CN103257082B - Method of reducing sample disturbances of direct shear test and cutting ring - Google Patents
Method of reducing sample disturbances of direct shear test and cutting ring Download PDFInfo
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- CN103257082B CN103257082B CN201210034849.1A CN201210034849A CN103257082B CN 103257082 B CN103257082 B CN 103257082B CN 201210034849 A CN201210034849 A CN 201210034849A CN 103257082 B CN103257082 B CN 103257082B
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- cutting ring
- sample
- box
- shear
- shear test
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- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 230000006378 damage Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a method of reducing sample disturbances of a direct shear test. The method comprises using a movable cutting ring to prepare original soil samples suitable for a direct shearing device, aligning upper and lower boxes, inserting a fixed pin, putting a clean permeable stone and a wet filter paper in the lower box, aligning the movable cutting ring filled with samples at the upper box of the shearing box in a way that a flat end is downward and a cutting edge is upward, putting a wet filter paper and a permeable stone on the samples, loosing the cutting ring, slowly pressing the samples to the bottom of the shearing box by using the permeable stone, sequentially adding a pressure transmission piston and a pressurization framework, and finally applying different vertical pressures to test. According to the invention, a direct shear test for soil body can be simply and rapidly carried out, and disturbances of the soil body on soil samples when the soil body is moved from the cutting ring to the shearing box can be reduced, thereby improving precision of the direct shear test for the soil body. The method is suitable for buildings, roads, bridges, water conservancy and harbour engineering.
Description
Technical field
The invention belongs to field of civil engineering, be specifically related to a kind of method and the cutting ring that reduce the disturbance of direct shear test sample.
Background technology
Soil classifiction refers to the limit resistivity of the shear stress that the soil body produces for external load.The shear stress produced by external force when certain point in soil reaches soil classifiction, when a part for the soil body moves relative to another part, just thinks that this point there occurs shear failure.Shear failure is the important feature of strength failure, and strength problem is most important substance in soil mechanics.Up to now, relevant with intensity engineering problem mainly contains: the stable problem of the earthen structure that (1) soil is formed as material; (2) the native environmental problem as engineering structure and Earth pressures; (3) soil is as the Carrying Capacity etc. of structure foundation.
If the lower foundation soil body in basis produces whole slide or the development of partial cut district causes excessive even not uniform foundation deformation, all can cause the destruction of superstructure or occur the normal accident used of impact.So the strength detection of soil and principle thereof provide foundation and parameter by for the design of civil engineering work and checking computations.
The method of test soil shear strength is more, generally determines test method according to the scope of application of test apparatus.For direct shear test, proper test method(s) is slow shear and Drainage Shear test.Because shear box has gap between box up and down, for not Drainage Shear and consolidation not Drainage Shear test, have no idea to make its absolutely not draining in shear history.The test method of direct shear test generally with cutting soon, consolidated quick shear and slow shear represent.
According to the observation, when sample being pressed into shear box from cutting ring, the sample damage more and less to water cut is larger.The present invention greatly can reduce the damage of sample in direct shear test process, improves test accuracy.
Summary of the invention
The technical problem to be solved in the present invention solves existing test method to sample damage comparatively greatly, and the technical matters that test accuracy is lower, reduces the disturbance of direct shear test sample, provide a kind of method and the cutting ring that reduce the disturbance of direct shear test sample.
For achieving the above object, the technical solution used in the present invention is as follows:
The method of reduction direct shear test sample of the present invention disturbance, produces the original-pack soil sample being applicable to direct shear apparatus with movable cutting ring; Aim at upper and lower box, insert fixing pin, clean permeable stone one piece and wet filter paper one is put in lower box, the movable cutting ring filling sample, flat mouth down up-bite jaw aligns the upper box of shear box, on sample, moisture releasing filter paper one and permeable stone one piece, then loosen cutting ring, is slowly pressed at the bottom of shear box by sample permeable stone; And add pressure transmission piston and increased pressure frame successively, finally apply different pressure at right angles and test.
The method of reduction direct shear test sample of the present invention disturbance, specifically comprises the following steps:
(1) the producing of original-pack sample: get movable cutting ring, choose target soil layer, press-in cutting ring, above goes down flat;
(2) installation of sample: the movable cutting ring filling sample, flat mouth down up-bite jaw aligns the upper box of shear box, then loosens cutting ring, is slowly pressed at the bottom of shear box by sample permeable stone, and adds pressure transmission piston and increased pressure frame successively;
(3) shear test: according to testing requirements, applies different vertical pressure, after sample compression is stable, strain circle is installed, slowly rotates handwheel, the steel ball of box is enclosed with strain and contacts, record dial gauge reading, unclamp four screw rods in outside, take out inner face pin, start motor, make strain circle pressurized, observe and record dial gauge reading change, pointer stop maybe turning, continue shear 4mm; Pointer continues to advance, and shears 6mm, writes down final reading, close down motor.
The movable cutting ring of reduction direct shear test sample of the present invention disturbance, comprise cutter ring and blade, one end of the sidewall of described movable cutting ring rotates knot I by round and smooth the connecting to form of the camber line that radius is different, the other end is provided with and rotates the rotation that knot I is interlocked and tie II, and the sidewall two ends of cutting ring are knotted by rotation and connect.
Method of the present invention is the original-pack soil sample produced with movable cutting ring, the movable cutting ring filling sample, flat mouth down up-bite jaw aligns the upper box of shear box, then cutting ring is loosened, sample permeable stone is pressed at the bottom of shear box slowly, and add pressure transmission piston and increased pressure frame successively, finally apply different pressure at right angles and test.There is the advantage that thinking is distinct, test accuracy is high, be easy to operation.
Accompanying drawing explanation
Fig. 1 is movable cutting ring schematic diagram of the present invention.
Embodiment
The movable cutting ring of reduction direct shear test sample of the present invention disturbance, comprise cutter ring 1 and blade 2, one end of the sidewall of described movable cutting ring rotates knot I 1-1 by round and smooth the connecting to form of the camber line that radius is different, the other end is provided with and rotates the rotation that knot I 1-1 is interlocked and tie II 1-2, and the sidewall two ends of cutting ring are knotted by rotation and connect.
The method of reduction direct shear test sample of the present invention disturbance, its embodiment comprises the producing of original-pack sample, the installation of sample and shear test three processes:
(1) the producing of original-pack sample: get movable cutting ring, choose target soil layer, press-in cutting ring, above goes down flat.
(2) installation of sample: the movable cutting ring filling sample, flat mouth down up-bite jaw aligns the upper box of shear box, then loosens cutting ring, is slowly pressed at the bottom of shear box by sample permeable stone, and adds pressure transmission piston and increased pressure frame successively.
(3) shear test: according to testing requirements, applies different vertical pressure.After sample compression is stable, strain circle is installed, slowly rotates handwheel, the steel ball of box is enclosed with strain and contacts, record dial gauge reading.Unclamp outside four screw rods, take out inner face pin, start motor, make strain circle pressurized, observe and record dial gauge reading change, pointer stop maybe turning, continue shearing 4mm; Pointer continues to advance, and shears 6mm, writes down final reading, close down motor.
Claims (2)
1. reduce a method for direct shear test sample disturbance, it is characterized in that: produce the original-pack soil sample being applicable to direct shear apparatus with movable cutting ring; Aim at upper and lower box, insert fixing pin, clean permeable stone one piece and wet filter paper one is put in lower box, the movable cutting ring filling sample, flat mouth down up-bite jaw aligns the upper box of shear box, on sample, moisture releasing filter paper one and permeable stone one piece, then loosen cutting ring, is slowly pressed at the bottom of shear box by sample permeable stone; And add pressure transmission piston and increased pressure frame successively, finally apply different pressure at right angles and test; One end of the sidewall of described movable cutting ring rotates knot I by round and smooth the connecting to form of the camber line that radius is different, and the other end is provided with and rotates the rotation that knot I is interlocked and tie II, and the sidewall two ends of cutting ring are knotted by rotation and connect.
2. the method for reduction direct shear test sample according to claim 1 disturbance, is characterized in that comprising the following steps:
(1) the producing of original-pack sample: get movable cutting ring, choose target soil layer, press-in cutting ring, above goes down flat;
(2) installation of sample: the movable cutting ring filling sample, flat mouth down up-bite jaw aligns the upper box of shear box, then loosens cutting ring, is slowly pressed at the bottom of shear box by sample permeable stone, and adds pressure transmission piston and increased pressure frame successively;
(3) shear test: according to testing requirements, applies different vertical pressure, after sample compression is stable, strain circle is installed, slowly rotates handwheel, the steel ball of box is enclosed with strain and contacts, record dial gauge reading, unclamp four screw rods in outside, take out inner face pin, start motor, make strain circle pressurized, observe and record dial gauge reading change, pointer stop maybe turning, continue shear 4mm; Pointer continues to advance, and shears 6mm, writes down final reading, close down motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210034849.1A CN103257082B (en) | 2012-02-16 | 2012-02-16 | Method of reducing sample disturbances of direct shear test and cutting ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210034849.1A CN103257082B (en) | 2012-02-16 | 2012-02-16 | Method of reducing sample disturbances of direct shear test and cutting ring |
Publications (2)
| Publication Number | Publication Date |
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| CN103257082A CN103257082A (en) | 2013-08-21 |
| CN103257082B true CN103257082B (en) | 2015-07-01 |
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| CN201210034849.1A Expired - Fee Related CN103257082B (en) | 2012-02-16 | 2012-02-16 | Method of reducing sample disturbances of direct shear test and cutting ring |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716939A (en) * | 2016-04-01 | 2016-06-29 | 桂林理工大学 | Device for performing wetting-drying circulation and direct shear test for simulation of soil bearing load condition |
| CN105865938A (en) * | 2016-04-01 | 2016-08-17 | 桂林理工大学 | Method for conducting dry-wet cycle and direct shear test on simulated load-bearing soil |
| CN106442035B (en) * | 2016-05-18 | 2023-08-01 | 中国能源建设集团甘肃省电力设计院有限公司 | Device and method for manufacturing direct shear test sample of concrete-frozen soil contact surface |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201327472Y (en) * | 2008-12-02 | 2009-10-14 | 上海海事大学 | Direct shear apparatus for meso-structure |
| CN101863073A (en) * | 2010-05-21 | 2010-10-20 | 中国地质大学（武汉） | Multifunctional joint sampling instrument for undisturbed soil |
| CN101915721A (en) * | 2010-06-24 | 2010-12-15 | 同济大学 | Test method for simulating variation of permeability coefficient of foundation pit precipitation soil |
| CN101949805A (en) * | 2010-09-15 | 2011-01-19 | 上海岩土工程勘察设计研究院有限公司 | Method for testing physical and mechanical properties of acid contaminated soil |
| CN102252867A (en) * | 2011-07-14 | 2011-11-23 | 华南农业大学 | Ring-knife soil sampler and use method thereof |
-
2012
- 2012-02-16 CN CN201210034849.1A patent/CN103257082B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201327472Y (en) * | 2008-12-02 | 2009-10-14 | 上海海事大学 | Direct shear apparatus for meso-structure |
| CN101863073A (en) * | 2010-05-21 | 2010-10-20 | 中国地质大学（武汉） | Multifunctional joint sampling instrument for undisturbed soil |
| CN101915721A (en) * | 2010-06-24 | 2010-12-15 | 同济大学 | Test method for simulating variation of permeability coefficient of foundation pit precipitation soil |
| CN101949805A (en) * | 2010-09-15 | 2011-01-19 | 上海岩土工程勘察设计研究院有限公司 | Method for testing physical and mechanical properties of acid contaminated soil |
| CN102252867A (en) * | 2011-07-14 | 2011-11-23 | 华南农业大学 | Ring-knife soil sampler and use method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李志斌.土工织物膨润土垫防渗有效性研究及相关机理分析.《中国优秀博硕士学位论文全文数据库(博士) 工程科技Ⅱ辑》.2007, * |
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| CN103257082A (en) | 2013-08-21 |
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