CN107389491B - Soil disintegration experimental device and using method - Google Patents
Soil disintegration experimental device and using method Download PDFInfo
- Publication number
- CN107389491B CN107389491B CN201710547711.4A CN201710547711A CN107389491B CN 107389491 B CN107389491 B CN 107389491B CN 201710547711 A CN201710547711 A CN 201710547711A CN 107389491 B CN107389491 B CN 107389491B
- Authority
- CN
- China
- Prior art keywords
- disintegration
- sample
- balance
- soil
- electronic balance
- 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.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
Abstract
The invention relates to a soil disintegration experimental device, and belongs to the field of constructional engineering. The electronic balance comprises a support with two layers of table tops, wherein an electronic balance is respectively arranged on each of the two layers of table tops of the support, a sling frame is horizontally arranged on the electronic balance below the electronic balance, two ends of the sling frame are used for hanging a screen plate through a sling penetrating through the table tops, the screen plate is used for placing a sample, the sling frame is horizontally arranged on the electronic balance above the electronic balance, two ends of the sling frame are used for hanging an inner disintegration cylinder through the sling penetrating through the table tops, and the screen plate is hung in the inner disintegration cylinder; the inner disintegration tank is hung in the outer disintegration tank. The device adopts the change of the reading of the balance to measure the disintegration condition of the soil body, and the reading is stable and has high accuracy; the device has the advantages that the upper balance, the lower balance and the unique inner and outer double disintegration cylinders are adopted, so that the corresponding water absorption amount can be measured while the soil disintegration amount at each moment is measured, the device has the greatest characteristic, and the influence of the water absorption amount on the soil disintegration is considered.
Description
Technical Field
The invention relates to a soil disintegration experimental device and a using method thereof, belonging to the field of constructional engineering.
Background
At present, the soil disintegration tester mainly comprises a buoy, a mesh plate, a water tank and the like (see Water conservancy project geotechnical test specification S L237-.
The existing device adopts the position change of the floating barrel to determine the disintegration amount, the floating barrel is very unstable in the position change process, and the reading precision is not enough. And the relation between the water absorption capacity of the soil body and the disintegration capacity in the disintegration process is not considered.
Disclosure of Invention
The invention aims to provide a soil disintegration experimental device and a using method thereof.
A soil body disintegration experiment device comprises a support with double layers of table tops, wherein an electronic balance is respectively arranged on each of the two layers of table tops of the support, a sling frame is horizontally arranged on the electronic balance below the support, two ends of the sling frame are hung with a screen plate through sling penetrating through the table tops, the screen plate is used for placing a sample, the sling frame is horizontally arranged on the electronic balance above the support, two ends of the sling frame are hung with an inner disintegration cylinder through the sling penetrating through the table tops, and the screen plate is hung in the inner disintegration cylinder;
the inner disintegration tank is hung in the outer disintegration tank and is immersed by the disintegration liquid.
The device adopts the change of the reading of the balance to measure the disintegration condition of the soil body, and the reading is stable and has high accuracy; the device has the advantages that the upper balance, the lower balance and the unique inner and outer double disintegration cylinders are adopted, so that the corresponding water absorption amount can be measured while the soil disintegration amount at each moment is measured, the device has the greatest characteristic, and the influence of the water absorption amount on the soil disintegration is considered.
The experimental device is characterized in that sterile deionized water and a mesh plate are generally selected as the disintegrating liquid, and when the experiments of acid resistance, alkali resistance and the like are to be performed, corresponding disintegrating cylinders, mesh plates and lifting ropes are manufactured according to the specific disintegrating liquid. The using method comprises the following steps:
1. adjusting the height of the screen plate and the height of a deionized water surface according to the size of a sample, so that the liquid level of the outer disintegration cylinder just exceeds the inner cylinder, the sample is placed on the screen plate and just submerged by the deionized water, and enough space is left for the disintegration of the sample at the lower part of the screen plate;
2. opening a camera to aim at the outer disintegration cylinder, the inner disintegration cylinder and the electronic balance for shooting;
3. resetting the electronic balance, placing the sample in the center of the screen plate, starting a stopwatch, and immediately measuring and recording the reading of the electronic balance; the time interval of the measurement can be shortened or increased properly according to the disintegration speed of the sample until the disintegration is finished.
When the sample completely fell through the grid, the experiment was completed. If the sample does not disintegrate for a long period of time, the condition of the sample in water is recorded and the experiment is ended.
Drawings
FIG. 1: the structural schematic diagram of the soil body disintegration experimental device. 1-bracket, 2-electronic balance, 3-sling mount, 4-sling, 5-inner disintegration cylinder, 6-outer disintegration cylinder, 7-screen plate, and 8-sample.
FIG. 2: example 1 disintegration soil mass versus time curve.
FIG. 3: example 1 water absorption versus time curve.
Detailed Description
As shown in fig. 1, a soil disintegration testing device comprises a support with two layers of table tops, wherein an electronic balance is respectively placed on each of the two layers of table tops of the support, a sling frame is horizontally placed on the lower electronic balance, two ends of the sling frame are used for hanging a screen plate through sling penetrating through the table tops, the screen plate is used for placing a sample, the sling frame is horizontally placed on the upper electronic balance, two ends of the sling frame are used for hanging an inner disintegration cylinder through sling penetrating through the table tops, and the screen plate is hung in the inner disintegration cylinder;
the inner disintegration tank is hung in the outer disintegration tank and is immersed by the disintegration liquid.
The experimental undisturbed soil or disturbed soil is taken according to requirements to be made into a standard geotechnical cylinder sample with the thickness of 61.8mm 20mm, 61.8mm 40mm and the diameter of 39.1mm, 61.8mm and 101mm, the height of which is 2-2.5 times of the diameter or a cube sample with the size of 5cm, the undisturbed soil is taken according to the three-axis experimental standard, when the disturbed soil sample is made, the operation steps are that ① selects a certain number of representative soil samples, air-dries, crushes and sieves the soil samples according to the required water content, ② water is slightly distributed, the representative soil samples are placed in a moisture-preserving cylinder for standing overnight after water distribution, the soil samples are taken out before ③ sample preparation, the water content of the soil samples is retested, the difference value between the measured water content and the required water content is less than +/-1%, otherwise the water content is required to be adjusted until the required water content meets the requirements, ④ is used for weighing the required dry density and the required soil mass according to the experimental height of 3 layers, each layer is tamped, and then the surface of each layer is planed to the required height, and the required heightAdding the layer 2 soil material, continuing the process until the last layer is hit, leveling the two ends of the sample in the sample hitting cylinder, taking out the sample and weighing the sample, wherein the density difference of the sample is less than 0.02g/cm3。
Sterile deionized water is generally selected for the disintegrating liquid in the experiment, and a steel wire mesh is selected for the mesh plate. Opening the camera and aim at disintegration jar and electronic balance and make a video recording before the experiment begins, according to sample size adjustment otter board height and liquid level height for outer jar liquid level just crosses the inner jar and the sample is unlikely to next the otter board again after disintegrating, zero clearing the balance after adjusting, put the sample at otter board central authorities rapidly, start the stopwatch, and survey immediately and remember the reading of balance when beginning. And measuring and recording the readings of the balance at 1s, 3s, 10s, 30s, 1min, 3min, 10min, 30min, 1h, 2h, 3h and 4h … … after the experiment begins, and appropriately shortening or increasing the time interval of measurement until the disintegration is finished according to the disintegration speed of the sample. When the sample completely fell through the grid, the experiment was completed.
The basic principle of the device in the use process is as follows:
the method considers the influence of the water absorption capacity of the sample on soil disintegration, and has 4 basic assumptions: the density of water does not change in the disintegration process; the porosity ratio of the undisrupted sample does not change during the disintegration process; the influence of overlying water pressure on the sample is not considered; the disintegrated soil sample has no gas. The reading on the balance is the sample disintegration weight minus the buoyancy of the disintegration soil; the lower balance reads the sum of the remaining weight and water uptake of the sample minus the buoyancy of the remaining sample. Along with the disintegration, the disintegrated object falls into the inner disintegration cylinder, the reading of the upper balance is increased, the reading of the lower balance is reduced until the disintegration is complete, and the experiment is finished.
The relationship is derived as follows (initial upper and lower balance all clear):
at a particular moment
In the formula: mut、Mdt-upper and lower balance readings at time t, respectively; m isdst-mass of disintegrated soil at time t; ds-is the relative density of the soil sample; m is0-is the initial mass of the sample; omega-is the initial water content of the sample; rhow-is the density of water; v0-is the initial volume of the sample; rho0-is the sample initial density; m isawtThe water absorption of the sample at time t.
Solving the two equations can obtain:
description of the index of disintegration
1. Amount of disintegration of sample at time t: m isdst；
2. Disintegration rate of sample at time t:
3. water absorption of the sample at time t: m isawt；
4. Water absorption of the sample at time t:
5. sample at time ti～ti+1The disintegration rate of (c):
6. sample at time ti～ti+1Water absorption rate of (2):
7. sample at time ti～ti+1Relative disintegration rate of (c):
8. sample at time ti～ti+1Relative water absorption rate of (c):
example 1
And removing a certain dredged sludge storage yard for sampling, and measuring that the water content of the soil body is 30 percent and the specific gravity is 2.31. The retrieved soil sample was cut with a tool change of 68.1mm (diameter) by 40mm (height) and dried in an oven at 105 ℃ for 12h as a disintegration sample (water content was considered zero). The dried sample had a height of 37mm, a diameter of 58mm and a mass of 179.11 g. The initial volume was calculated to be 97.757cm2Initial density of 1.832g/cm2。
The apparatus was set up as shown, the outer tank was filled with distilled water and the inner tank was flooded, and the position was adjusted so that the distance between the liquid level of the outer tank and the screen was 4.5cm and 1cm above the top of the inner tank. Meanwhile, the suspension rope line is ensured not to be contacted with a foreign object between the suspension rope frame and the suspended object. After the adjustment is completed, the balance is reset, the sample is quickly placed in the center of the screen plate, the stopwatch is started, and the reading of the balance at the beginning is immediately measured and recorded. The upper and lower scale readings were measured at 1min, 2min, 3min, 4min, 5min, 6min, 7min … … after the start of the experiment, the sample disintegrated substantially completely at 21min, and the measured readings are shown in the table below.
The mass of the disintegrated soil and the water absorption capacity at each moment are calculated according to the formula, and the curves of the mass and the water absorption capacity are drawn according to the time, and are shown in figures 2 and 3.
Claims (1)
1. The using method of the soil body disintegration experiment device is characterized in that the soil body disintegration experiment device comprises a support with double layers of table tops, wherein an electronic balance is respectively placed on each of the two layers of table tops of the support, a sling frame is horizontally placed on the electronic balance below the electronic balance, two ends of the sling frame are used for hanging a screen plate through sling penetrating through the table top, the screen plate is used for placing a sample, the sling frame is horizontally placed on the electronic balance above the electronic balance, two ends of the sling frame are used for hanging an inner disintegration cylinder through the sling penetrating through the table top, and the screen plate is hung in the inner disintegration cylinder;
the inner disintegration tank is hung in the outer disintegration tank, the disintegration liquid is deionized water, and the screen plate is a steel wire mesh; the using method comprises the following steps:
1) adjusting the height of the screen plate and the height of a deionized water surface according to the size of a sample, so that the liquid level of the outer disintegration cylinder just exceeds the inner disintegration cylinder, the sample is placed on the screen plate and just submerged by the deionized water, and enough space is left for the disintegration of the sample at the lower part of the screen plate;
2) opening a camera to aim at the outer disintegration cylinder, the inner disintegration cylinder and the electronic balance for shooting;
3) resetting the electronic balance, placing the sample in the center of the screen plate, starting a stopwatch, and immediately measuring and recording the reading of the electronic balance; according to the disintegration speed of the sample, the time interval of the measurement can be properly shortened or increased; measuring and recording until the disintegration is finished;
the method considers the influence of the water absorption capacity of the sample on soil disintegration, and has 4 basic assumptions: the density of water does not change in the disintegration process; the porosity ratio of the undisrupted sample does not change during the disintegration process; the influence of overlying water pressure on the sample is not considered; the disintegrated soil sample is free of gas, the reading of the upper balance is obtained by subtracting the buoyancy of the disintegrated soil from the disintegration weight of the sample, the reading of the lower balance is obtained by subtracting the buoyancy of the remaining sample from the sum of the remaining weight and the water absorption capacity of the sample, along with the disintegration, the disintegrated object falls into the inner disintegration cylinder, the reading of the upper balance is increased, the reading of the lower balance is reduced until the disintegration is complete, and the experiment is finished;
at a particular moment
In the formula: mut、MdtRespectively reading the upper balance and the lower balance at the time t; m isdstThe mass of the disintegrated soil at the moment t; dsIs the relative density of the soil sample; m is0Is the initial mass of the sample; omega is the initial water content of the sample; rhowIs the density of water; v0Is the initial volume of the sample; rho0Is the initial density of the sample; m isawtThe water absorption capacity of the sample at time t;
solving the two equations can obtain:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710547711.4A CN107389491B (en) | 2017-07-06 | 2017-07-06 | Soil disintegration experimental device and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710547711.4A CN107389491B (en) | 2017-07-06 | 2017-07-06 | Soil disintegration experimental device and using method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107389491A CN107389491A (en) | 2017-11-24 |
| CN107389491B true CN107389491B (en) | 2020-07-24 |
Family
ID=60335432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710547711.4A Active CN107389491B (en) | 2017-07-06 | 2017-07-06 | Soil disintegration experimental device and using method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107389491B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776210A (en) * | 2018-05-25 | 2018-11-09 | 南昌大学 | A kind of ground that drying and watering cycle is coupled with temperature disintegration experimental provision and its experimental method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130131Y (en) * | 2007-12-24 | 2008-10-08 | 中国科学院水利部成都山地灾害与环境研究所 | Soil disintegration determinator |
| CN201397328Y (en) * | 2009-04-01 | 2010-02-03 | 长安大学 | Large test loess block disintegration tester |
| CN203745323U (en) * | 2014-03-14 | 2014-07-30 | 西安科技大学 | Remolded soil disintegration testing apparatus |
| CN105651642A (en) * | 2015-12-31 | 2016-06-08 | 常州工学院 | Humidifying disintegration tester for cohesive soil and testing method thereof |
| CN206862821U (en) * | 2017-07-06 | 2018-01-09 | 武汉科技大学 | A kind of soil body is disintegrated experimental provision |
-
2017
- 2017-07-06 CN CN201710547711.4A patent/CN107389491B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130131Y (en) * | 2007-12-24 | 2008-10-08 | 中国科学院水利部成都山地灾害与环境研究所 | Soil disintegration determinator |
| CN201397328Y (en) * | 2009-04-01 | 2010-02-03 | 长安大学 | Large test loess block disintegration tester |
| CN203745323U (en) * | 2014-03-14 | 2014-07-30 | 西安科技大学 | Remolded soil disintegration testing apparatus |
| CN105651642A (en) * | 2015-12-31 | 2016-06-08 | 常州工学院 | Humidifying disintegration tester for cohesive soil and testing method thereof |
| CN206862821U (en) * | 2017-07-06 | 2018-01-09 | 武汉科技大学 | A kind of soil body is disintegrated experimental provision |
Non-Patent Citations (2)
| Title |
|---|
| 定体积黄土崩解仪器的研制与应用;王念秦;《中国地质灾害与防治学报》;20150930;第26卷(第3期);全文 * |
| 重塑黄土崩解特性试验研究;高建伟;《长江科学院院报》;20141031;第31卷(第10期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107389491A (en) | 2017-11-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101988886B (en) | Simulation test device for studying slope runoff and underground hole fissure flow | |
| CN103884561B (en) | The devices and methods therefor of artificial preparation structural original soft clay test soil sample | |
| CN109470580B (en) | Method for evaluating cohesive soil strength parameters of different sea areas in China | |
| CN203745323U (en) | Remolded soil disintegration testing apparatus | |
| CN104931305B (en) | The method and experimental rig of a kind of indoor reduced scale experiment relative density sample preparation standard for determining Coarse Aggregate | |
| CN107389491B (en) | Soil disintegration experimental device and using method | |
| CN108152118A (en) | A kind of pile formula subgrade seepage flow erosion test device of adjustable head | |
| CN106830791B (en) | A kind of non-fine concrete surface area mix calculation method | |
| CN102359929A (en) | Test method for permeation coefficient of permeable concrete | |
| CN201859104U (en) | Simulation test device for researching sheet flow and underground hole fissure flow | |
| CN201561921U (en) | Varying water head pressure permeameter | |
| CN111458255B (en) | Device for automatically testing and recording water content of rock sample in water immersion test | |
| CN101710115A (en) | Soil disintegration tester | |
| CN205228918U (en) | Soil field capacity soil sample making devices | |
| CN109406758B (en) | Tester for three-dimensional water absorption expansion rate and expansion force of expansive soil | |
| CN111896716A (en) | Experimental device and method for monitoring soil expansion and shrinkage characteristics | |
| CN106706498A (en) | Steady state water permeability coefficient testing device and method of concrete type material | |
| CN207946286U (en) | A kind of experimental provision for measuring seepage inflow erosion | |
| Åhnberg | Effects of back pressure and strain rate used in triaxial testing of stabilized organic soils and clays | |
| CN114894655A (en) | Experimental device and method for simulating combined driving of soil particle loss by back-and-forth seepage and dry-wet cycle | |
| CN111610111B (en) | Soil mass disintegration test method under simulated hail condition | |
| CN208254990U (en) | A kind of test device tested for measuring dredging clay ball disintegration | |
| CN213301975U (en) | Test device for simulating different water content compacted bentonite corrosion environments | |
| CN203772622U (en) | Device for artificially preparing structured intact soft clay test soil sample | |
| CN114018700A (en) | Large-scale soil-rock mixed soil sample indoor compression instrument and filling deformation and stability calculation method |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |