CN105716939A - Device for performing wetting-drying circulation and direct shear test for simulation of soil bearing load condition - Google Patents
Device for performing wetting-drying circulation and direct shear test for simulation of soil bearing load condition Download PDFInfo
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- CN105716939A CN105716939A CN201610199720.4A CN201610199720A CN105716939A CN 105716939 A CN105716939 A CN 105716939A CN 201610199720 A CN201610199720 A CN 201610199720A CN 105716939 A CN105716939 A CN 105716939A
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- shear box
- cutting ring
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- cover plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention discloses a device for performing wetting-drying circulation and a direct shear test for simulation of soil bearing load condition. The device comprises a wetting-drying circulation device and a shear box, wherein the wetting-drying circulation device comprises nuts, a fixing ring, vertical rods, a lower bottom plate, lower bottom plate drain holes, a cutting ring, a cutting ring clamp buckle, a cross ridge, an upper cover plate and upper cover drain holes, the shear box comprises an upper shear box, a lower shear box and a shear box base, threads are attached to the whole length of the vertical rods, and the vertical rods are fixedly connected with the lower bottom plate; the upper end of the cross ridge on the upper cover plate is larger than the outer diameter of the fixing ring by 1 cm; the diameter of the upper cover plate is slightly smaller than the inner diameter of the cutting ring; a linear distance between the vertical rods in diagonal positions is slightly larger than the diameter of the experimental cutting ring; the shear box is specially designed according to the wetting-drying circulation device and comprises the base, the lower shear box and the upper shear box, the circulation device can be directly mounted in the shear box for the shear test, and sample dismounting is not required. The device material is cheap, the operation is simple and convenient, the simulated force condition is close to engineering practice, and the device is easy to master and facilitates engineering application.
Description
Technical field
The invention belongs to Geotechnical Engineering test and engineering application technical field, particularly to a kind of device simulated and carry out drying and watering cycle and direct shear test in soil body bearing load situation.
Background technology
The character such as the intensity of the soil body, modulus are had appreciable impact by drying and watering cycle effect, and soil body drying and watering cycle is also one of problem of Geotechnical Engineering extensive concern.Research currently for soil body drying and watering cycle process carries out mainly through large volume model experiment and the experiment of laboratory small volumes of sample.And earth stress situation that current experimental provision is simulated is actual with engineering differs bigger, it is primarily present following limitation: (1) sample drying and watering cycle process carries out in direct shear apparatus shear box, moisture content is by the sample measurement after failure by shear, it is impossible to accurate Control Assay moisture content in real time；And sample parcel is tight, drying and watering cycle process is slow；(2) sample is without carrying out drying and watering cycle process under restrained condition, first makes relatively bulk specimen, and drying and watering cycle makes cutting ring sample again after completing, sample is formed repeatedly disturbance, affects experimental result；(3) utilize cutting ring and vertical counterweight Simulation Study On Pressure actual loading, but cyclic process is laid down vertical load and weighs to control moisture content, cyclic process exists off-load, and when being installed on direct shear apparatus after having circulated, sample disturbance is bigger.
Summary of the invention
It is an object of the invention to provide a kind of device simulated and carry out drying and watering cycle and direct shear test in soil body bearing load situation, with the problem solving to propose in above-mentioned background technology.
The present invention is achieved in that a kind of device simulated and carry out drying and watering cycle and direct shear test in soil body bearing load situation, being made up of wetting and drying cycle apparatus and shear box, wetting and drying cycle apparatus includes nut, retainer ring, vertical rod, lower shoe, lower shoe osculum, cutting ring, cutting ring buckle, decussation rib, upper cover plate, upper cover plate osculum；Cutting ring is equally divided into upper and lower two halves, has screw thread bottom lower half, and the two halves up and down of cutting ring can be fixed as a whole with cutting ring buckle；Lower shoe is provided with groove and lower shoe osculum, and groove inner wall has screw thread, can screw up with cutting ring lower half bottom thread；Vertical rod and lower shoe are fixedly linked and vertical rod total length is with screw thread；Upper cover plate is provided with decussation rib and upper cover plate osculum, big 1 centimetre than retainer ring external diameter, the upper end of decussation rib；Upper cover plate diameter is slightly less than cutting ring internal diameter；Air line distance between the vertical rod of diagonal position is slightly larger than cutting ring diameter；Shear box is made up of shear box base, down cut box and upper shear box three part；Wetting and drying cycle apparatus is able to fit directly in shear box and carries out direct shear test, it is not necessary to tear sample open.
Described wetting and drying cycle apparatus adopts the material that intensity is high, density is little to make, and shear box adopts aluminium to make.
Described wetting and drying cycle apparatus preferentially adopts PEEK plastics or aluminium to make.
The present invention occurs without unloading again from sample preparation to drying and watering cycle in the whole process of failure by shear, and can more accurate Control experiment water-cut variation, with timer material cheap and simple, easy and simple to handle, simulation stressing conditions is actual close to engineering, easily grasp, is easy to engineering application.
Accompanying drawing explanation
Fig. 1 is the retainer ring front view of device in the embodiment of the present invention.
Fig. 2 is the retainer ring top view of device in the embodiment of the present invention.
Fig. 3 is upper cover plate and the decussation rib front view of device in the embodiment of the present invention.
Fig. 4 is upper cover plate and the decussation rib top view of device in the embodiment of the present invention.
Fig. 5 is the device schematic diagram in the embodiment of the present invention for vertical strain testing.
Fig. 6 is the device schematic diagram of cutting ring and lower shoe in the embodiment of the present invention.
Fig. 7 is the device schematic diagram of shear box base in the embodiment of the present invention.
Fig. 8 is the device schematic diagram of upper and lower shear box in the embodiment of the present invention.
Labelling in figure: 1-nut；2-retainer ring；3-vertical rod；4-lower shoe；5-lower shoe osculum；6-cutting ring；7-decussation rib；8-upper cover plate；9-upper cover plate osculum；10-dial gauge；11-Magnetic gauge stand；12-sample；13-cutting ring buckle；14-shear box base；15-down cut box groove；16-lower shoe stopper slot；17-down cut box；The upper shear box of 18-.
Detailed description of the invention
Below in conjunction with accompanying drawing, presently preferred embodiments of the present invention is described in detail, is readily appreciated by one skilled in the art so that advantages and features of the invention can be more easy to, thus protection scope of the present invention being made apparent clear and definite defining.
Embodiment:
A kind of simulate the device carrying out drying and watering cycle and direct shear test in soil body bearing load situation, being made up of wetting and drying cycle apparatus and shear box, wetting and drying cycle apparatus includes nut 1, retainer ring 2, vertical rod 3, lower shoe 4, lower shoe osculum 5, cutting ring 6, cutting ring buckle 13, decussation rib 7, upper cover plate 8 and upper cover plate osculum 9；Cutting ring 6 is equally divided into upper and lower two halves, has screw thread bottom lower half, and the two halves up and down of cutting ring 6 can be fixed as a whole with cutting ring buckle 13；Lower shoe 4 is provided with groove and lower shoe osculum 5, and groove inner wall has screw thread, can screw up with cutting ring 6 lower half bottom thread；Vertical rod 3 and lower shoe 4 are fixedly linked and vertical rod 3 total length is with screw thread；Upper cover plate 8 is provided with decussation rib 7 and upper cover plate osculum, bigger than retainer ring 2 external diameter 1 centimetre of the upper end of decussation rib；Upper cover plate 8 diameter is slightly less than cutting ring 6 internal diameter；Air line distance between the vertical rod 3 of diagonal position is slightly larger than cutting ring 6 diameter；Shear box is made up of shear box base 14, down cut box 17 and upper shear box 18 3 part；Wetting and drying cycle apparatus is able to fit directly in shear box and carries out direct shear test, it is not necessary to tear sample open.
Described wetting and drying cycle apparatus adopts PEEK plastic production, and shear box adopts aluminium to make.
The device of the present embodiment is tested according to following steps:
First, the sample 12 of required moisture content is made according to planning of experiment, sample 12 upper and lower surface respectively puts the silk quality gauze that two-layer is big with sample 12 grade, to prevent grogs to run off, is put on lower shoe 4 by sample 12 together with cutting ring 6, cutting ring 6 and lower shoe 4 is tightened.
Second, by upper cover plate 8 cover alignment to sample 12, retainer ring 2 is put on upper cover plate 8 through vertical rod 3, and nut 1 is screwed to vertical rod 3 apical position, and the weight weighing whole device is designated as M0.
3rd, as it is shown in figure 5, be arranged on the decussation rib 7 of upper cover plate 8 by the measuring head of dial gauge 10, and initial value is set, measures the vertical strain of sample 12 with this.
4th, class of loading requirement according to planning of experiment, pressure is applied with counterweight preloading on the decussation rib 7 of upper cover plate 8, when sample 12 is compressed by vertical load, retainer ring 2 is with upper cover plate 8 slide downward, now namely sample 12 is subject to hoop constraint power, is subject to again vertical pressure, better simulates engineering actual loading situation.
5th, simulation soil body dehydration process realizes by controlling soil moisture content, is placed in climatic chamber by device and allows the moisture of sample 12 evaporate, and the numerical value recording dial gauge 10 at regular intervals the weight measuring sample 12 are to calculate the moisture content of now sample 12.
6th, when weighing, remove dial gauge 10, nut 1 is screwed to along vertical rod 3 and is in close contact with retainer ring 2, to prevent from shedding sample 12 resilience after counterweight vertical load；Unloading the load on upper cover plate 8, be placed on by whole device on balance and weigh mass M 1, the difference weighed for twice is M0-M1, is soil body moisture variable quantity, thus calculating the water-cut variation situation of sample 12；Due to the constraint of retainer ring 2, upper cover plate 8 can not resilience, when weighing, sample 12 is still in pressured state, and whole process is absent from unloading.
7th, during simulation soil body water absorption course, will be immersed in the water by the sample under load action, make moisture be fully infiltrated into sample 12；Record the numerical value of dial gauge 10 moisture content of calculating sample 12 of weighing with method described in the 6th step at regular intervals, thus reaching to carry out soil body dry and wet experiment in accurately control moisture content situation.
8th, after the drying and watering cycle process hit the target, remove dial gauge 10, nut 1 is screwed to along vertical rod 3 and is in close contact with retainer ring 2, to prevent from shedding sample 12 resilience after counterweight vertical load；Unloading the load on upper cover plate 8, circulating device loaded in special shear box base 14, lower shoe 4 contacts tightly with lower shoe stopper slot 16.
9th, according to finder charge requirement, the decussation rib 7 of upper cover plate 8 applies corresponding load；Remove the cutting ring buckle 13 of cutting ring 6, down cut box 17 and upper shear box 18 are installed.
Tenth, regulate direct shear apparatus dial gauge, carry out direct shear test.
Claims (2)
1. simulate the device carrying out drying and watering cycle and direct shear test in soil body bearing load situation for one kind, it is characterized in that this device is made up of wetting and drying cycle apparatus and shear box, wetting and drying cycle apparatus includes nut (1), retainer ring (2), vertical rod (3), lower shoe (4), lower shoe osculum (5), cutting ring (6), cutting ring buckle (13), decussation rib (7), upper cover plate (8), upper cover plate osculum (9)；Cutting ring (6) is equally divided into upper and lower two halves, has screw thread bottom lower half, and the two halves up and down of cutting ring (6) can be fixing as a whole with cutting ring buckle (13)；Lower shoe (4) is provided with groove and lower shoe osculum, and groove inner wall has screw thread, can screw up with cutting ring (6) lower half bottom thread；Vertical rod (3) and lower shoe (4) are fixedly linked and vertical rod (3) total length is with screw thread；Upper cover plate (8) is provided with decussation rib (7) and upper cover plate osculum (9), bigger than retainer ring (2) external diameter 1 centimetre of the upper end of decussation rib (7)；Upper cover plate (8) diameter is slightly less than cutting ring (6) internal diameter；It is positioned at the air line distance between the vertical rod (3) of diagonal position slightly larger than cutting ring (6) diameter；Shear box is made up of shear box base (14), down cut box (17) and upper shear box (18) three part；Wetting and drying cycle apparatus is able to fit directly in shear box and carries out direct shear test, it is not necessary to tear sample open；
Described wetting and drying cycle apparatus adopts the material that intensity is high, density is little to make, and shear box adopts aluminium to make.
2. carry out the device of drying and watering cycle and direct shear test in simulation soil body bearing load situation as claimed in claim 1, it is characterised in that described wetting and drying cycle apparatus adopts PEEK plastics or aluminium to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610199720.4A CN105716939A (en) | 2016-04-01 | 2016-04-01 | Device for performing wetting-drying circulation and direct shear test for simulation of soil bearing load condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610199720.4A CN105716939A (en) | 2016-04-01 | 2016-04-01 | Device for performing wetting-drying circulation and direct shear test for simulation of soil bearing load condition |
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| Publication Number | Publication Date |
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| CN105716939A true CN105716939A (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610199720.4A Pending CN105716939A (en) | 2016-04-01 | 2016-04-01 | Device for performing wetting-drying circulation and direct shear test for simulation of soil bearing load condition |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187918A (en) * | 2018-08-03 | 2019-01-11 | 江南大学 | The staight scissors Sample devices and its application method of wetting-drying test |
| CN109307628A (en) * | 2018-09-29 | 2019-02-05 | 中铁隧道局集团有限公司 | A kind of mud film shear strength test instrument and its method for measuring mud film shearing strength |
| CN109342231A (en) * | 2018-08-27 | 2019-02-15 | 青岛理工大学 | Electrochemical improvement-based seasonal frozen soil comprehensive mechanical testing device and method |
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|---|---|---|---|---|
| CN103257082A (en) * | 2012-02-16 | 2013-08-21 | 中原工学院 | Method of reducing sample disturbances of direct shear test and cutting ring |
| CN203232030U (en) * | 2013-05-08 | 2013-10-09 | 山东大学 | Dry-wet cyclic swelling-shrinkage measuring device for non-load swelling soil |
| CN204536104U (en) * | 2015-03-30 | 2015-08-05 | 西南交通大学 | A kind of upper and lower stacked cutting ring for direct shear test |
| CN105158441A (en) * | 2015-09-19 | 2015-12-16 | 桂林理工大学 | Device for dry-wet cycle under condition of simulating soil bearing in engineering |
| CN105203735A (en) * | 2015-09-19 | 2015-12-30 | 桂林理工大学 | Implementation method of conducting dry-wet cycle by simulating soil body bearing load in engineering |
-
2016
- 2016-04-01 CN CN201610199720.4A patent/CN105716939A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257082A (en) * | 2012-02-16 | 2013-08-21 | 中原工学院 | Method of reducing sample disturbances of direct shear test and cutting ring |
| CN203232030U (en) * | 2013-05-08 | 2013-10-09 | 山东大学 | Dry-wet cyclic swelling-shrinkage measuring device for non-load swelling soil |
| CN204536104U (en) * | 2015-03-30 | 2015-08-05 | 西南交通大学 | A kind of upper and lower stacked cutting ring for direct shear test |
| CN105158441A (en) * | 2015-09-19 | 2015-12-16 | 桂林理工大学 | Device for dry-wet cycle under condition of simulating soil bearing in engineering |
| CN105203735A (en) * | 2015-09-19 | 2015-12-30 | 桂林理工大学 | Implementation method of conducting dry-wet cycle by simulating soil body bearing load in engineering |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109187918A (en) * | 2018-08-03 | 2019-01-11 | 江南大学 | The staight scissors Sample devices and its application method of wetting-drying test |
| CN109187918B (en) * | 2018-08-03 | 2021-03-16 | 江南大学 | Direct shear sample device for dry-wet cycle test and use method thereof |
| CN109342231A (en) * | 2018-08-27 | 2019-02-15 | 青岛理工大学 | Electrochemical improvement-based seasonal frozen soil comprehensive mechanical testing device and method |
| CN109342231B (en) * | 2018-08-27 | 2020-10-16 | 青岛理工大学 | Electrochemical improvement-based seasonal frozen soil comprehensive mechanical testing device and method |
| CN109307628A (en) * | 2018-09-29 | 2019-02-05 | 中铁隧道局集团有限公司 | A kind of mud film shear strength test instrument and its method for measuring mud film shearing strength |
| CN109307628B (en) * | 2018-09-29 | 2024-04-26 | 中铁隧道局集团有限公司 | Mud film shear strength test instrument and mud film shear strength measurement method thereof |
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Application publication date: 20160629 |