CN102564676A - Penetrating-stretching type pore water pressure measurement device and measurement method thereof - Google Patents
Penetrating-stretching type pore water pressure measurement device and measurement method thereof Download PDFInfo
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- CN102564676A CN102564676A CN2012100303857A CN201210030385A CN102564676A CN 102564676 A CN102564676 A CN 102564676A CN 2012100303857 A CN2012100303857 A CN 2012100303857A CN 201210030385 A CN201210030385 A CN 201210030385A CN 102564676 A CN102564676 A CN 102564676A
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Abstract
The invention relates to a penetrating-stretching type pore water pressure measurement device and a measurement method thereof. A projecting segment of a taper penetration head is inserted into a filter pipe and is connected with the filter pipe through a screw thread or a pin. The filter pipe is externally provided with a sleeve pipe and is in sliding fit with the sleeve pipe. The sleeve pipe is tightly pressed on a shoulder of the sleeve pipe and the taper penetration head through a gasket. A bottom of a conduit is arranged on an upper end of the sleeve pipe through screw thread or nestification. According to the device and the method, problems that pore water pressure monitoring and measurement are complex and data is not direct in a saturated soft soil distribution region are solved, the device and the method are especially suitable for the pore water pressure monitoring and measurement of a fine grain soil layer with formation reasons of a fourth system river delta phase, an oxbow lake phase, a lake phase, a lagoon phase, a marsh phase and the like, measurement of a groundwater table, a perched water level and a confined water head of underground water, underground water monitoring, and water quality layered monitoring and sampling of an underground water environment. Compared with the prior art, the device has the advantages of simple structure, low cost, practicality and convenience, and the measurement method has the advantages of convenience, easy enforcement, convenient operation and reliable data.
Description
Technical field
The present invention relates to a kind of monitoring instrument, especially relate to a kind of direct-type measurement mechanism and measuring method of measuring soil layer mesoporosity water pressure.
Background technology
Engineering construction area of activities in full water weak soil distributive province often needs the dynamic change of monitoring soil body mesoporosity water pressure and underground water table.Like monitoring dam foundation pore water pressure when seasonable in the construction of building a dam of weak soil distributive province hydraulic engineering, decide construction speed according to the dynamic change of the pore water pressure of different time sections; House floor constructure engineering aspect especially the soft soil foundation layering build fill out or during excavation of foundation pit underground monitoring pore water pressure also be like this; Existing monitoring pore water pressure metering system method commonly used has two kinds, and a kind of is to be utilized in to bury pore water pressure sensor in the boring underground, and another kind is to bury piezometric tube underground.The former utilizes wired conduction pattern, and the pore water pressure sensor sense film deformation signal of popping one's head in is converted into the electric signal of resistance variations, gives the user with electrical signal transfer then; Defective is that the method is through indirect metering system; The data of being gathered receive many factor affecting, and variability is big, like the problem of aging of sensor; Expensive cost issues, the short-term that can only be suitable in priority project is used; The latter is that piezometric tube is buried in layering underground before engineering construction, and then measures pore water pressure with pore pressure gauge, and shortcoming is be difficult for to ensure that piezometric tube is provided with requirement, also directly affects the Monitoring Data result like the leakproofness of verticality, sealing quality and connectedness etc.
Summary of the invention
The object of the invention just is the deficiency to above-mentioned prior art, and a kind of injection-drawing pore water pressure force measuring device is provided;
Another object of the present invention provides the measuring method of a kind of injection-drawing pore water pressure force measuring device.
The objective of the invention is to realize through following technical scheme:
Injection-drawing pore water pressure force measuring device; Be that convex section by taper injection 4 inserts filter pipe 2; Be connected with filter pipe 2 through screw thread or pin, the filter pipe 2 outer sleeve pipes 3 that are equipped with, filter pipe 2 is slidingly matched with sleeve pipe 3; Sleeve pipe 3 is pressed on the shoulder with taper injection 4 through packing ring 5, and conduit 6 bottoms are through screw thread or be nested in sleeve pipe 3 upper ends and constitute.
The measuring method of a kind of injection-drawing pore water pressure force measuring device comprises following order and step:
Assemble injection-drawing pore water pressure force measuring device before a, the test earlier; The convex section of taper injection 4 is inserted filter pipe 2, be connected with filter pipe 2 through screw thread or pin, filter pipe 2 is surrounded by worry paper; Consider paper sleeve pipe 3 is housed outward; Filter pipe 2 is slidingly matched with sleeve pipe 3, and sleeve pipe 3 is pressed on the shoulder with taper injection 4 through packing ring 5, and conduit 6 bottoms are through screw thread or be nested in sleeve pipe 3 upper ends;
B, will assemble the good injection-drawing pore water pressure force measuring device of consumption, and utilize static(al) injection equipment or knocker to be driven into the projected depth of test beds;
C, conduit 6 is upwards promoted 100-200mm together with sleeve pipe 3, sleeve pipe 3 and taper injection 4 separates, and exposes filter pipe 2, and the test section soil layer is contacted with filter pipe 2, and the pore water in the test section soil layer infiltrates in the filter pipes 2 through infiltration hole 7;
D, infiltrated through 10-30 minute;
E, potential electrode is lowered in the water in the filter pipe 2, through infiltrating the lifting heights of pore waters in the underground water level measurement instrumentation amount filter pipe 2;
F, calculate test section pore water pressure value through the lifting heights that infiltrate pore waters in the filter pipe 2:
Formula: H=h
4-h
2=h
0-(L
3-L
2-h)-(h
1+ h/2)=L
1-L
3+ h/2,
σ＝γ
ω?H，
In the formula: h
0-test point elevation, h
1The elevation of-test section soil layer is h
2The elevation at the mid point h/2 place of-test section soil layer, h
3-pipe orifice crack height of water level is to the height on ground, h
4-pipe orifice crack water level elevation, L
1-catheter length, L
2-the catheter length that bassets, L
3-going deep into the conductor length usefulness in the conduit, the water column on the H-test section soil layer face is high, γ
ωThe unit weight of-water, σ-test section pore water pressure value;
G, measure the lifting height that infiltrates pore waters in the filter pipe 2 after, extract sleeve pipe 3 and conduit 6, taper injection head, filter pipe 2 and packing ring 5 discard.
Beneficial effect: the monitoring pore water pressure measuring complex that the invention solves full water weak soil distribution area; The roundabout problem of data; Be particularly useful for Quaternary system fluvial-delta phase, yoke lacustrine facies, lacustrine facies, lagoonal facies and marsh and equate the fine grained soil formation pore water pressure monitoring measurement of the origin cause of formation and the measurement of phreatic phreatic table, perched water level and piestic water head, the water quality hierarchical monitor and the sampling of groundwater monitoring and groundwater environment.Compared with prior art, apparatus structure is simple, and is with low cost, practical and convenient; The easy easy enforcement of its measuring method, easy to operate, data are reliable.
Description of drawings
Accompanying drawing 1 is injection-drawing pore water pressure force measuring device structural drawing
Accompanying drawing 3 is the cut-open view after Fig. 1 sleeve pipe 3 promotes
Accompanying drawing 4 is Fig. 1 pore water water column lifting height cut-open view
2 filter pipes, 3 sleeve pipes, 4 taper injection heads, 5 packing rings, 6 conduits, 7 infiltration holes
Embodiment:
Do further detailed description below in conjunction with accompanying drawing and embodiment:
Injection-drawing pore water pressure force measuring device comprises also comprising the underground water level measurement meter.Injection-drawing pore water pressure force measuring device bottom is taper injection 4; The convex section of taper injection 4 inserts filter pipe 2, is connected with filter pipe 2 through screw thread or pin, and filter pipe 2 is provided with treatment hole 7; Twine filter paper outward; On the shoulder of taper injection 4 packing ring 5 is housed, sleeve pipe 3 is pressed above that, and filter pipe 2 is slidingly matched with sleeve pipe 3.Sleeve pipe 3 bottoms freely contact with taper injection 4 circular bead surface; Be provided with annular seal packing ring 5 between the two; To guarantee in injection extrusion process, having reliable tightness; Stop non-test section underground water or seepage flow get in pipe, and can ensure when conduit 6 promotes with sleeve pipe 3 connectedness of separating back test section soil layer pore water infiltration filter pipe 2 with conical head injection 4.Earlier injection-drawing pore water pressure force measuring device is assembled before the test; Utilize static(al) injection equipment or knocker to squeeze on the projected depth that is pressed into test beds; Upwards promote conduit 6 about 100-200mm then; Make its together with outer layer sleeve 3 and taper injection 4 separate, let test section soil layer mesoporosity water infiltrate the internal layer filter pipe, promptly accomplish the setting that pore water pressure is measured.In the test, pore water pressure is measured and can be converted the pore water pressure value that obtains the test section soil layer with this at last through traditional millivolt amp gauge underground water level measurement method measuring guide inner pore rise waterborne.Concrete calculation procedure is following: find test point elevation h according to topomap
0, catheter length L
1Be known, the catheter length L that bassets
2Can measure, then be pressed into or the catheter length of being driven underground is L
1-L
2, the elevation that length can obtain the test section soil layer that is pressed into that uses the test point elevation to deduct conduit is h
1=h
0-(L
1-L
2), then conduit is upwards promoted about 100-200mm, be made as h, because of the pore water pressure value of test section h is approximately equal to the pore water pressure value at this section mid point h/2 place, promptly ask the pore water pressure value at test section soil layer mid point h/2 place.The elevation h at the mid point h/2 place of test section soil layer
2=h
1+ h/2=h
0-(L
1-L
2)+h/2; The conductor length that the conduit inner pore rise waterborne that millivolt amp gauge underground water level measurement method is measured promptly gos deep in the conduit to the used conductor length of catheter flange is used L
3Expression, pipe orifice crack height of water level is to the height h on ground
3=L
3-(L
2+ h), pipe orifice crack water level elevation h then
4=h
0-h
3=h
0-(L
3-L
2-h), test section pore water pressure value H=h then
4-h
2=h
0-(L
3-L
2-h)-(h
1+ h/2)=L
1-L
3+ h/2, σ=γ
ωH.
Injection-drawing pore water pressure force measuring device; Be that convex section by taper injection 4 inserts filter pipe 2; Be connected with filter pipe 2 through screw thread or pin, the filter pipe 2 outer sleeve pipes 3 that are equipped with, filter pipe 2 is slidingly matched with sleeve pipe 3; Sleeve pipe 3 is pressed on the shoulder with taper injection 4 through packing ring 5, and conduit 6 bottoms are through screw thread or be nested in sleeve pipe 3 upper ends and constitute.
The measuring method of a kind of injection-drawing pore water pressure force measuring device comprises following order and step:
Assemble injection-drawing pore water pressure force measuring device before a, the test earlier; The convex section of taper injection 4 is inserted filter pipe 2, be connected with filter pipe 2 through screw thread or pin, filter pipe 2 is surrounded by worry paper; Consider paper sleeve pipe 3 is housed outward; Filter pipe 2 is slidingly matched with sleeve pipe 3, and sleeve pipe 3 is pressed on the shoulder with taper injection 4 through packing ring 5, and conduit 6 bottoms are through screw thread or be nested in sleeve pipe 3 upper ends;
B, will assemble the good injection-drawing pore water pressure force measuring device of consumption, and utilize static(al) injection equipment or knocker to be driven into the projected depth of test beds;
C, conduit 6 is upwards promoted 100-200mm together with sleeve pipe 3, sleeve pipe 3 and taper injection 4 separates, and exposes filter pipe 2, and the test section soil layer is contacted with filter pipe 2, and the pore water in the test section soil layer infiltrates in the filter pipes 2 through infiltration hole 7;
D, infiltrated through 10-30 minute;
E, potential electrode is lowered in the water in the filter pipe 2, through infiltrating the lifting heights of pore waters in the underground water level measurement instrumentation amount filter pipe 2;
F, calculate test section pore water pressure value through the lifting heights that infiltrate pore waters in the filter pipe 2:
Formula: H=h
4-h
2=h
0-(L
3-L
2-h)-(h
1+ h/2)=L
1-L
3+ h/2,
σ＝γ
ωH，
In the formula: h
0-test point elevation, h
1The elevation of-test section soil layer is h
2The elevation at the mid point h/2 place of-test section soil layer, h
3-pipe orifice crack height of water level is to the height on ground, h
4-pipe orifice crack water level elevation, L
1-catheter length, L
2-the catheter length that bassets, L
3-going deep into the conductor length usefulness in the conduit, the water column on the H-test section soil layer face is high, γ
ωThe unit weight of-water, σ-test section pore water pressure value;
G, measure the lifting height that infiltrates pore waters in the filter pipe 2 after, extract sleeve pipe 3 and conduit 6, taper injection head, filter pipe 2 and packing ring 5 discard.
Embodiment 1
In the building site, Jilin, earlier taper injection 4 is connected with filter pipe 2 through pin, filter pipe 2 is a pvc pipe; Filter pipe 2 is outer to be tied with filter paper, again sleeve pipe 3 is sleeved on filter pipe 2 outsides, and sleeve pipe 3 is pressed on the shoulder with taper injection 4 through packing ring 5; Filter pipe 2 is slidingly matched with sleeve pipe 3, conduit 6 bottoms through be nested in sleeve pipe 3 above, the diameter 2.0cm of filter pipe 2; The diameter 1mm in the infiltration hole 7 on the filter pipe 2, the spacing 2cm in infiltration hole 7
The measuring method of injection-drawing pore water pressure force measuring device comprises following order and step:
The conduit 6 that earlier pore water pressure probe 1 is connected with top before a, the test utilizes static(al) injection equipment or knocker to be driven into the projected depth of test beds;
B, conduit 6 is upwards promoted 100mm together with sleeve pipe 3, sleeve pipe 3 and taper injection 4 separates, and exposes filter pipe 2, and the test section soil layer is contacted with filter pipe 2, and the pore water in the test section soil layer infiltrates in the filter pipes 2 through infiltration hole 7;
C, warp infiltrated in 30 minutes;
D, potential electrode is lowered in the water in the filter pipe 2, through infiltrating the lifting heights of pore waters in the underground water level measurement instrumentation amount filter pipe 2; Consulting topomap learns:
h
0-test point elevation ,=736m
h
1The elevation of-test section soil layer is=734.3m
h
2The elevation at the mid point h/2 place of-test section soil layer ,=734.35m
h
3-pipe orifice crack height of water level is to the height on ground ,=1.1m
h
4-pipe orifice crack water level elevation ,=734.9m
L
1-catheter length ,=2.2m
L
2-the catheter length that bassets ,=0.5m
L
3-go deep into the interior conductor length of conduit to use.＝1.7m
E, calculate test section pore water pressure value through the lifting heights that infiltrate pore waters in the filter pipe 2:
Formula: H=h
4-h
2=h
0-(L
3-L
2-h)-(h
1+ h/2)=L
1-L
3+ h/2=0.55m,
σ＝γ
ωH＝5.39KN/m
2，
The building site of excavation of foundation pit in Tianjin; Earlier taper injection 4 is connected with filter pipe 2 through screw thread or pin; Conduit 6 bottoms through screw thread or be nested in sleeve pipe 3 above; The outer sleeve pipes 3 that are equipped with of filter pipe 2, filter pipe 2 is slidingly matched with sleeve pipe 3, and sleeve pipe 3 is pressed on the shoulder with taper injection 4 through packing ring 5 and constitutes.
The measuring method of injection-drawing pore water pressure force measuring device comprises following order and step:
The conduit 6 that earlier pore water pressure probe 1 is connected with top before a, the test utilizes static(al) injection equipment or knocker to be driven into the projected depth of test beds;
B, conduit 6 is upwards promoted 100mm together with sleeve pipe 3, sleeve pipe 3 and taper injection 4 separates, and exposes filter pipe 2, and the test section soil layer is contacted with filter pipe 2, and the pore water in the test section soil layer infiltrates in the filter pipes 2 through infiltration hole 7;
C, warp infiltrated in 20 minutes;
D, potential electrode is lowered in the water in the filter pipe 2, through infiltrating the lifting heights of pore waters in the underground water level measurement instrumentation amount filter pipe 2; Consulting topomap learns:
h
0-test point elevation ,=3.4m
h
1The elevation of-test section soil layer is=1.6m
h
2The elevation at the mid point h/2 place of-test section soil layer ,=1.65m
h
3-pipe orifice crack height of water level arrives the height on ground ,=-0.8m
h
4-pipe orifice crack water level elevation ,=4.2m
L
1-catheter length ,=2.8m
L
2-the catheter length that bassets ,=1m
L
3-go deep into the interior conductor length of conduit to use.＝0.3m
E, calculate test section pore water pressure value through the lifting heights that infiltrate pore waters in the filter pipe 2:
Formula: H=h
4-h
2=h
0-(L
3-L
2-h)-(h
1+ h/2)=L
1-L
3+ h/2=2.55m,
σ＝γ
ω?H＝24.99KN/m
2，
The Tibet reservoir; Earlier taper injection 4 is connected with filter pipe 2 through screw thread or pin, conduit 6 bottoms through screw thread or be nested in sleeve pipe 3 above, filter pipe 2 is equipped with sleeve pipes 3 outward; Filter pipe 2 is slidingly matched with sleeve pipe 3, and sleeve pipe 3 is pressed on the shoulder with taper injection 4 through packing ring 5 and constitutes.
The measuring method of injection-drawing pore water pressure force measuring device comprises following order and step:
The conduit 6 that earlier pore water pressure probe 1 is connected with top before a, the test utilizes static(al) injection equipment or knocker to be driven into the projected depth of test beds;
B, conduit 6 is upwards promoted 200mm together with sleeve pipe 3, sleeve pipe 3 and taper injection 4 separates, and exposes filter pipe 2, and the test section soil layer is contacted with filter pipe 2, and the pore water in the test section soil layer infiltrates in the filter pipes 2 through infiltration hole 7;
C, warp infiltrated in 15 minutes;
D, potential electrode is lowered in the water in the filter pipe 2, through infiltrating the lifting heights of pore waters in the underground water level measurement instrumentation amount filter pipe 2; Consulting topomap learns:
h
0-test point elevation ,=3678m
h
1The elevation of-test section soil layer is=3676.5m
h
2The elevation at the mid point h/2 place of-test section soil layer ,=3676.6m
h
3-pipe orifice crack height of water level is to the height on ground ,=0.4m
h
4-pipe orifice crack water level elevation ,=3677.6m
L
1-catheter length ,=2.7m
L
2-the catheter length that bassets ,=1m
L
3-go deep into the interior conductor length of conduit to use.＝1.6m
E, calculate test section pore water pressure value through the lifting heights that infiltrate pore waters in the filter pipe 2:
Formula: H=h
4-h
2=h
0-(L
3-L
2-h)-(h
1+ h/2)=L
1-L
3+ h/2=1m,
σ＝γ
ω?H＝9.8KN/m
2。
Claims (3)
1. injection-drawing pore water pressure force measuring device; It is characterized in that, be by the convex section insertion filter pipe 2 of taper injection head (4), is connected with filter pipe (2) through screw thread or pin; The outer sleeve pipe (3) that is equipped with of filter pipe (2); Filter pipe (2) and sleeve pipe (3) are slidingly matched, and sleeve pipe (3) is pressed on the shoulder with taper injection head (4) through packing ring (5), and conduit (6) bottom is through screw thread or be nested in sleeve pipe (3) upper end and constitute.
2. according to the described injection of claim 1-drawing pore water pressure force measuring device; It is characterized in that filter pipe (2) is provided with infiltration hole (7), infiltration hole (7) distributes or distributes arbitrarily in filter pipe (2) equal intervals; The diameter 1-2mm in infiltration hole (7); The spacing 2-5cm in infiltration hole (7), the diameter 2.0cm of filter pipe (2), filter pipe (2) is selected from pvc pipe or metal tube.
3. the measuring method of injection-drawing pore water pressure force measuring device is characterized in that, comprises following order and step:
Assemble injection-drawing pore water pressure force measuring device before a, the test earlier; Taper injection head (4) is connected with filter pipe (2) through screw thread or pin; Filter pipe (2) is surrounded by worry paper, considers paper sleeve pipe (3) is housed outward, and filter pipe (2) is slidingly matched with sleeve pipe (3); Sleeve pipe (3) is pressed on the shoulder with taper injection head (4) through packing ring (5), and conduit (6) bottom is through screw thread or be nested in sleeve pipe (3) upper end;
B, will assemble the good injection-drawing pore water pressure force measuring device of consumption, and utilize static(al) injection equipment or knocker to be driven into the projected depth of test beds;
C, conduit (6) is upwards promoted 100-200mm together with sleeve pipe (3); Sleeve pipe (3) separates with taper injection head (4); Expose filter pipe (2), the test section soil layer is contacted with filter pipe (2), the pore water in the test section soil layer infiltrates in the filter pipe (2) through infiltration hole (7);
D, infiltrated through 10-30 minute;
E, potential electrode is lowered in the water in the filter pipe (2), through infiltrating the lifting height of pore water in the underground water level measurement instrumentation amount filter pipe (2);
F, calculate test section pore water pressure value through the lifting height that infiltrates pore water in the filter pipe (2):
Formula: H=h
4-h
2=h
0-(L
3-L
2-h)-(h
1+ h/2)=L
1-L
3+ h/2,
σ＝γ
ω?H，
In the formula: h
0-test point elevation, h
1The elevation of-test section soil layer is h
2The elevation at the mid point h/2 place of-test section soil layer, h
3-pipe orifice crack height of water level is to the height on ground, h
4-pipe orifice crack water level elevation, L
1-catheter length, L
2-the catheter length that bassets, L
3-going deep into the conductor length usefulness in the conduit, the water column on the H-test section soil layer face is high, γ
ωThe unit weight of-water, σ-test section pore water pressure value;
G, measure the lifting height that infiltrates pore water in the filter pipe (2) after, extract sleeve pipe (3) and conduit (6), taper injection head (4) and filter pipe (2) packing ring (5) discard.
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|---|---|---|---|
| CN201210030385.7A CN102564676B (en) | 2012-02-12 | 2012-02-12 | Penetrating-stretching type pore water pressure measurement device and measurement method thereof |
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|---|---|---|---|
| CN201210030385.7A CN102564676B (en) | 2012-02-12 | 2012-02-12 | Penetrating-stretching type pore water pressure measurement device and measurement method thereof |
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| CN102564676B CN102564676B (en) | 2014-08-13 |
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|---|---|---|---|
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Cited By (10)
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| CN103882879A (en) * | 2014-03-28 | 2014-06-25 | 中建城市建设发展有限公司 | Device and method for detecting depth of foundation pit dewatering |
| CN104422555A (en) * | 2013-08-23 | 2015-03-18 | 青岛理工大学 | Probe type soil body pore space water pressure measuring meter |
| CN105716781A (en) * | 2016-01-21 | 2016-06-29 | 中国海洋大学 | Beach shallow sea pore water pressure in situ observation device and method based on vibratory liquefaction principle |
| CN108444636A (en) * | 2018-06-15 | 2018-08-24 | 中国地质科学院水文地质环境地质研究所 | A kind of soil air pressure monitoring device and its monitoring method |
| CN108931332A (en) * | 2018-06-29 | 2018-12-04 | 中国二十冶集团有限公司 | The detection method of peat soil soft soil foundation hydraulic pressure |
| CN109631981A (en) * | 2018-03-19 | 2019-04-16 | 长沙理工大学 | The moisture storage capacity change in time and space and water balance monitoring method of a set of peat bog |
| CN109632595A (en) * | 2018-05-23 | 2019-04-16 | 长沙理工大学 | The apparatus and method of a set of Marsh Wetland peat horizon Groundwater Observation |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109632595A (en) * | 2018-05-23 | 2019-04-16 | 长沙理工大学 | The apparatus and method of a set of Marsh Wetland peat horizon Groundwater Observation |
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| CN108931332A (en) * | 2018-06-29 | 2018-12-04 | 中国二十冶集团有限公司 | The detection method of peat soil soft soil foundation hydraulic pressure |
| CN110411646A (en) * | 2019-07-09 | 2019-11-05 | 中铁十四局集团大盾构工程有限公司 | Formation pore hydraulic pressure force test device, production method and its application method after a kind of shield tunnel wall |
| CN110455673B (en) * | 2019-09-03 | 2020-08-07 | 浙江大学 | Device and method for in-situ measurement of gas migration parameters in unsaturated soil layer through penetration |
| CN111912562A (en) * | 2020-07-07 | 2020-11-10 | 中国电建集团华东勘测设计研究院有限公司 | Soil pressure testing device and method suitable for deep sludge layer |
| CN111912562B (en) * | 2020-07-07 | 2022-06-07 | 中国电建集团华东勘测设计研究院有限公司 | Soil pressure testing device and method suitable for deep sludge layer |
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