CN1563923A - Long term porosity water pressure measuring method under action of dynamic loading - Google Patents
Long term porosity water pressure measuring method under action of dynamic loading Download PDFInfo
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- CN1563923A CN1563923A CN 200410030731 CN200410030731A CN1563923A CN 1563923 A CN1563923 A CN 1563923A CN 200410030731 CN200410030731 CN 200410030731 CN 200410030731 A CN200410030731 A CN 200410030731A CN 1563923 A CN1563923 A CN 1563923A
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- water pressure
- pore water
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- conduit
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Abstract
The method includes following steps: (1) inearthing a guide tube in proper length in soil layer, where pore water pressure is to be measured; (2) filling liquid into guide tube; (3) connecting pressure sensor to other end of guide tube. The guide tube attenuates earlier pressure peak greatly. Thus, pressure sensor in small range is possibly adopted to measure out procedure of changing pore water pressure with accuracy.
Description
Technical field
The present invention relates to a kind of under dynamic load effect the measuring method of long-term pore water pressure.
Background technology
No matter be in scientific research or the actual engineering, long-term pore water pressure force measurement all is indispensable, especially under dynamic load effect (as shock load, blast load etc.), and long-term pore water pressure relates to the key factor of engineering safety especially.
Because long-term pore water pressure is smaller,, must select the pressure transducer of little range, but under the dynamic load effect condition, the high pressure at initial stage will be damaged sensor in order to guarantee precision.During geotechnique and water conservancy project are measured at present, generally all be to adopt " intubation " (as shown in Figure 2) to measure long-term pore water pressure.When " intubation " measured under the dynamic load effect long-term pore water pressure, pore water pressure can diminish and lag behind.This all is because in " intubation ", and the size of pore water pressure is to measure by the rising of water level in the glass intubate and decline.When pore water pressure changed, the water level in the glass intubate 31 will rise and descend, and the additional of water source is to be supplied with by the water in the soil body or the saturated sand.Because the initial stage of dynamic load effect, pore water pressure reaches maximal value, and this supplies with regard to the water that needs the soil body or saturated sand interior 32, because the hysteresis of supplying with, the pore water pressure that measures will be littler than reality.Long-term pore water pressure under " intubation " dynamic load effect of measuring will diminish and lag behind like this.Under shock load or Explosion Loading, the pore water pressure in early stage is generally the magnitude of Mpa, and the time of process millisecond magnitude, pressure has promptly dropped to the magnitude (as shown in Figure 1) of Kpa, and this has just made difficulty for we select sensor to measure long-term pore water pressure.
Summary of the invention
Problem at prior art exists the object of the present invention is to provide the pressure peak at a kind of initial stage of decaying, and can measure the measuring method of long-term pore water pressure change procedure under the dynamic load effect exactly.
To achieve these goals, the present invention includes following steps:
A) end with a conduit of suitably growing buries in the soil layer that is placed on pore water pressure to be measured;
B) with full of liquid in this conduit;
C) other end with this conduit connects the upward pressure sensor.
Further, described conduit is the duroplasts conduit.
Further, described liquid is the liquid identical with the water body of measured pore water.
Therefore the present invention can attenuate the pressure peak at initial stage widely, and adopt the pressure transducer of little range owing to adopted conduit, just can measure the change procedure of long-term pore water pressure exactly.
Description of drawings
Fig. 1 is for directly measuring the trend curve figure of pore water pressure with the wide range pressure transducer;
Fig. 2 is the principle and the structural representation of " intubation ";
Fig. 3 is the synoptic diagram of the specific embodiment of the present invention;
Fig. 4 measures the trend curve figure of pore water pressure for the specific embodiment of the invention.
Embodiment:
As shown in Figure 3, an end of a duroplasts conduit 2 of suitably growing is installed woven wire 1, bury then in the soil layer that is placed on pore water pressure to be measured, and will be full of the liquid identical in the duroplasts conduit 2 with the pore water water body; By X-over 3 other end of this duroplasts conduit 2 is connected the pressure transducer 4 of a little range, connect a strain amplifier 5 at the other end of pressure transducer 4.Under shock load or Explosion Loading, the initial stage of pore water pressure behind dynamic load effect of an end that links to each other with duroplasts conduit 2 is very high, this pressure transmits the big high attenuation in back through duroplasts conduit 2, just can measure the change procedure of long-term pore water pressure exactly with the pressure transducer 4 of little range.Fig. 4 is the trend curve figure of measurement result, and the pressure peak of the millisecond magnitude in early stage has been attenuated, and the pore water pressure change procedure of long-term minute magnitude is then measured exactly.
Generally, adopt 2～4 meters long duroplasts conduit just can satisfy requirement of the present invention.
Claims (3)
1, the measuring method of long-term pore water pressure under a kind of dynamic load effect is characterized in that comprising the steps:
A) end with a conduit of suitably growing buries in the soil layer that is placed on pore water pressure to be measured;
B) with full of liquid in this conduit;
C) other end with this conduit connects the upward pressure sensor.
2, the measuring method of long-term pore water pressure under the dynamic load effect according to claim 1 is characterized in that, described conduit is the duroplasts conduit.
3, the measuring method of long-term pore water pressure under the dynamic load effect according to claim 1 is characterized in that, described liquid is the liquid identical with the water body of measured pore water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410030731 CN1563923A (en) | 2004-04-01 | 2004-04-01 | Long term porosity water pressure measuring method under action of dynamic loading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410030731 CN1563923A (en) | 2004-04-01 | 2004-04-01 | Long term porosity water pressure measuring method under action of dynamic loading |
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| Publication Number | Publication Date |
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| CN1563923A true CN1563923A (en) | 2005-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 200410030731 Pending CN1563923A (en) | 2004-04-01 | 2004-04-01 | Long term porosity water pressure measuring method under action of dynamic loading |
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| CN (1) | CN1563923A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603331A (en) * | 2013-11-21 | 2014-02-26 | 江苏省交通科学研究院股份有限公司 | Pit inflow point static waterhead height measuring device |
| CN104020096A (en) * | 2014-06-20 | 2014-09-03 | 青岛理工大学 | Device and method for detecting pore pressure by U-shaped pipe hydraulic differential rope method |
| CN105928656A (en) * | 2016-04-19 | 2016-09-07 | 西安交通大学 | Shock wave shape reconstruction method and system in water |
-
2004
- 2004-04-01 CN CN 200410030731 patent/CN1563923A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603331A (en) * | 2013-11-21 | 2014-02-26 | 江苏省交通科学研究院股份有限公司 | Pit inflow point static waterhead height measuring device |
| CN103603331B (en) * | 2013-11-21 | 2016-05-18 | 苏交科集团股份有限公司 | Foundation ditch issue stationary water grease head highness measuring instrument |
| CN104020096A (en) * | 2014-06-20 | 2014-09-03 | 青岛理工大学 | Device and method for detecting pore pressure by U-shaped pipe hydraulic differential rope method |
| CN104020096B (en) * | 2014-06-20 | 2016-04-27 | 青岛理工大学 | Device and method for detecting pore pressure by U-shaped pipe hydraulic differential rope method |
| CN105928656A (en) * | 2016-04-19 | 2016-09-07 | 西安交通大学 | Shock wave shape reconstruction method and system in water |
| CN105928656B (en) * | 2016-04-19 | 2018-06-26 | 西安交通大学 | A kind of underwater shock wave waveform reconstruction method and system |
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