CN104964639A - Device and method for detecting surrounding rock strain based on micro capacitance detection - Google Patents

Device and method for detecting surrounding rock strain based on micro capacitance detection Download PDF

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Publication number
CN104964639A
CN104964639A CN201510379126.9A CN201510379126A CN104964639A CN 104964639 A CN104964639 A CN 104964639A CN 201510379126 A CN201510379126 A CN 201510379126A CN 104964639 A CN104964639 A CN 104964639A
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China
Prior art keywords
crown
strain
electric capacity
capacitance
country rock
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CN201510379126.9A
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CN104964639B (en
Inventor
丁恩杰
陈卿
郎佳敏
吕雅洁
胡东平
顾靓雨
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China University of Mining and Technology CUMT
Xuzhou University of Technology
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China University of Mining and Technology CUMT
Xuzhou University of Technology
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Abstract

The invention provides a device and a method for detecting surrounding rock strain quickly and accurately in allusion to problem at present that borehole measurement surrounding rock strain sensor and a borehole are insufficient in coupling degree, the measurement direction is single, and the like. According to the method provided by the invention, a sensor is utilized to be well coupled to borehole surrounding rocks, the strain of the surrounding rocks can be measured in real time, and three-dimensional strain conditions can be measured at the same time. The test method has the advantages of simple and convenient installation and operation, accurate measurement and ability of monitoring in real time.

Description

A kind of country rock strain-Sensing device based on micro-capacitance detecting and method
Technical field
The present invention relates to a kind of pick-up unit and the method that are applicable to underground coal mine, especially a kind of country rock strain-Sensing device based on micro-capacitance detecting and method.
Background technology
Water bursting in mine is one of large dynamic disaster in colliery five, and the direct and indirect economic loss caused ranks colliery disaster and loses first place.Adopting surrouding rock stress is under subsurface excavation Activity Effects, and original terrestrial stress balance is broken, and the secondary stress after the redistribution of country rock space.Adopt after occurring, country rock space redistributes, and rock mass deforms.There is deformation in some rock mass possessing loose structure, cause the destruction of country rock under the effect of gravity, surrouding rock stress and underground water.Certain foundation can be provided for prediction water bursting disaster by detecting country rock strained situation.
In practical application, monitoring mine water inrush, ore deposit pressure are outstanding, the mode of terrestrial stress etc. generally adopts borehole test method, its ultimate principle is at measurement point construction drill, and drilling depth enters the place needing to measure, and sensor is goed deep into foot of hole and fixedly complete installation after hole wall contact.The Fundamentals of Sensors of borehole test comprise type vibration wire, flat jack formula and strain-type, all belong to rigid package body stress meter.
These sensors have a common shortcoming above, and that is exactly that the degree of coupling of sensor and the wall of a borehole determines the order of accuarcy of measurement.Under normal circumstances, drilling construction completes puts into the sensor initial stage, and boring surrounding rock body keeps complete, and be not subjected to displacement or deformation, now, sensor and the wall of a borehole can not good contacts.Only have when boring surrounding rock body, under the effect of gravity, surrouding rock stress, underground water etc., deformation, movement occurs, even break, after rock mass and sensor contact completely, sensor could measure stress value more accurately.In addition, these sensors can only detect the stress on single direction, can not measure triaxiality situation.
Therefore, be necessary to work out a kind of device and method that accurately can detect country rock strain, thus solve the problems referred to above in the middle of prior art.
Summary of the invention
The object of the invention is, for current borehole survey surrouding rock stress sensor and the problems such as the degree of coupling is inadequate, direction of measurement is single of holing, to provide one country rock strain-Sensing device and method fast and accurately.The method utilizes sensor to carry out good coupling with boring country rock, can measure in real time, measure three dimensional strain situation simultaneously to country rock strain.The advantage of this method of testing to be installed and simple to operate, convenient, measures accurately, can monitor in real time.
A kind of country rock strain-Sensing device based on micro-capacitance detecting of request protection of the present invention, this device comprises strain transducer, capacitive detection module, data processing module, wherein:
Strain transducer comprises top crown, carrier, intermediate medium, bottom crown;
Bottom crown and top crown just to and area equation, top crown is an entirety, and bottom crown is divided into n part; Upper and lower pole plate is screwed on carrier, fits completely with cylindrical vector; Carrier is the cylindrical of hollow, forms by having better material that is flexible and that have a good crushing resistance; Intermediate medium injects strain transducer by forcing pump, and wherein, intermediate medium has larger relative dielectric constant; Top crown, carrier, intermediate medium, bottom crown form n electric capacity pair.
Capacitive detection module, comprises capacitance detecting chip and peripheral circuit, for detecting and calculating the right capacitance of electric capacity, and sends to data processing module;
Wherein, the capacitance computing formula that electric capacity is right is
C = ϵ S d
Wherein, ε is the specific inductive capacity of medium between capacitor plate; D represents two parallel plate electrode spacings; S represents two parallel plate electrode relative areas;
As can be seen from formula, output capacitance and the polar plate spacing of plane-parallel capacitor are inversely proportional to, and are directly proportional to right opposite between pole plate is long-pending;
Data processing module, for feeding back country rock strained situation according to capacitance.
Wherein, the detailed process of feedback country rock strained situation is: n the electric capacity formed top crown and bottom crown is to combining, measure its combination capacitor changing value, draw the equation that multiple electric capacity and displacement, right opposite amass, drawn the three-dimensional coordinate of top crown by solving equation group, thus draw three dimensional strain situation.
The present invention also asks to protect a kind of country rock strain detecting method based on micro-capacitance detecting be applied in above-mentioned pick-up unit, comprises the steps:
S101, adopting in the rock mass of space a measurement boring of constructing, puts into strain transducer wherein;
S102, strain transducer Bonding pressure pump, forcing pump injects intermediate medium in strain transducer, when sensor be expanded to the wall of a borehole good coupling after, stop inject, unload forcing pump;
S103, opens strain transducer, starts to detect country rock strained situation.When strain occurs in country rock inside, be applied on strain transducer, cause the capacitance variation that the electric capacity on sensor is right, detect by capacitive detection module the electric capacity changes values that electric capacity is right, row relax of going forward side by side, draws country rock strained situation.
S104, after test terminates, stopping device power supply, opens the intermediate medium that valve bleeds off sensor internal, from boring, take out strain transducer.
Beneficial effect of the present invention is:
Based on the country rock strain-Sensing device of micro-capacitance detecting and method achieve country rock strain is carried out in real time, various dimensions measure.The present invention is compared with existing country rock strain testing technology: simple to operate, sensor and wall rock drill-hole coupling good, can continuous coverage three dimensional strain carry out timely collection, boring country rock strained situation can be reflected, for geologic hazard such as underground coal mine prediction gushing water, ore deposit shake etc. provides important evidence.
Accompanying drawing explanation
Fig. 1 is the structural representation of country rock strain-Sensing device of the present invention;
Fig. 2 is the structural representation of strain transducer in device of the present invention;
Fig. 3 is the vertical view of middle strain transducer in device of the present invention;
Fig. 4 is the schematic diagram that sensor puts in boring;
Fig. 5 is sensor and the schematic diagram of fitting of holing;
Bottom crown numbering schematic diagram when Fig. 6 is n=12.
Embodiment
Below by specific embodiment, the invention will be further described, and following examples are descriptive, is not determinate, can not limit protection scope of the present invention with this.
Know-why: the computing formula of plane-parallel capacitor electric capacity is
C = ϵ S d
Wherein, ε is the specific inductive capacity of medium between capacitor plate; D represents two parallel plate electrode spacings; S represents two parallel plate electrode relative areas.
As can be seen from formula, output capacitance and the polar plate spacing of plane-parallel capacitor are inversely proportional to, and are directly proportional, namely when a positive pressure is on plane-parallel capacitor to right opposite between pole plate is long-pending, plane-parallel capacitor polar plate spacing, from changing, causes output capacitance to change; When a shearing force is carried on plane-parallel capacitor, pole plate right opposite is long-pending to change, and causes output capacitance to change.
Namely the present invention utilizes this feature of plane-parallel capacitor, selects suitable material as intermediate medium, invents a kind of country rock strain-Sensing device based on micro-capacitance detecting.When country rock of holing deforms, effect of stress on pole plate, cause polar plate spacing from or pole plate right opposite is long-pending changes, sensor being furnished with much electric capacity pair, by measuring the right capacitance variation of electric capacity, and then being finally inversed by boring country rock strained situation.
Below by way of Fig. 1-3, the country rock strain-Sensing device based on micro-capacitance detecting of the present invention is further introduced.
The invention provides a kind of country rock strain-Sensing device 100 based on micro-capacitance detecting, this device comprises strain transducer 101, capacitive detection module 102, data processing module 103, wherein:
Strain transducer 101 comprises top crown 1001, carrier 1004, intermediate medium 1005, bottom crown 1002;
Bottom crown 1002 and top crown 1001 just to and area equation, top crown 1001 is an entirety, and bottom crown 1002 is divided into n part; Upper and lower pole plate screw 1003 is fixed on carrier 1004, fits completely with cylindrical vector; Carrier 1004 is the cylindrical of hollow, forms by having better material that is flexible and that have a good crushing resistance; Intermediate medium 1005 injects strain transducer 101 by forcing pump, and wherein, intermediate medium has larger relative dielectric constant.Top crown 1001, carrier 1004, intermediate medium 1005, bottom crown 1002 form n electric capacity pair.
Capacitive detection module 102, comprises capacitance detecting chip and peripheral circuit, for detecting and calculating the right capacitance of electric capacity, and sends to data processing module 103;
Wherein, the capacitance computing formula that electric capacity is right is
C = ϵ S d
Wherein, ε is the specific inductive capacity of medium between capacitor plate; D represents two parallel plate electrode spacings; S represents two parallel plate electrode relative areas.
As can be seen from formula, output capacitance and the polar plate spacing of plane-parallel capacitor are inversely proportional to, and are directly proportional, namely when a positive pressure is on plane-parallel capacitor to right opposite between pole plate is long-pending, plane-parallel capacitor polar plate spacing, from changing, causes output capacitance to change; When a shearing force is carried on plane-parallel capacitor, pole plate right opposite is long-pending to change, and causes output capacitance to change.
Data processing module 103, for feeding back country rock strained situation according to capacitance.
Wherein, the detailed process of feedback country rock strained situation is: n the electric capacity formed top crown and bottom crown is to combining, measure its combination capacitor changing value, draw the equation that multiple electric capacity and displacement, right opposite amass, drawn the three-dimensional coordinate of top crown by solving equation group, thus draw three dimensional strain situation.
Be illustrated measuring the step that combination capacitor calculates three dimensional strain below:
Get n=12, bottom crown n part forms n electric capacity pair with top crown, is numbered as shown in Figure 6 bottom crown n part.
(1) combine:
1. 2 electric capacity taking off pole plate adjacent from n electric capacity centering combine, and such as combine 1,2,1,5 combine;
2. 4 electric capacity taking off pole plate adjacent from n electric capacity centering combine, and such as 1,2,5,6 combine, and 2,3,6,7 combine;
3. 6 electric capacity taking off pole plate adjacent from n electric capacity centering combine, and such as 1,2,3,5,6,7 combine;
4. 9 electric capacity taking off pole plate adjacent from n electric capacity centering combine, and such as 1,2,3,5,6,7,9,10,11 combine.
(2) measure:
1. the capacitance of n electric capacity between upper bottom crown is measured;
2. the capacitance of combination capacitor is measured;
(3) delete choosing:
Choosing is deleted to the capacitance measured, selects the capacitance in the range ability of metering circuit to carry out subsequent calculations;
(4) calculate:
Establishing an equation to deleting the capacitance selected, drawing and solving the system of equations that electric capacity and displacement, right opposite amass optimum solution and draw three-dimensional country rock strained situation.
The application also asks to protect a kind of country rock strain detecting method based on micro-capacitance detecting be applied in country rock strain-Sensing device as above, comprises the steps:
S101, adopting in the rock mass of space a measurement boring of constructing, puts into strain transducer wherein, as shown in Figure 4;
S102, strain transducer Bonding pressure pump, forcing pump injects intermediate medium in strain transducer, when sensor be expanded to the wall of a borehole good coupling after, stop inject, unload forcing pump, as shown in Figure 5;
S103, opens strain transducer, starts to detect country rock strained situation.When strain occurs in country rock inside, be applied on strain transducer, cause the capacitance variation that the electric capacity on sensor is right, detect by capacitive detection module the electric capacity changes values that electric capacity is right, row relax of going forward side by side, draws country rock strained situation.
S104, after test terminates, stopping device power supply, opens the intermediate medium that valve bleeds off sensor internal, from boring, take out strain transducer.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.

Claims (2)

1., based on a country rock strain-Sensing device for micro-capacitance detecting, this device comprises strain transducer, capacitive detection module, data processing module, wherein:
Strain transducer comprises top crown, carrier, intermediate medium, bottom crown;
Bottom crown and top crown just to and area equation, top crown is an entirety, and bottom crown is divided into n part; Upper and lower pole plate is screwed on carrier, fits completely with cylindrical vector; Carrier is the cylindrical of hollow, forms by having better material that is flexible and that have a good crushing resistance; Intermediate medium injects strain transducer by forcing pump, and wherein, intermediate medium has larger relative dielectric constant; Top crown, carrier, intermediate medium, bottom crown form n electric capacity pair.
Capacitive detection module, comprises capacitance detecting chip and peripheral circuit, for detecting and calculating the right capacitance of electric capacity, and sends to data processing module;
Wherein, the capacitance computing formula that electric capacity is right is
C = ϵ S d
Wherein, ε is the specific inductive capacity of medium between capacitor plate; D represents two parallel plate electrode spacings; S represents two parallel plate electrode relative areas;
As can be seen from formula, output capacitance and the polar plate spacing of plane-parallel capacitor are inversely proportional to, and are directly proportional to right opposite between pole plate is long-pending;
Data processing module, for feeding back country rock strained situation according to capacitance.
Wherein, the detailed process of feedback country rock strained situation is: n the electric capacity formed top crown and bottom crown is to combining, measure its combination capacitor changing value, draw the equation that multiple electric capacity and displacement, right opposite amass, drawn the three-dimensional coordinate of top crown by solving equation group, thus draw three dimensional strain situation.
2. be applied to the country rock strain detecting method based on micro-capacitance detecting in pick-up unit as claimed in claim 1, it is characterized in that comprising the steps:
S101, adopting in the rock mass of space a measurement boring of constructing, puts into strain transducer wherein;
S102, strain transducer Bonding pressure pump, forcing pump injects intermediate medium in strain transducer, when sensor be expanded to the wall of a borehole good coupling after, stop inject, unload forcing pump;
S103, opens strain transducer, starts to detect country rock strained situation.When strain occurs in country rock inside, be applied on strain transducer, cause the capacitance variation that the electric capacity on sensor is right, detect by capacitive detection module the electric capacity changes values that electric capacity is right, row relax of going forward side by side, draws country rock strained situation.
S104, after test terminates, stopping device power supply, opens the intermediate medium that valve bleeds off sensor internal, from boring, take out strain transducer.
CN201510379126.9A 2015-07-01 2015-07-01 A kind of country rock strain-Sensing device and method based on micro- capacitance detecting Expired - Fee Related CN104964639B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105699787A (en) * 2016-03-04 2016-06-22 中国矿业大学 Coal rock dielectric constant measure method based on impedance analyzer
CN105783696A (en) * 2016-04-25 2016-07-20 天津大学 Strain sensor based on flexible capacitor and manufacturing and test method thereof
CN108801342A (en) * 2018-05-08 2018-11-13 中山大学 A kind of embedded Multi-parameter sensing measuring equipment

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CN104236446A (en) * 2014-05-08 2014-12-24 珠海市泰德企业有限公司 Drilling multi-component strain measurement head
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CN1200804A (en) * 1995-10-23 1998-12-02 华盛顿卡内基研究所 Strain monitoring system
US20050234648A1 (en) * 2002-02-08 2005-10-20 University Of Houston Method for stress and stability related measurements in boreholes
CN2676143Y (en) * 2003-11-10 2005-02-02 池顺良 Multi component isoplanar radial displacement type boring strain gauge
DE102005047659A1 (en) * 2005-10-05 2007-04-12 Jäger, Frank-Michael Strain measuring device e.g. for mountains, has ultrasonic sensors provided in boreholes and measurement of ultrasonic parameters does not directly take place in mountains but in borehole probes which record strain
CN101435747A (en) * 2008-12-10 2009-05-20 大连理工大学 Design method of multi-direction coupling slit gauge based on strain dynamic measurement
CN201964871U (en) * 2011-03-01 2011-09-07 欧阳祖熙 Capacitive displacement sensor and component-type borehole strain meter adopting same
CN202083345U (en) * 2011-03-01 2011-12-21 欧阳祖熙 Displacement sensing device for borehole strain meter
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105699787A (en) * 2016-03-04 2016-06-22 中国矿业大学 Coal rock dielectric constant measure method based on impedance analyzer
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CN105783696A (en) * 2016-04-25 2016-07-20 天津大学 Strain sensor based on flexible capacitor and manufacturing and test method thereof
CN108801342A (en) * 2018-05-08 2018-11-13 中山大学 A kind of embedded Multi-parameter sensing measuring equipment

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