CN1056661C - Vacuum compressometer and experiment method - Google Patents
Vacuum compressometer and experiment method Download PDFInfo
- Publication number
- CN1056661C CN1056661C CN 95104344 CN95104344A CN1056661C CN 1056661 C CN1056661 C CN 1056661C CN 95104344 CN95104344 CN 95104344 CN 95104344 A CN95104344 A CN 95104344A CN 1056661 C CN1056661 C CN 1056661C
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- vacuum
- piston plate
- cutting ring
- container base
- soil sample
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Abstract
The present invention belongs to experimental equipment and an experimental method for reinforcing a foundation by a vacuum compressing method. The scheme is provided for solving the vacant problem of the experimental equipment and the experimental method which are the same as soft foundation reinforcing technology by a vacuum prepressing method. The vacuum experimental equipment is composed of an experimental pedestal, a container base, a cutting ring, a porous stone, a piston plate, a sealing membrane, a loading cross beam, a bracket, a deformed sensor and a vacuum-pumping system, wherein the cutting ring is used for cutting a soil sample. Vacuum negative pressure is transferred to both end surfaces of the soil sample, the vacuum negative pressure can be loaded to a position at one time, the deformed condition of the soil sample can be directly observed, and vacuum pressurization and entity loading pressurization can be carried out in a superposed way. The present invention has the characteristics of basically identical stress condition to the vacuum prepressing method, true and reliable data, time saving and low cost.
Description
The invention belongs to the experimental facilities with vacuum compression method consolidated subsoil, it is specifically related to the structure of this instrument and concrete method of operating thereof.
On the inherent laboratory apparatus in laboratory the processing object in the engineering is done the concrete experiment that conforms with execution conditions, with the method means of observing its performance parameter, Changing Pattern is crucial, for directly observation, research calculating, improvement project and even develop new theory and method has been created the condition that makes things convenient for.After the success of vacuum method reinforcing flexible foundation or ultra-soft base technology, large-scale popularization develops very fast at home in construction work.But the The deformation calculation in the reinforcing soft foundation design is still applied mechanically conventional before loading compression experiment coefficient, the loading compression experiment meets the stress condition of charge preloading consolidation, differ greatly with the stress condition of vacuum prepressing reinforcement soft base and the mechanism of reinforcing soft foundation, therefore the development of engineering just presses for new laboratory facilities, new computational methods occur, but the present domestic breakthrough of still not having in this respect.Know the Russian Patent SU842127 mensuration of soil deformation modulus " when under vacuum condition, the handling soil sample and reaching surface-stable to " by retrieval, it provides a kind of soil sample of taking out to be placed on and to vacuumize observation among the airtight container and calculate the compression of soil sample and the indoor model test method of deformation rule, it is to get square large-scale soil sample to be placed in the high vacuum and to observe, and soil sample and atmosphere are isolated in this experiment; It also provides a kind of hole that digs, and vacuumizes the field experiment method of observing soil swelling distortion situation after adding a cover.These two kinds of experimental techniques all need special installation, and time is long, and expense is big, but differ too big with the execution conditions of vacuum prepressing reinforcement soft base, the data of surveying directive function distance that working design is calculated also very big, there is no practical value.
The objective of the invention is to combine with vacuum prepressing reinforcement soft base technique provides a kind of working environment identical laboratory experiment equipment and experimental technique, this vacuum compressometer and experimental technique can accurately be observed the deformation rule of soil sample under the vacuum pressure effect, calculate accurate useful technology parameter, with modification and even the new theory of research and development directive significance is arranged to determining, to fill up the blank of this scheme experimental facilities and method.
By as above design, the feature of the vacuum compressometer that this programme provided is: it is made up of experiment pedestal, container base, cutting ring, permeable stone, piston plate, diaphragm seal, rubber stirrup, loading crossbeam, support, deformation-sensor, pumped vacuum systems, the experiment pedestal inserts vacuum line and leads to the pedestal upper surface, and the support that deformation-sensor is installed also is fixed on the experiment pedestal; Container base matches with the upper surface of experiment pedestal, cutting ring is the soil sampling instrument of the upper end band edge of a knife, match with the rim of the mouth of container base in its lower end, cutting ring two permeable stones are arranged up and down, its contour shape is identical with the shape of the inner surface of cutting ring, but undersized, piston plate is a full rigid slab, shape is identical with permeable stone with physical dimension, and the twice groove is arranged on the external surface, and it is switched to vacuum line the soffit of piston plate; Its diaphragm seal is limber pliable and tough thin-walled tubular article, and it matches with the external surface of piston plate, overlaps permeable stone, cutting ring and cooperates with container base, ties tight outside diaphragm seal with respect to the groove place of piston plate and container base with the rubber stirrup; Deformation-sensor is equipped with on support top, and the center-pole of sensor contacts with piston plate by bulb, also has one to load crossbeam at the step place on bulb top; Vacuum system includes jet vacuum pump, vacuum meter, joint door, tee junction, connecting tube and forms, use the connecting tube coupled in series between jet vacuum pump, vacuum meter, Jie Men and tee junction, the vacuum of vacuum system passes to the soffit of piston plate and the upper surface of experiment pedestal by connecting tube.
In this programme, the profile of container base, cutting ring, permeable stone and piston plate is circle.Its permeable stone is a kind of good rigidity and the metallic particles sinter that bigger permeable micropore is arranged.
The feature of using vacuum compressometer that soil sample is carried out the vacuum compression experimental technique is that the edge of a knife with cutting ring cuts out not by the soil sample that is full of cutting ring inside of disturbance, be placed on the permeable stone of container base inside, on soil sample, put permeable stone, piston plate well, be locked and be locked with the appearance of diaphragm seal with the rubber stirrup with each parts, the ball head of deformation-sensor is contacted with the upper surface of piston plate, vacuumize the loading one-time-reach-place, read vacuum values and deformation data by the time interval, can draw t after being handled
90Coefficient of permeability K, coefficient of consolidation C
vAnd degree of consolidation U
tWith time t, distortion S
tRelation and void ratio e, the compression coefficient A of random time
v
Adopt this programme can embody following superiority: vacuum experiment instrument that 1. this programme provided and experimental technique are consistent with the environment and the condition of " jet vacuum pump of vacuum prepressing reinforcement soft base special use " that the applicant's separate case proposes, all be to make load to vacuumize the atm difference that is caused the back, discharging consolidation compression rule and the technical data thereof measured are true and reliable, indoor experimental analysis calculating is consistent with the application of engineering, and its theory analysis just has more directive significance to engineering practice; 2. use this instrument can once apply, can not produce the phenomenon that weak soil is extruded 90～94KPa load of soil sample; 3. this experimental technique can once load and put in place, can save the plenty of time, and the cycle weak point is convenient to automatic control; 4. it can do the vacuum compression experiment of single or double, also can carry out the compression property experiment of vacuum pressure and entity load stack; 5. this compressometer is simple in structure, and vacuum pressure source adopts the special-purpose jet vacuum pump of the applicant's separate case application meanwhile, and it is to add ejector with centrifugal pump to have replaced conventional vacuum pump, greatly reduces cost and maintenance easy to operate, easy.
Fig. 1 is the structural representation of this programme vacuum compressometer.
The embodiment of existing accompanying drawings this programme.Vacuum source in the pumped vacuum systems among the figure is special-purpose jet vacuum pump (13), also can use general vacuum pump, its vacuum is represented with vacuum meter (12), vacuum pump and vacuum meter, joint door (11), three general connecting tube (10) coupled in series, receive piston plate (4) and test the container base of putting above the pedestal (14) (1) through two connecting tubes (10) again, there is permeable stone (3) its inside, in the rim of the mouth on container base top, place its inside of cutting ring (2) experiment soil sample (15) is arranged, place permeable stone (3) and piston plate (4) on the soil sample, entangling each parts with diaphragm seal (5) also ties tight with rubber stirrup (6), fixing support (8) on the experiment pedestal, on support, adorning deformation-sensor (9), the center-pole lower end of sensor has bulb to contact with piston plate (4), and be equipped with and load crossbeam (7) at the step place on the center-pole bulb.
Use the cutting ring soil sampling during work, or cut from the soil sample that drills through, each parts installs and performs encapsulation process, deformation-sensor can be the sensor of condenser type, inductance type or resistance-type, take out the signal of telecommunication from deflection, also dial gage or dial gauge can be installed, can directly read distortion numerical value.Start jet vacuum pump and open the joint door, vacuum passes on the soil sample from upper and lower faces, and moisture and air in the soil sample all are sucked out, and soil property particle crypto set more under vacuum and atm difference effect can be read deformation data on deformation-sensor.This instrument can also carry out vacuum load and entity and loads stack and carry out when needed.Loading procedure begins to discharge a certain amount of water from soil sample gentle, so the data value of vacuum is to rise gradually, and experiment beginning, in accordance with regulations time interocclusal record vacuum values and distortion numerical value were observed 24 hours, and the gained data are handled again.
Claims (4)
1. vacuum compressometer, it is characterized in that it is made up of experiment pedestal (14), container base (1), cutting ring (2), permeable stone (3), piston plate (4), diaphragm seal (5), rubber stirrup (6), loading crossbeam (7), support (8), deformation-sensor (9), pumped vacuum systems, experiment pedestal (14) inserts vacuum line (10) and leads to the pedestal upper surface, and the support (8) that deformation-sensor (9) is installed also is fixed on the experiment pedestal (14); Container base (1) matches with the upper surface of experiment pedestal (14), cutting ring (2) is the soil sampling instrument of the upper end band edge of a knife, match with the rim of the mouth of container base (1) in its lower end, cutting ring (2) two permeable stones (3) are arranged up and down, its contour shape is identical with the shape of the inner surface of cutting ring, but undersized, piston plate (4) is a full rigid slab, shape is identical with permeable stone with physical dimension, and the twice groove is arranged on the external surface, and it is switched to vacuum line (10) soffit of piston plate; Its diaphragm seal (5) is limber pliable and tough thin-walled tubular article, it matches with the external surface of piston plate, overlapped permeable stone, cutting ring and cooperated, tied tight outside diaphragm seal with respect to the groove place of piston plate and container base with rubber stirrup (6) with container base; Deformation-sensor (9) is equipped with on support (8) top, and the center-pole of sensor contacts with piston plate (4) by bulb, also has one to load crossbeam (7) at the step place on bulb top; Vacuum system includes jet vacuum pump (13), vacuum meter (12), joint door (11), a tee junction, connecting tube (10) is formed, with connecting tube (10) coupled in series, the vacuum of vacuum system passes to the soffit of piston plate and the upper surface of experiment pedestal by connecting tube (10) between jet vacuum pump, vacuum meter, Jie Men and tee junction.
2. according to the described vacuum compressometer of claim 1, it is characterized in that the profile of container base (1), cutting ring (2), permeable stone (3) and piston plate (4) is circle.
3. according to the described vacuum compressometer of claim 1, the permeable stone (3) that it is characterized in that it is a kind of good rigidity and the metallic particles sinter that bigger permeable micropore is arranged.
4. one kind is used vacuum compressometer that soil sample is carried out the method that vacuum compression is tested, it is characterized in that cutting out not by the soil sample that is full of cutting ring inside of disturbance with the edge of a knife of cutting ring (2), be placed on the inner permeable stone (3) of container base (1), on soil sample, put permeable stone (3) well, piston plate (4), be locked and be locked with the appearance of diaphragm seal (5) with rubber stirrup (6) with each parts, the ball head of deformation-sensor (9) is contacted with the upper surface of piston plate (4), vacuumize the loading one-time-reach-place, read vacuum values and deformation data by the time interval, can draw t after being handled
90Coefficient of permeability K, coefficient of consolidation C
vAnd degree of consolidation U
tWith time t, distortion S
tRelation and void ratio e, the compression coefficient A of random time
v
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95104344 CN1056661C (en) | 1995-04-22 | 1995-04-22 | Vacuum compressometer and experiment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95104344 CN1056661C (en) | 1995-04-22 | 1995-04-22 | Vacuum compressometer and experiment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1119276A CN1119276A (en) | 1996-03-27 |
| CN1056661C true CN1056661C (en) | 2000-09-20 |
Family
ID=5075100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95104344 Expired - Fee Related CN1056661C (en) | 1995-04-22 | 1995-04-22 | Vacuum compressometer and experiment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1056661C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998430A (en) * | 2012-12-05 | 2013-03-27 | 中国地质大学（北京） | Vacuum supercharge combined prepressing experiment device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100575920C (en) * | 2005-03-28 | 2009-12-30 | 同济大学 | Lysimeter |
| CN102809512A (en) * | 2012-08-26 | 2012-12-05 | 长安大学 | Vacuum loading compaction test device for asphalt mixture test piece |
| CN105043960B (en) * | 2015-08-04 | 2018-03-02 | 同济大学 | A kind of modified soil body joint consolidation permeameter |
| CN108385737A (en) * | 2018-02-02 | 2018-08-10 | 山东科技大学 | A kind of vacuum preloading soft groundsill reinforcing sunykatuib analysis instrument and test method |
-
1995
- 1995-04-22 CN CN 95104344 patent/CN1056661C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998430A (en) * | 2012-12-05 | 2013-03-27 | 中国地质大学（北京） | Vacuum supercharge combined prepressing experiment device |
| CN102998430B (en) * | 2012-12-05 | 2015-09-30 | 中国地质大学（北京） | Combined Vacuum-surcharge Preloading experimental provision |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1119276A (en) | 1996-03-27 |
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