CN210049297U - Indoor simulation test device for confined water precipitation of foundation pit - Google Patents
Indoor simulation test device for confined water precipitation of foundation pit Download PDFInfo
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- CN210049297U CN210049297U CN201920440142.8U CN201920440142U CN210049297U CN 210049297 U CN210049297 U CN 210049297U CN 201920440142 U CN201920440142 U CN 201920440142U CN 210049297 U CN210049297 U CN 210049297U
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Abstract
The utility model discloses an indoor analogue test device of foundation ditch confined water precipitation, the device include mold box and aqueous vapor exchange appearance, and the mold box passes through delivery pipe and aqueous vapor exchange appearance intercommunication. The device simulates the precipitation process of a confined aquifer of the foundation pit, can monitor the change of the ground water level, has higher detection accuracy, can provide reference for the design parameters and construction of the precipitation of the foundation pit, guarantees the accuracy and the safety of the precipitation of the foundation pit excavation, and provides reliable parameters for the design of the precipitation of the foundation pit.
Description
Technical Field
The utility model relates to an experimental apparatus, in particular to indoor analogue test device of foundation ditch confined water precipitation.
Background
In coastal areas and along rivers, underground water is abundant, a foundation soil layer is often distributed in a mutual layer mode between strong permeable layers and weak permeable layers, the aquifer is broken due to earth excavation, and a large amount of underground water can flow into a foundation pit inevitably under the action of pressure difference. The problem of foundation pit deformation and instability caused by confined water action in engineering is one of major risk sources of deep foundation pit engineering in the region, if the foundation pit is not drained in time, the foundation pit continuously seeps water to cause the field construction condition to be poor and the foundation bearing capacity to be reduced, and in order to ensure the safety and stability of foundation pit excavation, the confined aquifer is often required to be decompressed and subjected to precipitation. In order to determine various parameters in actual foundation pit dewatering engineering, indoor tests which are convenient to operate are often adopted for pre-simulation. During the test, water level observation is particularly important. Because the size of the model test is far smaller than that of the field, the water level observation device has the requirements of both the precision requirement of the model test and the simple and flexible operation. In order to ensure the pressure bearing performance of the aquifer, the accuracy and convenience for controlling the water pressure of the aquifer are required.
Through the search of documents in the prior art, the following results are found:
chinese patent 201310303890.9 discloses an indoor simulation test method for a pile foundation to hinder groundwater seepage, which considers the influence of the pile foundation on groundwater seepage in the precipitation process, but has the following disadvantages that (1) the test soil layer is single-layer soil, and the number of soil layers is difficult to simulate the real underground condition; (2) the seepage condition under the condition of a submerged layer can be simulated only, and the rainfall and groundwater seepage condition under the condition of a confined aquifer cannot be simulated; chinese patent 201510759865.0 discloses an experimental device for simulating aquifer for teaching, which uses water bag to simulate confined aquifer, but has the following disadvantages that (1) the simulation range of water pressure is limited, and the magnitude of simulated water pressure is not intuitively controlled; (2) the aquifer is simulated by using water filled in the water, the water is not contacted with the soil body, and the simulation is over-ideal.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a simulation foundation ditch confined aquifer's precipitation process can monitor the experimental apparatus that groundwater level changed simultaneously.
The technical scheme is as follows: the utility model provides an indoor analogue test device of foundation ditch confined water precipitation, including mold box and aqueous vapor exchange appearance, the mold box passes through delivery pipe and aqueous vapor exchange appearance intercommunication.
Further, the inside simulation soil layer that holds of model box sets up precipitation well pipe and monitoring well pipe in the simulation soil layer, covers the apron on the simulation soil layer, and the apron cover is established on precipitation well pipe and monitoring well pipe, lays the delivery pipe on the model box inner wall, and the delivery pipe stretches out the model box and communicates with aqueous vapor exchange appearance, still sets up scale and glass pipe on the model box inner wall, the glass pipe passes through hose and monitoring well pipe intercommunication. The pipe wall of the precipitation well pipe is provided with holes as a first filtering section, a first filtering material is coated outside the first filtering section, a plugging material is filled above the first filtering material, and the upper part of the precipitation well pipe is connected with a water pumping device. And holes are arranged on the pipe wall of the monitoring well pipe and used as a second filtering section, a second filtering material is coated outside the second filtering section, and a plugging material is filled above the second filtering material. The water-gas exchanger consists of a water supply chamber, a control panel and a stable air pressure source. The water supply chamber is composed of a water inlet pipe, an air inlet hole, an air exhaust hole, a hollow isolating membrane and a water outlet pipe, the water outlet pipe is connected with a water supply pipe, and the water inlet pipe is communicated with an external water source. The model box is a cuboid or a cylinder.
The above technical solution is further explained as follows:
the confined aquifer is simulated by applying pressure to the underground water by the water-gas exchanger, the stability of the water pressure of the confined aquifer can be ensured, and the defect that the confined aquifer is difficult to simulate in a foundation pit precipitation simulation method in the prior art is overcome. The upper cover plate is pressurized to increase the load of the upper covering soil layer, and meanwhile, the change conditions of underground water levels at different depths can be observed through the observation well. The model box in the test device is required to have certain strength and rigidity, is transparent and is rectangular or circular, and scales are arranged on the inner wall of one side of the model box. The simulated soil layer arranged in the model box is required to be consistent with the actual soil layer, the actual soil layer is taken as a prototype, the physical property of the simulated soil layer is required to be close to the actual soil layer, and the size is determined according to a certain scale. The cover plate arranged on the simulated soil layer can be made of the same or different materials as the model box, holes are formed in the corresponding positions of the cover plate according to the size and the position of the downcomer, the cover plate is made of a material with a certain bearing capacity, and a load can be applied to the cover plate if necessary so as to improve the bearing capacity of the confined aquifer. The precipitation well pipe and the monitoring well pipe buried in the soil layer are made of materials which can be selected as required, for example, a pvc pipe and the like can be selected, the sizes of the PVC pipe and the PVC pipe are obtained by scaling down, the precipitation well pipe and the monitoring well pipe are punched at the lower half part, and nylon or gauze and the like are covered on the precipitation well pipe and the monitoring well pipe to simulate a filtering section of an actual well pipe. The scale on the inner wall of the model box, the glass tube attached to the inner wall, the monitoring well embedded in the soil layer, and the hose connecting the glass tube and the monitoring well form a water level observation meter, and the glass tube, the monitoring well and the hose form a communicating vessel, so that the water level change in the foundation pit can be observed more visually. The water supply pipes arranged around the model box can be made of different materials as required, the size of each water supply pipe is selected as required, and the corresponding part of each water supply pipe with the water-bearing soil layer is perforated and connected with a water-gas exchanger to serve as a water supply channel to simulate the confined water-bearing layer in the actual foundation pit. The water-air exchanger for providing water pressure is composed of control panel, stable air pressure source and water supply chamber. The water supply chamber consists of a water inlet pipe, a water outlet pipe, an exhaust hole, an air inlet and an isolating membrane. The inlet tube of the water supply chamber is connected with a water source (such as tap water, etc.), water enters the water supply chamber through the inlet tube, the pressure value is determined through the control panel, air is injected into the isolating membrane through the stable air pressure source, the isolating membrane is expanded, and pressure is applied to the water in the water supply chamber. The water outlet pipe of the water supply chamber is connected with a water supply pipe arranged on the periphery of the model box, and water from a water source provides pressure through a water-gas exchanger and enters the soil body of the model box through the water supply pipe to serve as a water pressure source.
The experimental method of the indoor simulation test device for confined water and precipitation of the foundation pit comprises the following steps:
a. assembling a model box: manufacturing a model box according to the required size, marking scales on the inner wall of the model box, fixing a water supply pipe on the inner wall of the model box, and forming holes on the pipe wall of the water supply pipe;
b. configuring a simulated soil layer: configuring a simulation soil layer according to the soil layer requirement of an actual engineering field, measuring the physicochemical property of the simulation soil layer through a soil test, and ensuring that the physicochemical property of the simulation soil layer is consistent with the actual soil layer during configuration in order to ensure the test accuracy;
c. laying a simulated soil layer: measuring the thickness of each soil layer according to the ground survey report of the actual engineering field, laying the soil layers in the model box, changing the soil layer distribution in the model box according to the soil layer distribution of different engineering, embedding the precipitation well pipe and the monitoring well pipe in the soil layers when laying the soil layers, and filling the filtering material and the plugging material around the well pipe;
d. assembling a water-gas exchanger: assembling each part in the water-gas exchanger, connecting a water inlet pipe with an external water source, and connecting a water outlet pipe with a water supply pipe;
e. water injection consolidation: opening an exhaust hole of a water supply chamber, filling water into the water supply chamber through a water inlet pipe, closing the exhaust hole after exhausting the air in the water supply chamber, connecting an air inlet hole with an air compressor, opening the air compressor, injecting air into the water supply chamber, providing pressure for the water in the water supply chamber through expansion of a hollow isolating membrane, controlling the water pressure condition through a control panel, injecting water into a model box when the required water pressure is reached, observing the water level in the model box through scales, stopping water supply when the water level of a monitoring well pipe is stable and water seepage on the surface of a simulated soil layer is generated, recording the water level of the monitoring well pipe, starting deadweight consolidation of a soil body, and meeting the test requirement when the settlement amount of the soil layer is less than 0.01mm/d for three consecutive days;
f. and (3) testing: the water pumping device is connected with a precipitation well pipe, the water inlet pipe is connected with the water-gas exchanger, the exhaust hole is opened, the water supply chamber is filled with water, the pressure value is set through the control panel, the water with pressure is injected into the model box through the water inlet pipe, the water pumping device is opened to extract the water in the soil layer, and the water level change condition in the soil is observed through the glass pipe. Other monitoring equipment can be buried in the soil layer to acquire corresponding monitoring data.
Further, an operation test is carried out before the test, and when the water level of the monitoring well pipe keeps the initial water level unchanged and a precipitation funnel can be observed in the glass pipe, the normal operation is indicated.
Has the advantages that: the utility model discloses a simulation soil layer accords with the real underground soil layer condition, can simulate the precipitation condition of confined aquifer, and water pressure is controllable, and can observe water pressure directly perceivedly, and water and soil layer contact, and the detection accuracy is higher. The utility model discloses the better interior simulation foundation ditch confined water precipitation process that is applicable to provides the reference for foundation ditch precipitation design parameter and construction, guarantees the accuracy and the security of foundation ditch excavation precipitation, provides reliable parameter for foundation ditch precipitation design.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of the water-gas exchanger of the present invention;
FIG. 3 is a schematic view of the structure of the water supply chamber of the present invention;
FIG. 4 is a schematic view of the dewatering well pipe structure of the present invention;
fig. 5 is a schematic view of the monitoring well pipe structure of the present invention;
FIG. 6 is a schematic structural view of the water level gauge of the present invention;
fig. 7 is a scale schematic diagram of the present invention.
Detailed Description
As shown in fig. 1, the structure of the indoor simulation test device for confined water and precipitation of foundation pit of the embodiment comprises two parts: the model box 1 is communicated with a water-gas exchanger 8 through a water supply pipe 7. The structure of the model box 1 is shown in figure 1, a simulated soil layer 2 is contained in the model box 1, and a water-bearing layer in the middle of the simulated soil layer 2 is a pressure water-bearing layer. A precipitation well pipe 4 and a monitoring well pipe 5 are arranged in a simulation soil layer 2, a cover plate 3 covers the simulation soil layer 2, the cover plate 3 is sleeved on the precipitation well pipe 4 and the monitoring well pipe 5, a water supply pipe 7 is arranged on the inner wall of a model box 1, the water supply pipe 7 extends out of the model box 1 and is communicated with a water-gas exchanger 8, a scale 61 (shown in figure 7) and a glass pipe 62 are further arranged on the inner wall of the model box 1, and the glass pipe 62 is communicated with the monitoring well pipe 5 through a hose 63. As shown in fig. 2, the water gas exchanger 8 is composed of a water supply chamber 81, a control panel 82, and a stable air pressure source 83. The structure of the mold box 1 in this embodiment is a rectangular parallelepiped.
As shown in fig. 4-5, the exterior structure of the precipitation well pipe 4 and the exterior structure of the monitoring well pipe 5 are basically the same, the precipitation well pipe 4 is perforated on the pipe wall as a first filter section 42, the exterior of the first filter section 42 is coated with a first filter material 43, a plugging material 41 is filled above the first filter material 43, and the upper part of the precipitation well pipe 4 is connected with a water pumping device 9. Similarly, the pipe wall of the monitoring well pipe 5 is provided with a hole as a second filter segment 52, the second filter segment 52 is externally coated with a second filter material 53, and the second filter material 53 is filled with a plugging material 51.
As shown in fig. 3, the water supply chamber 81 is composed of a water inlet pipe 811, an air inlet hole 812, an air outlet hole 815, a hollow isolating membrane 813, and a water outlet pipe 814, the water outlet pipe 814 is connected to the water supply pipe 7, and the water inlet pipe 811 is communicated with an external water source.
The experimental apparatus of this embodiment is manufactured and the experimental process is as follows:
(1) manufacturing a model box 1 according to the required size, wherein the size is 2m x 1.5m x 1m, the range of the marked scale 61 on the inner wall of the model box 1 is 0-70 cm, fixing water supply pipes 7 at four corners of the model box 1 respectively, and forming holes at corresponding positions of the water supply pipes 7;
(2) configuring a simulation soil layer 2 according to the soil layer requirements of an actual engineering field, measuring basic characteristics of the simulation soil layer 2 such as the heavy degree, the water content, the permeability coefficient and the like through a soil test, and ensuring that the characteristics of the simulation soil layer 2 are consistent with the actual soil layer during configuration in order to ensure the test accuracy;
(3) according to the actual engineering site survey report, the thickness of each soil layer is obtained by scaling down according to the proportion, the soil layers are laid in a model box 1, the upper layer is 15cm thick clay, the middle layer is 40cm thick silty clay, and the lower part is 15cm thick clay;
(4) assembling the water supply chamber 81, the control panel 82 and the stable air pressure source 83 in the water-gas exchanger 8, connecting tap water with the water inlet pipe 811 in the water supply chamber 81, filling the water supply chamber 81 with water through the water inlet pipe 811, exhausting the air in the water supply chamber, connecting the air compressor with the air inlet hole 812, setting the required pressure through the control panel 82, opening the stable air pressure source, filling air into the water supply chamber 81, providing pressure for the water in the water supply chamber 81 through the expansion of the hollow isolating membrane 813, controlling the water pressure condition through the control panel 82, and filling water into the model box 1 when the required water pressure is reached;
(5) observing the water level in the model box 1 through a water level observation meter (shown in figure 6), stopping water supply when the water level of the monitoring well pipe 5 meets the requirement and keeps stable, recording the water level of the observation well, then starting deadweight consolidation of soil, and considering that the test requirement is met when the settlement amount of the soil layer is less than 0.01mm/d for three consecutive days;
(6) and (3) running and testing: when the water level of the monitoring well pipe 5 keeps unchanged at the initial water level and a precipitation funnel can be observed in the glass pipe 62, the normal operation is indicated, and then a formal test can be carried out;
(7) and (3) testing: the water pumping device 9 is connected with the precipitation well pipe 4, the water inlet pipe 811 is connected with the water-gas exchanger 8, the exhaust hole 815 is opened, the water supply chamber 81 is filled with water, the pressure value is set through the control panel 82, the water with pressure is injected into the model box 1 through the water inlet pipe 811, the water pumping device 9 is opened to pump the water in the soil layer, and the water level change condition in the soil is observed through the glass pipe 62.
Claims (7)
1. The utility model provides a foundation ditch confined water precipitation indoor simulation test device which characterized in that: comprises a model box (1) and a water-gas exchanger (8), the model box (1) is communicated with the water-gas exchanger (8) through a water supply pipe (7),
model case (1) is inside to hold simulation soil layer (2), sets up precipitation well pipe (4) and monitoring well pipe (5) in simulation soil layer (2), covers apron (3) on simulation soil layer (2), and apron (3) cover is established on precipitation well pipe (4) and monitoring well pipe (5), and delivery pipe (7) are laid to model case (1) inner wall, and delivery pipe (7) stretch out model case (1) and communicate with aqueous vapor exchange appearance (8), and model case (1) inner wall still sets up scale (61) and glass pipe (62), glass pipe (62) are through hose (63) and monitoring well pipe (5) intercommunication.
2. The indoor simulation test device of foundation pit confined water precipitation of claim 1, characterized in that: and the aquifer in the middle of the simulated soil layer (2) is a confined water layer.
3. The indoor simulation test device of foundation pit confined water precipitation of claim 1, characterized in that: the pipe wall of the precipitation well pipe (4) is provided with holes serving as a first filtering section (42), a first filtering material (43) is coated outside the first filtering section (42), a plugging material (41) is filled above the first filtering material (43), and the upper part of the precipitation well pipe (4) is connected with a water pumping device (9).
4. The indoor simulation test device of foundation pit confined water precipitation of claim 1, characterized in that: holes are arranged on the pipe wall of the monitoring well pipe (5) and used as a second filtering section (52), a second filtering material (53) is coated outside the second filtering section (52), and a plugging material (51) is filled above the second filtering material (53).
5. The indoor simulation test device of foundation pit confined water precipitation of claim 1, characterized in that: the water-gas exchanger (8) is composed of a water supply chamber (81), a control panel (82) and a stable air pressure source (83).
6. The foundation pit confined water precipitation indoor simulation test device of claim 5, characterized in that: the water supply chamber (81) is composed of a water inlet pipe (811), an air inlet hole (812), an air exhaust hole (815), a hollow isolating membrane (813) and a water outlet pipe (814), the water outlet pipe (814) is connected with a water supply pipe (7), and the water inlet pipe (811) is communicated with an external water source.
7. The indoor simulation test device of foundation pit confined water precipitation of claim 1, characterized in that: the model box (1) is a cuboid or a cylinder.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109853646A (en) * | 2019-04-02 | 2019-06-07 | 江苏省地质矿产局第三地质大队 | Indoor simulation test device and method for confined water precipitation of foundation pit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109853646A (en) * | 2019-04-02 | 2019-06-07 | 江苏省地质矿产局第三地质大队 | Indoor simulation test device and method for confined water precipitation of foundation pit |
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Granted publication date: 20200211 Termination date: 20210402 |