Dynamic pore water pressure gauge calibration pressure chamber device and dynamic pore water pressure gauge calibration method

Abstract

A dynamic pore water pressure gauge calibration pressure chamber device of the present invention comprises a calibration pressure chamber body, an upper pressure chamber is arranged at the top of the calibration pressure chamber body, and a hollow gas distribution cavity is arranged inside the upper pressure chamber, corresponds to an upper port of the calibration pressure chamber body and is equipped with a plurality of air intake holes which are distributed in the gas distribution cavity evenly. The air intake holes are communicated with the interior of the calibration pressure chamber body, the upper pressure chamber is equipped with an air intake pipe communicated with the gas distribution cavity. A to-be-calibrated pore water pressure gauge in the calibration pressure chamber device does not swing greatly, thereby being able to improve the calibration accuracy of the pore water pressure gauge effectively, and effectively avoiding damaging the to-be-calibrated pore water pressure gauge. The present invention also relates to a dynamic pore water pressure gauge calibration method.

Description

technical field [0001] The invention relates to the technical field of dynamic verification of pore water pressure gauges, in particular to a dynamic pore water pressure meter verification pressure chamber device and verification method. Background technique [0002] Pore ​​water pressure refers to the pressure of water in the saturated soil pore medium, which is a positive pressure (gauge pressure) above atmospheric pressure. It is a key physical parameter used to determine the deformation and stability of foundations, geotechnical structures (dykes / dams / slopes / wharves), underground structures and marine foundations under the action of external disturbance loads. Pore ​​water pressure is further divided into static pore water pressure and super static pore water pressure. Among them, static pore water pressure: caused by the self-weight of groundwater in foundation soil, that is, the pore water pressure below the static groundwater is static pore water pressure; Excess sta...

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Problems solved by technology

[0006] It can be seen from the above test process that the compressed gas input by the gas pipeline in the prior art only directly acts on the pressure chamber through an outlet of the three-way valve, and the bottom of the pressure chamber is only filled with 3-5cm of water. When the air pressure is high, the air pressure in the pressure chamber will be unevenly distributed, which will cause the liquid level in the pressure chamber to vibrate, and the pore water pressure gauge will fluctuate greatly with the liquid level, which will affect the pore water pressure. The verification of the gauge is not accurate enough, and it will also affect the measurement accuracy of the pore water pressure gauge, and even damage the pore water pressure gauge

[0007] What needs to be emphasized is that currently there is only static pore water pressure gauge calibration pressure chamber device, but no dynamic pore water pressure gauge calibration pressure chamber device. The calibration of the pore water pressure gauge cannot be realized under dynamic pressure, and there are the following key problems: the stable conversion and uniform distribution between air pressure and water pressure cannot be achieved under the single-hole air inlet method

[0008] The absence of dynamic verification devices hinders the effective evaluation of site and geotechnical structure failure and damage in existing geotechnical engineering

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