CN109853646A - Foundation pit artesian water precipitation simulation laboratory test device and its test method - Google Patents

Foundation pit artesian water precipitation simulation laboratory test device and its test method Download PDF

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Publication number
CN109853646A
CN109853646A CN201910263712.5A CN201910263712A CN109853646A CN 109853646 A CN109853646 A CN 109853646A CN 201910263712 A CN201910263712 A CN 201910263712A CN 109853646 A CN109853646 A CN 109853646A
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China
Prior art keywords
water
casing
test
soil layer
pipe
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CN201910263712.5A
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Chinese (zh)
Inventor
黄留新
周爱兆
葛鹏
王威
刘刚
王炳辉
隋晓岚
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Third Geological Team Of Jiangsu Bureau Of Geology And Mineral Resources
Jiangsu University of Science and Technology
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Third Geological Team Of Jiangsu Bureau Of Geology And Mineral Resources
Jiangsu University of Science and Technology
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Priority to CN201910263712.5A priority Critical patent/CN109853646A/en
Publication of CN109853646A publication Critical patent/CN109853646A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a kind of foundation pit artesian water precipitation simulation laboratory test device and its test method, which includes model casing and water_air exchange instrument, and model casing is connected to by water supplying pipe with water_air exchange instrument.The Precipitation Process of the unit simulation foundation pit artesian aquifer, WATER LEVEL CHANGES can be monitored simultaneously, accuracy in detection is higher, can provide reference for base pit dewatering design parameter and construction, guarantee the accuracy and safety of excavation of foundation pit precipitation, provides reliable parameter for base pit dewatering design.

Description

Foundation pit artesian water precipitation simulation laboratory test device and its test method
Technical field
The present invention relates to experimental provision and test method, in particular to foundation pit artesian water precipitation simulation laboratory test device and Its test method.
Background technique
In strand, riparian area not only rich groundwater, but also the alternating layers between foundation soil Chang Chengqiang, aquiclude point Cloth, earth excavation lead to aqueous fault rupture, and due to the effect of pressure difference, a large amount of underground water will necessarily be flowed into foundation pit.In engineering Foundation pit deformation caused by artesian water acts on and destabilization problems are one of the material risk sources of such regional deep-foundation pit engineering, if too late The work of Shi Jinhang Yield rainfall relation, foundation pit, which persistently seeps water, will cause construction condition variation and foundation bearing capacity decline, to guarantee The safety and stability of excavation of foundation pit, it is often necessary to which Dewatering by pressure reduction is carried out to artesian aquifer.In order to determine practical foundation pit dewatering project In parameters, simulated in advance frequently with the laboratory test operated conveniently.During the test, water-level observation is especially It is important.Since model test size wants small more than scene, water level observation device will take into account the required precision and operation of model test The requirement of simple and flexible.In order to guarantee the pressure-bearing property in water-bearing layer, for the control of piezometric head need with accuracy with Convenience.
It is found by being retrieved to existing technical literature:
Chinese patent 201310303890.9 discloses a kind of simulation laboratory test side of pile foundation obstruction seepage action of ground water Method, the test consider pile foundation to the influence situation of seepage action of ground water in Precipitation Process, but have the following disadvantages (1) test soil Layer is single-layer soil, and the soil body number of plies is difficult to simulate true subsurface picture;(2) can only seepage flow situation in the case of simulated diving layer, nothing Precipitation and seepage action of ground water situation in the case of method simulation artesian aquifer;Chinese patent 201510759865.0, discloses one The experimental provision in kind teaching simulation water-bearing layer, the device have the following disadvantages (1) using water bag simulation artesian aquifer It is limited for the simulation context of water pressure, the size of simulated water pressure power is not controlled intuitively;(2) using water packed water come mould Quasi- water-bearing layer, water are not contacted with the soil body, and simulation excessively idealizes.
Summary of the invention
Goal of the invention: it is an object of the present invention to provide the Precipitation Process of simulation foundation pit artesian aquifer, while can monitor ground The experimental provision of lower SEA LEVEL VARIATION.
It is a further object of the present invention to provide the experimental methods of the experimental provision.
Technical solution: the present invention provides a kind of foundation pit artesian water precipitation simulation laboratory test device, including model casing and water Gas exchanges instrument, and model casing is connected to by water supplying pipe with water_air exchange instrument.
Further, simulation soil layer is held inside the model casing, setting downcast well pipe and monitoring well casing in simulation soil layer, Cover board is covered on simulation soil layer, cover board is set on downcast well pipe and monitoring well casing, and water supplying pipe is laid on model chamber interior wall, is supplied water Pipe stretches out model casing and is connected to water_air exchange instrument, scale and glass tube is also set up on model chamber interior wall, the glass tube passes through Hose is connected to monitoring well casing.The downcast well pipe tube wall apertured is filtered as filtering material is coated outside fillter section, fillter section Plugging material is filled above material, is connect above downcast well pipe with water plug.The monitoring well tube wall apertured is as filtering Filtering material is coated outside section, fillter section, fills plugging material above filtering material.The water_air exchange instrument is by water supply chamber, control Panel processed is constituted with pneumatic supply is stablized.The water supply chamber is by water inlet pipe, air inlet, gas vent, hollow isolation film and outlet pipe structure At outlet pipe is connect with water supplying pipe, and water inlet pipe is connected to external water source.The model casing is cuboid or cylindrical body.
Explanation is further explained to above-mentioned technical proposal below:
Pressure is applied to underground water to simulate artesian aquifer by using water_air exchange instrument, can guarantee artesian aquifer The stability of hydraulic pressure, overcome in the prior art simulate Method on Dewatering of Foundation Pit in more difficult simulation artesian aquifer there are the shortcomings that. Upper overburden layer load can be increased by applying pressure to cover plate of upper layer, while can pass through inspection well Observable different depth underground water The situation of change of position.Model casing requires some strength, rigidity in the experimental rig, transparent, shape be rectangle or circle, Scale is set on the inner wall of model casing side.The simulation soil layer being arranged in model casing will be consistent with practical soil layer, with practical soil layer For prototype, simulation soil layer physical property is close with practical soil layer, and reduced scale determines size according to a certain percentage.It is arranged in simulation soil Cover board on layer can be used the material same or different with model casing, according to the size and position of downcomer in phase on cover board Position aperture is answered, the material of cover board there will be certain bearing capacity, can be further applied load on the cover board when necessary, aqueous to improve pressure-bearing The pressure-bearing property of layer.The downcast well pipe and monitoring well casing, material being embedded among soil layer can according to need selection, can such as select Pvc pipe etc., size should be obtained by reduced scale in proportion, and downcast well pipe burrows with monitoring well casing in lower half portion, and covers brocade Synthetic fibre or gauze etc., to simulate the fillter section of practical well casing.Scale on model chamber interior wall, the glass being attached on inner wall The hose composition water-level observation meter for monitoring well, connection glass tube and the monitoring well manage, being embedded in soil layer, glass tube, monitoring well Linker is formed with hose, so that the SEA LEVEL VARIATION in observation foundation pit becomes more intuitive.It is arranged in the water supplying pipe of model casing surrounding Can according to need using different materials, the size of water supplying pipe is selected according to actual needs, on water supplying pipe with aquifer Corresponding portion punching, connect with water_air exchange instrument, as water channel, simulates the artesian aquifer in practical foundation pit.Water is provided The water_air exchange instrument of pressure is made of control panel, stable pneumatic supply and water supply chamber.Water supply chamber is by water inlet pipe, outlet pipe, exhaust Hole, air inlet and isolation film composition.The water inlet pipe of water supply chamber is connect with water source (such as tap water), and water enters confession by water inlet pipe In water chamber, pressure value is determined by control panel, injects air into isolation film by stablizing pneumatic supply, makes that membrane swelling is isolated, To supplying water, indoor water applies pressure.The outlet pipe of water supply chamber is connect with the water supplying pipe for being arranged in model casing surrounding, from water The water in source provides pressure through water_air exchange instrument, is entered in the model casing soil body by water supplying pipe, the source as water pressure.
The experimental method of the foundation pit artesian water precipitation simulation laboratory test device, includes the following steps:
A, composition model case: size production model casing fixes water supplying pipe in model chamber interior wall reference mark as requested In model chamber interior wall, the aperture on water supply tube wall;
B, configuration simulation soil layer: requiring according to Practical Project site soil layers, and configuration simulation soil layer is measured by soil test The physico-chemical property of soil layer is simulated, is guarantee test accuracy, when configuration should ensure that the physico-chemical property and practical soil layer of simulation soil layer It is consistent;
C, it is laid with simulation soil layer: surveying report according to Practical Project place, measure each soil thickness, and in model casing Be laid with soil layer, the clay distribution in model casing changed according to the clay distribution of different engineerings, when being laid with soil layer, by downcast well pipe and Monitoring well casing is embedded in soil layer, and fills filtering material and plugging material in well casing surrounding;
D, it assembles water_air exchange instrument: each section in water_air exchange instrument being assembled, water inlet pipe is connect with external water source, outlet pipe It is connect with water supplying pipe;
E, water filling consolidation: opening the gas vent of water supply chamber, will fill water in water supply chamber by water inlet pipe, empties in water supply chamber Gas vent is closed after air, air inlet is connect with air compressor, opens air compressor, air is injected into water supply chamber, By the expansion of hollow isolation film, to supplying water, indoor water provides pressure, controls water pressure situation by control panel, when reaching It when the water pressure needed, is filled the water into model casing, by water level in scale observing and nursing case, when monitoring well casing stable level and mould Quasi- soil layer surface stops supplying water when having water exudation, and record monitoring well casing water level, the subsequent soil body starts self weight consolidation, works as solum settlement It measures continuous three days and is less than 0.01mm/d, then reach test requirements document;
F, it tests: pumping equipment is connect with downcast well pipe, water inlet pipe is connect with water_air exchange instrument, opens gas vent, will Water supply chamber fills water, by control panel setup pressure value, by the water with pressure by opening in water inlet pipe injection model case Pumping equipment extracts the water in soil layer, passes through SEA LEVEL VARIATION situation in glass tube observing earth.Other can also be buried in soil layer Monitoring device obtains corresponding monitoring data.
Further, operation test is carried out before the test, when monitoring well casing water level keeps initial water level constant, in glass When precipitation funnel can be observed in pipe, show normal operation.
The utility model has the advantages that simulation soil layer of the invention meets true sub-surface situation, the drop of artesian aquifer can be simulated Regimen condition, water pressure is controllable, and can intuitively observe hydraulic pressure, and water is contacted with soil layer, and accuracy in detection is higher.The present invention is relatively applicable in In indoor simulation foundation pit artesian water Precipitation Process, reference is provided for base pit dewatering design parameter and construction, guarantees excavation of foundation pit drop The accuracy and safety of water provide reliable parameter for base pit dewatering design.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention;
Fig. 2 is water_air exchange instrument structural schematic diagram of the invention;
Fig. 3 is water supply chamber structural schematic diagram of the invention;
Fig. 4 is downcast well pipe structural schematic diagram of the invention;
Fig. 5 is monitoring well casing structural schematic diagram of the invention;
Fig. 6 is water-level observation meter structural schematic diagram of the invention;
Fig. 7 is scale schematic diagram of the invention.
Specific embodiment
As shown in Figure 1, the foundation pit artesian water precipitation simulation laboratory test apparatus structure of the present embodiment includes two large divisions: mould Molding box 1 and water_air exchange instrument 8, model casing 1 are connected to by water supplying pipe 7 with water_air exchange instrument 8.Structure about model casing 1 is as schemed 1, simulation soil layer 2 is held inside model casing 1, the water-bearing layer at 2 middle part of simulation soil layer is artesian aquifer.It is set in simulation soil layer 2 Downcast well pipe 4 and monitoring well casing 5 are set, simulates and covers cover board 3 on soil layer 2, cover board 3 is set in downcast well pipe 4 and monitoring well casing 5 On, water supplying pipe 7 is laid on 1 inner wall of model casing, water supplying pipe 7 stretches out model casing 1 and is connected to water_air exchange instrument 8,1 inner wall of model casing On also set up scale 61 (as shown in Figure 7) and glass tube 62, glass tube 62 is connected to by hose 63 with well casing 5 is monitored.Wherein, such as Shown in Fig. 2, water_air exchange instrument 8 is made of water supply chamber 81, control panel 82 and stable pneumatic supply 83.Model casing 1 in the present embodiment Structure be cuboid.
As illustrated in figures 4-5, the external structure of downcast well pipe 4 and monitoring well casing 5 is essentially identical, and downcast well pipe 4 is beaten in tube wall Plugging material 41, dewatering well are filled above filtering material 43 as filtering material 43 is coated outside fillter section 42, fillter section 42 in hole 4 top of pipe is connect with water plug 9.In the same manner, monitoring 5 tube wall apertured of well casing outside fillter section 52, fillter section 52 as coating Filtering material 53 fills plugging material 51 above filtering material 53.
As shown in figure 3, water supply chamber 81 is by water inlet pipe 811, air inlet 812, gas vent 815, hollow isolation film 813 and water outlet Pipe 814 is constituted, and outlet pipe 814 is connect with water supplying pipe 7, and water inlet pipe 811 is connected to external water source.
The production of the experimental provision of the present embodiment and experimentation are as follows:
(1) size makes model casing 1 as requested, having a size of 2m*1.5m*1m, in 1 inner wall reference mark of model casing, 61 model It encloses for 0~70cm, water supplying pipe 7 is individually fixed in 1 four jiaos of model casing, in 7 corresponding position aperture of water supplying pipe;
(2) it is required according to Practical Project site soil layers, configuration simulation soil layer 2 measures simulation soil layer 2 by soil test Fundamental characteristics, such as severe, moisture content, infiltration coefficient are guarantee test accuracy, and when configuration should ensure that the spy of simulation soil layer 2 Property is consistent with practical soil layer;
(3) report is surveyed according to Practical Project place, reduced scale obtains each soil thickness in proportion, is laid in model casing 1 Soil layer, upper layer are 15cm thickness clay, and centre is 40cm thickness silty clay, and lower part is 15cm thickness clay;
(4) water supply chamber 81 in water_air exchange instrument 8, control panel 82 are assembled and stablizes each sections such as pneumatic supply 83, it will originally Water is connected with water inlet pipe 811 in water supply chamber 81, will fill water in water supply chamber 81 by water inlet pipe 811, empties the sky in water supply chamber Air compressor is connect by gas with air inlet 812, and the pressure needed by the setting of control panel 82 is opened and stablizes pneumatic supply, to Air is injected in water supply chamber 81, by the expansion of hollow isolation film 813, is provided pressure to the water in water supply chamber 81, is passed through control Panel 82 controls water pressure situation and fills the water when reaching the water pressure of needs into model casing 1;
(5) by water level in water-level observation meter (as shown in Figure 6) observing and nursing case 1, when monitoring 5 water level of well casing reaches requirement And stop supplying water when keeping stablizing, hourly observation Well Water Level, the subsequent soil body starts self weight consolidation, continuous three days when solum settlement amount Less than 0.01mm/d, then it is assumed that reach test requirements document;
(6) it operation test: keeps initial water level constant when monitoring 5 water level of well casing, precipitation can be observed in glass tube 62 When funnel, show normal operation, formal test can be carried out;
(7) it tests: pumping equipment 9 is connect with downcast well pipe 4, water inlet pipe 811 is connect with water_air exchange instrument 8, the row of opening Water supply chamber 81 is filled water by stomata 815, and by 82 setup pressure value of control panel, the water with pressure is passed through water inlet pipe 811 In injection model case 1, the water in the extraction soil layer of pumping equipment 9 is opened, SEA LEVEL VARIATION situation in 62 observing earth of glass tube is passed through.

Claims (10)

1. a kind of foundation pit artesian water precipitation simulation laboratory test device, it is characterised in that: including model casing (1) and water_air exchange instrument (8), model casing (1) is connected to by water supplying pipe (7) with water_air exchange instrument (8).
2. foundation pit artesian water precipitation simulation laboratory test device according to claim 1, it is characterised in that: the model casing (1) internal to hold simulation soil layer (2), setting downcast well pipe (4) and monitoring well casing (5), are simulated soil layer (2) in simulation soil layer (2) Upper covering cover board (3), cover board (3) are set on downcast well pipe (4) and monitoring well casing (5), and model casing (1) inner wall lays water supplying pipe (7), water supplying pipe (7) is stretched out and model casing (1) and is connected to water_air exchange instrument (8), model casing (1) inner wall also set up scale (61) and Glass tube (62), the glass tube (62) are connected to by hose (63) with monitoring well casing (5).
3. foundation pit artesian water precipitation simulation laboratory test device according to claim 2, it is characterised in that: the simulation soil Water-bearing layer in the middle part of layer (2) is artesian aquifer.
4. foundation pit artesian water precipitation simulation laboratory test device according to claim 1, it is characterised in that: the dewatering well (4) tube wall apertured is managed as filtering material (43) are coated outside fillter section (42), fillter section (42), is filled out above filtering material (43) It fills plugging material (41), is connect above downcast well pipe (4) with water plug (9).
5. foundation pit artesian water precipitation simulation laboratory test device according to claim 1, it is characterised in that: the monitoring well (5) tube wall apertured is managed as filtering material (53) are coated outside fillter section (52), fillter section (52), is filled out above filtering material (53) Fill plugging material (51).
6. foundation pit artesian water precipitation simulation laboratory test device according to claim 1, it is characterised in that: the aqueous vapor is handed over Instrument (8) is changed by water supply chamber (81), control panel (82) and stablizes pneumatic supply (83) and constitutes.
7. foundation pit artesian water precipitation simulation laboratory test device according to claim 6, it is characterised in that: the water supply chamber (81) it is made of water inlet pipe (811), air inlet (812), gas vent (815), hollow isolation film (813) and outlet pipe (814), out Water pipe (814) is connect with water supplying pipe (7), and water inlet pipe (811) is connected to external water source.
8. foundation pit artesian water precipitation simulation laboratory test device according to claim 1, it is characterised in that: the model casing It (1) is cuboid or cylindrical body.
9. a kind of test method of foundation pit artesian water precipitation simulation laboratory test device as described in claim 1, feature exist In: include the following steps:
A, composition model case (1): size production model casing (1) as requested will in model casing (1) inner wall reference mark (61) Water supplying pipe (7) is fixed on model casing (1) inner wall, the aperture on water supplying pipe (7) tube wall;
B, configuration simulation soil layer (2): requiring according to Practical Project site soil layers, and configuration simulation soil layer (2) is surveyed by soil test The physico-chemical property of soil layer (2) must be simulated, be guarantee test accuracy, when configuration should ensure that the physico-chemical property of simulation soil layer (2) with Practical soil layer is consistent;
C, it is laid with simulation soil layer (2): surveying report according to Practical Project place, measure each soil thickness, and in model casing (1) Middle laying soil layer changes the clay distribution in model casing (1) according to the clay distribution of different engineerings, when being laid with soil layer, by precipitation Well casing (4) and monitoring well casing (5) are embedded in soil layer, and fill filtering material (43), (53) and plugging material in well casing surrounding (41),(51);
D, water_air exchange instrument (8) are assembled: each section in water_air exchange instrument (8) is assembled, water inlet pipe (811) and external water source connect It connects, outlet pipe (814) is connect with water supplying pipe (7);
E, water filling consolidation: opening the gas vent (815) of water supply chamber (81), will fill water in water supply chamber (81) by water inlet pipe (811), Gas vent (815) are closed after emptying the air in water supply chamber (81), air inlet (812) is connect with air compressor, are opened empty Air compressor injects air into water supply chamber (81), by the expansion of hollow isolation film (813), to the water in water supply chamber (81) Pressure is provided, controls water pressure situation by control panel (82), when reaching the water pressure of needs, the note into model casing (1) Water, by scale (61) observing and nursing case (1) interior water level, when monitoring well casing (5) stable level and there is water on simulation soil layer (2) surface Stop supplying water when exudation, record monitoring well casing (5) water level, the subsequent soil body starts self weight consolidation, continuous three days when solum settlement amount Less than 0.01mm/d, then reach test requirements document;
F, it tests: pumping equipment (9) is connect with downcast well pipe (4), water inlet pipe (811) is connect with water_air exchange instrument (8), is opened Water supply chamber (81) is filled water by gas vent (815), and by control panel (82) setup pressure value, the water with pressure is passed through In water inlet pipe (811) injection model case (1), the water in pumping equipment (9) extraction soil layer is opened, glass tube (62) observing earth is passed through Middle SEA LEVEL VARIATION situation.
10. the test method of foundation pit artesian water precipitation simulation laboratory test device according to claim 9, feature exist In: the step f test before carry out operation test, when monitoring well casing (5) water level keep initial water level it is constant, in glass tube (62) when precipitation funnel can be observed in, show normal operation.
CN201910263712.5A 2019-04-02 2019-04-02 Foundation pit artesian water precipitation simulation laboratory test device and its test method Pending CN109853646A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111456118A (en) * 2020-04-05 2020-07-28 席早阳 Foundation pit model test device for simulating underground water level change in foundation pit excavation process
CN112663692A (en) * 2020-12-31 2021-04-16 东北电力大学 Model test tank system and method considering soil body in-situ stress state
CN113640188A (en) * 2021-06-01 2021-11-12 上海交通大学 Testing device and method for simulating in-situ stress field of clay stratum around pile

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111456118A (en) * 2020-04-05 2020-07-28 席早阳 Foundation pit model test device for simulating underground water level change in foundation pit excavation process
CN112663692A (en) * 2020-12-31 2021-04-16 东北电力大学 Model test tank system and method considering soil body in-situ stress state
CN113640188A (en) * 2021-06-01 2021-11-12 上海交通大学 Testing device and method for simulating in-situ stress field of clay stratum around pile

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