CN205263085U - Simulation open type tubular pile pile sinking in -process produces test device of soil stopper effect - Google Patents
Simulation open type tubular pile pile sinking in -process produces test device of soil stopper effect Download PDFInfo
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- CN205263085U CN205263085U CN201521112544.3U CN201521112544U CN205263085U CN 205263085 U CN205263085 U CN 205263085U CN 201521112544 U CN201521112544 U CN 201521112544U CN 205263085 U CN205263085 U CN 205263085U
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- soil
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- balancing gate
- gate pit
- plug
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model discloses a simulation open type tubular pile pile sinking in -process produces test device of soil stopper effect relates to soil mechanics pile foundation engineering technique. This device is: base, pressure chamber and pressure head connect gradually the constitution exterior structure from bottom to top, take and support and the effect of side limit, descend permeable stone, soil sample, last permeable stone, copper plug, pressure sensor to connect gradually and constitute inner structure from bottom to top, play infiltration, filtration and measurement effect, copper plug is provided with the sealing washer with contact department of pressure chamber, and base upper portion is provided with the sealing washer with the pressure chamber junction, plays sealed effect. The soil stopper effect that open type tubular pile pile sinking in -process produced can be simulated to this device, and application pressure sensor and load displacement sensor synchronous sampling data obtain the change rule the when frictional resistance compresses under drainage and drainage condition not along with the soil stopper, and the investment regime can realize a lot of industry and duplicate moreover.
Description
Technical field
The utility model relates to rock-soil mechanics pile foundation engineering technique, relates in particular to a kind of simulation open type pile tube pile driving processThe middle experimental rig that produces soil plug effect.
Background technology
Open-end pipe pile sinks to process, and the native part of stake end is pressed against periphery, and a part pours in pipe and forms " soil plug ". Soil plugBe subject to the effect of tube wall frictional resistance and will produce certain compression, soil is filled in height and inaccessible degree and soil nature, caliber, wall thickness and is entered and holdsThe factors such as the degree of depth of power layer are relevant. Inaccessible degree direct influence end resistance performance and the bearing capacity that destroys proterties and stake, claim thisFor soil plug effect. Squeeze in process in stake, consider soil plug and the frictional resistance of inside pipe wall and the bearing capacity of pipe pile end soil, can be by soilFill in to be divided into and entirely shut and part obturation; The inaccessible degree of soil plug can exert an influence to the driving resistance of stake and load-carrying properties. WithTime, draining and und rained condition are also different on the impact of soil plug effect. Under und rained condition, the axial effective stress of increaseMainly born by pore water, effective stress does not almost increase, therefore available frictional resistance changes not quite; Under drainage condition,Along with the increase of load, the stress in soil plug is also increasing, and forms soil arch; Soil arch action causes very high inner frictional resistance.
At present, the test method of simulation soil plug effect is divided into: indoor small-size model test and the number that utilizes software to carry outValue sunykatuib analysis. Indoor model test is the omnidistance pile sinking test of simulation, and the consideration stake size in footpath and the difference of soil nature are imitated soil plugThe impact of answering, the height change of research soil plug in pile driving process and the impact that the density of all soil of stake is produced; Enter by softwareThe numerical simulation study of row be in pile driving process in the flowing of particle, stake and the hole variation of stake week soil. But more than testAll do not consider that frictional resistance when soil plug compresses under draining and und rained condition changes, can not reflect soil plug effect comprehensivelyRule.
Summary of the invention
The purpose of this utility model is all do not consider soil plug in draining and do not arrange in view of current laboratory test and numerical simulationFrictional resistance situation of change while compression under water condition, produces soil plug in the one providing simulation open type pile tube pile driving processThe experimental rig of effect, can increase the understanding to soil plug effect.
The purpose of this utility model is achieved in that
One, in simulation open type pile tube pile driving process, produce the experimental rig (abbreviation device) of soil plug effect
This device comprises pressure head, balancing gate pit, base, pressure sensor, copper plug, upper dankness stone, soil sample, lower permeable stone, rowWater valve, relieving ring, sealing ring and exhaust cap;
In balancing gate pit, be provided with circular hole, be provided with steam vent in copper plug inside, be provided with osculum in base inside;
Its position and annexation are:
Base, balancing gate pit and pressure head connect to form external structure from bottom to top successively, play and support and the effect of side limit;
Lower permeable stone, soil sample, upper dankness stone, copper plug, pressure sensor connect to form internal structure from bottom to top successively, riseInfiltration, filtration and measurement effect;
The contact position of copper plug and balancing gate pit is provided with sealing ring, and base top and junction, balancing gate pit are provided with sealing ring,Seal;
Osculum and outside connecting place are provided with draining valve, play draining or sealing;
Draining valve top is provided with relieving ring;
Exhaust cap can screw in steam vent, plays exhaust or sealing process.
Two, in simulation open type pile tube pile driving process, produce the test method (abbreviation method) of soil plug effect
This method comprises the following steps:
1. sample preparation
Soil sample is processed into the cylinder sample of designated diameter and height, the density of soil sample, dry density, moisture content are as controlThe soil plug situation of parameter simulated field processed;
2. setting-out
Base is placed on horizontal operation table top, tests under und rained condition soil sample at compression process mesopore for needsPress Changing Pattern time, need to first open draining valve, osculum is filled to water; Permeable stone, soil sample under placing successively on base,Upper dankness stone, copper plug, pressure sensor composition internal structure;
3. assembling
After being assembled into Unified Global, pressure head and balancing gate pit be enclosed within outside above-mentioned internal structure; Adjust balancing gate pit, make steam ventAim at circular hole, exhaust cap screws in steam vent;
4. test
Device is placed in geotechnological triaxial test loading system, and test is divided into the soil plug compression under draining and und rained conditionTest, specific operation process is as follows:
The soil plug compression test of drainage condition:
Draining valve is connected with recycling bin, opens draining valve, the exhaust cap of outwarding winding; Load action on pressure head, loading systemLoad-displacement sensor and pressure sensor synchronous acquisition;
The soil plug compression test of und rained condition:
In osculum, fill water, the external sensor for pore water pressure of draining valve, opens draining valve, screws in exhaust cap; Load actionOn pressure head, sensor for pore water pressure, load-displacement sensor and pressure sensor synchronous acquisition.
The utlity model has following advantages and good effect:
1. in sample making course, using the density of soil sample, moisture content as controlling the reality that parameter can simulated field soil plugSituation;
2. can simulate the soil plug effect under different operating modes by the soil plug compression test under draining and und rained condition;
3. the friction of pile lining and soil plug while utilizing the interface friction of steel pressure chamber and soil sample can simulate actual soil plug effect;
4. collect the difference of data by load-displacement sensor and pressure sensor, can indirectly obtain frictional resistanceSize, test simple possible, the error while having avoided direct measurement frictional resistance;
5. pressure sensor and load-displacement sensor synchronous acquisition, can be reflected in frictional resistance in soil plug compression process in real timeSize;
6. under und rained condition, carry out compression test, can obtain hole and press the Changing Pattern while compression with soil plug;
7. detachable, conveniently stripped rear secondary uses.
In a word, this device can be simulated the soil plug effect producing in open type pile tube pile driving process, uses pressure sensorWith load-displacement sensor synchronous acquisition, the Changing Pattern when obtaining frictional resistance and compressing with soil plug, and also standard is unified, and canRealizing repeatedly industry copies.
Brief description of the drawings
Fig. 1 is the structural representation (main looking) of this device;
Fig. 2 is overlooking of this device and cutting line schematic diagram;
Fig. 3 is the M-M vertical section schematic diagram of this device;
Fig. 4 is that this device is tested schematic diagram in geotechnological three axle loading systems.
In figure:
1-pressure head;
2-balancing gate pit, 2.1-circular hole;
3-base, 3.1-osculum;
4-pressure sensor;
5-copper plug, 5.1-steam vent;
6-upper dankness stone;
7-soil sample;
8-lower permeable stone;
9-draining valve;
10-relieving ring;
11-sealing ring;
12-exhaust cap;
A-sensor for pore water pressure, B-load-displacement sensor.
Detailed description of the invention
Describe in detail below in conjunction with drawings and Examples:
One, device
1, overall
As Fig. 1,2,3, this device comprise pressure head 1, balancing gate pit 2, base 3, pressure sensor 4, copper plug 5, upper dankness stone 6,Soil sample 7, lower permeable stone 8, draining valve 9, relieving ring 10, sealing ring 11 and exhaust cap 12;
In balancing gate pit 2, be provided with circular hole 2.1, be provided with steam vent 5.1 in copper plug 5 inside, be provided with in base 3 insideOsculum 3.1;
Its position and annexation are:
Base 3, balancing gate pit 2 and pressure head 1 connect to form external structure from bottom to top successively, play and support and the effect of side limit;
Lower permeable stone 8, soil sample 7, upper dankness stone 6, copper plug 5, pressure sensor 4 connect to form internal junction from bottom to top successivelyStructure, plays infiltration, filtration and measurement effect;
Copper plug 5 is provided with sealing ring 11 with the contact position of balancing gate pit 2, and base 3 tops and 2 junctions, balancing gate pit are provided with closeSeal 11, seals;
Osculum 3.1 is provided with draining valve 9 with outside connecting place, plays draining or sealing;
Draining valve 9 tops are provided with relieving ring 10;
Exhaust cap 12 can screw in steam vent 5.1, plays exhaust or sealing process.
2, functional part
01) pressure head 1
Pressure head 1 falls two nahlocks of convex shape for a kind of steel, and rigidity is large, and lower nahlock is provided with external screw thread, and push up balancing gate pit 2Portion's internal thread adaptation, can screw in 2 tops, balancing gate pit.
02) balancing gate pit 2
Balancing gate pit 2 is cylinders of a kind of stainless steel, and top is provided with internal thread, can make pressure head 1 screw in; In balancing gate pit 2The position of corresponding steam vent 5.1 is provided with circular hole 2.1, the use of easy to exhaust cap 12; The length of balancing gate pit 2 is according to internal junctionThe size of structure and determining, the external diameter adaptation of internal diameter and soil sample 7, has enough wall thickness that side limit is provided;
Circular hole 2.1 is positioned at balancing gate pit's 2 sidewalls, and position is corresponding with steam vent 5.1, just exhaust cap 12 of the big or small demanding party of circular holeUse.
03) base 3
Base 3 is convex shape, and top is cylinder, and bottom is disk, the design of base can assurance device in loading testTime stability;
Sidewall at cylinder top is provided with groove, is placed with sealing ring 11 in groove;
Be provided with osculum 3.1 in cylinder inside, soil sample 7 can be from osculum 3.1 drainings in the time of compression;
Osculum 3.1 external connection row water valves 9, are provided with relieving ring 10 on draining valve 9, while avoiding balancing gate pit's 2 large displacement to dressThe life of buying property destroys;
Osculum 3.1 is positioned at base 3 inside, can draining in the time that soil sample 7 is compressed, and osculum 3.1 exits connect draining valves9。
04) pressure sensor 4
Pressure sensor 4 is a kind of general-purpose devices, is installed between copper plug 5 and pressure head 1, can Real-time Collection payload data.
05) copper plug 5
Copper plug 5 is a kind of copper cylinder, and the below of sidewall is provided with groove, is placed with sealing ring 11; Bottom surface diameter withThe internal diameter adaptation of balancing gate pit 2, has certain altitude and can ensure rigidity;
Steam vent 5.1 is arranged on copper plug 5 inside, and the outlet of steam vent 5.1 is corresponding with circular hole 2.1, the outlet of steam vent 5.1Place is provided with screw thread, and easy to exhaust cap 12 screws in.
06) upper dankness stone 6
Upper dankness stone 6 is universal component, is arranged on the upper end of soil sample 7, and the internal diameter adaptation of diameter and balancing gate pit 2, can mistakeAir filtering, prevents that the soil particle in soil sample 7 from stopping up steam vent 5.1.
07) soil sample 7
The cylinder sample that soil sample 7 is indoor preparation, density, moisture content conform to the actual conditions of on-the-spot soil plug, bottom surfaceThe internal diameter adaptation of diameter and balancing gate pit 2, the height of soil sample 7 and the ratio of diameter are 2.
08) lower permeable stone 8
Lower permeable stone 8 is universal component, is arranged on the bottom of soil sample 7, and the internal diameter adaptation of diameter and balancing gate pit 2 rises and oozesThoroughly and filtration.
09) draining valve 9
Draining valve 9 is universal component, is provided with fast interface, is connected the draining in controllable device and only with osculum 3.1Water.
10) relieving ring 10
Relieving ring 10 is parts of base 3 self structure, is shaped as the annulus of evagination, and relieving ring 10 is arranged on draining valve9 tops, produce and destroy device can avoid balancing gate pit's 2 large displacement time.
11) sealing ring 11
Sealing ring 11 is quality of rubber materials, is separately positioned on contact position and base 3 tops and the pressure of copper plug 5 and balancing gate pit 2The junction of chamber 2.
12) exhaust cap 12
Exhaust cap 12 ends are provided with external screw thread, and diameter and steam vent 5.1 internal diameter adaptations, can screw in steam vent 5.1.
3, working mechanism
The making of soil sample, taking density, moisture content as controlling index, carrys out the actual conditions of simulated field soil plug; In test,Device is placed in geotechnological triaxial test loading system, and under the effect of load, the relative base 3 in balancing gate pit 2 moves down compressionSoil sample 7; Test is divided into the soil plug compression test under draining and und rained condition.
In experiment, use pressure sensor 4, load-displacement sensor B and sensor for pore water pressure A synchronous acquisition, canObtain under draining and und rained condition, Changing Pattern when frictional resistance compresses with soil plug, and obtain under und rained condition holePress the Changing Pattern while compression with soil plug.
Claims (1)
1. simulate an experimental rig that produces soil plug effect in open type pile tube pile driving process, it is characterized in that:
Comprise pressure head (1), balancing gate pit (2), base (3), pressure sensor (4), copper plug (5), upper dankness stone (6), soil sample (7),Lower permeable stone (8), draining valve (9), relieving ring (10), sealing ring (11) and exhaust cap (12);
On balancing gate pit (2), be provided with circular hole (2.1), be provided with steam vent (5.1) in copper plug (5) inside, in base (3) insideBe provided with osculum (3.1);
Its position and annexation are:
Base (3), balancing gate pit (2) and pressure head (1) connect to form external structure from bottom to top successively, play and support and the effect of side limit;
Lower permeable stone (8), soil sample (7), upper dankness stone (6), copper plug (5), pressure sensor (4) connect to form from bottom to top successivelyInternal structure;
Copper plug (5) is provided with sealing ring (11) with the contact position of balancing gate pit (2), and establish base (3) top and junction, balancing gate pit (2)Be equipped with sealing ring (11);
Osculum (3.1) is provided with draining valve (9) with outside connecting place;
Draining valve (9) top is provided with relieving ring (10);
Exhaust cap (12) can screw in steam vent (5.1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521112544.3U CN205263085U (en) | 2015-12-29 | 2015-12-29 | Simulation open type tubular pile pile sinking in -process produces test device of soil stopper effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521112544.3U CN205263085U (en) | 2015-12-29 | 2015-12-29 | Simulation open type tubular pile pile sinking in -process produces test device of soil stopper effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205263085U true CN205263085U (en) | 2016-05-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521112544.3U Withdrawn - After Issue CN205263085U (en) | 2015-12-29 | 2015-12-29 | Simulation open type tubular pile pile sinking in -process produces test device of soil stopper effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205263085U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424913A (en) * | 2015-12-29 | 2016-03-23 | 中国科学院武汉岩土力学研究所 | Test apparatus for simulating soil plugging effect generated in pile sinking process of open tube pile |
-
2015
- 2015-12-29 CN CN201521112544.3U patent/CN205263085U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424913A (en) * | 2015-12-29 | 2016-03-23 | 中国科学院武汉岩土力学研究所 | Test apparatus for simulating soil plugging effect generated in pile sinking process of open tube pile |
| CN105424913B (en) * | 2015-12-29 | 2017-04-19 | 中国科学院武汉岩土力学研究所 | Test apparatus for simulating soil plugging effect generated in pile sinking process of open tube pile |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160525 Effective date of abandoning: 20170419 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20160525 Effective date of abandoning: 20170419 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |