CN1277996C - Model test equipment for unsaturated earth pile base - Google Patents
Model test equipment for unsaturated earth pile base Download PDFInfo
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- CN1277996C CN1277996C CN03125454.3A CN03125454A CN1277996C CN 1277996 C CN1277996 C CN 1277996C CN 03125454 A CN03125454 A CN 03125454A CN 1277996 C CN1277996 C CN 1277996C
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Abstract
The present invention relates to a test device for unsaturated earth pile foundation models, which is composed of an upper cover, a base and a detachable pressure vessel, wherein a piston rod used for transferring load, a piston sleeve and a valve used for applying air pressure or venting air are arranged on the upper cover, a groove matched with a ceramic plate with a high intake charge value is processed at the center of the base, ceramic plates with high different intake charge values can be arranged in the groove according to requirements, and a spiral slot for discharging gas bubbles is arranged in the bottom of the groove. Thus, the substrate suction of soil samples can be conveniently controlled in tests to realize the test of the load carrying property of model piles in unsaturated soil.
Description
Technical field
The present invention relates in the Soil Mechanics and Foundations Foundation Design a kind of at the indoor pile foundation model test apparatus that carries out pile foundation carrying side mensuration.
Background technology
At present, both at home and abroad the pile foundation test model generally by Model Pile, axially or level to device for measuring force, axially or level form to location moving device, model groove, soil sample etc.If any specific (special) requirements, also the Installation Stress testing arrangement is used to measure the internal stress of pile body on the model pile body, or buries earth pressure cell underground be used to measure the stress distribution situation in the soil body and the size of stress in the soil body of model groove.When carrying out the test of Model Pile, the density of the soil body and water content are generally controlled by predetermined value before test, in process of the test if change soil specimen moisture content, have only means to increase or reduce soil specimen moisture content by adding water or evaporation, be difficult to guarantee that the soil sample water content evenly increases or reduces but change soil specimen moisture content in this way, particularly the soil sample water content reduces the amplitude that Shi Gengnan control water content reduces and guarantees its uniformity.
A lot of pile foundations is arranged in the unsaturation soil body in the engineering, and the water content of the soil body changes with external environment conditions such as Atmospheric precipitation and underground water.Because the matric suction of the soil body changes with its water content, and the variation of the suction of unsaturated soil body (particularly matric suction) has very big influence to the character of the soil body and the load-carrying properties of pile foundation.Present pile foundation model test apparatus is owing to can not change and control the water content of the soil body well in the process of the test, promptly can't change and control the matric suction of the soil body effectively, when causing the load-carrying properties of the pile foundation in the unsaturation soil body being studied, bring very big difficulty for the evaluation and the theory analysis of influence factor by indoor pile foundation model testing.
Summary of the invention
The objective of the invention is: for solving present unsaturated soil pile foundation model test apparatus can not change and control the matric suction of soil sample well in process of the test deficiency, the invention provides a kind of unsaturated soil pile foundation model test apparatus, can be easily according to the test needs, in process of the test, change and control the matric suction size of soil sample, and measure the load-carrying properties of corresponding matric suction drag pile foundation.
For achieving the above object, unsaturated soil pile foundation model test apparatus of the present invention is made up of loam cake, cylindrical shell, base, soil sample and Model Pile, counterforce device, load measuring equipment, location moving device; The piston rod 4 that it is characterized in that piston bush 5 is installed on the loam cake 6 and transmit load is provided with the valve 7 that applies air pressure and exhaust, is provided with the cable aperture 10 that can seal; The groove 27 that the high air-entry value ceramic wafer of one installation is arranged on the base 21, high air-entry value ceramic wafer 29 is fixed in the groove 27 that high air-entry value ceramic wafer is installed, and high air-entry value ceramic wafer 29 can apply the ceramic wafer of the magnitude range replacing different model of matric suction according to unsaturated soil; Base 21 is provided with qi of chong channel ascending adversely bulb apparatus 24 and measuring equipment 25 is pressed in the hole; Load sensor 14 is installed in 16 tops of Model Pile by stake apical grafting head 15 and transmits between the piston rod 4 of load.
At first process the demountable pressure vessel that can hold soil sample and Model Pile of a loam cake and base, the size of pressure vessel is according to the size decision of the character and the Model Pile of soil sample, and the voltage endurance capability of pressure vessel depends on the size of soil sample matric suction.When carrying out the pile foundation model testing, elder generation is according to the size of test matrix suction, select suitable high air-entry value ceramic wafer to be fixed in the groove of base, and guarantee that its periphery seals, by certain procedure that high air-entry value ceramic wafer is saturated then, weather strip between mounting seat and the cylindrical shell and cylindrical shell successively are securely fixed in cylindrical shell on the base with bolt again, and guarantee sealing.The required soil sample of test is got ready by predetermined water content, according to calculating good dry density layering filling soil sample in advance.If simulation perfusion preformed pile according to the position of stake, is provided with Model Pile at predetermined position when the filling soil sample, after soil sample and Model Pile are ready, a stake apical grafting head unit is installed, simultaneously piston rod is carried in load sensor and load transfer and connect; If the simulation preformed pile, treat that then soil sample fills after, Model Pile is carried piston rod by stake apical grafting head unit and load sensor and load transfer connects; After the piston rod that Model Pile, stake apical grafting head unit, load sensor and load transfer are carried connected, the load sensor cable was drawn and is guaranteed from loam cake and seals, and with bolt loam cake and cylindrical shell was connected firmly, and guaranteed sealing.Apply certain air pressure according to the size of the matric suction pressure hole by loam cake to soil sample, the variation with matric suction of can the test model pile in this process carrying performance can also be measured under the certain substrate suction load-carrying properties of Model Pile in the unsaturation soil body behind the ready to balance.
Because this experimental rig is provided with removable high air-entry value ceramic wafer on the base of pressure vessel, thereby make when adopting this experimental rig to carry out the pile foundation model testing, can change and control unsaturation soil sample matric suction by pressure vessel being applied different air pressure, realize the pile foundation model testing test in the unsaturation soil body easily.
Description of drawings
Fig. 1 is a unsaturated soil pile foundation model test apparatus
Fig. 2 is the base plane figure of cylindrical pressure vessel.
Fig. 3 is a base A-A sectional drawing.
As shown in the figure: counterforce device 1, location moving device 2, piston rod connecting device 3, piston rod 4, piston bush 5, loam cake 6, valve 7, last box nut 8, last bonnet bolt 9, cable hole 10, last seal groove 11, last weather strip 12, load sensor cable 13, load sensor 14, stake apical grafting head 15, Model Pile 16, soil sample 17, cylindrical shell 18, lower seal bar 19, lower seal groove cavity 20, base 21, base nut 22, bolt of lower base 23, qi of chong channel ascending adversely bulb apparatus 24, measuring equipment 25 is pressed in the hole, logical spiral slot centre bore 26, the groove 27 of high air-entry value ceramic wafer is installed, spiral slot 28, high air-entry value ceramic wafer 29, logical spiral slot lateral opening 30.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.Fig. 1 is the unsaturated soil pile foundation model equipment that the present invention adopts the cylinder type pressure vessel, before testing, earlier used soil sample 17 is carried out suitable processing and necessary soil nature parametric measurement, need to obtain the soil-water characteristic curve of soil sample 17 especially, so that when carrying out the unsaturation pile foundation test, can accurately control the matric suction of soil sample 17 by control air pressure according to the soil-water characteristic curve of soil sample 17.
When testing, earlier the spiral slot lateral opening 30 of the qi of chong channel ascending adversely bulb apparatus on the base 21 24 with logical spiral slot 28 connected, press the measuring equipment 25 and the spiral slot centre bore 26 of logical spiral slot 28 to connect in the hole, the high air-entry value ceramic wafer 29 that will be fixed on then on the base 21 is saturated.Lower seal bar 19 is placed in the lower seal groove cavity 20, cylindrical shell 18 is fixed on the base 21, begin then Model Pile 16 (as being driven pile, then only loading soil sample) to be installed by predetermined dry density and water content filling soil sample 17 with bolt of lower base 23 and base nut 22.After soil sample 17 and Model Pile 16 are ready, load sensor 14 is installed in Model Pile 16 tops, and the load sensor cable 13 of load sensor 14 drawn by the cable hole 10 that is positioned at loam cake 6 and guarantees sealing, prevent that gas from leaking by stake apical grafting head 15.After ready, to go up weather strip 12 and be placed in seal groove interior 11, using bonnet bolt 9 and last box nut 8 is fixed on loam cake 6 on the cylindrical shell 18, note being connected of piston rod 4 and Model Pile 16 top load sensors 14 simultaneously, after installing, the loam cake 6 of cylindrical shell 18 can apply air pressure by the valve on the loam cake 67 by predetermined matric suction, treat that soil sample 17 just can carry out the pile foundation model testing in the unsaturated soil under the certain substrate suction after this air pressure is issued to balance, load on the Model Pile 16 is provided by the counterforce device 1 at piston rod 4 tops, the displacement at Model Pile 16 tops by with the piston rod connecting device 3 that is installed in piston rod 4 tops on location moving device 2 measure.
Unsaturated soil pile foundation model test apparatus of the present invention can be according to the needs of test, and the matric suction of control soil sample carries out the pile foundation model testing in the unsaturation soil body easily.Simple in structure, easy to operate.
Claims (2)
1. a unsaturated soil pile foundation model test apparatus is made up of loam cake, cylindrical shell, base, soil sample and Model Pile, counterforce device, load measuring equipment, location moving device; The piston rod (4) that it is characterized in that piston bush (5) is installed on the loam cake (6) and transmit load is provided with the valve (7) that applies air pressure and exhaust, is provided with the cable aperture (10) that can seal; The groove (27) that the high air-entry value ceramic wafer of one installation is arranged on the base (21), high air-entry value ceramic wafer (29) are fixed in the groove (27) that high air-entry value ceramic wafer is installed, and base (21) is provided with qi of chong channel ascending adversely bulb apparatus (24) and measuring equipment (25) is pressed in the hole; Load sensor (14) is installed between Model Pile (16) stake top and the piston rod (4) by stake apical grafting head (15).
2. unsaturated soil pile foundation model test apparatus according to claim 1, it is characterized in that being fixed on base (21) and go up the interior high air-entry value ceramic wafer (29) of groove (27) that high air-entry value ceramic wafer is installed, can apply the ceramic wafer of the magnitude range replacing different model of matric suction according to unsaturated soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03125454.3A CN1277996C (en) | 2003-09-26 | 2003-09-26 | Model test equipment for unsaturated earth pile base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03125454.3A CN1277996C (en) | 2003-09-26 | 2003-09-26 | Model test equipment for unsaturated earth pile base |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1600998A CN1600998A (en) | 2005-03-30 |
| CN1277996C true CN1277996C (en) | 2006-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03125454.3A Expired - Fee Related CN1277996C (en) | 2003-09-26 | 2003-09-26 | Model test equipment for unsaturated earth pile base |
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| CN (1) | CN1277996C (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006234648A (en) * | 2005-02-25 | 2006-09-07 | Jiban Shikensho:Kk | Method for quick loading test of pile |
| CN101592588B (en) * | 2009-06-23 | 2012-01-04 | 中国海洋石油总公司 | Pile soil interaction mechanism testing device for riser |
| CN102095640B (en) * | 2011-01-20 | 2012-10-03 | 中国科学院武汉岩土力学研究所 | Device for testing influence of multiphase flow on tensile strength of rock |
| CN103195112B (en) * | 2013-04-18 | 2014-10-08 | 四川建筑职业技术学院 | Foundation pile foundation model analyzing method and test device for same |
| CN104502197B (en) * | 2014-12-31 | 2017-08-11 | 南京林业大学 | A kind of continuous pre-compression test method of medium density fibre board (MDF) slab |
| CN104763002B (en) * | 2015-04-22 | 2016-08-24 | 上海山顺土木工程技术有限公司 | Bored pile guide test system |
| CN105547841B (en) * | 2015-12-11 | 2018-03-20 | 中国科学院武汉岩土力学研究所 | Confined pressure controllable rock side friction test device and its method |
| 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 |
| CN105424487B (en) * | 2016-01-11 | 2017-12-05 | 中国科学院武汉岩土力学研究所 | The experimental rig and its method of static pressure steel-pipe pile pile driving process under the conditions of simulation confined pressure |
| CN108360577B (en) * | 2018-02-06 | 2019-11-08 | 太原理工大学 | Simulate the torque loading device and method of stake top linearly or nonlinearly deflection constraint |
| CN109469110B (en) * | 2018-10-22 | 2021-12-28 | 山东大学 | Rigid connection device for pile and bearing platform for pile foundation model test and assembling method |
| CN111021440A (en) * | 2020-03-07 | 2020-04-17 | 西南交通大学 | CPT integrated geotechnical packaging granular pile indoor model test device and method |
| CN112798418A (en) * | 2021-01-29 | 2021-05-14 | 贵州民族大学 | Experimental device for observe and measure stake soil interact of unsaturated soil |
-
2003
- 2003-09-26 CN CN03125454.3A patent/CN1277996C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1600998A (en) | 2005-03-30 |
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Owner name: WUHAN MUNICIPAL WORKS DESIGN INSTITUTE ROMPLAST- Free format text: FORMER OWNER: WUHAN INST. OF ROCK AND SOIL MECHANICS, CHINESE ACADEMY OF SCIENCES Effective date: 20090731 |
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Effective date of registration: 20090731 Address after: No. 40, Changqing Road, Jianghan District, Hubei, Wuhan Patentee after: WUHAN MUNICIPAL ENGINEERING DESIGN & RESEARCH INSTITUTE Co.,Ltd. Address before: No. 25, little Hongshan, Wuchang District, Wuhan, Hubei Patentee before: INSTITUTE OF ROCK AND SOIL MECHANICS, CHINESE ACADEMY OF SCIENCES |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20061004 Termination date: 20210926 |