CN111796074A - Device capable of testing multidirectional deformation and expansive force of expansive soil - Google Patents
Device capable of testing multidirectional deformation and expansive force of expansive soil Download PDFInfo
- Publication number
- CN111796074A CN111796074A CN202010718361.5A CN202010718361A CN111796074A CN 111796074 A CN111796074 A CN 111796074A CN 202010718361 A CN202010718361 A CN 202010718361A CN 111796074 A CN111796074 A CN 111796074A
- Authority
- CN
- China
- Prior art keywords
- plate
- box body
- sample
- water
- placing chamber
- 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
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The invention discloses a device capable of testing multidirectional deformation and expansive force of expansive soil. The device mainly comprises a test box body, a water injection device and a measuring device, wherein the water injection device and the measuring device are arranged on the test box body, a sample placing chamber is arranged in the test box body, the sample placing chamber is of a square box body structure comprising a bottom plate and four side baffles, a displacement sensor I for measuring horizontal displacement is arranged between the inner wall of the test box body and the side baffles, and a displacement sensor II for measuring vertical displacement is arranged between a cantilever cross rod extending out of the top of the box body and a top plate; when the expansive force test is carried out, the displacement sensor is replaced by a spiral pressurizing rod, and a stress sensor is arranged at the end of the spiral pressurizing rod. The invention has novel structure, simple and convenient installation and convenient operation, and can effectively measure the expansion deformation conditions and the corresponding expansion force of the expansive soil in multiple directions after the expansive soil absorbs water and expands.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to a device capable of testing multidirectional deformation and expansive force of expansive soil.
Background
Expansive soil in China is widely distributed and mainly distributed in China, south China and southwest China. The expansive soil is usually in a hard state in a natural state, has greatly changed properties after absorbing water and has strong sensitivity to climatic and hydrological factors. The expansive soil has high harmfulness, and is easy to cause uneven vertical or horizontal deformation of buildings or structures, so that the structures are cracked, inclined and even damaged. Therefore, in order to solve a series of engineering problems caused by the swelling and shrinking of the expansive soil, it is necessary to conduct deep experimental research on the expansibility of the expansive soil and to find out the change law of the expansion deformation and the expansive force so as to guide engineering design and construction.
The method for measuring the swelling rate of the swelling soil at present comprises the steps of soaking a swelling soil sample in water under a certain pressure condition in a lateral confinement compression instrument, measuring the increased height of the sample after the swelling is stable, and comparing the measured height with the original height of the sample to obtain the swelling rate. The limitation of this method is that the horizontal deformation of the specimen is constrained and only the vertical deformation of the specimen can be observed. In fact, the expansive soil can generate multidirectional expansion deformation under the condition of no lateral constraint, and the existing instrument cannot measure the deformation. The existing method for testing the expansion force mainly comprises an expansion counter-pressure method, a pressurization expansion method and a balanced pressurization method, wherein the principles of the methods are that a sample is expanded firstly, then the sample is compressed to an initial state by adding a compression load, and the magnitude of the compression load at the moment is the magnitude of the expansion force. These methods work against the expansion force by ensuring that the expansion deformation and the artificial compression deformation are completely consistent, but neglect the influence of the stress path and different stress states of the sample. In addition, the expansion pressure of the sample needs to be measured under the condition of keeping the volume of the sample constant, the traditional test methods cannot keep the volume of the sample constant in the test process, and the method of expanding first and then compressing the sample is excessively disturbed, so that the test result has artificial deviation. Therefore, how to design a new device can measure the expansion deformation of the expansive soil in multiple directions during expansion and can actually measure the magnitude of the expansive force under the condition of not disturbing the expansive soil sample, and the device has great academic value and engineering significance.
Disclosure of Invention
The invention aims to provide a device capable of effectively measuring multidirectional deformation and expansive force around and at the top of expansive soil, aiming at the defects of the prior art.
The purpose of the invention is realized by the following technical scheme: this device of testable inflation soil multidirectional deformation and bulging force, it includes experimental box and sets up water injection device and measuring device on experimental box, its characterized in that: the test box body is a hollow box body with a square bottom surface and an open top surface; a sample placing chamber is arranged at the central position on the inner bottom surface of the test box body, and the sample placing chamber is of a square box body structure comprising a bottom plate and four side baffles; the bottom plate of the sample placing chamber is provided with sliding chutes in the normal direction of the four inner walls of the test box body, and the bottoms of the four side baffles are provided with sliding chute connecting pieces connected with the sliding chutes of the bottom plate, so that the side baffles can slide along the sliding chutes of the bottom plate through the sliding chute connecting pieces; an inter-plate sliding groove is formed in the right side of the inner side of each side baffle, a roller is arranged in the inter-plate sliding groove, a telescopic side plate is arranged at the left end of the inner side of each side baffle, and a clamping shaft is arranged at a height position corresponding to a central hole of the roller in the inter-plate sliding groove at the outer side end of the telescopic side plate; the clamping shaft at the outer side end of the telescopic side plate of each side baffle is inserted into a roller central hole in a sliding chute between the inner side plates of adjacent side baffles, so that the four side baffles are enclosed to form a sample placing chamber with the volume which is increased along with the expansion of a sample by adding water; a groove is formed in a bottom plate of the sample placing chamber, a water permeable plate is additionally arranged in the groove, the top surface of the water permeable plate is flush with the top surface of the bottom plate, a drain hole is formed in the bottom of the groove, and the drain hole is connected with a drain pipe and leads to the outside of the box body; the water injection device comprises a water storage container, a water delivery pipe, a water dripping valve and a water dripping top plate, wherein the water storage container is fixed at the top of one side of the test box body; the measuring device comprises a sensor support horizontally arranged on the inner wall of the periphery of the test box body, one end of a displacement sensor I for measuring the horizontal displacement of the sample is fixedly arranged on the sensor support, and the other end of the displacement sensor I is connected with the outer side of the side baffle of the sample placing chamber; the measuring device also comprises an inverted concave component which is arranged at the top of the other side of the test box body and is matched with the top of the side wall of the box body, a horizontal cantilever cross rod is fixed at the upper part of the component through a bolt, a sensor support which is vertical downwards is arranged at the end part of the cross rod, a displacement sensor II for measuring the vertical displacement of a sample is connected onto the sensor support, and the displacement sensor II is connected with the top surface of the dripping top plate; or, the sensor support is not provided with the sensor support, but is provided with the spiral pressure rod, the end part of the spiral pressure rod is provided with the stress sensor support, the stress sensor support is provided with the stress sensor, and the stress sensor is tightly attached to the side baffle or the drip top plate by adjusting the length of the spiral pressure rod and fixing the spiral pressure rod.
Specifically, the widths of four side baffles of the sample placing chamber are larger than the width of the sample, and a graduated scale is arranged on the inner wall of the sample placing chamber.
Specifically, the flexible curb plate of four blocks of side baffles of sample placing chamber sets up in the left end board of side baffle, and flexible curb plate size slightly is less than the side baffle, is provided with the slide between the last lower plate of side baffle and flexible curb plate.
Specifically, two-layer about the roof that drips is equipped with, the upper strata is equipped with the through-hole with water piping connection, and the lower floor is equipped with a plurality of hole of permeating water, inside the hole makes the even infiltration sample of water through permeating water.
The invention has novel structure, easy installation and convenient operation, can effectively observe the deformation conditions of the periphery and the top of the expansive soil after water absorption and expansion, provides counter force through the side wall of the box body and the cantilever structure at the top, and ensures constant volume in the expansive force test process.
Drawings
FIG. 1 is an elevational cross-sectional view of an embodiment of the invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic perspective view of the side baffle of fig. 1.
Detailed Description
Referring to fig. 1, fig. 2 and fig. 3, the device for testing the multidirectional deformation and expansive force of expansive soil of the present embodiment comprises a test box 1, and a water injection device and a measuring device which are arranged on the test box 1. As can be seen from FIGS. 1 and 2, the test chamber 1 is a hollow chamber with a square bottom and an open top; a sample placing chamber 4 is arranged at the central position on the inner bottom surface of the test box body 1, and the sample placing chamber 4 is of a square box body structure comprising a bottom plate 2 and four side baffles 5; the bottom plate 2 of the sample placing chamber 4 is respectively provided with two sliding grooves 3 along the normal direction of four inner walls of the test box body 1, and the bottom of the four side baffles 5 is provided with sliding groove connecting pieces connected with the sliding grooves 3 of the bottom plate 2, so that the side baffles 5 can slide along the sliding grooves 3 of the bottom plate 2 through the sliding groove connecting pieces. As can be seen from fig. 3, an inter-plate chute 6 is arranged on the right side of the inner side of each side baffle 5, a roller 7 is arranged in the inter-plate chute 6, a telescopic side plate 8 is arranged in the left end plate of the inner side of each side baffle 5, the size of the telescopic side plate 8 is slightly smaller than that of the side baffle 5, a slide way 10 is arranged between the side baffle 5 and the upper and lower plates of the telescopic side plate 8, and a clamping shaft 9 is arranged at a height position corresponding to the central hole of the roller 7 in the inter-plate chute 6 and the outer side end (i.e., the; the clamp shaft 9 at the outer side end of the telescopic side plate 8 of each side baffle 5 is inserted into the central hole of the roller 7 in the sliding chute 6 between the inner side plates of the adjacent side baffles 5, each side baffle 5 can move outwards along the sliding chute 3 on the bottom plate 2 along with the expansion of the sample by adding water, and simultaneously can drive the stretching of the telescopic side plate 8 and the side baffle to move along the expansion direction of the sample through the sliding chute 6 between the plates, so that the volume of the sample placing chamber 4 is changed along with the volume change condition of the sample after soaking and expanding; the width of the four side baffles 5 is larger than the width of the sample, and the inner walls of the four side baffles are provided with graduated scales for convenient observation. Be equipped with the recess on the bottom plate 2 of sample placing chamber 4, add in the recess and be equipped with porous disk 11, the top surface of porous disk 11 and the top surface parallel and level of bottom plate 2, the recess bottom is provided with the wash port, and the wash port is connected with drain pipe 12 and is access to the box outside, and the box outside is equipped with the stagnant water and presss from both sides 13. As shown in fig. 1, the water injection device comprises a water storage container 20, a water delivery pipe 21, a water dropping valve 22 and a water dropping top plate 23, wherein the water storage container 20 is fixed at the top of the right side of the test box body 1, the upper end of the water delivery pipe 21 is connected with the lower part of the water storage container 20, the lower end of the water delivery pipe 21 is connected with the water dropping top plate 23, and the water dropping top plate 23 is arranged right above the sample in the sample placing chamber 4; the water dripping top plate 23 is provided with an upper layer and a lower layer, the upper layer is provided with a through hole connected with the water conveying pipe 21, the lower layer is provided with a plurality of water permeable holes, and water uniformly permeates into the sample through the water permeable holes. The measuring device comprises a sensor support 14 which is horizontally arranged on the inner wall of the periphery of the test box body 1, one end of a displacement sensor I15 for measuring the horizontal displacement of the sample is fixedly arranged on the sensor support 14, and the other end of the displacement sensor I is connected with the outer side of the side baffle 5 of the sample placing chamber 4; the displacement generated around the sample can be measured through a displacement sensor I15; the measuring device also comprises an inverted concave component 16 which is arranged at the top of the left side of the test box body 1 and is matched with the top of the side wall of the box body, a horizontal cantilever cross rod 18 is fixed at the upper part of the component 16 through a bolt 17, a sensor support 14 which is vertical downwards is arranged at the end part of the cross rod 18, a displacement sensor II 19 for measuring the vertical displacement of a sample is connected onto the sensor support 14, and the displacement sensor II 19 is connected with the top surface of a dripping top plate 23; the displacement sensor II can measure the vertical displacement of the top of the sample; the measuring device can be used for testing the expansion rate of the multidirectional deformation of the expansive soil. Or, when the device is used for testing the multidirectional expansive force of the expansive soil, the sensor support 14 is not provided with a sensor support, but is provided with a spiral pressurizing rod, the end part of the spiral pressurizing rod is provided with a stress sensor support, the stress sensor support is provided with a stress sensor, and the stress sensor is tightly attached to the side baffle or the dripping roof by adjusting the length of the spiral pressurizing rod and fixing the spiral pressurizing rod.
The specific steps of the expansion ratio test are as follows:
put into the porous disk in sample placing chamber bottom plate recess, paste filter paper on each face of sample, put into sample placing chamber bottom plate with prefabricated sample on, remove side shield all around, make side shield hug closely in the sample, place the roof that drips above the sample, install the displacement sensor I of measuring horizontal displacement at box sensor support all around, the displacement sensor II of vertical displacement is measured in the top installation, add distilled water in water storage container, pass through water piping connection with the roof that drips, make water evenly see through the sample through the roof that drips, the sample absorbs water the inflation back, measure the sample through displacement sensor around and the displacement of top production.
The specific steps of the expansive force test are as follows:
replace the displacement sensor on the sensor support for the spiral pressure bar, the spiral pressure bar other end and stress sensor leg joint, the stress sensor support other end is connected with stress sensor, through adjustment spiral pressure bar, make the sample produce certain pressure, and the stress sensor of rod end hugs closely in the side shield outer wall, fixed spiral pressure bar, the roof that drips is placed at the sample top, be provided with spiral pressure bar and stress sensor under the box top cantilever horizontal pole, the length of fixed spiral pressure bar when stress sensor contacts the roof, the counter-force that provides through box lateral wall and box top cantilever makes the sample place the room volume fixed, the sample permeates water the inflation back, transmit the produced power of the expansion that absorbs water for stress sensor, measure the sample through stress sensor and reach the bulging force that the top produced all around.
Claims (4)
1. The utility model provides a device that can test inflation soil multidirectional deformation and expansive force which characterized in that: it includes test box and water injection device and the measuring device of setting on test box, its characterized in that: the test box body is a hollow box body with a square bottom surface and an open top surface; a sample placing chamber is arranged at the central position on the inner bottom surface of the test box body, and the sample placing chamber is of a square box body structure comprising a bottom plate and four side baffles; the bottom plate of the sample placing chamber is provided with sliding chutes in the normal direction of the four inner walls of the test box body, and the bottoms of the four side baffles are provided with sliding chute connecting pieces connected with the sliding chutes of the bottom plate, so that the side baffles can slide along the sliding chutes of the bottom plate through the sliding chute connecting pieces; an inter-plate sliding groove is formed in the right side of the inner side of each side baffle, a roller is arranged in the inter-plate sliding groove, a telescopic side plate is arranged at the left end of the inner side of each side baffle, and a clamping shaft is arranged at a height position corresponding to a central hole of the roller in the inter-plate sliding groove at the outer side end of the telescopic side plate; the clamping shaft at the outer side end of the telescopic side plate of each side baffle is inserted into a roller central hole in a sliding chute between the inner side plates of adjacent side baffles, so that the four side baffles are enclosed to form a sample placing chamber with the volume which is increased along with the expansion of a sample by adding water; a groove is formed in a bottom plate of the sample placing chamber, a water permeable plate is additionally arranged in the groove, the top surface of the water permeable plate is flush with the top surface of the bottom plate, a drain hole is formed in the bottom of the groove, and the drain hole is connected with a drain pipe and leads to the outside of the box body; the water injection device comprises a water storage container, a water delivery pipe, a water dripping valve and a water dripping top plate, wherein the water storage container is fixed at the top of one side of the test box body; the measuring device comprises a sensor support horizontally arranged on the inner wall of the periphery of the test box body, one end of a displacement sensor I for measuring the horizontal displacement of the sample is fixedly arranged on the sensor support, and the other end of the displacement sensor I is connected with the outer side of the side baffle of the sample placing chamber; the measuring device also comprises an inverted concave component which is arranged at the top of the other side of the test box body and is matched with the top of the side wall of the box body, a horizontal cantilever cross rod is fixed at the upper part of the component through a bolt, a sensor support which is vertical downwards is arranged at the end part of the cross rod, a displacement sensor II for measuring the vertical displacement of a sample is connected onto the sensor support, and the displacement sensor II is connected with the top surface of the dripping top plate; or, the sensor support is not provided with the sensor support, but is provided with the spiral pressure rod, the end part of the spiral pressure rod is provided with the stress sensor support, the stress sensor support is provided with the stress sensor, and the stress sensor is tightly attached to the side baffle or the drip top plate by adjusting the length of the spiral pressure rod and fixing the spiral pressure rod.
2. The device for testing the multidirectional deformation and expansive force of expansive soil according to claim 1, wherein: the width of four side baffles of the sample placing chamber is larger than that of the sample, and a graduated scale is arranged on the inner wall of the sample placing chamber.
3. The device for testing the multidirectional deformation and expansive force of expansive soil according to claim 2, wherein: the retractable side plates of the four side baffles of the sample placing chamber are arranged in the left end plate of the side baffle, the size of the retractable side plate is slightly smaller than that of the side baffle, and a slide way is arranged between the side baffle and the upper plate and the lower plate of the retractable side plate.
4. The device for testing the multidirectional deformation and expansive force of expansive soil according to claim 1, wherein: the top plate that drips is two-layer about being equipped with, and the upper strata is equipped with the through-hole with water piping connection, and the lower floor is equipped with a plurality of hole of permeating water, and it is inside to make water evenly permeate the sample through the hole of permeating water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718361.5A CN111796074A (en) | 2020-07-23 | 2020-07-23 | Device capable of testing multidirectional deformation and expansive force of expansive soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010718361.5A CN111796074A (en) | 2020-07-23 | 2020-07-23 | Device capable of testing multidirectional deformation and expansive force of expansive soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111796074A true CN111796074A (en) | 2020-10-20 |
Family
ID=72828264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010718361.5A Pending CN111796074A (en) | 2020-07-23 | 2020-07-23 | Device capable of testing multidirectional deformation and expansive force of expansive soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111796074A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748234A (en) * | 2021-01-15 | 2021-05-04 | 甘肃畅陇公路养护技术研究院有限公司 | Geotechnical free expansion test device and method |
| CN113504356A (en) * | 2021-07-12 | 2021-10-15 | 安徽省公路桥梁工程有限公司 | Simple equipment for sampling and detecting swelling strength of swelling soil |
| CN114018799A (en) * | 2021-10-18 | 2022-02-08 | 湖州市检验检测中心 | Device for testing water absorption thickness expansion rate of artificial board and decorative artificial board |
| CN114778801A (en) * | 2022-05-12 | 2022-07-22 | 吉力此且 | Three-dimensional expansive force testing device and method for rock and soil mass |
-
2020
- 2020-07-23 CN CN202010718361.5A patent/CN111796074A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748234A (en) * | 2021-01-15 | 2021-05-04 | 甘肃畅陇公路养护技术研究院有限公司 | Geotechnical free expansion test device and method |
| CN113504356A (en) * | 2021-07-12 | 2021-10-15 | 安徽省公路桥梁工程有限公司 | Simple equipment for sampling and detecting swelling strength of swelling soil |
| CN113504356B (en) * | 2021-07-12 | 2023-08-22 | 安徽省公路桥梁工程有限公司 | Simple equipment for detecting expansion strength by sampling expansive soil |
| CN114018799A (en) * | 2021-10-18 | 2022-02-08 | 湖州市检验检测中心 | Device for testing water absorption thickness expansion rate of artificial board and decorative artificial board |
| CN114018799B (en) * | 2021-10-18 | 2023-05-23 | 湖州市检验检测中心 | Device for testing water absorption thickness expansion rate of artificial board and facing artificial board |
| CN114778801A (en) * | 2022-05-12 | 2022-07-22 | 吉力此且 | Three-dimensional expansive force testing device and method for rock and soil mass |
| CN114778801B (en) * | 2022-05-12 | 2023-12-29 | 中铁十二局集团第四工程有限公司 | Three-dimensional expansion force testing device and testing method for rock-soil body |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111796074A (en) | Device capable of testing multidirectional deformation and expansive force of expansive soil | |
| CN101865810B (en) | Test method for determining unsaturated soil water characteristic parameters | |
| CN102323159B (en) | Test method of permeameter contacting with structure in high stress, high hydraulic gradient, and large shear deformation | |
| CN101509865B (en) | Nonsaturated soil hydraulic parameter measuring device | |
| CN105203410B (en) | A kind of experimental rig for being used to measure rock shearing creep properties | |
| CN103076230B (en) | Test method and test device of mechanical properties of soil-structure contact surface | |
| CN108612073B (en) | High-speed railway foundation expansive soil expansion potential tester | |
| KR100486837B1 (en) | Measuring device for properties of unsaturated soil | |
| CN108316916B (en) | Discharge and production pressure drop control simulation test method under different coal reservoir conditions | |
| CN109459368B (en) | Osmotic instrument for realizing multi-field coupling and in-situ dry-wet circulation | |
| CN104020047A (en) | Solidification and permeation combined testing device and method | |
| CN104458529A (en) | Multifunctional indoor rain water infiltration simulating experiment device for unsaturated soil | |
| CN105784444A (en) | Indoor apparatus and method for producing hollow cylindrical remolded clay specimen by compressing | |
| CN205138906U (en) | A test device for measuring rock shear creep characteristic | |
| KR20060108414A (en) | Test apparatus of draining ability | |
| CN206818523U (en) | A kind of coefficient of collapsibility of loess is layered in-situ testing device | |
| CN201628668U (en) | Testing device for measuring unsaturated soil water characteristic | |
| CN103033460B (en) | The determinator of soil body horizontal osmotic coefficient and method thereof | |
| CN208254963U (en) | It is a kind of measurement immersion under the conditions of expand the soil volume change experimental rig | |
| CN212459689U (en) | Device capable of testing multidirectional deformation and expansive force of expansive soil | |
| CN116446470A (en) | Pile-supporting embankment model test device and method under rainfall and dry-wet circulation effects | |
| CN106767358B (en) | Device and method for measuring solidification deformation and drainage of unsaturated soil | |
| CN214278155U (en) | Sample deformation testing arrangement that absorbs water | |
| CN109100229A (en) | It is a kind of measurement immersion under the conditions of expand the soil volume change experimental rig | |
| CN210720094U (en) | Testing device for mechanical property changes of formation slurry permeation and formation soil body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |