CN104897464A - Consolidation apparatus for measuring static earth pressure coefficient and small strain shear modulus - Google Patents
Consolidation apparatus for measuring static earth pressure coefficient and small strain shear modulus Download PDFInfo
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Abstract
The invention relates to a consolidation apparatus for measuring static earth pressure coefficient and small strain shear modulus, which comprises a consolidation apparatus container equipped with a soil sample and provided with a loading plate used for connecting with a loading device; Two pairs of film pressure transducers symmetrically arranged at left and right side surfaces as well as upper and down inner walls of the consolidation apparatus container; three pairs of bending element wave velocity test components symmetrically arranged at six side surface groove holes of the consolidation apparatus container; and an synthetic glass observation window embedded at front side surface of the consolidation apparatus container. Compared with prior art, the stress on horizontal and vertical directions of earth can be simultaneously measured, static earth pressure coefficient can be determined, small strain shear modulus of anisotropy earth can be obtained during a complete lateral confinement loading/unloading process, development condition of anisotropy of earth structure can be observed by using the synthetic glass observation window and a high definition digital camera as well as combining a PIV image processing technology, and the consolidation apparatus has the advantages of simple operation, various functions, high testing precision and little error.
Description
Technical field
The present invention relates to During Geotechnical Tests studying technological domain, especially relate to a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus.
Background technology
Along with the develop rapidly of China's urban construction, the process of urbanization facilitates the sharply development of big city in quantity and scale.People will constantly expand new living space, develop the underground space of the Rock And Soil that deepens continuously and build more and more higher high-rise building.For these engineering support security and economy, the precision needed when computational analysis is more and more higher, improves the required many factors considered of computational accuracy, and one of them factor crucial and that assistant officer is to be studied is exactly the impact of anisotropy on soil body proterties.
The soil body is the product of the Nature, can produce certain initial anisotropy when deposition is formed under gravity.Initial anisotropy has larger impact for the distortion of soil and intensity.In addition, at present to the understanding adding Induced Anisotropy that unloading etc. causes and the inner link between initial anisotropy and Induced Anisotropy due to stress and lack science.
Under day by day complicated engineering background, the anisotropy how quantitative description two kinds is different the appropriate characteristic reasonably distinguishing the soil body under two kinds of different anisotropy are the important contents of soil mechanics scientific research, be also solve engineering problem in the urgent need to.The anisotropic degree at present carrying out the quantitatively characterizing soil body with the anisotropy of small-strain shear modulus is a kind of applicable method, but very limited to the understanding of the anisotropic properties of small-strain shear modulus and the inner link of resistance to shear of soil anisotropy, soil structures initial anisotropy and Induced Anisotropy.
In addition, there are several comparatively distinct issues by during traditional experiment instrument determination this important parameter of coefficient of static earth pressure, comprise: document " Okochi, Y., Tatsuoka, F.:Some factors affecting K0-values of sand measured in triaxial cell.Soils Found.24 (3), 52 – 68 (1984) " in the triaxial apparatus mentioned or plane strain consolidometer side strain excessive and complete side limit condition can not be realized, document " Takashi, T, Yoshiaki, K.:K0consolidation of undisturbed clays by means of triaxial cell.Soils Found.31 (3), 127 – 137 (1991) " draining wallpaper flexibility between the rubber membrane of triaxial apparatus mentioned and soil sample is excessive, document " Yamamuro, J.A., Bopp, P.A., Lade, P.V.:One-dimensional compression of sands at high pressures.J.Geotech.Eng.122 (2), 147 – 154 (1996) " more accurately can not there is overstrain etc. by mensuration level ring body to stress and in uninstall process in the consolidometer mentioned.
Summary of the invention
Object of the present invention is exactly the consolidometer providing a kind of simple to operate, diverse in function, test accuracy is high, error is little measured coefficient of static earth pressure and small-strain shear modulus in order to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus comprises:
Soil sample is housed and is provided with the consolidometer container of the load plate for connecting charger;
Be symmetricly set on two pairs of diaphragm pressure sensors of consolidometer container left and right side, upper and lower side inwall;
Be symmetricly set on three pairs of flexure element wave velocity testing elements in consolidometer container six lateral groove holes;
Be embedded in the organic glass observation window of consolidometer container leading flank;
Measure the stress on soil body horizontal and vertical direction by diaphragm pressure sensor and obtain soil body coefficient of static earth pressure, measure soil body shear wave velocity by flexure element wave velocity testing element and obtain the small-strain shear modulus of the anisotropy soil body, by the anisotropic development of soil body group structure in organic glass observation window viewing test process.
Described consolidometer container is cube structure, also comprise container body and removable side panel, described container body is made up of three pieces of fixed sides and one piece of fixed base plate, form the front and back sides of consolidometer container, left surface and downside, described removable side panel is connected with container body, form the right flank of consolidometer container, described load plate is located at soil sample top in consolidometer container, forms the upper side of consolidometer container.
Described removable side panel is connected by some bolts perpendicular to fixed side with container body.
Described three pairs of flexure element wave velocity testing elements regulate the degree of depth inserting soil sample by corresponding groove hole.
Described two pairs of diaphragm pressure sensors are pasted on consolidometer container inner wall by glue.
The thickness of the described each side of consolidometer container and organic glass observation window is 15-20mm.
Described load plate connects charger by the protruding bar of the loading of center.
Also comprise the digital camera coordinating organic glass observation window to carry out soil sample observation.
Compared with prior art, the present invention has the following advantages:
1) what consolidometer container adopted container body, removable side panel and load plate can free dismantling combined structure, and this feature can be utilized to generate the soil sample of different initial anisotropy by the rotary container when filling and presenting soil sample.
2) consolidometer is provided with three pairs of flexure element wave velocity testing elements on three principal stress directions, measures the anisotropy of soil body shear wave velocity and small-strain shear modulus.Can be used for analyzing Soil Anisotropic in one-dimensional consolidation on the one hand, on the impact of small-strain shear modulus, small-strain shear modulus anisotropy can be utilized to carry out the anisotropy of quantitatively characterizing soil sample on the other hand, comprise initial anisotropy and Induced Anisotropy.
3) consolidometer adopts diaphragm pressure sensor directly mensuration level and the vertical pressure calculate coefficient of static earth pressure being affixed on container inner wall, solves traditional consolidometer Problems existing well.
4) transparent organic glass is equipped with in consolidometer container side, coordinate high-definition digital camera and PIV image processing techniques, carry out quantitative description by Two-order Fabric Tensor in microcosmic soil mechanics theory and to add in uninstall process the anisotropic development of soil body group structure and different initial anisotropy to the impact of Induced Anisotropy, and and the soil body group structure anisotropy that characterizes of small-strain shear modulus anisotropy compare.
5) consolidometer container adopts the thickness of container body, removable side panel, load plate and organic glass observation window to be 15-20mm, ensures the rigidity requirement that complete side is limit.
Accompanying drawing explanation
Fig. 1 is consolidometer structure of container schematic perspective view in the present invention;
Fig. 2 is consolidometer structure perspective diagram of the present invention.
In figure: 1, container body, 2, removable side panel, 3, load plate, 4, left side diaphragm pressure sensor, 5, rear side flexure element wave velocity testing element, 6, organic glass observation window, 7, left lateral bending unit velocity of wave testing element, 8, downside diaphragm pressure sensor, 9, downside flexure element wave velocity testing element, 10, front side flexure element wave velocity testing element, 11, bolt, 12, right side diaphragm pressure sensor, 13, right lateral bending unit velocity of wave testing element, 14, upside flexure element wave velocity testing element, 15, load protruding bar, 16, upper side thin membrane pressure transducer.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment is implemented premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As Fig. 1, shown in Fig. 2, a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus comprises consolidometer container, for measuring the diaphragm pressure sensor of level and vertical earth pressure, for measuring the flexure element wave velocity testing element of the small-strain shear modulus of three principal directions of stress and the organic glass observation window 6 of soil body group structure anisotropy development in observation experiment can being facilitated, and the high-definition digital camera to be combined with organic glass observation window 6, wherein, consolidometer container is cube structure, comprise container body 1, removable side panel 2 and the load plate 3 applied for external load, diaphragm pressure sensor is two to totally four, comprise left side diaphragm pressure sensor 4, right side diaphragm pressure sensor 12, upper side thin membrane pressure transducer 16 and downside diaphragm pressure sensor 8, flexure element wave velocity testing element is three to totally six, comprise front side flexure element wave velocity testing element 10, rear side flexure element wave velocity testing element 5, left lateral bending unit velocity of wave testing element 7, right lateral bending unit velocity of wave testing element 13, upside flexure element wave velocity testing element 14 and downside flexure element wave velocity testing element 9.Concrete connection is:
Container body 1 is made up of three pieces of fixed sides and one piece of fixed base plate, form the front and back sides of consolidometer container, left surface and downside, removable side panel 2 is connected to the bolt 11 perpendicular to fixed side by three with container body 1, form the right flank of consolidometer container, load plate 3 is located at soil sample top in consolidometer container, form the upper side of consolidometer container, load plate 3 connects external load device by the protruding bar 15 of the loading of center, two pairs of diaphragm pressure sensors are pasted on the left and right side of consolidometer container by metallo-plastic multifunctional water-proofing glue symmetry, upper and lower side inwall, three offside flexure element wave velocity testing element symmetry are arranged on the front and back sides of consolidometer container, left and right side, in the groove hole of upper and lower side, lateral bend unit velocity of wave testing element is regulated to insert the degree of depth of soil sample by corresponding groove hole, organic glass observation window 6 is embedded in the leading flank of consolidometer container, the Thickness scope of each side of consolidometer container and organic glass observation window 6 is 15-20mm.
In the present embodiment, the wall thickness of container body 1, removable side panel 2 and load plate 3 is 15mm, and the long 150mm of being of the consolidometer container that container body 1, removable side panel 2 and load plate 3 surround, the wide 150mm of being, height are 150mm.Organic glass observation window 6 is long is 60mm, height is 60mm, thickness is the cube of 15mm.The groove hole radius of setting flexure element wave velocity testing element is 8mm, the degree of depth is 15mm.Flexure element wave velocity testing element radius is 7.4mm, thickness is 20mm, is embedded in groove hole.Bolt 11 length is 50mm.Container body 1, removable side panel 2, load plate 3 and organic glass observation window 6 thickness ensure the rigidity requirement that complete side is limit.
The course of work:
1) in consolidometer container, soil sample adopts legal system of raining standby, and the relative density of soil sample is controlled by the method height of drop that rains, and the initial anisotropy of soil sample is by container body 1 left surface pitch angle control with respect to the horizontal plane.
2) prepared soil sample removable side panel 2 is connected by bolt 11 with container body 1, by container body 1 horizontal positioned, and by load plate 3 horizontal positioned and soil sample, load plate 3 loads protruding bar 15 to be connected with external load device, one dimension can be carried out to soil sample by control external load device and add unloading.
3) in process of the test, utilize diaphragm pressure sensor to measure soil sample level and vertical earth pressure, coefficient of static earth pressure and stress anisotropy degree can be calculated.Meanwhile, in process of the test, utilize three pairs of flexure element wave velocity testing elements to measure shear wave velocity on three directions respectively, and calculate corresponding small-strain shear modulus; In process of the test, available high-definition digital camera carries out local by organic glass observation window 6 pairs of soil samples and takes pictures, and obtains soil body fabric information by PIV image processing techniques, the anisotropic development of true quantitative test soil body group structure.
Claims (8)
1. can measure a consolidometer for coefficient of static earth pressure and small-strain shear modulus, it is characterized in that, comprising:
Soil sample is housed and is provided with the consolidometer container of the load plate for connecting charger;
Be symmetricly set on two pairs of diaphragm pressure sensors of consolidometer container left and right side, upper and lower side inwall;
Be symmetricly set on three pairs of flexure element wave velocity testing elements in consolidometer container six lateral groove holes;
Be embedded in the organic glass observation window of consolidometer container leading flank;
Measure the stress on soil body horizontal and vertical direction by diaphragm pressure sensor and obtain soil body coefficient of static earth pressure, measure soil body shear wave velocity by flexure element wave velocity testing element and obtain the small-strain shear modulus of the anisotropy soil body, by the anisotropic development of soil body group structure in organic glass observation window viewing test process.
2. a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus according to claim 1, it is characterized in that, described consolidometer container is cube structure, also comprise container body and removable side panel, described container body is made up of three pieces of fixed sides and one piece of fixed base plate, form the front and back sides of consolidometer container, left surface and downside, described removable side panel is connected with container body, form the right flank of consolidometer container, described load plate is located at soil sample top in consolidometer container, forms the upper side of consolidometer container.
3. a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus according to claim 2, is characterized in that, described removable side panel is connected by some bolts perpendicular to fixed side with container body.
4. a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus according to claim 1, is characterized in that, described three pairs of flexure element wave velocity testing elements regulate the degree of depth inserting soil sample by corresponding groove hole.
5. a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus according to claim 1, is characterized in that, described two pairs of diaphragm pressure sensors are pasted on consolidometer container inner wall by glue.
6. a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus according to claim 1, is characterized in that, the thickness of the described each side of consolidometer container and organic glass observation window is 15-20mm.
7. a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus according to claim 1, is characterized in that, described load plate connects charger by the protruding bar of the loading of center.
8. a kind of consolidometer measuring coefficient of static earth pressure and small-strain shear modulus according to claim 1, is characterized in that, also comprises the digital camera coordinating organic glass observation window to carry out soil sample observation.
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Cited By (9)
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| CN106596283A (en) * | 2016-11-15 | 2017-04-26 | 广州市香港科大霍英东研究院 | Temperature control three-axis system capable of accurately measuring unsaturated soil deformation rule |
| CN106872275A (en) * | 2017-04-13 | 2017-06-20 | 石家庄铁道大学 | A kind of simple three-dimensional loading and unloading device and its detection method |
| US10508978B2 (en) | 2017-11-03 | 2019-12-17 | Saudi Arabian Oil Company | Strain energy-based method and apparatus to determine the coefficient of resilience of lost circulation materials |
| CN110988141A (en) * | 2019-11-29 | 2020-04-10 | 同济大学 | On-site soil sample three-dimensional testing device and method based on shear wave velocity |
| CN111119151A (en) * | 2020-01-16 | 2020-05-08 | 谢小丽 | Device for measuring anisotropy of liquefied solid-liquid phase variable stress and wave velocity of soil body in centrifugal field |
| CN112834319A (en) * | 2021-01-25 | 2021-05-25 | 中国科学院武汉岩土力学研究所 | Method for determining mechanical parameters of soft soil small strain hardening model |
| CN113790974A (en) * | 2021-10-12 | 2021-12-14 | 中国科学院武汉岩土力学研究所 | Soil body horizontal stress testing method and system based on flexible consolidation pressure chamber |
| CN115097109A (en) * | 2022-08-26 | 2022-09-23 | 矿冶科技集团有限公司 | Simulation experiment system and method for dead weight consolidation process of stope tailing filling slurry |
| CN115266300A (en) * | 2022-06-23 | 2022-11-01 | 重庆大学 | Microorganism reinforced one-dimensional compression consolidation box and test method |
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| CN106596283A (en) * | 2016-11-15 | 2017-04-26 | 广州市香港科大霍英东研究院 | Temperature control three-axis system capable of accurately measuring unsaturated soil deformation rule |
| CN106872275A (en) * | 2017-04-13 | 2017-06-20 | 石家庄铁道大学 | A kind of simple three-dimensional loading and unloading device and its detection method |
| US10508978B2 (en) | 2017-11-03 | 2019-12-17 | Saudi Arabian Oil Company | Strain energy-based method and apparatus to determine the coefficient of resilience of lost circulation materials |
| CN110988141A (en) * | 2019-11-29 | 2020-04-10 | 同济大学 | On-site soil sample three-dimensional testing device and method based on shear wave velocity |
| CN110988141B (en) * | 2019-11-29 | 2021-09-14 | 同济大学 | On-site soil sample three-dimensional testing device and method based on shear wave velocity |
| CN111119151A (en) * | 2020-01-16 | 2020-05-08 | 谢小丽 | Device for measuring anisotropy of liquefied solid-liquid phase variable stress and wave velocity of soil body in centrifugal field |
| CN112834319A (en) * | 2021-01-25 | 2021-05-25 | 中国科学院武汉岩土力学研究所 | Method for determining mechanical parameters of soft soil small strain hardening model |
| CN113790974A (en) * | 2021-10-12 | 2021-12-14 | 中国科学院武汉岩土力学研究所 | Soil body horizontal stress testing method and system based on flexible consolidation pressure chamber |
| CN113790974B (en) * | 2021-10-12 | 2022-11-29 | 中国科学院武汉岩土力学研究所 | Soil body horizontal stress testing method and system based on flexible consolidation pressure chamber |
| CN115266300A (en) * | 2022-06-23 | 2022-11-01 | 重庆大学 | Microorganism reinforced one-dimensional compression consolidation box and test method |
| CN115097109A (en) * | 2022-08-26 | 2022-09-23 | 矿冶科技集团有限公司 | Simulation experiment system and method for dead weight consolidation process of stope tailing filling slurry |
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