Freezing force determination test device and determination method thereof

Abstract

The invention belongs to the field of underground engineering, and particularly relates to a determination test device for freezing force of the contact surface between an underground structure in a natural frozen soil area and a manual frozen soil reinforcing area and frozen soil and a determination method of the freezing force determination test device. A soil sample is pressed by a hydraulic soil sample presser to be uniform in compactness, hollow layers of a three-layer organic glass constant temperature preservation cover are filled with refrigerants and foaming materials to achieve constant temperature preservation for frozen soil, right-angle pits with different depths are horizontally and annularly turned in the outer wall of a steel pipe model pile to simulate structures with different roughness degrees, thermocouple temperature sensors are embedded at different height and different direction positions on the side wall of the steel pipe model pile to accurately determine the pile and soil contact surface temperature, and the thermocouple temperature sensors, a pressure sensor and a vertical displacement sensor are connected with a digital collection instrument to synchronously determine the pile-soil contact surface temperature, the pile top vertical load and pile-soil relative displacement changes. The freezing force determination test device is simple in structure, stable and reliable in performance, wide in application range, and capable of accurately determining the freezing force and freezing strength between frozen soil at different temperatures and the structures with different roughness degrees.

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...

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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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