CN110792453A - Shield tunnel segment, monitoring system and monitoring method - Google Patents

Abstract

The present disclosure provides a shield tunnel segment, a monitoring system and a monitoring method. Among them, a shield tunnel segment includes a segment body, which is in the shape of an eighth circular arc; cubes are provided at opposite positions on both sides of the segment body, and the cubes are embedded with osmotic pipes, and the A osmotic pressure sensor is arranged in the osmotic pressure pipe, and the osmotic pressure sensor is used to monitor the seepage pressure in real time; the integrated gas sensor is also embedded in the cube, and the integrated gas sensor is used to monitor the type and concentration of harmful gases in the tunnel in real time; Displacement sensors are embedded, and the displacement sensors are used to monitor the displacement and deformation of the tunnel in real time; water barriers are provided at 1/3 of the inner wall and 1/3 of the outer wall of the segment body; sealing layers are provided on the edges of the segment body.

Description

A shield tunnel segment, monitoring system and monitoring method

technical field

The disclosure belongs to the technical field of tunnel construction monitoring, and in particular relates to a shield tunnel segment, a monitoring system and a monitoring method.

Background technique

The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

Segment is the "soul" of shield construction. As the permanent lining structure of the tunnel, the success of the segment design is directly related to the quality and life of the shield tunnel. The self-impermeability performance of segments and the tightness between segments are the most critical factors for preventing leakage of tunnels and controlling the concentration of harmful gases entering the tunnel. At the same time, the stability of the surrounding rock of the tunnel is directly related to the safe operation of the tunnel.

At present, the cross-section of urban underground shield tunnels in my country is mostly circular, and the single-layer reinforced concrete segment is one of the most widely used lining structures of shield tunnels. With the further construction of subways in various regions, in the face of increasingly complex underground engineering construction environment, the inventor found that, especially in the development areas of water-rich and gas-rich strata, there is still no targeted application of segments.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present disclosure provides a shield tunnel segment, a monitoring system and a monitoring method, which can be applied to a variety of complex geological conditions, perform real-time monitoring and early warning of the tunnel, and can achieve the purpose of disaster precursor warning and risk management and control. .

In order to achieve the above object, the present disclosure adopts the following technical solutions:

A first aspect of the present disclosure provides a shield tunnel segment comprising:

The main body of the segment, which is in the shape of an eighth arc;

Cubes are arranged at opposite positions on both sides of the main body of the segment, and a osmotic pressure pipe is embedded in the cubes. A osmotic pressure sensor is arranged in the osmotic pressure pipe, and the osmotic pressure sensor is used to monitor the seepage pressure of the tunnel in real time; There is also an integrated gas sensor buried in it, and the integrated gas sensor is used to monitor the type and concentration of harmful gases in the tunnel in real time;

Displacement sensors are embedded in the segment body, and the displacement sensors are used to monitor the displacement and deformation of the tunnel in real time; water barriers are arranged at 1/3 of the inner wall and 1/3 of the outer wall of the segment body; the edges of the segment body are provided with seals Floor.

A second aspect of the present disclosure provides a tunnel monitoring system, comprising:

Repeaters and several shield tunnel segments as described above are arranged at intervals in the tunnel, and these shield tunnel segments wrap the entire tunnel section;

The seepage pressure sensor, the integrated gas sensor and the displacement sensor in the shield tunnel segment are connected to the repeater; the repeater is used to receive the tunnel seepage pressure, the tunnel water pressure and the tunnel pressure respectively uploaded by the seepage pressure sensor, the integrated gas sensor and the displacement sensor. The type and concentration of harmful gases in the interior and the displacement and deformation of the tunnel are compared with the corresponding safety threshold to determine whether to alarm.

A third aspect of the present disclosure provides a tunnel monitoring method, which includes:

Divide the tunnel into several sections, each section is provided with a repeater and several shield tunnel segments, these shield tunnel segments wrap the entire tunnel section;

Receive the seepage pressure of the tunnel, the type and concentration of harmful gases in the tunnel, and the displacement and deformation of the tunnel uploaded by the seepage pressure sensor, the integrated gas sensor, and the displacement sensor, respectively, and compare them with the corresponding safety thresholds to determine whether to alarm.

The beneficial effects of the present disclosure are:

(1) The shield tunnel segment of the present disclosure can be applied to a variety of complex geological conditions, and can monitor the seepage pressure of the tunnel, the type and concentration of harmful gases in the tunnel, and the tunnel displacement deformer in real time. The edge of the main body of the segment is provided with a sealing layer, which has excellent impermeability and improves the working stability of the shield tunnel tube.

(2) The tunnel monitoring system and monitoring method of the present disclosure, by receiving the tunnel water seepage pressure, the type and concentration of harmful gases in the tunnel, and the tunnel displacement deformation uploaded by the seepage pressure sensor, the integrated gas sensor and the displacement sensor, respectively, and the corresponding safety threshold value By comparing, judging whether to alarm, realizing disaster precursor warning and risk management and control, and ensuring the stability of the tunnel.

Description of drawings

The accompanying drawings that constitute a part of the present disclosure are used to provide further understanding of the present disclosure, and the exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure.

1 is a schematic diagram of a shield tunnel segment according to an embodiment of the present disclosure;

2 is a side view of a shield tunnel segment of an embodiment of the present disclosure;

3 is a top view of a shield tunnel segment according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a splicing manner of two adjacent shield tunnel segments in an embodiment of the present disclosure.

Among them, 1. segment body, 2. cube block, 3. water barrier layer, 4. sealing layer, 5. bolt.

Detailed ways

The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

In this disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only a relational word determined for the convenience of describing the structural relationship of each component or element of the present disclosure, and does not specifically refer to any component or element in the present disclosure, and should not be construed as a reference to the present disclosure. public restrictions.

In the present disclosure, terms such as "fixed connection", "connected", "connected", etc. should be understood in a broad sense, indicating that it may be a fixed connection, an integral connection or a detachable connection; it may be directly connected, or through an intermediate connection. media are indirectly connected. For the relevant scientific research or technical personnel in the field, the specific meanings of the above terms in the present disclosure can be determined according to specific situations, and should not be construed as limitations on the present disclosure.

Example 1

The shield tunnel segment of this embodiment includes:

The segment body 1 is in the shape of an eighth circular arc, as shown in Figure 1;

Cubes 2 are arranged at opposite positions on both sides of the segment body 1. The cubes are embedded with osmotic pressure pipes, and osmotic pressure sensors are arranged in the osmotic pressure pipes. The osmotic pressure sensors are used to monitor the seepage pressure of the tunnel in real time; the An integrated gas sensor is also embedded in the cube, and the integrated gas sensor is used to monitor the type and concentration of harmful gases in the tunnel in real time;

A displacement sensor is embedded in the main body of the segment, and the displacement sensor is used to monitor the displacement and deformation of the tunnel in real time; a water barrier 3 is arranged at 1/3 of the inner wall and 1/3 of the outer wall of the main body of the segment, as shown in Figure 2; The edges of the sheet main body 1 are provided with sealing layers 4 , as shown in FIG. 3 .

In a specific implementation, the main body of the segment is composed of a plastic concrete cast steel skeleton, which achieves strength and satisfies cooperative deformation.

The advantages of the above technical solutions are that the plastic concrete has low elastic modulus, large ultimate strain, affinity with the soft surrounding rock, the strength increases linearly with the confining pressure, and at the same time has excellent impermeability, the use of plastic concrete to cast the steel skeleton greatly improves the tunnel. security.

In a specific implementation, the water barrier is made of polypropylene fiber material.

Among them, polyethylene fiber is a flexible waterproof gas barrier material with stable chemical properties, strong anti-aging ability, and good heat resistance and cold resistance. The water barrier layer in this embodiment is made of polypropylene fiber material, which satisfies The synergistic small deformation of the segment greatly enhances the compactness of the tunnel segment, improves the anti-seepage water and gas-proof performance of the tunnel space, and greatly improves the safety protection level of the tunnel.

In a specific implementation, the sealing layer is a polyvinyl chloride tie tape with a high degree of polymerization.

Among them, high polymerization degree polychlorine has the advantages of high strength, high toughness, compression resistance, good flame retardancy, and corrosion resistance. The use of high-polymerization polyvinyl chloride at the joints of the segments can further improve the safety and airtightness of the tunnel and control the spread of large-scale disasters.

In a specific implementation, the integrated gas sensor consists of an electrochemical carbon monoxide sensor, an electrochemical hydrogen sulfide sensor, an electrochemical sulfur dioxide sensor, and an optical interference methane sensor, which are used to monitor carbon monoxide, hydrogen sulfide, sulfur dioxide, and methane and their corresponding concentrations, respectively.

As shown in FIG. 4 , any two adjacent shield tunnel segments are fixedly connected by bolts 5 .

It should be noted that other fixing methods may also be used in the art to fix and connect any two adjacent shield tunnel segments.

The shield tunnel segment of this embodiment can be applied to a variety of complex geological conditions, and can monitor the seepage pressure of the tunnel, the type and concentration of harmful gases in the tunnel, and the tunnel displacement deformer in real time. The edge of the main body of the segment is provided with a sealing layer, which has excellent impermeability and improves the working stability of the shield tunnel tube.

Example 2

The tunnel monitoring system of this embodiment includes:

Repeaters and several shield tunnel segments as described in Embodiment 1 are arranged at intervals in the tunnel, and these shield tunnel segments wrap the entire tunnel section;

The seepage pressure sensor, the integrated gas sensor and the displacement sensor in the shield tunnel segment are connected to the repeater; the repeater is used to receive the tunnel seepage pressure, the tunnel water pressure and the tunnel pressure respectively uploaded by the seepage pressure sensor, the integrated gas sensor and the displacement sensor. The type and concentration of harmful gases in the interior and the displacement and deformation of the tunnel are compared with the corresponding safety threshold to determine whether to alarm.

In a specific implementation, any two adjacent shield tunnel segments are connected by bolts.

It should be noted that other fixing methods may also be used in the art to fix and connect any two adjacent shield tunnel segments.

For example: when the tunnel seepage pressure is greater than or equal to the tunnel seepage pressure safety threshold, output the tunnel seepage alarm information;

When the concentration of any harmful gas in the tunnel is greater than or equal to the safe concentration threshold, output tunnel harmful gas alarm information; wherein, harmful gases include but are not limited to carbon monoxide, hydrogen sulfide, sulfur dioxide, methane and other gases;

When the tunnel displacement deformation is greater than or equal to the tunnel displacement safety threshold, the tunnel displacement and deformation alarm information is output.

Among them, the safety threshold of tunnel water seepage pressure, safety concentration threshold and tunnel displacement safety threshold are all known values.

As a specific implementation manner, the repeater is also connected with an alarm device.

Wherein, the alarm device includes but is not limited to an early warning bell and a warning light.

In this embodiment, the water seepage pressure of the tunnel, the type and concentration of harmful gases in the tunnel, and the displacement and deformation of the tunnel uploaded by the seepage pressure sensor, the integrated gas sensor, and the displacement sensor are respectively received, and compared with the corresponding safety threshold to judge whether an alarm is issued, and the early warning of the disaster is realized. and risk control to ensure the stability of the tunnel.

As another implementation manner, the repeater is also connected to the control center; the control center is also used to predict the pressure change of the tunnel, and then determine the stability of the tunnel, and the process is as follows:

Call the EDEM software program to model the shield tunnel segment;

Build the formation model, and then combine the shield tunnel segment model to obtain the tunnel model;

Initialize shield tunnel segment and stratum soil parameters;

Coupling EDEM software and FLUENT software, receiving the preset air pressure data of the shield tunnel segment and the tunnel water seepage pressure obtained in real time, numerically calculating the tunnel model to obtain the deformation value of the shield tunnel segment, and then comparing it with the preset safety critical value, Predict if the tunnel is stable.

Among them, EDEM is the world's first general-purpose CAE software designed with modern discrete element model technology to simulate and analyze particle processing and production operations. Design, test and optimize various types of bulk material handling equipment.

FLUENT is a relatively popular commercial CFD software package in the world, with a market share of 60% in the United States. It can be used by all industries related to fluids, heat transfer and chemical reactions. It has rich physical models, advanced numerical methods and powerful pre- and post-processing functions.

This embodiment also realizes the pressure change prediction through the numerical analysis coupling interface, and then analyzes and judges the stability of the tunnel, improves the accuracy of the tunnel stability prediction, and ensures the stability of the tunnel structure.

Example 3

A tunnel monitoring method in this embodiment includes:

The tunnel is divided into several sections, and each section is provided with a repeater and several shield tunnel segments as described in Example 1, and these shield tunnel segments wrap the entire tunnel section;

Receive the seepage pressure of the tunnel, the type and concentration of harmful gases in the tunnel, and the displacement and deformation of the tunnel uploaded by the seepage pressure sensor, the integrated gas sensor, and the displacement sensor, respectively, and compare them with the corresponding safety thresholds to determine whether to alarm.

In this embodiment, the water seepage pressure of the tunnel, the type and concentration of harmful gases in the tunnel, and the displacement and deformation of the tunnel uploaded by the seepage pressure sensor, the integrated gas sensor, and the displacement sensor are respectively received, and compared with the corresponding safety threshold to judge whether an alarm is issued, and the early warning of the disaster is realized. and risk control to ensure the stability of the tunnel.

In another embodiment, the monitoring method of the tunnel monitoring system further includes:

Predict the pressure change of the tunnel, and then judge the stability of the tunnel. The process is as follows:

Call the EDEM software program to model the shield tunnel segment;

Build the formation model, and then combine the shield tunnel segment model to obtain the tunnel model;

Initialize shield tunnel segment and stratum soil parameters;

Coupling EDEM software and FLUENT software, receiving the preset air pressure data of the shield tunnel segment and the tunnel water seepage pressure obtained in real time, numerically calculating the tunnel model to obtain the deformation value of the shield tunnel segment, and then comparing it with the preset safety critical value, Predict if the tunnel is stable.

Among them, EDEM is the world's first general-purpose CAE software designed with modern discrete element model technology to simulate and analyze particle processing and production operations. Design, test and optimize various types of bulk material handling equipment.

FLUENT is a relatively popular commercial CFD software package in the world, with a market share of 60% in the United States. It can be used by all industries related to fluids, heat transfer and chemical reactions. It has rich physical models, advanced numerical methods and powerful pre- and post-processing functions.

This embodiment also realizes the pressure change prediction through the numerical analysis coupling interface, and then analyzes and judges the stability of the tunnel, improves the accuracy of the tunnel stability prediction, and ensures the stability of the tunnel structure.

The above descriptions are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims (10)

1. A shield tunnel segment, comprising:

a segment main body having an arc shape of one eighth;

the pipe piece comprises a pipe piece body and is characterized in that the opposite positions of two sides of the pipe piece body are respectively provided with a cube, a seepage pressure pipe is buried in the cube, a seepage pressure sensor is arranged in the seepage pressure pipe, and the seepage pressure sensor is used for monitoring the seepage pressure of a tunnel in real time; an integrated gas sensor is also embedded in the cubic block and used for monitoring the type and concentration of harmful gases in the tunnel in real time;

a displacement sensor is embedded in the duct piece main body and used for monitoring displacement deformation of the tunnel in real time; water-resisting layers are arranged at the positions which are far away from the inner wall 1/3 and the outer wall 1/3 of the pipe piece main body; the edge of section of jurisdiction main part all is provided with the sealing layer.

2. The shield tunnel segment of claim 1, wherein the segment body is formed of a plastic concrete cast steel skeleton, achieving strength while satisfying cooperative deformation.

3. The shield tunnel segment of claim 1, wherein the water barrier is made of a polypropylene fiber material.

4. The shield tunnel segment of claim 1, wherein the sealing layer is a high-polymerization degree polyvinyl chloride tie strip.

5. The shield tunnel segment of claim 1, wherein the integrated gas sensor is comprised of an electrochemical carbon monoxide sensor, an electrochemical hydrogen sulfide sensor, an electrochemical sulfur dioxide sensor, and an optical interference methane sensor, for monitoring carbon monoxide, hydrogen sulfide, sulfur dioxide, and methane and their respective concentrations, respectively.

6. A tunnel monitoring system, comprising:

-repeaters spaced apart in the tunnel and a plurality of shield tunnel segments according to any one of claims 1-5 which cover the entire tunnel section;

the osmotic pressure sensor, the integrated gas sensor and the displacement sensor in the shield tunnel duct piece are connected with the repeater; the relay is used for receiving tunnel water seepage pressure, types and concentrations of harmful gases in the tunnel and tunnel displacement deformation which are respectively uploaded by the seepage pressure sensor, the integrated gas sensor and the displacement sensor, comparing the received values with corresponding safety thresholds and judging whether to give an alarm or not.

7. The tunnel monitoring system of claim 6, wherein the repeater is further connected to a control center; the control center is also used for predicting the pressure change of the tunnel so as to judge the stability of the tunnel, and the process is as follows:

calling an EDEM software program to model the shield tunnel segment;

constructing a stratum model, and further combining a shield tunnel segment model to obtain a tunnel model;

initializing shield tunnel segments and stratum soil parameters;

and coupling the EDEM software and the FLUENT software, receiving preset air pressure data of the shield tunnel segment and tunnel water seepage pressure acquired in real time, carrying out numerical calculation on a tunnel model to obtain a deformation value of the shield tunnel segment, and comparing the deformation value with a preset safety critical value to predict whether the tunnel is stable.

8. The tunnel monitoring system of claim 6 wherein the repeater is further connected to an alarm device.

9. A method for monitoring a tunnel, comprising:

dividing the tunnel into segments, each segment being provided with a repeater and a plurality of shield tunnel segments according to any one of claims 1-5, which shield tunnel segments enclose the entire tunnel section;

and receiving the tunnel water seepage pressure, the type and the concentration of harmful gas in the tunnel and the tunnel displacement deformation which are respectively uploaded by the osmotic pressure sensor, the integrated gas sensor and the displacement sensor, comparing the received values with corresponding safety thresholds, and judging whether to alarm.

10. The method for monitoring a tunnel according to claim 9, wherein the method for monitoring a tunnel monitoring system further comprises:

predicting the pressure change of the tunnel, and further judging the stability of the tunnel, wherein the process is as follows:

calling an EDEM software program to model the shield tunnel segment;

constructing a stratum model, and further combining a shield tunnel segment model to obtain a tunnel model;

initializing shield tunnel segments and stratum soil parameters;

and coupling the EDEM software and the FLUENT software, receiving preset air pressure data of the shield tunnel segment and tunnel water seepage pressure acquired in real time, carrying out numerical calculation on a tunnel model to obtain a deformation value of the shield tunnel segment, and comparing the deformation value with a preset safety critical value to predict whether the tunnel is stable.

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