and a temperature control system monitors and controlsthe temperature in the pressure-bearing barrel; after the axial pressure and the water pressure are stable, a rock-soil body sample triaxial creep test is carried out, and a data acquisition system acquires test data in the test process in real time. The invention also provides a rock-soil body freeze-thaw stress coupling creep test method in a water environment. According to the invention, the triaxial creep test of the rock-soil body is carried out in a freeze-thaw cycle environment, and the efficiency and precision of the test are effectively improved.

Description

technical field [0001] The invention relates to the technical field of rock-soil mechanics testing, specifically belongs to a rock-soil freeze-thaw-stress coupled creep test instrument and test method in a water environment, and is mainly used for testing the triaxial creep of rock-soil materials in a freeze-thaw cycle environment mechanical parameters. Background technique [0002] Freeze-thaw cycle is a common phenomenon in nature that has a degrading effect on rock and soil materials. It mainly occurs in glacier regions, alpine regions, and permafrost regions. There are pores inside the rock and soil materials, and the pores contain water. Under the continuous action of the freeze-thaw cycle, the pore water will freeze and melt continuously. This process will accelerate the chemical and physical erosion of the rock and soil materials by water, resulting in rock and soil The deterioration of the physical and mechanical properties of bulk materials is mainly manifested in ...

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Problems solved by technology

[0004] At present, some research results have been obtained in the research on the performance degradation of rock and soil materials under the action of freeze-thaw cycles, mainly relying on indoor simulation tests or numerical simulations, but there are few researches on the long-term strength of rock and soil materials under the coupling of freeze-thaw-stress, especially It is a study on the triaxial creep characteristics of rock and soil materials under freeze-thaw cycle conditions, and there is no public instrument and equipment available

There are two main problems in the existing freeze-thaw cycle test device: 1. During the freeze-thaw cycle process, the rock-soil material is separated from the original stress environment, causing the freezing and thawing effect of the rock-soil material to be inconsistent with the actual situation, which affects its mechanical properties. 2. The triaxial creep test of rock and soil materials cannot be directly carried out in the freeze-thaw cycle environment, and the triaxial creep process of rock and soil materials is directly related to the freeze-thaw cycle

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