A kind of freezing force measuring test device and its measuring method

Abstract

The invention belongs to the field of underground engineering, and in particular relates to a test device for measuring the freezing force of the contact surface between an underground structure and frozen soil in a natural frozen soil area and an artificial frozen soil reinforcement area and a measurement method thereof. The hydraulic soil sample press presses the soil sample to make the density uniform. The hollow layer of the three-layer plexiglass constant temperature and heat preservation cover is filled with refrigerant and foam material to keep the temperature and heat preservation of the frozen soil. The outer wall of the steel pipe model pile is turned horizontally and circularly at different depths Dents simulate structures with different roughness. Thermocouple temperature sensors are embedded at different heights and directions on the side walls of steel pipe model piles to accurately measure the temperature of the pile-soil contact surface. Thermocouple temperature sensors, pressure sensors, and vertical displacement sensors are connected to digital acquisition. The instrument simultaneously measures the temperature of the pile-soil contact surface, the vertical load of the pile top and the relative displacement of the pile and soil. The freezing force measurement test device of the present invention has simple structure, stable and reliable performance, wide application range, and can accurately measure the freezing force and freezing strength of frozen soil at different temperatures and structures with different roughnesses.

Description

technical field [0001] The invention belongs to the field of underground engineering, in particular to a test device for measuring the freezing force of the contact surface between an underground structure and frozen soil in a natural frozen soil area and an artificial frozen soil reinforcement area and a measurement method thereof, which is suitable for measuring frozen soil under different freezing temperature conditions The freezing force and freezing strength of the contact surface with different roughness structures. Background technique [0002] There is a freezing force between the contact surface between the underground structure and the permafrost in the natural frozen soil area and the artificial frozen soil reinforcement area. The existence of this freezing force can easily cause the stress field of the underground structure to redistribute. Therefore, it is necessary to accurately measure the freezing force of the contact surface between the underground structure...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the present invention provides a freezing force measuring test device and its measuring method, which solves the problems in the prior art that the freezing force measuring device has a large test random error, inaccurate measurement results, and difficult operation of the measuring test.

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