A desaturation treatment system and construction method for liquefiable soil around a train tunnel

Abstract

The present invention discloses a system and construction method for desaturating liquefiable soil surrounding a train tunnel. The system comprises a tunnel and a train. The tunnel includes an electrolysis section and a non-electrolysis section, which are arranged at intervals. A passive coil is embedded in the electrolysis section, with electrodes provided at both ends of the passive coil and a monitor mounted on the passive coil, which is connected to a control system. The train comprises several carriages, with carriage connections between adjacent carriages, and active coils are installed at the outermost sides of the carriage connections. The system can desaturate soil surrounding the tunnel without disturbing the soil, significantly improving the soil's resistance to liquefaction. The system includes a system for real-time monitoring and adjustment of soil saturation, capable of promptly transmitting soil status to the subway control system. When the soil is in good condition, power consumption can be reduced, and when the soil is in poor condition, desaturation treatment can be performed promptly.

Description

Technical Field

[0001] The present invention relates to a desaturation system and construction method for soil mass around a tunnel, and in particular to a desaturation treatment system and construction method for liquefiable soil mass around a train tunnel. Background Art

[0002] Foundation soil liquefaction occurs when saturated sandy silt soil, when disturbed by cyclic loading, has insufficient time for internal pore water to drain. This leads to increased pore water pressure, a decrease or loss of effective stress, and near-zero shear strength. The soil loses its bearing capacity and begins to flow like a "liquid." Due to its hollow interior, tunnel structures may have an overall density lower than the soil. When this soil liquefies, the tunnel may float and fail. Therefore, improving the liquefaction resistance of the soil surrounding the tunnel is crucial for engineering projects.

[0003] Patent No. 202221590459.8 uses anti-floating anchor rods with electrolysis function to desaturate the tunnel. As can be seen from the above-mentioned related equipment, existing tunnel desaturation devices often require disturbing the soil around the tunnel during installation or construction, which increases the workload of the project. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a desaturation treatment system and construction method for liquefiable soil around a train tunnel, which can desaturate the soil around the tunnel without disturbing the soil, significantly improve the soil's anti-liquefaction strength, and avoid damage such as tunnel floating.

[0005] Technical solution: The present invention includes a tunnel and a train, wherein the tunnel includes an electrolysis section tunnel and a non-electrolysis section tunnel, and the electrolysis section tunnel and the non-electrolysis section tunnel are arranged at intervals, wherein a passive coil is embedded in the electrolysis section tunnel, and electrodes are provided at both ends of the passive coil. A monitor is installed on the passive coil, and the monitor is connected to a control system; the train includes several carriages, and a carriage connection is provided between adjacent carriages, and an active coil is provided on the outermost side of the carriage connection.

[0006] The monitor includes an ammeter and a voltmeter, both of which are connected to a control system. The control system determines the degree of desaturation required by resistivity and adjusts the magnetic field of subsequent trains to reduce energy consumption.

[0007] The ammeter and voltmeter are used to record the coil current and the voltage at both ends of the electrode respectively.

[0008] The electrodes at both ends of the passive coil have opposite polarities, and the electrodes on the sides close to each other in adjacent passive coils have opposite polarities, so as to achieve desaturation of the soil around the tunnel.

[0009] The carriage connection is provided with an active coil, a metal shielding layer and a protective layer in sequence from the outside to the inside.

[0010] The glass parts of the windows and doors on the carriage are made of a metal grid method and have the function of shielding the magnetic field.

[0011] The vehicle windows, vehicle doors and metal shielding layer form electromagnetic shielding, reducing the impact of electromagnetic radiation on the human body.

[0012] The bottom of the tunnel is a track cushion layer, the top of the track cushion layer is a track, and the carriage travels on the track.

[0013] A desaturation process of a liquefiable soil desaturation treatment system for a train tunnel periphery includes the following steps:

[0014] Step 1: When the i-th car of the train passes through the tunnel, a detection current is applied to the active coil, and an induced electromotive force is generated by the passive coil. The ammeter and voltmeter detect the corresponding data and transmit them to the control system.

[0015] Step 2: The control system determines whether the foundation soil needs to be desaturated based on the data received from the ammeter and voltmeter and the relationship between the foundation soil saturation and the foundation equivalent resistance;

[0016] Step 3: If it is determined that desaturation treatment is not necessary, the active coil of the i+1th car continues to be supplied with the detection current; if it is determined that desaturation treatment is required, the control system calculates according to the obtained foundation saturation and transmits the calculated required current information to the i+1th car. Then, the active coil of the i+1th car is supplied with the desaturation current, the passive coil generates an induced current to desaturate the soil, and the data of the transmission ammeter and voltmeter are transmitted to the control system;

[0017] Step 4: The control system determines whether the next car needs to be desaturated based on the data sent back by the ammeter and voltmeter when the i+1th car passes, that is, repeating steps 2 and 3.

[0018] Beneficial effects: The present invention adopts an integrated construction of tunnel-electrolysis system, which can be installed together during the installation process of the tunnel shield, avoiding secondary excavation of the electrolysis system during installation, facilitating construction and simple operation. It can desaturate the soil outside the tunnel without disturbing the soil, and can significantly improve the soil's anti-liquefaction strength; it has an adjustable induced current, which can control the soil desaturation rate; the conductive whole formed by connecting the various parts of the car can reduce the impact of electromagnetic radiation on the human body; it has a system for real-time monitoring and adjustment of soil saturation, which can promptly transmit the soil status to the subway control system. When the soil is in good condition, the power consumption can be reduced, and when the soil is in poor condition, desaturation treatment can be carried out in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the tunnel of the present invention;

[0021] Figure 3 The coil and electrode arrangement diagram in the tunnel of the present invention;

[0022] Figure 4 It is a schematic diagram of a carriage of the present invention;

[0023] Figure 5 It is a schematic diagram of the carriage connection of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figures 1 to 5 As shown, the present invention includes a tunnel and a train, wherein an electrolysis section tunnel 1 and a non-electrolysis section tunnel are provided in the tunnel, and the electrolysis section tunnel and the non-electrolysis section tunnel are arranged at intervals. A passive coil 2 is embedded in the electrolysis section tunnel 1, and electrodes 3 are provided at both ends of the passive coil 2. An ammeter 4 and a voltmeter 5 are installed on the passive coil 2. Figure 2 and Figure 3 As shown, ammeter 4 and voltmeter 5 respectively record the coil current and the voltage across electrode 3 in real time, and transmit them to the train control system. The control system determines the degree of desaturation required based on resistivity and adjusts the magnetic field for subsequent trains, thereby reducing energy consumption. The electrodes 3 at both ends of the same passive coil 2 have opposite polarity, and the electrodes 3 on the sides of adjacent passive coils 2 that are closer to each other have opposite polarity, to achieve desaturation of the soil surrounding the tunnel.

[0026] like Figure 4 As shown, the bottom of the tunnel is a track cushion 6, and the top of the track cushion 6 is a track 7. The train travels on the track 7. The train includes several carriages 8. The glass parts of the glass windows 9 and glass doors 10 on the carriages 8 are made of metal mesh method, which has the function of shielding magnetic field. There is a carriage connection 11 between every two carriages 8. Figure 5As shown, the carriage connection 11 is provided with an active coil 12, a metal shielding layer 13, and a protective layer 14 from the outside to the inside. The glass window 9, the glass door 10, and the metal shielding layer 13 can form a Faraday cage to provide electromagnetic shielding, thereby reducing the impact of electromagnetic radiation on the human body. By energizing the active coil 12 to form a magnetic field, the magnetic flux in the passive coil 2 changes during the operation of the train, generating an induced electromotive force at both ends of the electrode 3, and transmitting it to the control system through the ammeter and voltmeter. The control system determines the degree of desaturation required by the resistivity and adjusts the magnetic field of the subsequent train. At the same time, by adjusting the current of the active coil 12, magnetic fields of different intensities can be formed, causing the passive coil 2 to generate corresponding electrolytic electromotive force.

[0027] The present invention has the function of adjusting soil saturation. By monitoring the soil saturation in real time, the control system determines whether desaturation work is needed. If the soil is in good condition, a detection current with low energy consumption is passed through the active coil 12 to reduce power consumption; if the soil reaches a state where desaturation is required, the control system can send corresponding desaturation current data to the train, and the train power distribution system will energize the active coil 12 to generate an induced electromotive force in the passive coil 2 to desaturate and achieve saturation adjustment.

[0028] The desaturation process of the present invention comprises the following steps:

[0029] Step 1: When the i-th carriage of the train passes through the tunnel, a detection current is applied to the active coil 12, and the passive coil 2 generates an induced electromotive force. The ammeter 4 and voltmeter 5 detect the corresponding data and transmit them to the control system;

[0030] Step 2: The control system determines whether the foundation soil needs to be desaturated based on the data received from the ammeter 4 and the voltmeter 5 and the relationship between the foundation soil saturation and the foundation equivalent resistance;

[0031] Step 3: If it is determined that desaturation treatment is not necessary, the active coil 12 of the (i+1)th car continues to be supplied with the detection current; if it is determined that desaturation treatment is required, the control system calculates the required current information based on the obtained foundation saturation and transmits the calculated required current information to the (i+1)th car. Then, the active coil 12 of the (i+1)th car is supplied with the desaturation current, the passive coil 2 generates an induced current to desaturate the soil, and the data of the transmission ammeter 4 and the voltmeter 5 are transmitted to the control system;

[0032] Step 4: The control system determines whether the next car needs to be desaturated based on the data sent back by the ammeter 4 and the voltmeter 5 when the i+1th car passes, that is, repeats steps 2 and 3 to keep the soil saturation around the train within a certain range.

Claims

1. A desaturation treatment system for liquefiable soil around a train tunnel, characterized in that: The invention comprises a tunnel and a train, wherein the tunnel comprises an electrolysis section tunnel and a non-electrolysis section tunnel, and the electrolysis section tunnel and the non-electrolysis section tunnel are arranged at intervals, wherein a passive coil is embedded in the electrolysis section tunnel, electrodes are provided at both ends of the passive coil, a monitor is installed on the passive coil, and the monitor is connected to a control system; the train comprises a plurality of carriages, a carriage connection is provided between adjacent carriages, and an active coil is provided on the outermost side of the carriage connection.

2. A desaturation treatment system for liquefiable soil around a train tunnel according to claim 1, characterized in that: The monitor includes an ammeter and a voltmeter, and both the ammeter and the voltmeter are connected to a control system.

3. The desaturation treatment system for liquefiable soil around a train tunnel according to claim 2, characterized in that: The ammeter and voltmeter are used to record the coil current and the voltage at both ends of the electrode respectively.

4. The desaturation treatment system for liquefiable soil around a train tunnel according to claim 1, characterized in that: The electrodes at both ends of the passive coil have opposite polarities, and the electrodes on the sides close to each other in adjacent passive coils have opposite polarities.

5. The desaturation treatment system for liquefiable soil around a train tunnel according to claim 1, characterized in that: The carriage connection is provided with an active coil, a metal shielding layer and a protective layer in sequence from the outside to the inside.

6. The desaturation treatment system for liquefiable soil around a train tunnel according to claim 5, characterized in that: The glass parts of the windows and doors on the carriage are made by a metal grid method.

7. The desaturation treatment system for liquefiable soil around a train tunnel according to claim 6, characterized in that: The vehicle windows, vehicle doors and metal shielding layer form an electromagnetic shield.

8. The desaturation treatment system for liquefiable soil around a train tunnel according to claim 1, characterized in that: The bottom of the tunnel is a track cushion layer, and the top of the track cushion layer is a track.

9. A construction method for a desaturation treatment system for liquefiable soil mass surrounding a train tunnel according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: When the i-th car of the train passes through the tunnel, a detection current is applied to the active coil, and an induced electromotive force is generated by the passive coil. The ammeter and voltmeter detect the corresponding data and transmit them to the control system. Step 2: The control system determines whether the foundation soil needs to be desaturated based on the data received from the ammeter and voltmeter and the relationship between the foundation soil saturation and the foundation equivalent resistance; Step 3: If it is determined that desaturation treatment is not necessary, the active coil of the i+1th car continues to be supplied with the detection current; if it is determined that desaturation treatment is required, the control system calculates according to the obtained foundation saturation and transmits the calculated required current information to the i+1th car. Then, the active coil of the i+1th car is supplied with the desaturation current, the passive coil generates an induced current to desaturate the soil, and the data of the transmission ammeter and voltmeter are transmitted to the control system; Step 4: The control system determines whether the next car needs to be desaturated based on the data sent back by the ammeter and voltmeter when the i+1th car passes, that is, repeating steps 2 and 3.

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