Dynamic pore water pressure measuring method
A technology of pore water pressure and measurement method, which can be used in elastic deformation meter-type fluid pressure measurement, on-site foundation soil survey, construction, etc.
Inactive Publication Date: 2006-03-08
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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[0014] Such as 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 cap 2 is made of metal and has several through holes 21 processed thereon. The end cap 2 is buckled on one end of the pressure sensor sensing probe 11 in a threaded connection. Figure 12 shows the pressure sensor terminals.
[0015] When in use, the sensor is put into the soil to be measured, the pore water in the soil fills the gap 3 between the end cover 2 and the sensing probe 11 through the hole 21, or the gap 3 is artificially filled with water, the soil around the sensor, The skeleton stress produced by sand and stone acts on the end cover 2, and the small holes 21 block the sediment outside while allowing the pore water to pass through smoothly. When the pore water in the void 3 is in balance with the pore water in th...
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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 load (such as earthquake, blasting, etc.), dynamic pore water pressure is an important factor related to engineering safety. [0003] At present, in geotechnical and hydraulic surveys, in order to avoid the influence of soil skeleton stress on the measurement results, a widely used method is to add permeable stones to the front of the traditional pressure sensor. 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...
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IPC IPC(8): G01L7/02E02D1/00
Inventor 张均锋孟祥跃
Owner INST OF MECHANICS CHINESE ACAD OF SCI