Safety combined monitoring device for side slope and front slope of tunnel

Abstract

The utility model belongs to the technical field of tunnel engineering monitoring, and relates to a tunnel side and front slope safety combined monitoring device which comprises portal side slopes arranged on the left side and the right side of a tunnel portal and a portal front slope arranged above the tunnel portal. The tunnel side and front slope safety combined monitoring device comprises a tunnel opening side slope and a tunnel opening front slope, anchor rod frame beams serving as side and front slope reinforcing measures are arranged in the tunnel opening side slope and the tunnel opening front slope, each anchor rod frame beam is composed of an anchor rod and a reinforcing mesh, and the tunnel side and front slope safety combined monitoring device comprises a monitoring instrument, at least four seismic pickup sensors connected with the monitoring instrument and the anchor rods. The four seismic pickup sensors are respectively arranged at the bottoms of the hole slopes on the left side and the right side and the tops of the left upper portion and the right upper portion of the hole upward slope, and the seismic pickup sensors are installed at the ends of the anchor rods at the corresponding positions, so that internal damage signals of the edge upward slope are collected through the anchor rods and transmitted to the monitor, and the monitor is used for monitoring the internal damage of the edge upward slope. Therefore, the combined monitoring of the tunnel side slope and the tunnel front slope is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel engineering monitoring and relates to a tunnel side slope safety combined monitoring device. Background Art

[0002] Slopes can be divided into artificial slopes and natural slopes. Whether artificial or natural, they will slide down the slope as a whole or in a scattered manner along a certain weak surface or weak zone under the action of gravity, which will cause landslides. Landslides are extremely harmful, not only causing major economic losses, but also seriously endangering the lives of the people. Therefore, monitoring slopes is an indispensable task.

[0003] During the construction and operation of tunnels, slopes may deform to varying degrees, and even cause highly destructive disasters such as landslides and collapses, which seriously affect the normal construction and use of tunnels. Continuously and effectively monitoring the deformation of slope surfaces and deep rock masses is not only conducive to evaluating the stability of tunnel slopes, but also provides data support for disaster prediction and early warning, which is of great significance. Traditional slope monitoring technology mainly relies on instruments such as total stations or theodolites to regularly monitor the coordinates of monitoring points using geodetic methods. With the rapid development of electronic information technology, high-tech technologies such as fiber grating sensing technology, three-dimensional laser scanning technology, digital close-range photogrammetry technology, synthetic aperture radar interferometry technology and global navigation satellite systems have emerged, and slope monitoring has gradually shown the characteristics of intelligence, automation and visualization.

[0004] However, traditional slope monitoring technologies, such as borehole inclinometers, require drilling holes in advance to bury monitoring equipment and manually record data. They have low automation and measurement accuracy, are time-consuming and labor-intensive, and are point-based measurements, making it difficult to achieve large-scale, long-distance data measurements. High-tech technologies such as fiber grating sensing technology and three-dimensional laser scanning technology also generally have problems such as high cost, complex data processing, and susceptibility to weather and environmental interference, which limit their application in slope engineering. Utility Model Content

[0005] In view of this, the utility model proposes a tunnel side slope joint monitoring device based on the goal of "reducing costs and increasing efficiency". The device uses anchor rods and steel mesh in the frame beam to transmit rock micro-vibration signals caused by slope deformation, and 4 seismic sensors form a monitoring network covering the entire area to solve the problems of increased cost, time and labor caused by large-area deployment of sensors in existing slope monitoring technologies, and realizes automated surface monitoring of tunnel side slope deformation.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] A tunnel side slope joint monitoring device, the tunnel side slope includes a portal side slope arranged on the left and right sides of a tunnel portal and a portal back slope arranged above the tunnel portal, both the portal side slope and the portal back slope have anchor frame beams as a slope reinforcement measure, and the anchor frame beams are composed of anchors and steel meshes, the tunnel side slope joint monitoring device includes a monitor, a seismic pickup sensor connected to the monitor, and an anchor, the number of the seismic pickup sensors is at least four, and the four seismic pickup sensors are respectively arranged at four positions, namely, the bottom of the portal side slope on the left and right sides and the top of the portal back slope on the upper left and upper right sides, and the seismic pickup sensors are installed at the ends of the anchors at corresponding positions, so as to collect internal damage signals of the side slope through the anchors, and transmit the signals to the monitor, so as to realize joint monitoring of the tunnel side slope.

[0008] Furthermore, the monitoring instrument has a display screen, a signal acquisition card and analysis software to analyze and process the internal damage signal of the slope collected by the seismic sensor to obtain the stress and displacement development trend of the slope.

[0009] Furthermore, the bottom of the vibration pickup sensor is adsorbed on the end of the anchor rod through a strong magnetic sheet.

[0010] Furthermore, the vibration pickup sensor is connected to the monitor via a cable.

[0011] The beneficial effects of the utility model are:

[0012] The utility model provides a tunnel side slope joint monitoring device, which uses the anchor frame beam in the existing slope reinforcement measures to cooperate with four vibration sensors installed at the bottom of the left and right side entrance slopes and the upper left and upper right tops of the entrance slope to obtain the rock and soil damage signal inside the tunnel side slope, which can achieve the purpose of economical, efficient and joint monitoring of the tunnel side slope, and the vibration sensor is electrically connected to the monitor through a cable, realizing the automatic surface monitoring of the deformation of the tunnel side slope. Secondly, the device connects the sensor and the anchor rod together through a strong magnetic sheet, which is low-cost, simple to install and recyclable.

[0013] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0015] Figure 1 It is a front structural schematic diagram of a tunnel side slope combined monitoring device in the utility model;

[0016] Figure 2 It is a side structural schematic diagram of a tunnel side slope combined monitoring device in the utility model.

[0017] Figure numerals: 1-monitor, 2-cable, 3-vibration sensor, 4-anchor frame beam, 5-anchor, 6-strong magnetic sheet, 7-side slope ground line, 8-tunnel entrance slope, 9-side slope junction platform, 10-tunnel entrance slope, 11-tunnel, 12-tunnel portal. DETAILED DESCRIPTION

[0018] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0019] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0020] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] See also Figure 1-2The tunnel side slope includes a portal side slope 10 arranged on the left and right sides of a tunnel portal 12 and a portal back slope 8 arranged above the tunnel portal 12. Both the portal side slope 10 and the portal back slope 8 are provided with an anchor frame beam 4 as a side slope reinforcement measure. The anchor frame beam 4 is composed of an anchor rod 5 and a steel mesh, and the anchor rod 5 passes through the side slope ground line 7. The tunnel portal 12 is connected to a tunnel 11, and a side slope junction platform 9 is provided at the junction of the portal back slope 8 and the portal side slope 10.

[0022] This embodiment provides a tunnel side slope joint monitoring device, including a monitoring instrument 1, a cable 2, a vibration sensor 3, a strong magnetic sheet 6, and an anchor rod 5 for collecting damage and deformation inside the side slope;

[0023] The monitoring instrument 1 has a display screen, a signal acquisition card and analysis software, and can obtain the stress and displacement development trend of the slope by analyzing the internal damage signal of the slope collected by the vibration sensor 3;

[0024] The anchor rod 5 is automatically formed by the anchor rod 5 and the steel mesh in the anchor rod frame beam 4 in the slope reinforcement measures. During installation, the bottoms of the four seismic sensors 3 are adsorbed on the ends of the anchor rod 5 at four positions, namely, the bottom of the left and right tunnel entrance slopes 10 and the upper left and upper right tops of the tunnel entrance back slope 8, through strong magnetic sheets 6, to form a joint monitoring area for the tunnel side back slope, and the seismic sensors 3 are electrically connected to the monitor 1 through the cable 2 to transmit the internal slope damage signals collected by the seismic sensors 3 to the monitor 1.

[0025] The key technical principle of this application is the microseismic monitoring principle. When the surface of the side slope or the deep rock mass is deformed, the local broken area will emit sound. At the same time, the stress wave propagates outward from the broken area through the surrounding medium, and is collected by sensors arranged near the surface of the material, and received, recorded, interpreted and displayed by the host equipment, ultimately realizing the monitoring of the position and stress state of the damaged area of ​​the tunnel side slope.

[0026] Specifically, taking a tunnel entrance side slope project in Chongqing as an example, the above tunnel side slope joint monitoring device is used to ensure the safety of the side slope:

[0027] When installing the on-site equipment, four vibration sensors 3 are arranged at the ends of the anchor rods 5 in the anchor rod frame beam 4 at four positions: the bottom of the left and right side entrance slopes 10 of the tunnel portal 12 and the upper left top and upper right top of the entrance back slope 8; when the surface of the back slope or the deep rock mass is deformed, a microseismic signal is generated, which is collected by the vibration sensor 3 through the anchor rod and transmitted to the monitor 1. The data analysis software in the monitor 1 processes and analyzes the vibration signal and displays the safety status of the slope to realize the joint monitoring of the tunnel side slope.

[0028] Preferably, the vibration pickup sensor 3 is fixedly mounted on the anchor rod 5 via a strong magnetic sheet 6 .

[0029] In other embodiments, the number of the vibration pickup sensors 3 can be set to 5, 6 or more, and more than four vibration pickup sensors 3 can be set at other positions on the side slope to more comprehensively monitor the side slope of the tunnel; or two vibration pickup sensors 3 can be set at the same location as redundant equipment.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A tunnel side slope safety joint monitoring device, the tunnel side slope includes a tunnel entrance side slope arranged on the left and right sides of the tunnel portal and a tunnel entrance back slope arranged above the tunnel portal, the tunnel entrance side slope and the tunnel entrance back slope both have an anchor frame beam as a side slope reinforcement measure, and the anchor frame beam is composed of anchors and steel mesh, characterized in that: The tunnel side slope safety joint monitoring device includes a monitor, a seismic pickup sensor connected to the monitor, and an anchor rod. There are at least four seismic pickup sensors, and the four seismic pickup sensors are respectively arranged at four positions: the bottom of the left and right side slopes of the tunnel entrance and the top of the upper left and upper right side slopes of the tunnel entrance. The seismic pickup sensors are installed at the ends of the anchor rods at the corresponding positions to collect internal damage signals of the side slopes through the anchor rods and transmit the signals to the monitor to realize joint monitoring of the tunnel side slopes.

2. The tunnel side slope safety joint monitoring device according to claim 1 is characterized by: The monitoring instrument has a display screen, a signal acquisition card and analysis software to analyze and process the internal damage signal of the slope collected by the seismic sensor to obtain the stress and displacement development trend of the slope.

3. The tunnel side slope safety joint monitoring device according to claim 1 is characterized by: The bottom of the vibration pickup sensor is adsorbed on the end of the anchor rod through a strong magnetic sheet.

4. The tunnel side slope safety joint monitoring device according to claim 1 is characterized by: The vibration pickup sensor is connected to the monitor via a cable.

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