CN104792608A - Shear box group for direct shear test of undisturbed sandy soil - Google Patents
Shear box group for direct shear test of undisturbed sandy soil Download PDFInfo
- Publication number
- CN104792608A CN104792608A CN201510142617.1A CN201510142617A CN104792608A CN 104792608 A CN104792608 A CN 104792608A CN 201510142617 A CN201510142617 A CN 201510142617A CN 104792608 A CN104792608 A CN 104792608A
- Authority
- CN
- China
- Prior art keywords
- shear box
- box
- cutting ring
- shear
- down cut
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a shear box group for a direct shear test of undisturbed sandy soil. The shear box group comprises a water storage box, a lower shear box, a lower water-permeable plate, lower filter paper, an upper shear box, upper filter paper, an upper water-permeable plate and a pressure transfer plate, wherein a drainage hole is formed in the bottom of the side wall of the lower shear box; the shear box group is characterized in that a base plate is arranged in the lower shear box and is located below the lower water-permeable plate; the inner wall of the lower shear box is attached to the lower part of a combined cutting ring; the inner wall of the upper shear box is attached to the upper part of the combined cutting ring; the lower and upper cutting ring walls of the combined cutting ring are the same in thickness and are connected through fixing pins embedded in the cutting ring walls; a connected position of the upper part and the lower part of the combined cutting ring are flush with a junction position of the lower shear box and the upper shear box; the outer diameter of the upper water-permeable plate in the upper shear box is equal to the inner diameter of the combined cutting ring. The shear box group can be used for the preparation and shear test of sandy soil samples without destroying the nature of sandy soil, is easy to operate, good in matching property, and relatively accurate in test results.
Description
Technical field
The present invention relates to a kind of shear box group for original state sandy soil direct shear test, belong to laboratory soil test field.
Background technology
The instrument that direct shear test (abbreviation direct shear test) adopts is direct shear apparatus, is divided into strain controlling formula and Stress Control formula two kinds, and what current China generally adopted is strain controlling formula direct shear apparatus.Direct shear apparatus is taken into account displacement measurement system formed by shear box, press perpendicular equipment, shearing gearing, dynamometry.Shear box is then formed primarily of upper shear box, down cut box, pressure transmission plate and water storage case.Water storage case is with down cut box, be all connected by fixed pin between down cut box with upper shear box.Down cut box is bottomless, is placed on water storage case and coordinates with its round boss.Sidewall bottom in down cut box has scupper, and the top of scupper is higher than water storage case round boss.
Direct shear test step is as follows: be 1. fixed on water storage case by down cut box, aims at upper and lower shear box, inserts fixed pin, puts into porous disc and filter paper in down cut box; 2. load soil sample, soil sample is placed filter paper and porous disc; 3. make shear box front end just with force gauge contacts, adjustment dynamometer reading is zero, adds pressure transmission plate, increased pressure frame in turn; 4. apply pressure at right angle by press perpendicular equipment, at this moment, the portion of water in soil sample, through porous disc, drains in water storage case by scupper; 5. take out the fixed pin between upper and lower shear box, zeroing dynamometer, applying horizontal thrust by shearing gearing to down cut box, making soil sample produce detrusion on the horizontal contact face of upper and lower shear box, until destroy, record dynamometer reading and displacement vector.
When loading soil sample, the operation of cohesive soil is, direct cutting ring cuts out circular native cake from clay sample, then cutting ring cutting edge is upwards aimed at upper shear box mouth, soil sample puts porous disc, slowly pushed in shear box by native cake.Owing to being very easily disturbed when original state sandy soil samples, when sampling, soil sample easily glides along cutting ring wall, causes soil sample to be missed, and soil sample can not be pushed in shear box when therefore carrying out direct shear test to sandy soil as cohesive soil with cutting ring direct sample.When existing direct shear test is tested sandy soil, often according to height and the density of soil sample control loading sand sample quality of shear box, after hitting real (or compacting) to specified altitude, carry out shear test.Like this, the original traits of sandy soil is interfered, and the stress of soil sample is affected, and finally causes the sand shear strength parameter index that measures inaccurate, can not the original state character of complete reflection sandy soil.
Summary of the invention
The object of this invention is to provide a kind of shear box group of original state sandy soil direct shear test.Adopt this shear box group to carry out the sandy soil preparation of soil sample and shear test, do not destroy the original state character of sandy soil, easy to operate, matching is good, and test findings is accurate.
The present invention realizes the technical scheme that its goal of the invention takes: a kind of shear box group for original state sandy soil direct shear test, comprise water storage case, down cut box, lower porous disc, lower filter paper, upper shear box, upper filter paper, upper porous disc, pressure transmission plate from bottom to up, the sidewall bottom of described down cut box has scupper, and its design feature is:
Be provided with base plate in described down cut box, described base plate is positioned at below lower porous disc;
The inwall of described down cut box is close to the bottom of combined type cutting ring, and the inwall of upper shear box is close to the top of combined type cutting ring; The bottom of described combined type cutting ring is identical with top cutter wall thickness, connected, and the bottom of combined type cutting ring and the junction on top flushes with the intersection of down cut box and upper shear box by the fixed pin be embedded in cutter wall;
The external diameter of the upper porous disc in described upper shear box is equal with the internal diameter of combined type cutting ring.
The course of work of the present invention and principle are:
One, sample, can according to existing original state sand extractor sampling, only change the cutting ring in existing original state sand extractor into combined type cutting ring, the soil sample of getting is arranged in combined type cutting ring, and combined type cutting ring is placed on a cover plate; Also can with the direct sample of combined type cutting ring: separable ring edge side is vertically pressed into the soil body, until sand gives prominence to combined type cutting ring non-blade port side, strike off the soil body higher than combined type cutting ring non-blade port side, then cover cover plate, subsequently, with supporting plate from lower than separable ring edge incision soil sample, hold combined type cutting ring and cover plate, then horizontal of reversing together, remove supporting plate, strike off separable ring edge side soil sample, by soil sample outside the clean combined type cutting ring of hairbrush, namely complete the sampling of original state sandy soil.
Two, dress sample: put down filter paper and lower porous disc on soil sample surface successively, by the down cut box upset bonnet of band base plate in soil sample, makes combined type cutting ring and soil sample enter in down cut box until base plate; By down cut box, combined type cutting ring and in soil sample, cover plate to reverse together horizontal, remove cover plate, namely complete the preparation of shearing soil sample; Down cut box is fixed in water storage case, upper shear box is inserted in combined type cutting ring top, and aims at down cut box, the fixed pin of shear box and down cut box in insertion, then lay down the fixed pin of combined type cutting ring.
Three, test: sand soil sample upper surface place successively filter paper, on porous disc, pressure transmission plate, apply certain pressure at right angle by press perpendicular equipment; Finally take out the fixed pin between upper and lower shear box, zeroing dynamometer, by shearing gearing, horizontal thrust is applied to down cut box, drive combined type cutting ring bottom and soil sample wherein in down cut box, soil sample is made to produce detrusion on the horizontal contact face of upper and lower shear box (upper and lower of combined type cutting ring), until destroy, record dynamometer reading and displacement vector.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is after sampling, the down cut box that combined type cutting ring is directly placed in band base plate need not take out again, band cutting ring can be realized shear in shear test, effectively solve the problem how got original state sand sample enters shear box, whole process of the test continuity is good, each component matching of test unit is good, and the original state sandy soil shear strength parameter index of test determination is comparatively accurate.
Further, the base plate of down cut box of the present invention is waterproof base plate, and the top of the scupper of the sidewall bottom in described down cut box is higher than the upper surface of base plate.
Like this, when applying pressure at right angle to soil sample, the portion of water in soil sample easily through porous disc, can be drained in water storage case by scupper
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 be the embodiment of the present invention one face structural representation.
Fig. 2 is the plan structure schematic diagram of the embodiment of the present invention one.
Fig. 3 is A-A sectional structure schematic diagram in Fig. 2.
Fig. 4 is the combined type cutting ring plan structure signal in the embodiment of the present invention one.
Fig. 5 is B-B sectional structure schematic diagram in Fig. 4.
In figure, 11 is the fixed pin between down cut box and water storage case, and 12 is the fixed pin between down cut box and upper shear box, and 13 is the handle that down cut outer box wall is arranged.
Embodiment
Embodiment one
Fig. 1-5 illustrates, a kind of embodiment of the present invention is: a kind of shear box group for original state sandy soil direct shear test, comprise water storage case 1, down cut box 2, lower porous disc 3, lower filter paper 4, upper shear box 5, upper filter paper 6, upper porous disc 7, pressure transmission plate 8 from bottom to up, the sidewall bottom of described down cut box 2 has scupper 2a, and its design feature is:
Be provided with base plate 2b in described down cut box 2, described base plate 2b is positioned at below lower porous disc 3;
The inwall of described down cut box 2 is close to the bottom 9a of combined type cutting ring 9, and the inwall of upper shear box 5 is close to the top 9b of combined type cutting ring 9; The bottom 9a of described combined type cutting ring 9 is identical with top 9b cutter wall thickness, connected, and the junction of the bottom 9a of combined type cutting ring 9 and top 9b flushes with the intersection of down cut box 2 and upper shear box 5 by the fixed pin 10 be embedded in cutter wall;
The external diameter of the upper porous disc 7 in described upper shear box 5 is equal with the internal diameter of combined type cutting ring 9.
The base plate 2b of the box of down cut described in this example 2 is waterproof base plate, and the top of the scupper 2a of the sample aperture sidewall bottom of described down cut box 2 is higher than the upper surface of base plate 2b.
Embodiment two
A kind of shear box group for original state sandy soil direct shear test, comprise water storage case 1, down cut box 2, lower porous disc 3, lower filter paper 4, upper shear box 5, upper filter paper 6, upper porous disc 7, pressure transmission plate 8 from bottom to up, the sidewall bottom of described down cut box 2 has scupper 2a, and its design feature is:
Be provided with the base plate 2b of porous in described down cut box 2, described base plate 2b is positioned at below lower porous disc 3;
The inwall of described down cut box 2 is close to the bottom 9a of combined type cutting ring 9, and the inwall of upper shear box 5 is close to the top 9b of combined type cutting ring 9; The bottom 9a of described combined type cutting ring 9 is identical with top 9b cutter wall thickness, connected, and the junction of the bottom 9a of combined type cutting ring 9 and top 9b flushes with the intersection of down cut box 2 and upper shear box 5 by the fixed pin 10 be embedded in cutter wall;
The external diameter of the upper porous disc 7 in described upper shear box 5 is equal with the internal diameter of combined type cutting ring 9.
Claims (2)
1. the shear box group for original state sandy soil direct shear test, comprise water storage case (1), down cut box (2), lower porous disc (3), lower filter paper (4), upper shear box (5), upper filter paper (6), upper porous disc (7) and pressure transmission plate (8) from bottom to up, the sidewall bottom of described down cut box (2) has scupper (2a), it is characterized in that:
Be provided with base plate (2b) in described down cut box (2), described base plate (2b) is positioned at lower porous disc (3) below;
The inwall of described down cut box (2) is close to the bottom (9a) of combined type cutting ring (9), and the inwall of upper shear box (5) is close to the top (9b) of combined type cutting ring (9); The bottom (9a) of described combined type cutting ring (9) is identical with top (9b) cutter wall thickness, connected by the fixed pin (10) be embedded in cutter wall, and the junction of the bottom (9a) of combined type cutting ring (9) and top (9b) flushes with the intersection of down cut box (2) and upper shear box (5);
The external diameter of the upper porous disc (7) in described upper shear box (5) is equal with the internal diameter of combined type cutting ring (9).
2. a kind of shear box group for original state sandy soil direct shear test according to claims 1, it is characterized in that: the base plate (2b) of described down cut box (2) is waterproof base plate, the top of the scupper (2a) of the sidewall bottom in described down cut box (2) is higher than the upper surface of base plate (2b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510142617.1A CN104792608A (en) | 2015-03-30 | 2015-03-30 | Shear box group for direct shear test of undisturbed sandy soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510142617.1A CN104792608A (en) | 2015-03-30 | 2015-03-30 | Shear box group for direct shear test of undisturbed sandy soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104792608A true CN104792608A (en) | 2015-07-22 |
Family
ID=53557598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510142617.1A Pending CN104792608A (en) | 2015-03-30 | 2015-03-30 | Shear box group for direct shear test of undisturbed sandy soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104792608A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124341A (en) * | 2016-06-20 | 2016-11-16 | 三峡大学 | The field direct shear test sample preparation of a kind of Tu Yan interface and assay device |
| CN108489782A (en) * | 2018-03-16 | 2018-09-04 | 郑州大学 | A kind of the direct shear test sample preparation device and its application method of infiltration type slip casting solidified earth |
| CN110174350A (en) * | 2019-06-12 | 2019-08-27 | 湖北省路桥集团有限公司 | A kind of test device and test method of clay true cohesion |
| CN113029821A (en) * | 2021-03-31 | 2021-06-25 | 重庆科创职业学院 | Direct shear box for researching mechanical characteristics of contact surface |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU953085A1 (en) * | 1980-12-01 | 1982-08-23 | Предприятие П/Я М-5828 | Apparatus for shear testing of soil |
| SU1392200A1 (en) * | 1986-11-03 | 1988-04-30 | Ивано-Франковский Филиал Республиканского Проектно-Изыскательского Института "Укрремдорпроект" | Apparatus for shear testing of soil |
| CN101105433A (en) * | 2007-07-26 | 2008-01-16 | 河海大学 | Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method |
| CN203101095U (en) * | 2012-12-11 | 2013-07-31 | 长安大学 | Dual-layer soil sampling ring knife |
| CN103712840A (en) * | 2014-01-01 | 2014-04-09 | 浙江省建设工程质量检验站有限公司 | Static shearing test sample making instrument and making method thereof |
| CN203908886U (en) * | 2014-05-21 | 2014-10-29 | 广州市市政工程设计研究院 | Direct shear apparatus with constant shearing surface |
| CN204536105U (en) * | 2015-03-30 | 2015-08-05 | 西南交通大学 | A kind of shear box group for original state sandy soil direct shear test |
-
2015
- 2015-03-30 CN CN201510142617.1A patent/CN104792608A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU953085A1 (en) * | 1980-12-01 | 1982-08-23 | Предприятие П/Я М-5828 | Apparatus for shear testing of soil |
| SU1392200A1 (en) * | 1986-11-03 | 1988-04-30 | Ивано-Франковский Филиал Республиканского Проектно-Изыскательского Института "Укрремдорпроект" | Apparatus for shear testing of soil |
| CN101105433A (en) * | 2007-07-26 | 2008-01-16 | 河海大学 | Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method |
| CN203101095U (en) * | 2012-12-11 | 2013-07-31 | 长安大学 | Dual-layer soil sampling ring knife |
| CN103712840A (en) * | 2014-01-01 | 2014-04-09 | 浙江省建设工程质量检验站有限公司 | Static shearing test sample making instrument and making method thereof |
| CN203908886U (en) * | 2014-05-21 | 2014-10-29 | 广州市市政工程设计研究院 | Direct shear apparatus with constant shearing surface |
| CN204536105U (en) * | 2015-03-30 | 2015-08-05 | 西南交通大学 | A kind of shear box group for original state sandy soil direct shear test |
Non-Patent Citations (1)
| Title |
|---|
| 阮波,张向京.: "《土力学实验》", 31 December 2009 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124341A (en) * | 2016-06-20 | 2016-11-16 | 三峡大学 | The field direct shear test sample preparation of a kind of Tu Yan interface and assay device |
| CN108489782A (en) * | 2018-03-16 | 2018-09-04 | 郑州大学 | A kind of the direct shear test sample preparation device and its application method of infiltration type slip casting solidified earth |
| CN110174350A (en) * | 2019-06-12 | 2019-08-27 | 湖北省路桥集团有限公司 | A kind of test device and test method of clay true cohesion |
| CN110174350B (en) * | 2019-06-12 | 2021-11-26 | 湖北省路桥集团有限公司 | Testing device and testing method for clay true cohesive force |
| CN113029821A (en) * | 2021-03-31 | 2021-06-25 | 重庆科创职业学院 | Direct shear box for researching mechanical characteristics of contact surface |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204536105U (en) | A kind of shear box group for original state sandy soil direct shear test | |
| CN204536104U (en) | A kind of upper and lower stacked cutting ring for direct shear test | |
| CN104792608A (en) | Shear box group for direct shear test of undisturbed sandy soil | |
| CN102323104B (en) | Primary state soil sampler for loose sandy soil | |
| CN109884276B (en) | Layered soil humidity synchronous measuring device | |
| CN102518107B (en) | Environmental geotechnical piezocone penetration test probe capable of extracting gas samples and gas sample extracting method | |
| CN102495194A (en) | Backpressure-applied consolidation test device with constant strain rate and test method of backpressure-applied consolidation test device | |
| CN110455712B (en) | Sample preparation device and test method for measuring adhesion force between special curved surface and soil interface by inverted sample preparation | |
| CN202304715U (en) | Caliper for measuring embedded depth of electric pole | |
| CN203365432U (en) | Soil-water characteristic curve testing instrument applicable to special coarse-grained soil | |
| CN203249808U (en) | Sample splitter for soil sampling | |
| CN108344594A (en) | A kind of ring shear test undisturbed soil sample sample preparation device and method | |
| CN204703203U (en) | Pit accident bath scaled model experimental device | |
| CN205301036U (en) | System appearance ware suitable for indoor geotechnological permeability test | |
| CN102912781A (en) | Loose sand cutting ring sampling method | |
| CN110004904A (en) | A kind of soil sampler for static cone penetration equipment | |
| CN207114223U (en) | A kind of food inspection different depth sampler | |
| CN206440519U (en) | A kind of light-duty manipulated soil staight scissors sample making device | |
| CN106441990B (en) | Soil body mercury-pressing test sample sampler | |
| CN109655377A (en) | Portable snow layer density measuring device and use method | |
| CN211602482U (en) | Soil cutting ring | |
| CN211596724U (en) | Railway roadbed compactness detects sampler | |
| CN206311374U (en) | For the sample soil sampler of cohesive soil combined measurement method of liquid and plastic limits experiment | |
| CN208254936U (en) | A kind of visualization sample box for laboratory soil test | |
| CN213544069U (en) | A novel wooden sampler for top layer soil sample |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150722 |