CN209296530U - A kind of suspension type water-stop curtain flow model in porous media pilot system - Google Patents

Abstract

The utility model discloses a suspended water-stop curtain seepage model test system, comprising: a soil box, a soil box main body, an upper water tank, a water circulation system, a water pressure monitoring system, a settlement monitoring system, a water inlet transition plate, a curtain baffle plate and a flow rate Plan, foundation pit. The suspended water-stop curtain seepage model test system of the utility model simulates the distribution of the seepage field of the foundation pit engineering under the suspended water-stop curtain in actual engineering by changing different curtain insertion depths. The device can accurately simulate the actual working conditions, and can also change the shape of the foundation pit to study the characteristics of the seepage field under different shapes of the foundation pit.

Description

A suspended water-stop curtain seepage model test system

technical field

The invention belongs to the technical field of groundwater seepage control, in particular to a model test system suitable for studying seepage of foundation pits under water cut-off or precipitation conditions.

Background technique

Groundwater seepage control is an important safety control technology in foundation pit engineering. At present, there is little analysis on the seepage of foundation pits under suspended water-stop curtains in the current codes. The size of the existing seepage model test systems for suspended water-stop curtains is relatively small, and the influence of influence radius on seepage is not fully considered. And their head measurement device has a large error in the measurement process. After considering the radius of influence and improving the measuring device, the present invention designs a set of brand-new suspended water-stop curtain seepage model test system, which can be more accurately used for basic theoretical research on seepage or verification of numerical calculation results.

Contents of the invention

In order to overcome the deficiencies of the prior art above, the present invention provides a suspended water-stop curtain seepage model test system, which aims to obtain the seepage field distribution in the foundation pit and the The change law of settlement outside the pit.

In order to meet the above-mentioned needs, the technical scheme adopted in the present invention is:

A suspended water-stop curtain seepage model test system, including: soil box, soil box main body, upper water tank, water circulation system, water pressure monitoring system, settlement monitoring system, water inlet transition plate, curtain baffle, flow meter, foundation pit ;in,

Each surface of the soil box is a plexiglass plate. The interior of the soil box is provided with a curtain baffle and a water inlet transition plate from left to right, and the interior of the soil box is divided from left to right into the foundation pit, the main body of the soil box and the upper water tank. The main body of the soil box There are a number of second through holes on the front, and sand is contained in the main body of the soil box; the upper water tank has no upper cover, and the first through hole is arranged on the right side of the upper water tank, and the first through hole is blocked by a piston; the left side of the foundation pit is set There are multiple downstream water outlets; the main body of the soil box and the upper water tank are separated by a water inlet transition plate, and a third through hole is provided on the water inlet transition plate, and the water inlet transition plate is fixed by the first baffle bracket The first baffle brackets slide vertically; the main body of the soil box and the foundation pit are separated by a curtain baffle, and the curtain baffle is fixed by the second baffle bracket and can slide vertically between the second baffle brackets;

The water circulation system consists of a self-priming water pump and a water tank. One end of the self-priming water pump is connected to one end of the water tank. The other end of the self-priming water pump is inserted into the upper water tank through a water pipe. A three-way pipe fitting, the three-way pipe fitting is inserted into the foundation pit through the downstream water outlet, and the water at the downstream water outlet is pumped back to the upper water tank through the water tank.

The water pressure monitoring system consists of multiple liquid level gauges and multiple pore water pressure gauges. The liquid level gauges are arranged on the outside of the lower part of the earth tank and placed every 10cm. The liquid level gauges pass through the second through hole and the The dewatering well pipes in the main body of the soil box are connected; the pore water pressure gauges are embedded in the sand of the main body of the soil box, and are located on the right side of the curtain baffle, and are placed every 20cm from bottom to top.

The settlement monitoring system consists of a plurality of displacement micrometers, which are located on the sandy soil surface of the main body of the soil box, arranged along the longitudinal direction, and placed one every 20cm.

Preferably, the water inlet transition plate and the curtain baffle are two aluminum plates plus a built-in frame.

The beneficial effects of the present invention are: the suspended water-stop curtain seepage model test system of the present invention can observe the flow rate of the water outlet when the seepage in the soil box reaches a stable state, and obtain the test value of the water inflow of the foundation pit under different insertion depths of the curtain plate; By observing the water level outside the foundation pit, the test value of the influence radius of the foundation pit dewatering can be obtained; at the same time, the test value of the settlement outside the pit caused by the dewatering of the foundation pit can be obtained by observing the ground settlement outside the foundation pit.

Description of drawings

Fig. 1 is the front view of the suspended water-stop curtain seepage model test system;

In the figure: 1-main body of soil box; 2-upper water tank; 3-water circulation system; 4-pore water pressure; 5-displacement micrometer; 6-inlet transition plate; 7-curtain baffle; 8-flow meter; 9-foundation pit; 10-soil box; 11-second through hole; 12-self-priming pump; 13-water tank.

Detailed ways

The suspended water-stop curtain seepage model test system can simulate the actual working conditions and obtain the seepage flow network shape consistent with the actual project, which is used to study the characteristics and laws of the groundwater seepage field. The experimental results can guide the actual engineering design, and at the same time, they can be used to correct the groundwater inflow, the water level outside the pit, and the calculation of settlement caused by precipitation in the foundation pit regulations.

As shown in Figure 1, the present invention provides a suspended water-stop curtain seepage model test system, including: soil box, soil box main body, upper water tank, water circulation system, water pressure monitoring system, settlement monitoring system, water inlet transition plate, Curtain baffle, flow meter, foundation pit; among them,

Each surface of the soil box is a plexiglass plate. The interior of the soil box is provided with a curtain baffle and a water inlet transition plate from left to right, and the interior of the soil box is divided from left to right into the foundation pit, the main body of the soil box and the upper water tank. The main body of the soil box There are a number of second through holes on the front, and sand is contained in the main body of the soil box; the upper water tank has no upper cover, and the first through hole is arranged on the right side of the upper water tank, and the first through hole is blocked by a piston; the left side of the foundation pit is set There are multiple downstream water outlets; the main body of the soil box and the upper water tank are separated by a water inlet transition plate, and a third through hole is provided on the water inlet transition plate, and the water inlet transition plate is fixed by the first baffle bracket The first baffle brackets slide vertically; the main body of the soil box and the foundation pit are separated by a curtain baffle, and the curtain baffle is fixed by the second baffle bracket and can slide vertically between the second baffle brackets;

The water circulation system consists of a self-priming water pump and a water tank. One end of the self-priming water pump is connected to one end of the water tank. The other end of the self-priming water pump is inserted into the upper water tank through a water pipe. A three-way pipe fitting, the three-way pipe fitting is inserted into the foundation pit through the downstream water outlet, and the water at the downstream water outlet is pumped back to the upper water tank through the water tank.

The water pressure monitoring system consists of multiple liquid level gauges and multiple pore water pressure gauges. The liquid level gauges are arranged on the outside of the lower part of the earth tank and placed every 10cm. The liquid level gauges pass through the second through hole and the The dewatering well pipes in the main body of the soil box are connected; the pore water pressure gauges are embedded in the sand of the main body of the soil box, and are located on the right side of the curtain baffle, and are placed every 20cm from bottom to top.

The settlement monitoring system consists of a plurality of displacement micrometers, which are located on the sandy soil surface of the main body of the soil box, arranged along the longitudinal direction, and placed one every 20cm.

The water inlet transition plate and the curtain baffle are two aluminum plates with a built-in frame.

The suspended water-stop curtain seepage model test system of the present invention can observe the flow rate of the water outlet when the seepage in the soil box reaches a stable state, and obtain the test value of the water inflow of the foundation pit under different insertion depths of the curtain plate; The water level is used to obtain the test value of the radius of influence of the foundation pit precipitation. By observing the ground settlement outside the foundation pit, the test value of the settlement outside the pit caused by the dewatering of the foundation pit can be obtained.

The invention utilizes the suspended water-stop curtain seepage model test system to simulate the distribution of the seepage field of the foundation pit engineering under the suspended water-stop curtain in actual engineering by changing different curtain insertion depths. The system can accurately simulate the actual working conditions, and can also change the shape of the foundation pit to study the characteristics of the seepage field under different shapes of the foundation pit.

Claims (2)

1. The utility model provides a suspension type stagnant water curtain seepage flow model test system which characterized in that includes: the soil box comprises a soil box body, an upper water tank, a water circulation system, a water pressure monitoring system, a settlement monitoring system, a water inlet transition plate, a curtain baffle, a flowmeter and a foundation pit; wherein,

each surface of the soil box is provided with an organic glass plate, a curtain baffle and a water inlet transition plate are arranged in the soil box from left to right, the interior of the soil box is divided into a foundation pit, a soil box main body and a water feeding tank from left to right, a plurality of second through holes are formed in the front of the soil box main body, and sandy soil is contained in the soil box main body; the upper water tank is not provided with an upper cover, the right side of the upper water tank is provided with a first through hole, and a piston is adopted to block the first through hole; a plurality of downstream water outlets are formed in the left side of the foundation pit; the soil box main body and the upper water tank are separated by a water inlet transition plate, the water inlet transition plate is provided with a third through hole, and the water inlet transition plate is fixed by the first baffle plate bracket and can vertically slide between the first baffle plate brackets; the soil box main body and the foundation pit are separated by a curtain baffle, and the curtain baffle is fixed by a second baffle bracket and can vertically slide between the second baffle brackets;

the water circulation system consists of a self-priming water pump and a water tank, wherein one end of the self-priming water pump is connected with one end of the water tank, the other end of the self-priming water pump is inserted into the upper water tank through a water pipe, the other end of the water tank is connected with one end of a flow meter, the other end of the flow meter is connected with a tee pipe fitting, the tee pipe fitting is inserted into the foundation pit through a downstream water outlet, and water at the downstream water outlet is pumped back to the upper;

the water pressure monitoring system consists of a plurality of liquid level meters and a plurality of pore water pressure meters, the liquid level meters are distributed on the outer side of the lower part of the soil box main body and are arranged at intervals of 10cm, and the liquid level meters penetrate through the second through holes through the pagoda joints of the water box and are connected with precipitation well pipes in the soil box main body; the pore water pressure gauge is embedded in the sandy soil of the soil box main body, is positioned on the right side of the curtain baffle and is arranged every 20cm from bottom to top;

the settlement monitoring system consists of a plurality of displacement micrometers, and the displacement micrometers are positioned on the sandy soil surface of the soil box main body and are longitudinally arranged one by one at intervals of 20 cm.

2. The suspended water-stop curtain seepage model test system as claimed in claim 1, wherein the water inlet transition plate and the curtain baffle are two aluminum plates with a built-in framework.