Pore pressure measuring device and system

Abstract

The invention provides a pore pressure measuring device and a pore pressure measuring system, and belongs to the field of pore pressure measurement, the measuring device comprises a first shell, an inflation pressure stabilizing assembly, a first sensor, a second sensor and a data acquisition control module; a back pressure cabin is arranged in the first shell, and the inflation pressure stabilizing assembly is arranged in the back pressure cabin. The first sensor is arranged in the first shell and used for detecting the pressure in the back pressure cabin; the second sensor is used for detecting the pressure difference between the back pressure cabin and the outside; the data acquisition control module is used for calculating a corresponding pressure value and a pressure difference value;when the measuring device is in the higher measuring range, relatively high measurement resolution can be ensured; before installation, a pressure value can be estimated to adjust the pressure of theinflation pressure stabilizing assembly, so that the working pressure range in the back pressure cabin is adjusted, a backpressure pressure source is stabilized, the problem that effective pressure fluctuation is abnormal under the condition of high pore pressure is solved, and the measurement precision and the application capability of pore pressure measurement are effectively improved.

Description

technical field [0001] The invention relates to the field of pore pressure measurement, in particular to a pore pressure measurement device and a measurement system. Background technique [0002] Pore ​​pressure measurement is a method of measuring water pressure in soil and rock layers. The sensor is buried inside the soil, and the water infiltrated in the soil acts on the sensor to measure its pressure. It is often used for monitoring pore water in rock and soil bodies such as landslides and debris flows. , Deep hole pore pressure measurement is also used in the study of seismic activity, and pore water pressure is one of the frequently observed items in geotechnical engineering construction and research. [0003] The existing pore pressure measurement scheme is the same as the general water pressure measurement. The difference is that a permeable stone is installed at the water inlet of the sensor. The water permeability is close to the measured soil to isolate impurities...

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Problems solved by technology

[0005] The accuracy of the current pressure sensor is about 0.1% of the full scale. When the range of the sensor increases, its accuracy will decrease; for the hydrostatic pressure at a deeper buried depth, a pore pressure gauge with a larger range must be selected, resulting in measurement accuracy. Reduced, unable to measure the pressure signal with small changes

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