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Dynamic pore water pressure measuring method

A technology of pore water pressure and measurement method, which is used in elastic deformation meter-type fluid pressure measurement, field foundation soil survey, construction, etc., and can solve problems such as pressure change lag, beheading, and lag effect.

Inactive Publication Date: 2005-01-05
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

This method can be used to measure the quasi-static pore water pressure, but when it is used to measure the dynamic pore water pressure, there are two disadvantages: one is the hysteresis effect, that is, the measured pore water pressure change lags behind the actual pressure change; The second is the "beheading" effect, that is, the measured pressure peak value is far lower than the actual pressure peak value, and the higher the rate of pressure change, the stronger this effect will be

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Embodiment Construction

[0009] like figure 1 As shown, the first structure of the sensor used in the present invention includes a pressure sensor 1 and an end cap 2 . The pressure sensor is a commercially available common sensor, such as a BPR type pressure sensor. The end cover 2 is made of metal, and a plurality of through holes 21 are processed on it. The end cover 2 is fastened on one end of the sensing probe 11 of the pressure sensor in a screw connection manner. Figure 12 shows the pressure sensor terminals.

[0010] When in use, put the sensor into the soil to be tested, the pore water in the soil fills the gap 3 between the end cover 2 and the sensing probe 11 through the hole 21, and the skeleton stress generated by the soil, sand and stone around the sensor acts on the sensor. On the end cover 2, the small holes 21 block the sediment out while allowing the pore water to pass smoothly. When the pore water in the void 3 and the pore water in the surrounding soil reach a balance, ensuring ...

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Abstract

The invention discloses a moving aperture water pressure measuring method, the method uses the normal pressure sensor as the basic measuring component, a sealing cover made up of hard material are arranged on the pressure sensor, the sealing cover buckles the sensing detector mangle of the pressure sensor into a space, the space is connected to exterior through several aperture with proper diameter arranged on the sealing cover, the pressure sensor with sealing cover is put into the soil to be measured, when the aperture water in the soil fills up the space containing the sensing detector, the measurement can be carried on, the water in the space also can be filled manually. The invention can be applied to research work of sand and soil dynamic mechanics in lab, detection of aperture water pressure in road base, detection of underground water level and so on.

Description

technical field [0001] The invention relates to a method for measuring dynamic pore water pressure. Background technique [0002] Whether it is scientific research or practical engineering, the measurement of pore water pressure is indispensable. Especially under the action of dynamic loads (such as earthquakes, blasting, etc.), dynamic pore water pressure is an important factor related to engineering safety. [0003] At present, in geotechnical and hydraulic measurements, in order to avoid the influence of soil skeleton stress on the measurement results, the widely used method is to add permeable stones to the front end of traditional pressure sensors. This method can be used when it is used to measure quasi-static pore water pressure. When it is used for dynamic pore water pressure measurement, it has two shortcomings: one is the hysteresis effect, that is, the measured pore water pressure changes lag behind the actual pressure change; The second is the "decapitation" ef...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/00G01L7/02
Inventor 张均锋孟祥跃
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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