CN203307792U - Micro-scale pore pressure static sounding probe for effectively identifying ultra-thin soil layer - Google Patents
Micro-scale pore pressure static sounding probe for effectively identifying ultra-thin soil layer Download PDFInfo
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- CN203307792U CN203307792U CN2013203639145U CN201320363914U CN203307792U CN 203307792 U CN203307792 U CN 203307792U CN 2013203639145 U CN2013203639145 U CN 2013203639145U CN 201320363914 U CN201320363914 U CN 201320363914U CN 203307792 U CN203307792 U CN 203307792U
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Abstract
The utility model discloses a micro-scale pore pressure static sounding probe for effectively identifying an ultra-thin soil layer. The probe is characterized in that a stainless steel conduit (1) is taken as a matrix; a friction sleeve (2) is arranged at the lower half part of the outer side of the stainless steel conduit (1); the stainless steel conduit (1) and the friction sleeve (2) are connected and sealed through an organic silica gel seal ring (3); a strain gauge (4) is arranged at the lower part of the inner surface of the stainless steel conduit (1) and is connected with an external circuit through a lead (5) to form a single-armed bridge; a pore water pressure sensor (6) is arranged below the strain gauge (4); a pore pressure filter ring (7) is arranged below the friction sleeve (2); a cone-shaped probe (8) is arranged below the pore pressure filter ring (7). The micro-scale pore pressure static sounding probe has the advantages of in-situ identifying, rapidness, high resolution and the like; an effective detection tool is provided for identifying and evaluating the ultra-thin soil layers in geological exploration and geotechnical engineering and measuring the bearing capacity of the liquefied sandy soil.
Description
Technical field
The utility model is related to a kind of minute yardstick pore pressure static sounding probe, belong in civil engineering, Geotechnical Engineering field it is a kind of can it is in situ, quick and it is accurate identification with evaluate the very thin soil layer of subsurface and liquefaction after sand bearing capacity determine static sounding device.
Background technology
Static sounding technology refers to utilize pressure apparatus by the sounding rod indentation test soil layer with contact probe, static point resistance, side friction power of soil etc. are tested by measurement system, soil layer identification can be carried out and some basic physical mechanics properties of soil are determined, such as native allowable bearing, the severe of soil.Static sounding technology has the history of more than 80 years so far, is widely used in the world, and China succeeds in developing electric measuring type static sounding in nineteen sixty-five and applied to prospecting first.Static sounding technology have rapidly, continuously, it is reliable and the features such as do not sample, partly or entirely instead of the probing and sampling in engineering investigation.The test parameter that static sounding is mainly obtained has three, i.e.,：Static point resistance, side friction power and pore water pressure, but it is due to the disturbance of probe cone, completely accurate each strata condition can not be detected, during especially in the presence of relatively thin or very thin interlayer, standard static sounding device can not then obtain more satisfied result.The static sounding probe specification of standard is in the world：Diameter 35.7mm；60 ° of cone angle；Bore basal cross section product 10cm2；Sidewall friction cylinder surface area 150cm2；Injection speed 20mm/s.The resolution ratio tested of popping one's head in and the size of disturbance region are closely related, and size is bigger, and the disturbance region during probe injection shearing soil body is also bigger, causes resolution ratio lower.Tumay etc.（1998）Research thinks that miniature probe can obtain higher static point resistance and relatively low side friction power, can obtain more fine soil layer identification with dividing.In practice, often there is relatively thin or very thin interlayer, such as sand interlayer, silt interlayer in engineering site, these soil thickness are generally smaller in soil layer under earth's surface（Thickness is about 15mm）, but the characteristic such as bearing capacity on whole ground has very important influence.Repeatedly the measure of the bearing capacity of sand foundation is to evaluate one of important indicator of sand foundation after liquefaction, and after different liquefaction number of times, the bearing capacity of sand foundation is also different.The resolution ratio of standard static sounding probe can not possess the bearing capacity for recognizing very thin soil layer and determining sand foundation after repeatedly liquefaction, therefore, and people are progressively developed with developing new miniature probe.
Minute yardstick pore pressure static sounding probe of the present utility model, there is provided one kind can continuously, quantitative, high-resolution in-situ test instrument, for very thin soil layer in geological mapping, Geotechnical Engineering identification with evaluate and liquefaction after the measure of sand bearing capacity effective testing tool is provided.
Utility model content
Technical problem：The technical problems to be solved in the utility model is can not to carry out very thin soil layer for the current country（Soil thickness≤15mm）Static sounding identification with evaluate and liquefaction after sand bearing capacity in-site detecting, propose it is a kind of available for civil engineering, Geotechnical Engineering field can identification in situ and the static sounding probe evaluating very thin soil layer and determine sand bearing capacity after liquefaction.
Technical scheme：The minute yardstick pore pressure static sounding probe of the present utility model for effectively recognizing very thin soil layer is using stainless steel pipe as matrix, lower half on the outside of stainless steel pipe is provided with friction sleeve, stainless steel pipe is connected sealing with friction sleeve by organic silica gel sealing ring, in stainless steel pipe inner surface, position is provided with strain gauge on the lower, strain gauge connects into wheatstone bridge by wire and external circuit, pore water pressure sensor is provided with below strain gauge, it is conical probe to be provided with the lower section of friction sleeve below pore pressure filter ring, pore pressure filter ring.
The external diameter of stainless steel pipe is 5mm, and internal diameter is 2.8mm, and the wall thickness with the sleeve contact portion that rubs is 0.5mm.
The length of friction sleeve is 22.0mm, and thickness is 0.5mm, and surface area is 346mm2。
The sensing length of strain gauge is 1.0mm.
The cone angle of conical probe is 60 °, and cone basal cross section product is 19.6mm2。
The injection speed of minute yardstick pore pressure static sounding probe is 1mm/s, and the input voltage of wheatstone bridge is 2.0V, and test environment temperature is preferably 18~22 DEG C, and test frequency is 2 points/mm on MTD direction in space.
Strain gauge is symmetrically distributed in stainless steel pipe inwall, for measuring the static point resistance during minute yardstick probe injection soil body, and strain is calculated as special high sensitivity strain gauge, and sensing length is 1.0mm.Two strain gauges connect with external circuit, constitute favour stone wheatstone bridge, the input supply voltage of whole test circuit is 2.0V, when minute yardstick pops one's head in the injection soil body, the change of self-resistance is changed into voltage change by signal amplifier and inputs computer by strain gauge, is ultimately converted to static point resistance change.
The size of probe injection speed has important influence to soil layer drainage condition.According to Cho etc.（2004）The utilization pore pressure dissipation time t of propositiondisWith injection time tpenRatio relation determine the drainage condition under certain injection speed, its correlation computations expression formula is：
In formula, d is probe diameter；cvFor pore pressure dissipation coefficient；λ is the cone length of injection；VinFor injection speed.
Minute yardstick pore pressure static sounding probe injection speed V of the present utility modelinFor 1mm/s, probe diameter d is 5mm, and the cone length lambda of injection is pore pressure dissipation coefficient c in 4.33mm, argillic horizonvIt is assumed that 1.0 × 10-3Cm/s, then
It is then und rained condition.Minute yardstick probe on-the-spot test environment is preferably 18~22 DEG C, and test frequency is 2 points/mm on MTD direction in space.
Beneficial effect：It is continuous, quick, accurate and the features such as need not sample that static sounding technology has, the extensive application in civil engineering, geotechnology survey and design.Engineering is in practice, some short laps are usually present in soil layer, these thes thickness of the layer are generally smaller, the even only 15mm or so having, international standard static sounding probe is due to the limitation of probe size, it can not be sampled with certain deficiency, live original position when recognizing very thin soil layer, soil body relevant nature can not be evaluated.After sand liquefaction, its bearing capacity accordingly changes, and after difference liquefaction number of times, sand bearing capacity is also different.Domestic existing standard static sounding probe can not possess the resolution ratio for recognizing very thin soil layer and evaluating sand bearing capacity after repeatedly liquefaction, and this is unfavorable to engineering investigation and design etc..
The utility model solves domestic existing static sounding technology and can not preferably recognize very thin soil layer and evaluate the limitation of sand bearing capacity after repeatedly liquefaction, the resolution ratio of static sounding measuring technology can be greatly improved, very thin interlayer in accurate and effective identification soil layer and the sand bearing capacity after different liquefaction number of times, the static sounding technical profession for being can more fully serve civil engineering, Geotechnical Engineering field.The features such as this technology has continuity, accuracy and forthright high-resolution.
Brief description of the drawings
Fig. 1 is component arrangement figure of the present utility model；
Fig. 2 is static point resistance test circuit schematic diagram；
Wherein have：Stainless steel pipe 1, rub sleeve 2, organic silica gel sealing ring 3, strain gauge 4, wire 5, pore water pressure sensor 6, pore pressure filter ring 7, conical probe 8.
Embodiment
The probe is using stainless steel pipe as matrix, lower half on the outside of stainless steel pipe is provided with friction sleeve, stainless steel pipe is connected sealing with friction sleeve by organic silica gel sealing ring, in stainless steel pipe inner surface, position is provided with strain gauge on the lower, strain gauge connects into wheatstone bridge by wire and external circuit, pore water pressure sensor is provided with below strain gauge, it is conical probe to be provided with the lower section of friction sleeve below pore pressure filter ring, pore pressure filter ring.
The external diameter of stainless steel pipe is 5mm, and internal diameter is 2.8mm, and the wall thickness with the sleeve contact portion that rubs is 0.5mm.
The length of friction sleeve is 22.0mm, and thickness is 0.5mm, and surface area is 346mm2。
The sensing length of strain gauge is 1.0mm.
The cone angle of conical probe is 60 °, and cone basal cross section product is 19.6mm2。
The injection speed of minute yardstick pore pressure static sounding probe is 1mm/s, and the input voltage of wheatstone bridge is 2.0V, and test environment temperature is preferably 18~22 DEG C, and test frequency is 2 points/mm on MTD direction in space.
It is illustrated in figure 2 static point resistance test circuit schematic diagram.Strain gauge is symmetrically distributed in stainless steel pipe inwall, for measuring the static point resistance during minute yardstick probe injection soil body, and strain is calculated as special high sensitivity strain gauge, and sensing length is 1.0mm.Two strain gauges connect with external circuit, constitute favour stone wheatstone bridge, the input supply voltage of whole test circuit is 2.0V, when minute yardstick pops one's head in the injection soil body, the change of self-resistance is changed into voltage change by signal amplifier and inputs computer by strain gauge, is ultimately converted to static point resistance change.
During live in-situ test, minute yardstick need to be popped one's head in by special injection equipment and be tested with 1mm/s injection speed injection in the soil body, test frequency on probe depth of penetration direction is 2 points/mm, the electric signal of test is converted into static point resistance value by external circuitses, very thin soil layer is recognized according to the change of static point resistance and sand bearing capacity etc. after liquefaction is determined.The scholar's research such as Lunne think that test of the probe size effect on static point resistance and side friction power influences highly significant, such as cone basal cross section product 1.27cm2Probe test static point resistance value than standard section accumulate 10cm2It is high by 15% or so, with higher sensitivity during minute yardstick pore pressure static sounding probe of the present utility model test soil body static point resistance（Amplify static point resistance value）, can effectively recognize with evaluating very thin soil layer（Soil thickness≤15mm）With liquefied after sand bearing capacity measure, be a kind of high-precision in-situ test instrument.
Claims (6)
1. a kind of minute yardstick pore pressure static sounding probe for effectively recognizing very thin soil layer, the probe is with stainless steel pipe（1）For matrix, in stainless steel pipe（1）The lower half in outside is provided with friction sleeve（2）, stainless steel pipe（1）With friction sleeve（2）Pass through organic silica gel sealing ring（3）Connection sealing, in stainless steel pipe（1）Position is provided with strain gauge to inner surface on the lower（4）, strain gauge（4）Pass through wire（5）Wheatstone bridge, strain gauge are connected into external circuit（4）Lower section be provided with pore water pressure sensor（6）, in friction sleeve（2）Lower section be provided with pore pressure filter ring（7）, pore pressure filter ring（7）Lower section be conical probe（8）.
2. according to claim 1 can effectively recognize the minute yardstick pore pressure static sounding probe of very thin soil layer, it is characterised in that stainless steel pipe（1）External diameter be 5mm, internal diameter is 2.8mm, with friction sleeve（2）The wall thickness of contact portion is 0.5mm.
3. according to claim 1 can effectively recognize the minute yardstick pore pressure static sounding probe of very thin soil layer, it is characterised in that friction sleeve（2）Length be 22.0mm, thickness is 0.5mm, and surface area is 346mm2。
4. according to claim 1 can effectively recognize the minute yardstick pore pressure static sounding probe of very thin soil layer, it is characterised in that strain gauge（4）Sensing length be 1.0mm.
5. according to claim 1 can effectively recognize the minute yardstick pore pressure static sounding probe of very thin soil layer, it is characterised in that conical probe（8）Cone angle be 60 °, cone basal cross section product be 19.6mm2。
6. according to claim 1 can effectively recognize the minute yardstick pore pressure static sounding probe of very thin soil layer, it is characterized in that the injection speed of minute yardstick pore pressure static sounding probe is 1mm/s, the input voltage of wheatstone bridge is 2.0V, test environment temperature is preferably 18~22 DEG C, and test frequency is 2 points/mm on MTD direction in space.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343530A (en) * | 2013-06-21 | 2013-10-09 | 东南大学 | Micro-scale pore pressure static sounding probe for effectively identifying extra-thin soil layer |
| CN104234023A (en) * | 2014-09-19 | 2014-12-24 | 东南大学 | Bentonite slurry lubricated penetration rod used for piezocone penetration test |
| CN108318326A (en) * | 2018-01-19 | 2018-07-24 | 浙江大学 | A kind of miniature static sounding feeler lever |
| CN110132773A (en) * | 2019-05-20 | 2019-08-16 | 东南大学 | A kind of miniature penetrometer of snow for detecting snow deposit characteristic and its operating method |
| CN110607790A (en) * | 2019-10-23 | 2019-12-24 | 中国海洋大学 | Deep sea static sounding probe |
-
2013
- 2013-06-21 CN CN2013203639145U patent/CN203307792U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343530A (en) * | 2013-06-21 | 2013-10-09 | 东南大学 | Micro-scale pore pressure static sounding probe for effectively identifying extra-thin soil layer |
| CN103343530B (en) * | 2013-06-21 | 2015-08-26 | 东南大学 | The micro-scale pores pressure static sounding probe of the very thin soil layer of a kind of effective identification |
| CN104234023A (en) * | 2014-09-19 | 2014-12-24 | 东南大学 | Bentonite slurry lubricated penetration rod used for piezocone penetration test |
| CN108318326A (en) * | 2018-01-19 | 2018-07-24 | 浙江大学 | A kind of miniature static sounding feeler lever |
| CN108318326B (en) * | 2018-01-19 | 2020-11-20 | 浙江大学 | Miniature static sounding probe rod |
| CN110132773A (en) * | 2019-05-20 | 2019-08-16 | 东南大学 | A kind of miniature penetrometer of snow for detecting snow deposit characteristic and its operating method |
| CN110607790A (en) * | 2019-10-23 | 2019-12-24 | 中国海洋大学 | Deep sea static sounding probe |
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Granted publication date: 20131127 Termination date: 20150621 |
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