CN102943460B - Pore pressure cross plate device capable of evaluating sand liquefaction potentiality - Google Patents
Pore pressure cross plate device capable of evaluating sand liquefaction potentiality Download PDFInfo
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- CN102943460B CN102943460B CN201210531627.0A CN201210531627A CN102943460B CN 102943460 B CN102943460 B CN 102943460B CN 201210531627 A CN201210531627 A CN 201210531627A CN 102943460 B CN102943460 B CN 102943460B
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Abstract
The invention discloses a pore pressure cross plate device capable of evaluating sand liquefaction potentiality continuously and qualitatively. The upper part of the pore pressure cross plate device is provided with an upper thread circular tube (32) and the lower part of the pore pressure cross plate device is provided with a lower thread circular tube (31), the lower part of the upper thread circular tube (32) is connected with the lower thread circular tube (31), a pore water pressure sensor (2) is arranged in the upper thread circular tube (32) and a shaft rod (4), the upper part of the pore water pressure sensor (2) is connected with a power supply cable (1), the lower part of the lower thread circular tube (31) is connected with the shaft rod (4), a cross plate head that a pore-free plate head (52) and a porous plate head (51) are mutually vertically arranged is arranged outside the shaft rod (4), water permeating holes (6) are arranged in the middle of the porous plate head (51) along the radial direction of the lower thread circular tube (31), and a waterproof plug (7) is arranged on the bottommost end of the shaft rod (4). The pore pressure cross plate device has the characteristics of normal position, rapidness, accuracy, convenience and the like, and provides a strong detection tool for tailings dam evaluation, sand earthquake-induced liquefaction evaluation and geotechnical engineering foundation treatment practices.
Description
Technical field
The present invention relates to a kind of hole and press four-bladed vane device, belong to a kind of testing arrangement that can evaluate accurately, quantitatively saturated sand liquefaction potentiality in field of civil engineering.
Background technology
Since Casagrande in 1976 proposes to develop in-situ test sand liquefaction potentiality technology, existing many measuring technologies are applied to this on the one hand, wherein common are the most standard penetration test (SPT) and piezocone test (CPT).Sand liquefaction potentiality is mainly rule of thumb evaluated in these two kinds of tests, makes measuring technology have larger limitation.Obtain at present relevant sand cut swollen/cut contracting trend and stable state shear strength mainly by laboratory test and relevant field trial index.Soil layer original position pore water pressure force measurement contributes to evaluate sand liquefaction potentiality, is the basis of sand liquefaction because pore water pressure changes.The pore water pressure that many scholars attempt to cause while adopting hole to press static sounding technology to carry out measuring probe injection changes, and then evaluation sand liquefaction potentiality, but due to the complexity of sand damage model, the factor such as volumetric strain and the uncertainty of pore water pressure measuring position that cavity expansion causes, make to set forth in theory sand liquefaction potentiality and become comparatively complicated.Vane shear test (VST) is applicable to the undrained shear strength of the saturated soil body of in-site detecting, and its shear strength value of surveying is equivalent to test the natural soil layer of depth fixed undrained shear strength under pressure in position.VST does not need to gather soil sample, has avoided soil sample disturbance, natural strain condition to change and loaded down with trivial details laboratory test, is a kind of effectively home position testing method.
The present invention is based on conventional cross plate shearing instrument, having proposed one can be accurately, quantitatively, in-situ testing device efficiently, for Sand Liquefaction evaluation and the processing of geotechnical engineering ground etc. provide means ofquantity evaluation accurately and effectively.
Summary of the invention
Technical problem: the technical problem to be solved in the present invention is for the at present domestic in situ quantitation evaluation that cannot carry out saturated sand liquefaction potentiality, proposes a kind of hole of can in situ quantitation evaluating saturated sand liquefaction potentiality that can be used for geotechnical engineering field and presses four-bladed vane device.
Technical scheme: it is upper screw thread pipe that the top of four-bladed vane device is pressed in the hole of evaluating sand liquefaction potentiality of the present invention, bottom is lower screw thread pipe, the bottom of upper screw thread pipe is connected with lower screw thread pipe, in upper screw thread pipe and axostylus axostyle, be provided with pore water pressure sensor, the top of pore water pressure sensor connects feed cable; Connect axostylus axostyle in the bottom of lower screw thread pipe, be provided with in axostylus axostyle outside by atresia wrench and the mutual vertically disposed cross wrench of porose wrench, the middle part of porose wrench along under screw thread pipe be radially provided with permeable hole, be waterproof plug at the lowermost end of axostylus axostyle.
2 permeable holes of each abacus centriciput, aperture is 1.5mm, spacing is 20mm.
The height of cross wrench is 100mm, and diameter is 50mm, and thickness is 3mm.
The diameter of axostylus axostyle is 20mm.
The diameter of upper screw thread pipe is 20mm, and the diameter of lower screw thread pipe is 25mm.
Four-bladed vane device is pressed in the hole of evaluating saturated sand liquefaction potentiality of the present invention, measuring pore water pressure is mainly completed by measurement systems such as pore water pressure sensor, permeable hole and axostylus axostyles, and its stable state soil shear strength measures and mainly completed by conventional four-bladed vane part.By applying external torque, rotate four-bladed vane, shear the soil body, record moment of torsion, pore water pressure and rotational angular velocity in soil body shear history simultaneously, can calculate soil stabilization state shear strength and evaluate liquefaction potentiality according to correlation theory.A large amount of theoretical research and measured datas show, when saturated sand is sheared, pore water pressure rise/fall is closely related with liquefaction potentiality.In the time shearing, pore water pressure increases, and shows as liquefaction potentiality sand; In the time shearing, pore water pressure reduces, and shows as non-liquefaction potentiality sand.
Beneficial effect: in geotechnical engineering practice, the evaluation of sand liquefaction potentiality is most important.Conventional original position assessment technique mainly contains standard penetration test (SPT) and piezocone test (CPT) etc. at present, but these original position assessment techniques are mainly rule of thumb evaluated sand liquefaction potentiality, have larger limitation.Can obtain sand liquefaction trend and stable state shear strength by laboratory test and relevant in-situ test parameter, but affected by the factor such as sampling disturbance, test method, its process is time-consuming, effort, and result of the test reliability is lower.The defect that the invention solves the evaluation saturated sand liquefaction potentiality that domestic existing in-situ testing technique can not be better, accurate, quantitative, makes vane-shear measuring technology can more fully serve geotechnical engineering field.
Brief description of the drawings
Fig. 1 is component arrangement figure of the present invention;
Wherein have: feed cable 1, pore water pressure sensor 2, lower screw thread pipe 31, upper screw thread pipe 32, axostylus axostyle 4, porose wrench 51, atresia wrench 52, permeable hole 6, waterproof plug 7.
Fig. 2 is A-A sectional view in Fig. 1 of the present invention.
Detailed description of the invention
The hole of evaluating saturated sand liquefaction potentiality of the present invention presses four-bladed vane device to comprise feed cable 1, pore water pressure sensor 2, lower screw thread pipe 31, upper screw thread pipe 32, axostylus axostyle 4, porose wrench 51, atresia wrench 52, permeable hole 6, waterproof plug 7; The top of this device is upper screw thread pipe 32, bottom is lower screw thread pipe 31, the bottom of upper screw thread pipe 32 is connected with lower screw thread pipe 31, in upper screw thread pipe 32 and axostylus axostyle 4, is provided with pore water pressure sensor 2, and the top of pore water pressure sensor 2 connects feed cable 1; Bottom at lower screw thread pipe 31 connects axostylus axostyle 4, be provided with in axostylus axostyle 4 outsides by atresia wrench 52 and the mutual vertically disposed cross wrench of porose wrench 51, the middle part of porose wrench 51 along under screw thread pipe 31 be radially provided with permeable hole 6, be waterproof plug 7 at the lowermost end of axostylus axostyle 4.
Permeable hole 6 quantity are 4, and aperture is 1.5mm, and spacing is 20mm.
Four-bladed vane grease head highness is 100mm, and diameter is 50mm, and thickness is 3mm.
Axostylus axostyle 4 diameters are 20mm.
Two screw thread pipe diameters are respectively 20mm, 25mm.
A large amount of theoretical research and measured datas show, when saturated sand is sheared, pore water pressure rise/fall is closely related with liquefaction potentiality, and in the time shearing, pore water pressure increases, and show as liquefaction potentiality sand; In the time shearing, pore water pressure reduces, and shows as non-liquefaction potentiality sand.
Cross plate shearing instrument is comparatively effectively in-situ test instrument of test soil body shear stress simultaneously, according to the shear Strength Calculation method of Cadling and Odenstad (1950) proposition, obtains:
S
h＝S
v/K
In formula, S
hfor level is to shear strength, S
vfor vertically, to shear strength, K is lateral earth pressure force coefficient, and M is for applying moment of torsion, and H is four-bladed vane grease head highness, and D is cross wrench diameter.
According to conventional vane shear test requirement, press four-bladed vane device to be inserted into appointment testing position in hole, stop 2 ~ 3min, the pore water pressure causing until injection starts shear test after substantially dissipating completely, shear angle speed is shown greatly 90 °/s and is carried out, and every 16ms records moment of torsion, pore water pressure and angular velocity simultaneously.
In conjunction with relevant liquefaction theory and the above-mentioned shear Strength Calculation method of Castro and Poulos (1977) proposition, can determine saturated sand liquefaction potentiality and stable state shear strength, be that shear history pore water increases, be defined as potential liquefying soil; Pore water pressure reduces, and is defined as potential non-liquefying soil.
Claims (5)
1. four-bladed vane device is pressed in the hole that can evaluate sand liquefaction potentiality, the top that it is characterized in that this device is upper screw thread pipe (32), bottom is lower screw thread pipe (31), the bottom of upper screw thread pipe (32) is connected with lower screw thread pipe (31), in upper screw thread pipe (32) and axostylus axostyle (4), be provided with pore water pressure sensor (2), the top of pore water pressure sensor (2) connects feed cable (1); Bottom at lower screw thread pipe (31) connects axostylus axostyle (4), be provided with in axostylus axostyle (4) outside by atresia wrench (52) and the mutual vertically disposed cross wrench of porose wrench (51), at the middle part of porose wrench (51) along lower screw thread pipe (31) be radially provided with permeable hole (6), be waterproof plug (7) at the lowermost end of axostylus axostyle (4).
2. four-bladed vane device is pressed in the hole of evaluating sand liquefaction potentiality according to claim 1, it is characterized in that each porose wrench (51) 2 permeable hole in middle part (6), and aperture is 1.5mm, and spacing is 20mm.
3. four-bladed vane device is pressed in the hole of evaluating sand liquefaction potentiality according to claim 1, and the height that it is characterized in that cross wrench is 100mm, and diameter is 50mm, and thickness is 3mm.
4. four-bladed vane device is pressed in the hole of evaluating sand liquefaction potentiality according to claim 1, and the diameter that it is characterized in that axostylus axostyle (4) is 20mm.
5. four-bladed vane device is pressed in the hole of evaluating sand liquefaction potentiality according to claim 1, and the diameter that it is characterized in that screw thread pipe (32) is 20mm, and the diameter of lower screw thread pipe (31) is 25mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210531627.0A CN102943460B (en) | 2012-12-11 | 2012-12-11 | Pore pressure cross plate device capable of evaluating sand liquefaction potentiality |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210531627.0A CN102943460B (en) | 2012-12-11 | 2012-12-11 | Pore pressure cross plate device capable of evaluating sand liquefaction potentiality |
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| CN102943460A CN102943460A (en) | 2013-02-27 |
| CN102943460B true CN102943460B (en) | 2014-08-13 |
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| CN201210531627.0A Expired - Fee Related CN102943460B (en) | 2012-12-11 | 2012-12-11 | Pore pressure cross plate device capable of evaluating sand liquefaction potentiality |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106290006B (en) * | 2016-08-08 | 2018-11-23 | 河海大学 | A kind of experimental rig measuring shear strength parameter variation in soft clay consolidation process |
| CN111257135B (en) * | 2020-01-21 | 2021-10-08 | 同济大学 | Test device and method for measuring shear rheological property of liquefiable soil in centrifugal field |
| US20230220644A1 (en) * | 2020-06-18 | 2023-07-13 | Yvo KEULEMANS | A measuring device and method of use thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080884A (en) * | 1998-09-08 | 2000-03-21 | Yuji Abe | Soil and underground water simultaneous sampling device |
| CN1560581A (en) * | 2004-02-20 | 2005-01-05 | 中国科学院力学研究所 | Dynamic pore water pressure measuring method |
| CN101865802A (en) * | 2010-05-26 | 2010-10-20 | 西安科技大学 | Soil in-situ shear resistance tester |
| CN102011389A (en) * | 2010-11-11 | 2011-04-13 | 广东永基建筑基础有限公司 | Soil body in situ test device and test method applying same |
| CN102607965A (en) * | 2012-03-13 | 2012-07-25 | 河海大学 | Double-cross detector and testing method for testing shearing strength values of soil mass in situ |
| CN102788731A (en) * | 2011-05-20 | 2012-11-21 | 天津市富楷程地质机械制造有限公司 | Vane-shear apparatus for reconnaissance |
-
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- 2012-12-11 CN CN201210531627.0A patent/CN102943460B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080884A (en) * | 1998-09-08 | 2000-03-21 | Yuji Abe | Soil and underground water simultaneous sampling device |
| CN1560581A (en) * | 2004-02-20 | 2005-01-05 | 中国科学院力学研究所 | Dynamic pore water pressure measuring method |
| CN101865802A (en) * | 2010-05-26 | 2010-10-20 | 西安科技大学 | Soil in-situ shear resistance tester |
| CN102011389A (en) * | 2010-11-11 | 2011-04-13 | 广东永基建筑基础有限公司 | Soil body in situ test device and test method applying same |
| CN102788731A (en) * | 2011-05-20 | 2012-11-21 | 天津市富楷程地质机械制造有限公司 | Vane-shear apparatus for reconnaissance |
| CN102607965A (en) * | 2012-03-13 | 2012-07-25 | 河海大学 | Double-cross detector and testing method for testing shearing strength values of soil mass in situ |
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