CN110685670A - Intelligent strain type drilling clinometer and measuring method - Google Patents

Intelligent strain type drilling clinometer and measuring method Download PDF

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Publication number
CN110685670A
CN110685670A CN201910853977.0A CN201910853977A CN110685670A CN 110685670 A CN110685670 A CN 110685670A CN 201910853977 A CN201910853977 A CN 201910853977A CN 110685670 A CN110685670 A CN 110685670A
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China
Prior art keywords
strain
rod
inclinometer
unit
displacement
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Inventor
严亮轩
李德营
孙一清
方晓那
唐颂柯
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China University of Geosciences
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China University of Geosciences
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/02Determining slope or direction
    • E21B47/022Determining slope or direction of the borehole, e.g. using geomagnetism
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06QINFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/02Agriculture; Fishing; Mining

Abstract

The invention provides an intelligent strain type drilling inclinometer which comprises an inclinometer outer pipe, a plurality of force transmission sheets, a strain rod and a detection circuit, wherein two ends of the inclinometer outer pipe are sealed, all the force transmission sheets are arranged inside the inclinometer outer pipe and are distributed at intervals along the axial direction to divide the inclinometer outer pipe into a plurality of strain units, the strain rod is arranged on the axial line of the inclinometer outer pipe and penetrates through and is fixedly connected to all the force transmission sheets, four resistance type strain sheets are arranged in each strain unit, the four strain sheets are fixed on the outer wall of the strain rod and are uniformly distributed around the outer wall of the strain rod, the detection circuit is respectively connected with the four strain sheets of each strain unit, and the detection circuit is used for acquiring electric signals through the four strain sheets of each strain unit and calculating the displacement corresponding to a landslide section corresponding to each strain unit according to the. The invention has the beneficial effects that: the time interval of data acquisition can be adjusted, real-time data of deep displacement of the landslide is obtained, and the obtained monitoring data of deep displacement of the landslide body are continuous in space.

Description

Intelligent strain type drilling clinometer and measuring method
Technical Field
The invention relates to the technical field of geological disaster monitoring, in particular to an intelligent strain type drilling clinometer and a measuring method.
Background
The geological disaster monitoring is an important means for acquiring the change and development of the geological disaster and is an important component of the geological disaster prediction. Deep displacement monitoring is one of core contents of geological disaster monitoring, and is a main means for investigating the deformation change characteristics of substances in a landslide body under the action of self gravity and external force. Deep displacement monitoring is an important method for analyzing the position of a landslide zone, a landslide deformation mechanism and motion characteristics, and plays a key role in the success of geological disaster prediction.
The method is that a plurality of monitoring point positions are arranged on the landslide, a drilling machine is used for drilling through a sliding body until a certain depth is reached in a sliding bed, and an inclinometer with a guide groove is arranged in a drill hole. When the displacement of the deep part of the landslide is monitored, the inclinometer is arranged at the bottom end of the drill hole and gradually moves to the top end from the bottom end of the drill hole along the guide groove, the information of the spatial angle change of the inclinometer is obtained, and the displacement of the rock and soil mass at different parts of the deep part of the landslide body is obtained.
The conventional borehole inclinometer has the following problems that the ① inclinometer collects angle change data not at full depth in an inclinometer but at a set unit distance, the data of an angle sensor is collected, therefore, the large error exists in the deformation of a section of borehole estimated according to the data collected at one point in space, the data collection of the ② inclinometer is discontinuous in time, and as the deformation of a plurality of landslides is slow, in engineering practice, periodic monitoring is mostly adopted, namely, monitoring is carried out at intervals, and continuous landslide deformation data are difficult to obtain.
Disclosure of Invention
In view of the above, embodiments of the present invention provide an intelligent strain-type borehole inclinometer and a measurement method.
The embodiment of the invention provides an intelligent strain type drilling inclinometer, which comprises an inclinometer outer tube, a plurality of force transmission sheets, a strain rod and a detection circuit, wherein two ends of the inclinometer outer tube are sealed, the force transmission sheets are annular, all the force transmission sheets are arranged in the inclinometer outer tube, the side wall of each force transmission sheet is attached to and fixedly connected with the inner wall of the inclinometer outer tube, all the force transmission sheets are distributed at intervals along the axial direction to divide the inclinometer outer tube into a plurality of strain units, the strain rod is arranged on the axial line of the inclinometer outer tube and penetrates through and is fixedly connected with all the force transmission sheets, four resistance type strain sheets are arranged in each strain unit, the four strain sheets are fixed on the outer wall of the strain rod and are uniformly distributed around the outer wall of the strain rod, all the strain sheets on the strain rod are arranged into four bus bars of the strain rod, and the detection circuit is respectively connected with the four strain sheets of each strain unit, the detection circuit is used for acquiring electric signals from the four strain gauges of each strain unit and calculating displacement corresponding to the landslide section corresponding to each strain unit according to the electric signals.
Furthermore, four reinforcing ribs which are distributed in a cross shape are arranged on the surface of each force transmission piece.
Furthermore, all the force transmission sheets are uniformly distributed along the axial direction of the inclinometer outer tube, and the axial distance between the strain sheets of two adjacent strain units is equal to the length of the strain unit.
Further, each of the strain units has a length of 1 m.
The embodiment of the invention also provides a strain type drill hole inclination measuring method, which uses the intelligent strain type drill hole inclination meter and comprises the following steps:
s1, pre-judging the main sliding direction of the landslide, arranging the inclination measuring outer pipe in a drill hole on the landslide, and arranging two strain gauges opposite to the strain unit along the pre-judging main sliding direction;
s2, the landslide slides to bend the inclinometer outer tube, the strain rods and the inclinometer outer tube are synchronously bent, and four strain plates in each strain unit are deformed to generate electric signals;
s3 calculating the micro strain of each strain gauge from the relationship between resistance and strain, and measuring the inclination of the outer tubeThe strain unit(s) of (1) is numbered at the lowest part, the strain units are sequentially increased upwards, the direction of the strain sheet of the strain unit i along the main sliding direction is defined as the direction of x +, and the generated microstrain is epsilonx+iI is 1,2,3, … …, the direction of the strain gage opposite to the main slip direction is defined as the x-direction, and the micro strain generated is epsilonx-iHas an epsilonx+ix-iWhen the direction of the strain gauge rotating 90 degrees along the main sliding direction and anticlockwise is defined as y + direction, the generated micro strain is epsilony+iDefining the direction of the strain gage rotating 90 DEG clockwise along the principal slip direction as the y-direction, the microstrain generated by the strain gage is epsilony-iHas an epsilony+iy-i=0;
S4 calculating the displacement of each strain element according to the geometric relationship, specifically:
the x direction:
Figure BDA0002197753770000031
the y direction:
resultant displacement:
in the formula:
theta is a central angle corresponding to the bent strain rod of the strain unit;
r is the radius of the cross section of the strain rod;
l is the original length of the strain rod of the strain unit;
Δxihorizontal displacement in the x + direction at the upper end point of a strain rod of the strain unit;
Δyihorizontal displacement in the y + direction at the upper end point of the strain rod of the strain unit;
Δithe horizontal displacement is the sum of the x + direction and the y + direction at the upper end point of the strain rod of the strain unit;
further, S5, calculating the displacement of the strain rod, as follows,
cumulative horizontal displacement in the x direction:
Figure BDA0002197753770000034
cumulative horizontal displacement in the y-direction:
Figure BDA0002197753770000041
cumulative resultant horizontal displacement
Figure BDA0002197753770000042
In the formula:
n is the number of the strain units;
Δxaccumulating the displacement for the x direction;
Δyaccumulating the displacement for the y direction;
and delta is the accumulated total displacement of the strain rod on the horizontal plane.
Further, S6 is included, the included angle between the micro strain in the x + direction of the strain unit i and the actual main sliding direction of the landslide is set as alphaiThen, then
Figure BDA0002197753770000043
Figure BDA0002197753770000044
The degree to which the actual main direction of landslide is offset from the x + direction can be calculated by:
Figure BDA0002197753770000045
Figure BDA0002197753770000047
Figure BDA0002197753770000051
in the formula:
Rithe radius of curvature of the strain rod of the variable unit i after bending;
θiis the central angle corresponding to the bending section of the strain rod of the variable unit i.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
①, the time interval of data acquisition can be automatically adjusted according to the requirement of monitoring precision, and real-time data of deep displacement of landslide can be obtained;
② because the strain rod is a rigid rod, the deformation of the strain rod can be calculated according to the material mechanics characteristics of the strain rod, so that the obtained displacement monitoring data of the deep part of the slip mass is continuous in space;
③ the measuring range of the displacement monitoring of the deep part of the landslide is larger than that of the existing drilling inclinometer;
④, a landslide deformation early warning threshold value can be preset, when the landslide deformation reaches the threshold value, landslide early warning is triggered intelligently, and early warning information is provided for personnel in decision departments and landslide influence ranges;
⑤ adopts automatic and intelligent electronic monitoring equipment, reduces the workload of personnel, and improves the early warning efficiency.
Drawings
FIG. 1 is a schematic structural view of an intelligent strain gage inclinometer according to the present invention;
FIG. 2 is a schematic structural diagram of the force-transmitting plate of FIG. 1;
FIG. 3 is a schematic view of the bending of a strain gage;
FIG. 4 is a schematic diagram of the calculation principle of the displacement of the bending section of the strain rod;
FIG. 5 is a schematic diagram of the calculation of the angle between the x + direction and the actual main slip direction.
In the figure: the device comprises a 1-inclinometer outer tube, a 2-end cover, a 3-dowel piece, a 4-strain rod, a 5-strain piece, a 6-reinforcing rib and a 7-strain unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides an intelligent strain-type borehole inclinometer, which includes an inclinometer outer tube 1, a plurality of force transmitting plates 3, a strain rod 4, and a detection circuit.
Referring to fig. 2, the inclinometer outer tube 1 is a cylindrical tube, both ends of which are open and provided with end caps 2, and the two end caps 2 respectively seal both ends of the inclinometer outer tube 1. The length of the inclinometer outer pipe 1 is consistent with the depth of a drilled hole, and the inclinometer outer pipe 1 can bear certain bending moment and shearing force without being damaged. The dowel piece 3 is circular, wherein the dowel piece 3 is circular, the outer diameter of the dowel piece is equal to the inner diameter of the inclinometer outer pipe 1, and the inner diameter of the dowel piece is equal to the diameter of the strain rod 4. Four reinforcing ribs 6 are arranged on the surface of the force transmission piece 3, and the reinforcing ribs 6 surround the inner holes of the force transmission piece 3 and are uniformly arranged to form a cross shape.
All power transmission pieces 3 set up in 1 inside and each of deviational survey outer tube 3 lateral walls with 1 inner wall laminating and fixed connection of deviational survey outer tube, all power transmission pieces 3 along axial interval distribution will 1 interval of deviational survey outer tube becomes a plurality of strain units 7, all power transmission pieces 3 along 1 axial evenly distributed of deviational survey outer tube makes each the length of strain unit 7 is the same.
Strain gauge 4 set up in on the 1 axis of deviational survey outer tube, run through and all dowel steel 3's of fixed connection hole, each be equipped with four resistance-type foil gages 5 in the strain unit 7, four foil gage 5 is fixed in through bonding 4 outer walls of strain gauge, and four foil gage 5 encircles 4 outer walls evenly distributed of strain gauge, quartering the 4 circumference of strain gauge, four in this embodiment strain gauge 5 set up in 7 middle parts of strain unit on the strain gauge, adjacent two like this axial distance between strain gauge 5 of strain unit 7 equals the length of strain unit 7, in engineering practice strain unit 7 length generally is 1 m. All the strain gauges 5 on the strain rod 4 are arranged into four generatrices of the strain rod 4, that is, four strain gauges 5 of any one strain unit 7 are axially aligned with four strain gauges 5 of the adjacent strain unit 7 one by one and are located on the same straight line.
In the embodiment, the strain rod 4 is made of high-quality alloy aluminum materials, has high yield strength, ensures the measuring range of the inclinometer, and reduces the influence of the self rod weight on the strain of the rod; the strain rod 4 is good in elasticity, the elastic modulus of each part is consistent, and the deformation can be accurately calculated when elastic deformation occurs.
The detection circuit is respectively connected with the four strain gauges 5 of each strain unit 7, the inclinometer outer tube 1 is subjected to bending deformation under the influence of landslide deformation acting force, the strain rods 4 are forced to be subjected to synchronous bending deformation, the strain gauges 5 are deformed to generate electric signals, the detection circuit detects the electric signals generated by the four strain gauges 5 of each strain unit 5, and the displacement corresponding to the landslide section corresponding to each strain unit 7 is calculated according to the electric signals.
The embodiment of the invention also provides a strain type drill hole inclination measuring method, which uses the intelligent strain type drill hole inclination meter and comprises the following steps:
s1, pre-judging the main slip direction of the landslide according to the geological conditions of landslide engineering, arranging the inclinometer outer tube 1 in a drill hole on the landslide, and arranging two strain gages 5 corresponding to the strain unit 7 along the pre-judging main slip direction, so that the other two strain gages 5 of the strain unit 7 are positioned in the vertical direction of the pre-judging main slip direction; filling fine sand between the inclinometer outer pipe 1 and the hole wall, and compacting the fine sand;
s2, when the slope slides, the slope slides to bend the inclinometer outer tube 1, the force transmission piece 3 transmits the stress to the strain rod 4, the strain rod 4 bends synchronously with the inclinometer outer tube 1 under the stress, so that the strain pieces 5 deform, and four strain pieces 5 in each strain unit 7 deform to generate electric signals;
s3, the detection circuit calculates the micro-strain of each strain gauge 5 according to the relation between resistance and strain, numbers the strain units 7 of the inclinometer outer tube 1, the number of the strain unit 7 at the lowest part is 1, the strain units are sequentially increased upwards, the direction of the strain gauge 5 of the strain unit i along the main sliding direction is defined as the x + direction, and the generated micro-strain epsilon isx+iI is 1,2,3, … …, and the direction of the strain gage 5 opposite to the main slip direction is defined as the x-direction, and the micro strain generated by the direction is epsilonx-iHas an epsilonx+ix-iWhen the direction of the strain gauge rotated by 90 degrees along the main sliding direction is defined as y + direction, the micro strain generated by the strain gauge is epsilony+iDefining the direction of the strain gage rotating 90 DEG clockwise along the principal slip direction as the y-direction, the microstrain generated by the strain gage is epsilony-iHas an epsilony+iy-i=0;
When the landslide is deformed, the strain rod 4 is subjected to bending deformation under the influence of the landslide deformation acting force, one side of the strain rod 4, which is back to the main sliding direction, is pulled, the surface of the rod body is extended, and the strain value measured by each strain gauge is the ratio of the extension amount of the strain rod 4 to the original length. The strain rod 4 is bent under the action of the landslide, and is subjected to compression deformation along one side of the landslide displacement direction and tensile deformation along the other side of the landslide displacement direction. The displacement value fed back by the strain gauge 5 is represented by two positive values, two negative values, or one positive value, one negative value and two zero values.
Since the strain rod 4 is an elastic rod, the deformation of the two strain gauges 5 is the same, i.e. epsilonx+iAnd epsilonx-iSame value of epsilonx-iIs pulled by a positive value, epsilonx+iThe pressure is negative; epsilony+iAnd epsilony-iThe same value, a positive one negative, or epsilony+i=εy+i0, but εy+iAnd epsilony-iThe positive and negative x + directions of (a) are related to the main slip direction offset angle.
S3 calculates the displacement of each strain element 7 according to the geometric relationship, specifically:
referring to fig. 3, the bending deformation of the strain rod 4 is first analyzed, and for a bending section of the strain rod 4, the geometric relationship is obtained
Figure BDA0002197753770000081
Figure BDA0002197753770000082
Figure BDA0002197753770000083
In the formula:
epsilon is the strain measured by the strain gage 5;
r is the radius of curvature (m) of the strain rod 4 after bending;
theta is a central angle (°) corresponding to the bending section of the strain rod 4;
r is the radius (m) of the section of the strain rod 4;
l is the original length (m) of the bent section of the strain rod 4.
Referring to fig. 4, the displacement of the strain rod 4 at the end of the bending section can be further calculated as:
Figure BDA0002197753770000084
in the formula:
d Δ is the horizontal displacement (m) at the end of one bending section of the strain rod 4.
The spatial displacement of the drill hole where the inclinometer is located can be obtained by integrating each displacement, and the formula is as follows:
Figure BDA0002197753770000091
in the formula:
Δ is the cumulative horizontal displacement (m) of the strain rod 4.
The bending deformation of each strain gauge in the strain unit is the same as the bending deformation of the bending section of the strain rod, so the displacement of each strain gauge is as follows:
the x direction:
Figure BDA0002197753770000092
the y direction:
Figure BDA0002197753770000093
resultant displacement:
Figure BDA0002197753770000094
in the formula:
theta is a central angle (°) corresponding to the bent strain rod 4 in the strain unit 7;
r is the cross-sectional radius (m) of the strain rod;
l is the length (m) of the strain rod 4 within the strain cell 7.
ΔxiIs the x + direction horizontal displacement (m) at the upper end point of the strain rod 4 within the strain cell 7.
ΔyiIs the y + direction horizontal displacement (m) at the upper end point of the strain rod 4 within the strain cell 7.
ΔiThe x + direction and the y + direction are combined to be horizontally displaced (m) at the upper end point of the strain rod 4 in the strain unit 7.
S4, calculating the overall displacement of the strain rod 4, as follows,
cumulative horizontal displacement in the x direction:
Figure BDA0002197753770000101
cumulative horizontal displacement in the y-direction:
Figure BDA0002197753770000102
cumulative resultant horizontal displacement
Figure BDA0002197753770000103
In the formula:
n is the number of the strain units 7;
Δxaccumulating the displacement (m) for the x-direction;
Δyaccumulating the displacements (m) for the y-direction;
Δ is the cumulative total displacement (m) of the strain rod 4 on the horizontal plane.
The strain rod 4 bends under the action of landslide, and is compressed and deformed along one side of the displacement direction of the landslide and stretched and deformed along one side of the displacement direction of the landslide. Expressed in the value of the displacement fed back by the strain gauge 5, and is epsilon for the micro strain in the x directionx+i<0,εx-i> 0, and the following are the cases for y-direction microstrain.
When the x + direction strain gauge 5 is consistent with the main landslide direction of the landslide, the y direction micro-strain is epsilony+i=εy-iWhen the main sliding direction is 0, the x + direction is the main sliding direction.
When the x + direction strain gauge 5 is offset from the main sliding direction of the landslide, if the main sliding direction is between the x + direction and the y + direction, the y direction micro-strain is epsilony+i<0<εy-i(ii) a If the dominant slip direction is between the x + direction and the y-direction, then the y-direction microstrains to εy-i<0<εy+i
S6, please refer to FIG. 5, wherein the included angle between the micro strain in the x + direction of the strain unit i and the actual main sliding direction of the landslide is set as αi(with the x + direction as the reference direction, the main sliding direction is positive when rotating clockwise, and negative when rotating counterclockwise), then
Figure BDA0002197753770000111
Figure BDA0002197753770000112
The degree to which the actual main direction of landslide is offset from the x + direction can be calculated by:
Figure BDA0002197753770000113
Figure BDA0002197753770000114
Figure BDA0002197753770000115
in the formula:
Riradius of curvature (m) of the strain rod 4 in the strain unit i after bending;
θiis the central angle (°) corresponding to the bending section of the strain rod 4 in the strain unit i.
The intelligent strain type drilling inclinometer in the embodiment of the invention can also be provided with a computer, the detection circuit is connected with the computer, an electric signal detected by the detection circuit is input into the computer, and the computer obtains the deformation condition of the sliding mass through calculation and displays the deformation condition through a human-computer interaction interface; and when the deformation value reaches a set deformation threshold value, giving out an early warning.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. The utility model provides an intelligence strain type drilling clinometer which characterized in that: the device comprises an inclinometer outer pipe, a plurality of force transmission sheets, a strain rod and a detection circuit, wherein two ends of the inclinometer outer pipe are sealed, the force transmission sheets are circular, all the force transmission sheets are arranged in the inclinometer outer pipe, the side walls of all the force transmission sheets are attached to the inner wall of the inclinometer outer pipe and fixedly connected with the inner wall of the inclinometer outer pipe, all the force transmission sheets are distributed along the axial direction at intervals to divide the inclinometer outer pipe into a plurality of strain units, the strain rod is arranged on the axis of the inclinometer outer pipe and penetrates through and is fixedly connected with all the force transmission sheets, a four-resistor type strain sheet is arranged in each strain unit, the four strain sheets are fixed on the outer wall of the strain rod and are uniformly distributed around the outer wall of the strain rod, all the strain sheets on the strain rod are arranged into four buses of the strain rod, the detection circuit is respectively connected with the four strain sheets of each strain unit, and the detection circuit is used for, and calculating the displacement corresponding to the landslide section corresponding to each strain unit according to the electric signals.
2. The intelligent strain gage drill tilt gauge according to claim 1, wherein: four reinforcing ribs which are distributed in a cross shape are arranged on the surface of each force transmission piece.
3. The intelligent strain gage drill tilt gauge according to claim 1, wherein: all the force transmission pieces are axially and uniformly distributed along the inclinometer outer tube, and the axial distance between the strain pieces of two adjacent strain units is equal to the length of each strain unit.
4. The intelligent strain gage drill tilt gauge according to claim 1, wherein: each of the strain cells has a length of 1 m.
5. A strain type drill hole inclination measuring method is characterized in that: use of an intelligent strain gage borehole tiltmeter as claimed in claim 1, and comprising the steps of:
s1, pre-judging the main sliding direction of the landslide, arranging the inclination measuring outer pipe in a drill hole on the landslide, and arranging two strain gauges opposite to the strain unit along the pre-judging main sliding direction;
s2, the landslide slides to bend the inclinometer outer tube, the strain rods and the inclinometer outer tube are synchronously bent, and four strain plates in each strain unit are deformed to generate electric signals;
s3, the detection circuit calculates the micro-strain of each strain gauge according to the relation between resistance and strain, the strain units of the inclinometer outer tube are numbered, the number of the lowest strain unit is 1, the strain units are sequentially increased upwards, the direction of the strain gauge of the strain unit i along the main sliding direction is defined as the x + direction, and the generated micro-strain is epsilonx+iI is 1,2,3, … …, the direction of the strain gage opposite to the main slip direction is defined as the x-direction, and the micro strain generated is epsilonx-iHas an epsilonx+ix-iWhen the direction of the strain gauge rotated by 90 degrees along the main sliding direction is defined as y + direction, the micro strain generated by the strain gauge is epsilony+iDefining the direction of the strain gage rotating 90 DEG clockwise along the principal slip direction as the y-direction, the microstrain generated by the strain gage is epsilony-iHas an epsilony+iy-i=0;
S4 calculating the displacement of each strain element according to the geometric relationship, specifically:
the x direction:
Figure FDA0002197753760000021
the y direction:
Figure FDA0002197753760000022
resultant displacement:
Figure FDA0002197753760000023
in the formula:
theta is a central angle corresponding to the bent strain rod of the strain unit;
r is the radius of the cross section of the strain rod;
l is the original length of the strain rod of the strain unit;
Δxihorizontal displacement in the x + direction at the upper end point of a strain rod of the strain unit;
Δyihorizontal displacement in the y + direction at the upper end point of the strain rod of the strain unit;
Δithe x + direction and the y + direction of the upper end point of the strain rod of the strain unit are combined to be horizontally displaced.
6. A method of strain gage drilling inclination measurement as claimed in claim 5, wherein: and also includes S5, the cumulative displacement of the strain rod is calculated, as follows,
cumulative horizontal displacement in the x direction:
Figure FDA0002197753760000031
cumulative horizontal displacement in the y-direction:
cumulative resultant horizontal displacement
Figure FDA0002197753760000033
In the formula:
n is the number of the strain units;
Δxaccumulating the displacement for the x direction;
Δyaccumulating the displacement for the y direction;
and delta is the accumulated total displacement of the strain rod on the horizontal plane.
7. A method of strain gage drilling inclination measurement as claimed in claim 5, wherein: s6, setting the included angle between the micro strain in the x + direction of the strain unit i and the actual main sliding direction of the landslide as alphaiThen, then
Figure FDA0002197753760000034
Figure FDA0002197753760000041
The degree to which the actual main direction of landslide is offset from the x + direction can be calculated by:
Figure FDA0002197753760000042
Figure FDA0002197753760000044
Figure FDA0002197753760000045
in the formula:
Rithe radius of curvature of the strain rod of the variable unit i after bending;
θiis the central angle corresponding to the bending section of the strain rod of the variable unit i.
CN201910853977.0A 2019-09-10 2019-09-10 Intelligent strain type drilling clinometer and measuring method Pending CN110685670A (en)

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CN112247205A (en) * 2020-07-29 2021-01-22 南京理工大学 Gun drill for deep hole machining based on piezoceramic material deviation correction and deviation correction method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111778964A (en) * 2020-07-24 2020-10-16 中国建筑第八工程局有限公司 Foundation pit hollow support pile, construction method thereof and foundation pit support structure
CN111778964B (en) * 2020-07-24 2022-04-12 中国建筑第八工程局有限公司 Foundation pit hollow support pile, construction method thereof and foundation pit support structure
CN112247205A (en) * 2020-07-29 2021-01-22 南京理工大学 Gun drill for deep hole machining based on piezoceramic material deviation correction and deviation correction method
CN112247205B (en) * 2020-07-29 2022-06-10 南京理工大学 Gun drill for deep hole machining based on piezoceramic material deviation correction and deviation correction method

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