Rock mass ice-containing crack network frost heaving expansion process monitoring test system and method

Abstract

The invention provides a rock mass ice-containing crack network frost heaving expansion process monitoring test system and method, which belong to the technical field of geotechnical mechanics. The system comprises a true triaxial loading device, a temperature control acquisition system, a frost heaving force acquisition control system and an acoustic emission acquisition system. The true triaxialloading device is positioned in a freezing and thawing environment box body and is fixed by a self-locking device. The temperature control acquisition system is located on the right side of the freezing and thawing environment box body, and the whole temperature system is monitored by a temperature sensor in the box body. The frost heaving force acquisition control system converts signals received by the pressure sensor into electric signals through a frost heaving force measurement sensor installed in a crack of a rock test piece and transmits the electric signals to the computer terminal for analysis. The acoustic emission acquisition system collects an acoustic signal of rock mass fracture through an acoustic emission probe and transmits the acoustic signal to the terminal control system. According to the method, the expansion process and damage condition of the ice crack in the low-temperature rock mass can be quickly and accurately reflected, the rock mass fracture range is accurately positioned, and reference is provided for rock mass engineering construction in the cold region.

Description

technical field

[0001] The invention relates to the technical field of rock and soil mechanics, in particular to a monitoring test system and method for the frost heave expansion process of a rock mass ice-containing crack network. Background technique

[0002] Freeze-thaw damage and failure of low-temperature fractured rock mass has always been a key scientific issue in rock mass engineering construction in cold regions. The construction of rock mass engineering in cold regions, the low-temperature storage of underground liquefied petroleum gas, and the protection of ancient architectural relics all involve the problem of freeze-thaw damage to rock mass. For cracked rock mass, the temperature stress under freeze-thaw cycles and the water-ice phase transition Frost heaving force repeatedly stretches the tip of the crack, which will cause the crack to expand and penetrate, thus causing the surrounding rock to fracture, which poses a great threat to the stability of the low-te...

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