CN111781121A - Subway surface subsidence early warning system - Google Patents
Subway surface subsidence early warning system Download PDFInfo
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- CN111781121A CN111781121A CN202010629396.1A CN202010629396A CN111781121A CN 111781121 A CN111781121 A CN 111781121A CN 202010629396 A CN202010629396 A CN 202010629396A CN 111781121 A CN111781121 A CN 111781121A
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- 239000000700 radioactive tracer Substances 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000012806 monitoring device Methods 0.000 claims abstract description 12
- 230000008054 signal transmission Effects 0.000 claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 11
- 230000000007 visual effect Effects 0.000 claims abstract description 7
- 238000009792 diffusion process Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 claims 1
- 238000009991 scouring Methods 0.000 claims 1
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 239000002689 soil Substances 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000003141 isotope labeling method Methods 0.000 description 1
- 230000000155 isotopic effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000004452 microanalysis Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object
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- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention provides a subway ground surface subsidence early warning system which comprises a pre-buried isotope tracer filling pipe, a signal monitoring device, a signal transmission device, a signal processing system and a ground surface subsidence early warning system. After the isotope tracer filling pipe is embedded into the lining wall of the subway tunnel segment, hydrophilic reagent dimethylolpropionic acid (DMPA) mixed with the isotope tracer filling pipe is periodically filled in the tunnel construction period18An O isotope tracer, wherein the tracer has the characteristic of carrying out tracing along the reverse propagation of the water seepage direction; the signal monitoring device can monitor the propagation path of the isotope and convert the path into a current signal; signal transmission deviceCollecting the monitored isotope tracer diffusion signals and transmitting the signals into a signal processing system; the signal processing system converts the received signals into three-dimensional visual images to obtain a settled displacement field; the surface subsidence early warning system can judge the state of the cavity below the surface according to the signal processing result and send out subsidence early warning in time.
Description
Technical Field
The invention relates to the field of subway construction surface subsidence monitoring and forecasting and prevention and control of subsidence disasters, in particular to a subway surface subsidence early warning system.
Background
In the construction process of the subway tunnel shield, the earth surface subsidence or sudden collapse can be caused due to the consolidation of the earth layer caused by the stratum loss and the groundwater flow loss, and property loss and casualties are caused. According to statistics, as long as 1 month 2020, in 46 cities, including harbors, australia and desks, where China owns subways, 92 people die and 34 people are injured due to the occurrence of the ground surface subsidence accident 78, and the economic property loss is not quantifiable. The collapse disasters generally exist in the field of subway construction, and the forecast and prevention of the collapse disasters are great problems which are not solved so far.
The isotope is an atom with the same number of protons and different numbers of neutrons in an atomic nucleus, and the isotope content is expressed by the isotopic abundance, namely the percentage content of a certain isotope in an element in the atom. The isotope labeling method is a microanalysis method for labeling a research object by using a radionuclide as a tracer. And forming a visual image according to the diffusion distribution of the particles in the research object to obtain the change state of the research object.
Disclosure of Invention
In order to solve the problem of surface subsidence prediction in the conventional subway construction, the invention provides a surface subsidence early warning system which can timely and accurately forecast the surface subsidence and reduce property loss and casualties.
The invention provides a subway ground surface subsidence early warning system which comprises a pre-buried isotope tracer filling pipe, a signal monitoring device, a signal transmission device, a signal processing system and a ground surface subsidence early warning system.
Preferably, after the isotope perfusion tube is pre-embedded in the lining wall of the tube piece at the top end of the tunnel, a release hole is reserved every 10 m. Periodically during tunnel construction, the mixture of hydrophilic agent dimethylolpropionic acid (DMPA) is poured through the pouring tube18And the O isotope tracer is used for detecting whether the water seepage phenomenon of the cracks possibly causing surface subsidence exists in the stratum.
Preferably, the signal monitoring device is capable of automatically identifying the propagation path of the isotope tracer, collecting the pulse signal, and converting it into a current signal.
Preferably, the signal transmission device transmits the underground monitoring signal to an above-ground signal processing system for subsequent processing.
Preferably, the signal processing system converts the received current signal into a displacement field three-dimensional visual image, and displays the moving direction and magnitude of the displacement vector.
Preferably, the surface subsidence early warning system automatically gives a forecast warning according to a calculation result of the signal processing system.
Has the advantages that: the subway ground surface subsidence early warning system skillfully utilizes an isotope tracing principle to invert the movement conditions of the stratum above the tunnel and below the ground surface and forecast the possible ground surface subsidence. The system is simple in structure and convenient to arrange, and only needs to be arranged along with the tunnel during the previous tunnel construction. After the arrangement is finished, the system is controlled by a computer on the ground, and the operation is simple. Because in the current subway tunnel construction, ground surface subsidence disasters occur every year, casualties and huge property losses are caused. By applying the method and the device, early warning can be performed before a disaster occurs, blocking measures can be taken in time, and the safety of subway construction is improved.
Drawings
FIG. 1 is a schematic view of the monitoring system layout according to the present invention; fig. 2 is a schematic diagram of a signal processing and early warning system according to the present invention.
Firstly, a signal monitoring and transmitting device; filling the pipe with isotope tracer; thirdly, water seepage cracks; fourthly, a settling tank.
The accompanying drawings, which are included to provide a further understanding of the invention, are not to be considered limiting of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It is to be understood that descriptive terms such as "comprises/comprising" and "consisting of … …," or any other variation thereof, in this disclosure are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method if desired. Without further limitation, elements recited by the phrases "comprising" and "consisting of … …" do not exclude the presence of additional like elements in a product, device, process, or method that includes the recited elements.
As shown in fig. 1 and 2, in an embodiment of the present invention, a system for warning a surface subsidence of a subway is provided, which comprises: the isotope tracer filling pipe is pre-embedded after the top end of the tunnel is lined with the wall, a release port is reserved every 10m, and a signal monitoring device and a signal transmission device are pre-embedded along the filling pipe. During tunnel construction, the isotope tracers are periodically poured through the filling pipe. If water seepage occurs in the overburden layer on the tunnel, the tracer agent is transmitted along the water seepage crack to find a source. The signal monitoring device monitors the propagation path of the isotope tracer and transmits the signal to the signal processing system along the signal transmission device. And (5) analyzing and processing by a signal processing system, inverting the displacement field three-dimensional visual image of the subsurface soil layer, and giving an alarm when the displacement reaches a certain threshold value. The part can be treated in time according to system alarm, and the ground surface collapse disaster is prevented.
In the invention, the isotope tracer is selected from the isotope which can trace the water source and the migration of the water source18The O + hydrophilic agent dimethylolpropionic acid (DMPA), which acts to guide the tracer to travel in the reverse direction along the water-percolation direction.
In the invention, the signal monitoring device adopts a CS-DET series integrated detector of Beijing Zhonghuahai science and technology Limited, and the detector converts the recorded pulse into a current signal and then transmits the current signal into a signal processing system. Three detectors are arranged in each interval tunnel, and the detectors are arranged at the head, the tail and the middle of each interval tunnel, so that the signal monitoring accuracy is improved.
In the invention, the signal transmission device adopts a signal transmission line matched with a CS-DET series integrated detector of Beijing Zhonghuahai science and technology Limited company, is synchronously embedded along an isotope tracer grouting pipe and is connected with a signal processing system on the ground.
In the invention, the signal processing system converts the received current signal into a three-dimensional visual image representing a soil displacement field, and the movement condition of the soil can be judged according to the distribution state of the displacement vector.
In the invention, the ground surface subsidence early warning system sends out corresponding indication signals according to the movement condition of the soil body: when the soil displacement is less than 10 mm, the indication signal is green; when the soil body displacement is less than or equal to 10 mm and less than 30 mm, the indicating signal is yellow; when the soil displacement is larger than or equal to 30 mm, the indication signal is red, and a settlement early warning is sent. The larger soil body displacement is easy to induce the ground surface settlement or the ground surface collapse, so reinforcement measures such as grouting and the like are taken in time according to the early warning signal, and the ground surface settlement disaster is avoided.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations and modifications can be made, which are consistent with the principles of the invention, from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. The subway ground surface subsidence early warning system is characterized by comprising a pre-buried isotope tracer filling pipe, a signal monitoring device, a signal transmission device, a signal processing system and a ground surface subsidence early warning system.
2. After the isotope tracer filling pipe is pre-embedded into a lining wall of a subway tunnel, a tracer is periodically filled during the tunnel construction period, and the tracer has the characteristic of carrying out tracing along the water seepage direction in a reverse direction; the signal monitoring device can monitor the propagation path of the isotope and convert the path into an electric signal; the signal transmission device collects the monitored isotope tracer diffusion signals and transmits the signals to a signal processing system; the signal processing system converts the received signals into three-dimensional visual images to obtain a settled displacement field; the surface subsidence early warning system judges the state of the cavity below the surface according to the signal processing result and sends out subsidence early warning in time.
3. The isotope tracer filling pipe according to claim 1, wherein a release port is reserved every 10m after being pre-embedded in the lining wall at the top end of the tunnel, and isotope tracer filling leak detection is performed periodically; the released tracer agent reversely propagates along the water seepage direction to find a water seepage source; if the water seepage amount is large, the density of the concentrated isotope tracer at the position is large, and the signal is strong; if the situation occurs below the earth surface, underground cavities are easily formed, and the earth surface is suddenly collapsed after reaching a certain degree.
4. The signal monitoring device of claim 1, wherein the signal monitoring device is embedded in synchronization with the isotope tracer-filled pipe, and the signal is monitored and transmitted to the signal transmission device after the isotope propagates in the water seepage direction.
5. The signal transmission device of claim 1, connected to a signal monitoring device along the line, for collecting the monitored isotope diffusion signal for transmission to a signal processing system.
6. The signal processing system of claim 1, wherein the received electrical signals are converted into visual images to construct a three-dimensional displacement field state, and the region and severity of settlement are visually displayed.
7. The system of claim 1, wherein the pre-warning system is capable of analyzing the cavities caused by water seepage or scouring under the earth surface, and then sending out pre-warning forecast in time, so that the staff can take treatment measures at corresponding positions according to the pre-warning to prevent collapse disasters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010629396.1A CN111781121B (en) | 2020-07-03 | 2020-07-03 | Subway surface subsidence early warning system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010629396.1A CN111781121B (en) | 2020-07-03 | 2020-07-03 | Subway surface subsidence early warning system |
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| CN111781121A true CN111781121A (en) | 2020-10-16 |
| CN111781121B CN111781121B (en) | 2023-01-31 |
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|---|---|---|---|---|
| US4921346A (en) * | 1987-09-18 | 1990-05-01 | Agency Of Industrial Science And Technology | Tunnel current detecting photo-acoustic spectrometer |
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| CN1071224A (en) * | 1991-09-28 | 1993-04-21 | 北京市西城区新开通用试验厂 | A kind of measuring, alarming, tracing and transmitting in conjuction with drill |
| CN105527452A (en) * | 2015-12-21 | 2016-04-27 | 山东科技大学 | Isotope-labeled method for measuring pressure bearing water quantity of water-intercepted bottom plate |
| CN106437844A (en) * | 2016-10-26 | 2017-02-22 | 重庆大学 | Method for advanced forecast of tunnel water inflow position |
| CN108195742A (en) * | 2018-02-12 | 2018-06-22 | 浙江大学 | A kind of device and method for quickly measuring a variety of sand infiltration coefficients |
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2020
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