CN104407375A - Underground probe of earthquake prediction instrument - Google Patents
Underground probe of earthquake prediction instrument Download PDFInfo
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- CN104407375A CN104407375A CN201410630927.3A CN201410630927A CN104407375A CN 104407375 A CN104407375 A CN 104407375A CN 201410630927 A CN201410630927 A CN 201410630927A CN 104407375 A CN104407375 A CN 104407375A
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- optical fiber
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Abstract
The invention relates to an underground probe of an earthquake prediction instrument and is specially suitable for predicting shallow-focus earthquakes. The underground probe comprises an elastic plastic shell, an upper cover, a U-shaped optical fiber sensor and a sensor unit which is located in the shell of the sensor unit. The U-shaped optical fiber sensor consists of a U-shaped steel wire rope and optical fibers spirally twisted on the U-shaped steel wire rope. A suspended optical fiber sensor comprises an oil pipe which is located at the middle axis of a plastic packaged shell and is more than 7km away from the bottom of the plastic packaged shell, a suspended optical fiber which is located on the central line of the oil pipe and a heavy hammer which is tied to the lower end of the suspended optical fiber; and a reflecting surface is arranged at the lower end of the suspended optical fiber on the upper surface of the heavy hammer. The underground probe of the earthquake prediction instrument is applicable to exploring the stressing condition of underground deep rock and has the advantages of high exploring sensitivity and high accuracy.
Description
Technical field
The present invention relates to a kind of earth-quake predictor underground probe.The prediction of special adaptation shallow-focus earthquake.
Technical background
Existing earthquake subsurface investigation instrument is subject to the restriction of material and manufacture craft, underground can not be taken in too dark, be difficult to accurately measure tens even the rock stratum stressing conditions of tens kilometers of degree of depth under from earth's surface to rock stratum, therefore, affect sensitivity and the accuracy of its earthquake prediction.
Summary of the invention
Technical matters to be solved by this invention is to provide the sensitivity of a kind of applicable Underground deep layer rock stratum stressing conditions and the high earth-quake predictor underground probe of accuracy.
The technical solution adopted for the present invention to solve the technical problems:
The present invention includes the sensor group that there is flexible plastic packaging housing, upper cover, U-shaped Fibre Optical Sensor and be arranged in sensor group housing.
Described U-shaped Fibre Optical Sensor is made up of U-shaped wire rope and the optical fiber be spirally wound on U wire rope.
Described pendency Fibre Optical Sensor comprises oil pipe that the height being positioned at position, described plastic packaging housing axis is more than 7km, be positioned at the pendency optical fiber on described oil pipe center line and lie in the weight of pendency light lower end; Reflecting surface is provided with in the lower end of the pendency optical fiber of the upper surface of weight.
Described sensor group housing is positioned at the lower end of described plastic packaging housing; The signal wire of described plastic packaging housing, U-shaped Fibre Optical Sensor, oil pipe, sensor group housing, sensor group and power lead are by TPV material plastic packaging global formation.
Described sensor group comprises temperature sensor, humidity sensor, pressure transducer, electromagnetic sensor and acidity-basicity sensor.
The described optical fiber be spirally wound on U-shaped wire rope is a single-mode fiber.
The described optical fiber be spirally wound on U-shaped wire rope is 2 optical fiber, and one is single-mode fiber, and another root is multimode optical fiber, and described 2 optical fiber are alternate is spirally wound on described U-shaped wire rope.
In described oil pipe, be full of transformer oil, the working temperature of described transformer oil is-40-80 DEG C.
The intensity of described TPV material is at more than 70MPa.
The height of described plastic packaging housing is more than 10km.
Beneficial effect of the present invention is as follows:
(1) U-shaped Fibre Optical Sensor of the present invention can detect the stressed and deformation parameter in the continuous print rock stratum on tens kilometers, below earth's surface, and the limit of the avalanche of prediction strata structure, cracking and direction, measuring accuracy can reach within ten meters.
(2) pendency Fibre Optical Sensor of the present invention can detect and conduct from the slight low frequency of earth formation and high-frequency vibration, and accurately can locate the position of vibroseis on the ground by being positioned at optical time domain reflectometer (OTDR), measuring accuracy can reach within hundred meters.
(3) the various sensors in sensor group of the present invention can measure the many kinds of parameters information of underground, as temperature, pressure, humidity, electromagnetism intensity and potential of hydrogen etc., are conducive to the time of origin that comprehensive analysis is predictably shaken.
(4) the pendency optical fiber of pendency Fibre Optical Sensor directly can be extracted out from oil pipe, is convenient to change, easy for operation.
(5) arrange to pop one's head in the underground of the present invention of more than tens in the area that earthquake easily occurs, and connect into network and carry out distributed large data acquisition, for the scientific research such as earthquake prediction and environmental improvement provides powerful test platform.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
The schematic diagram of the U-shaped Fibre Optical Sensor that Fig. 2 single-mode fiber is wound around.
Fig. 3 is the schematic diagram of the U-shaped Fibre Optical Sensor that a single-mode fiber and a root multimode fiber are wound around.
Fig. 4 is the theory diagram of the earth-quake predictor utilizing underground of the present invention probe composition.
Fig. 5 is the power scattering curve under normal circumstances that OTDR records.
Fig. 6 is the power scattering curve under the abnormal conditions that record of OTDR.
In figs. 1-6,1 joints of optical fibre, 2 joints of optical fibre, 3 upper covers, 4 plastic packaging housings, 5 U-shaped Fibre Optical Sensors, 5-1 wire rope, 5-2 single-mode fiber, 5-3 multimode optical fiber, 6 oil pipes, 7 transformer oil, 8 pendency optical fiber, 9 surface of emissions, 10 weights, 11 sensor group housings, 12 power leads, 13 signal wires, 14 joints of optical fibre, 15 optical fiber head end reflection peaks, 16 constant-slope districts, 17 fiber end reflections peaks.
P axle is power shaft (unit W), and t axle is time shaft (unit minute or day) or with d axle (distance axis, unit km).
Described constant-slope district 16 represents optical fiber integrally power attenuation, is also the main region measuring stressed change.
Embodiment
From the embodiment shown in Fig. 1-3, it comprises the sensor group having flexible plastic packaging housing 4, upper cover 3, U-shaped Fibre Optical Sensor 5 and be arranged in sensor group housing 11.
Described U-shaped Fibre Optical Sensor 5 is made up of U-shaped wire rope 5-1 and the optical fiber be spirally wound on U wire rope 5-1.
Described pendency Fibre Optical Sensor comprises oil pipe 6 that the height being positioned at position, described plastic packaging housing 4 axis is more than 7km, be positioned at the pendency optical fiber 8 on described oil pipe 6 center line and lie in the weight 10 of pendency optical fiber 8 lower end; Reflecting surface 9 is provided with in the lower end of the pendency optical fiber 8 of the upper surface of weight 10.
Described sensor group housing 11 is positioned at the lower end of described plastic packaging housing 4; The signal wire 13 of described plastic packaging housing 4, U-shaped Fibre Optical Sensor 5, oil pipe 6, sensor group housing 11, sensor group and power lead 12 are by TPV material plastic packaging global formation.
Described sensor group comprises temperature sensor, humidity sensor, pressure transducer, electromagnetic sensor and acidity-basicity sensor.
The described optical fiber be spirally wound on U-shaped wire rope 5-1 is a single-mode fiber 5-2.
In the present embodiment, described in the optical fiber be spirally wound on U-shaped wire rope 5-1 also can be 2 optical fiber, one is single-mode fiber 5-2, and another root is multimode optical fiber 5-3, and described 2 optical fiber are alternate is spirally wound on described U-shaped wire rope 5-1.
Be full of transformer oil 7 in described oil pipe 6, the working temperature of described transformer oil 7 is-40-80 DEG C.
The intensity of described TPV material is at more than 70MPa.
The height of described plastic packaging housing 4 is more than 10km.
In the present embodiment, the effect of U-shaped Fibre Optical Sensor is as follows:
U-shaped Fibre Optical Sensor contacts with subterranean strata with by plastic packaging housing 4, intensity due to TPV material is more than 70MPa, described plastic packaging housing 4 has some strength and elasticity, and when the stressed generation motion of subterranean strata, the stress signal of rock stratum passes by U-shaped Fibre Optical Sensor.
The effect of pendency Fibre Optical Sensor is as follows:
Pendency Fibre Optical Sensor is for measuring the vibration signal from rock stratum, described vibration signal makes the light signal in pendency optical fiber 8 change, the light signal of change passes in OTDR and shows, for gathering the signal of low-frequency vibration in the middle part of pendency optical fiber 8, its underpart is for gathering the vibration signal of high frequency.
Fig. 4 is the theory diagram of the earth-quake predictor utilizing underground of the present invention probe composition, and in the diagram, the length of underground probe is 10-30km.
The earth-quake predictor course of work shown in Fig. 4 is as follows:
(1) OTDR is received the joints of optical fibre 2 of the underground probe shown in Fig. 1, employing optical fiber pigtail connects, as shown in Figure 5 (namely test curve) under normal circumstances, this curve data can carry out experiment measuring and put on record the back scattering powertrace recorded after just laying underground probe.
(2) if noted abnormalities, test curve as shown in Figure 6, produces bending or sudden change, then represents that U-shaped Fibre Optical Sensor is subject to stress in the middle of curve, the degree of the slope reflection pressurized of sudden change, the i.e. stressed degree in rock stratum.The spatial dimension of the scope reflection pressurized of sudden change, the scope that namely rock stratum is stressed.
(3) adopt bidirectional measurement method: namely U-shaped Fibre Optical Sensor 5 two uses OTDR to measure once respectively, or use two OTDR to measure in the two directions.Reference curve also will use bidirectional measurement method to obtain the reference data of U-shaped Fibre Optical Sensor 5 both direction.Daily monitoring can use unidirectional mensuration, but once occur abnormal, must with the use of bidirectional measurement method.
(4) alarm parameter:
The abnormal curve obtain daily measurement and original normal reference curve compare, and comparison process by data input microprocessor, so just can be monitored in real time.If namely 0.5 % that rate of curve change reaches former slope sends earthquake prediction alarm.If the rate of curve variation range of the region of same slope variation and transverse axis display reaches 1km and also will send earthquake prediction alarm.
The changing value of above-mentioned two parameters is referential parameters that the present invention provides, choosing of design parameter manually can adjust according to the composition of rock stratum is on the spot different with setting, as grouan strata structure will in strict accordance with the optimum configurations provided above, as Irish touchstone strata structure, parameter can suitably improve, just send earthquake prediction alarm as slope variation reaches 1%, variation range reaches 1.5km and just sends prediction alarm.Sedimentogeneous rock then can improve parameter more in this way.The larger then optimum configurations of the harder Young modulus in rock stratum is harsher in a word, and small deformation just reflection is stressed greatly, easily unexpected rock stratum cracking or displacement occur, otherwise the elasticity leeway of rock stratum is larger, more earthquake is less likely to occur.
(5) in addition, the vibration data that pendency Fibre Optical Sensor 8 is measured also adopts identical pattern to measure and analyzes, first reference curve data are recorded, then monitoring curve change, if find that the data that pendency Fibre Optical Sensor 8 feeds back and reference data have changed 0.5 more than %, or the vibrations change duration was more than 1 minute, or vibrations Parameters variation continues increase and namely sends alarm signal.
(6) data that described sensor group is beamed back all adopt same and that initial reference data is under normal circumstances compared mode.As the data that humidity sensor is passed back, if find that underground humidity increases, humidity recruitment exceedes 0.1% of original humidity, or continues to increase, and the time continued more than 2 days, then sends earthquake prediction alarm.Because the change of rock stratum humidity can change the mechanical characteristic of rock stratum, cause rock stratum aberrant cleavage or displacement, so want the stability problem of special concern subterranean strata humidity.
(7) all sensing datas all will adopt software united analysis and comparison, consider each sensing data factor, for improving alarm rate, adopt the independent alarm of single abnormal parameters, the comprehensive pattern analyzed.
Claims (6)
1. an earth-quake predictor underground probe, is characterized in that comprising the sensor group having flexible plastic packaging housing (4), upper cover (3), U-shaped Fibre Optical Sensor (5) and be arranged in sensor group housing (11);
Described U-shaped Fibre Optical Sensor (5) is made up of U-shaped wire rope (5-1) and the optical fiber be spirally wound on U wire rope (5-1);
Described pendency Fibre Optical Sensor comprises oil pipe (6) that the height being positioned at described plastic packaging housing (4) position, axis is more than 7km, be positioned at the pendency optical fiber (8) on described oil pipe (6) center line and lie in the weight (10) of pendency optical fiber (8) lower end; Reflecting surface (9) is provided with in the lower end of the pendency optical fiber (8) of the upper surface of weight (10);
Described sensor group housing (11) is positioned at the lower end of described plastic packaging housing (4); The signal wire (13) of described plastic packaging housing (4), U-shaped Fibre Optical Sensor (5), oil pipe (6), sensor group housing (11), sensor group and power lead (12) are by TPV material plastic packaging global formation;
Described sensor group comprises temperature sensor, humidity sensor, pressure transducer, electromagnetic sensor and acidity-basicity sensor.
2. earth-quake predictor underground according to claim 1 probe, the optical fiber be spirally wound on described in it is characterized in that on U-shaped wire rope (5-1) is a single-mode fiber (5-2).
3. earth-quake predictor underground according to claim 1 probe, the optical fiber be spirally wound on described in it is characterized in that on U-shaped wire rope (5-1) is 2 optical fiber, one is single-mode fiber (5-2), another root is multimode optical fiber (5-3), and described 2 optical fiber are alternate is spirally wound on described U-shaped wire rope (5-1).
4. earth-quake predictor underground according to claim 1 probe, it is characterized in that being full of transformer oil (7) in described oil pipe (6), the working temperature of described transformer oil (7) is-40-80 DEG C.
5. earth-quake predictor underground according to claim 1 probe, is characterized in that the intensity of described TPV material is at more than 70MPa.
6. earth-quake predictor underground according to claim 1 probe, is characterized in that the height of described plastic packaging housing (4) is more than 10km.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410630927.3A CN104407375A (en) | 2014-12-22 | 2014-12-22 | Underground probe of earthquake prediction instrument |
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| CN201410630927.3A CN104407375A (en) | 2014-12-22 | 2014-12-22 | Underground probe of earthquake prediction instrument |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105225425A (en) * | 2015-11-05 | 2016-01-06 | 泉州黄章智能科技有限公司 | A kind of optical fiber is used in the method and apparatus of earthquake alarm |
| CN105676276A (en) * | 2016-05-02 | 2016-06-15 | 漳浦县圆周率工业设计有限公司 | Analog-simulation optical fiber earthquake laser detection device |
| CN105717536A (en) * | 2016-05-02 | 2016-06-29 | 漳浦县圆周率工业设计有限公司 | Device for detecting underground distortion by multiple optical fibers |
| CN105807314A (en) * | 2016-05-02 | 2016-07-27 | 漳浦县圆周率工业设计有限公司 | Device and method for forewarning earthquake through laser device and optical fiber |
| CN113917108A (en) * | 2021-09-07 | 2022-01-11 | 三峡大学 | Model test device for simulating high and steep slope excavation unloading and displacement monitoring method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105225425A (en) * | 2015-11-05 | 2016-01-06 | 泉州黄章智能科技有限公司 | A kind of optical fiber is used in the method and apparatus of earthquake alarm |
| CN105676276A (en) * | 2016-05-02 | 2016-06-15 | 漳浦县圆周率工业设计有限公司 | Analog-simulation optical fiber earthquake laser detection device |
| CN105717536A (en) * | 2016-05-02 | 2016-06-29 | 漳浦县圆周率工业设计有限公司 | Device for detecting underground distortion by multiple optical fibers |
| CN105807314A (en) * | 2016-05-02 | 2016-07-27 | 漳浦县圆周率工业设计有限公司 | Device and method for forewarning earthquake through laser device and optical fiber |
| CN105717536B (en) * | 2016-05-02 | 2018-05-15 | 漳浦县圆周率工业设计有限公司 | A kind of device of multiple fiber laser arrays underground distortions |
| CN113917108A (en) * | 2021-09-07 | 2022-01-11 | 三峡大学 | Model test device for simulating high and steep slope excavation unloading and displacement monitoring method |
| CN113917108B (en) * | 2021-09-07 | 2024-03-12 | 三峡大学 | Model test device for simulating high-steep slope excavation unloading and displacement monitoring method |
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Application publication date: 20150311 |