CN105258829A - Underground engineering model test internal space stress measuring device and method - Google Patents
Underground engineering model test internal space stress measuring device and method Download PDFInfo
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- CN105258829A CN105258829A CN201510793814.XA CN201510793814A CN105258829A CN 105258829 A CN105258829 A CN 105258829A CN 201510793814 A CN201510793814 A CN 201510793814A CN 105258829 A CN105258829 A CN 105258829A
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Abstract
The invention relates to an internal space stress measuring device and method, in particular, an underground engineering model test internal space stress measuring device and method. The measuring device comprises a unit stress gauge, a strain acquisition instrument and an analysis module; the unit stress gauge includes resistance strain gauges and a similar unit block; three resistance strain gauges are pasted respectively on three diagonally-adjacent surfaces of the similar unit block; the similar unit block is designed according to the mechanical properties of similar materials and matching requirements; the elastic modulus of the similar unit block is equivalent to the elastic modulus of the material of a model; the analysis module programmed by the MATALAB is utilized to automatically lead in data acquired by the strain acquisition instrument, and then, six stress components of which the loading directions are perpendicular or parallel to each other and the magnitudes and directions of main stresses can be directly displayed, and stress components in any directions can be outputted, and therefore, measurement of the internal space stress state of the model and real-time monitoring of stress change in a test loading process can be realized. The device of the invention has the advantages of simple structure, convenient installation and testing and high accuracy, and can be widely used in model tests.
Description
Technical field
The present invention relates to a kind of internal stress measurement mechanism and method, especially a kind of underground project model test inner space stress measurement device and method.
Background technology
At present, the method that the stress state obtaining model test inside often adopts is that pressure cell, strain brick etc. are imbedded in inside, and pressure cell can only survey the pressure in certain direction, can't resolve complicated space stress problem.Although strain brick can stress on indirect inspection different directions, but off size reason etc. that is comparatively obvious with the rigidity difference between cast material due to sensor material and embedded-type sensor, directly affects the degree of accuracy that it is measured, especially after traditional measuring method directly cannot obtain inner space excavation, principle stress in country rock not parallel with loading direction or vertical time stress state, limit its application in three-dimensional stereo model.
Summary of the invention
Goal of the invention: the object of the invention is the weak point overcoming existing measuring method, a kind of underground project model test inner space stress measurement device and method are provided, realize the real-time monitoring to STRESS VARIATION in the measurement of model inner space stress state and test loading procedure.
Technical scheme: in order to realize foregoing invention object, technical scheme of the present invention is: monitoring underground project model test inner space stress comprises measurement mechanism and measuring method in real time:
Measurement mechanism comprises: element stress meter, strain acquirement instrument and analysis module; Element stress meter, strain acquirement instrument and analysis module are linked in sequence; Described element stress meter is made up of resistance strain gage and similar units block; Described similar units block adopts the polyurethane suitable with cast material elastic modulus to be made; Three resistance strain gages are pasted in three faces adjacent at the diagonal angle of similar units block respectively, and wherein the direction of two foil gauges is orthogonal, another strainometer and the first two angle at 45 °; Strain value on described strain acquirement instrument collecting unit taseometer; Described analysis module is the software for calculation utilizing Matalab to work out.
Described element stress meter is embedded in model close beta point; The Detection Information that element stress meter obtains imports analysis module by strain acquirement instrument, and display model inner space directly perceived stress state on analysis module, described stress state comprises the components of stress of principle stress size and Orientation, any direction.
Measuring method is: element stress meter obtains ε by three orthogonal directions foil gauges
x, ε
y, ε
z, survey the ε obtained
xy (45 °), ε
yz (45 °), ε
zx (45 °)and ε
x, ε
y, ε
zcalculate shearing strain γ
xy, γ
yz, γ
xz, according to ε
x, ε
y, ε
zand γ
xy, γ
yz, γ
xzsix components of strain can solve σ
x, σ
y, σ
z, τ
xy, τ
yz, τ
zxsix components of stress, and then solve the size and Orientation of three principle stresses, obtain the space stress state of test point;
Utilize Matalab software for calculation that whole computation process is compiled into analysis module, the computing method of analysis module: to the data analysis process gathered in the data importing pretreatment module first gathered by strain acquirement instrument, to judge whether data have reliability; The data importing stress processed is solved module, solves the components of stress of loading direction and the size and Orientation of principle stress; Again the size and Orientation of principle stress is imported stress state analysis module, solve the stress state on any direction; Realization is to the real-time monitoring of STRESS VARIATION in the measurement of model inner space stress state and test loading procedure.
Beneficial effect, owing to have employed such scheme, after the data importing that strainmeter gathers by the analysis module utilizing Matalab to work out, can direct display model inner space stress state, comprise the components of stress etc. of principle stress size and Orientation, any direction, realize the real-time monitoring to STRESS VARIATION in the measurement of model inner space stress state and test loading procedure.Overcome the problems such as the off size reason of sensor material and embedded-type sensor too large with the rigidity difference between cast material, the making material of described similar units block has high strength, the advantages such as good springiness, and the elastic modulus of elastic modulus and cast material is suitable, achieve the real-time monitoring to STRESS VARIATION in the measurement of model inner space stress state and test loading procedure, for monitoring and test the space stress state of resemble simulation test inside, especially the STRESS VARIATION situation of country rock inside in underground project model test, comprise the components of stress and the principle stress size of any direction, direction etc.
Advantage: structure simple structure of the present invention, installation and checkout is convenient, and has higher degree of accuracy, can be widely used in model test.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is analysis module process flow diagram of the present invention.
In figure: 1, the first foil gauge; 2, the second foil gauge; 3, the 3rd foil gauge; 4, the 4th foil gauge; 5, the 5th foil gauge; 6, the 6th foil gauge; 7, the 7th foil gauge; 8, the 8th foil gauge; 9, the 9th foil gauge.
Embodiment
Real-time monitoring underground project model test inner space stress comprises measurement mechanism and measuring method:
Measurement mechanism comprises: element stress meter, strain acquirement instrument and analysis module; Element stress meter, strain acquirement instrument and analysis module are linked in sequence; Described element stress meter is made up of resistance strain gage and similar units block (10mm × 10mm × 10mm); Described resistance strain gage specification is B × 120-3CA (grid length × grid width=3 × 2mm), can be buied by market; Described similar units block adopts the polyurethane suitable with cast material elastic modulus to be made; Three resistance strain gages are pasted in three faces adjacent at the diagonal angle of similar units block respectively, and wherein the direction of two foil gauges is orthogonal, another strainometer and the first two angle at 45 ° (as shown in Figure 1); Strain value on described strain acquirement instrument collecting unit taseometer; Described analysis module is the software for calculation utilizing Matalab to work out.
Described element stress meter is embedded in test point needed for model inside; The Detection Information that element stress meter obtains imports analysis module by strain acquirement instrument, and display model inner space directly perceived stress state on analysis module, described stress state comprises the components of stress of principle stress size and Orientation, any direction.
Described similar units block is according to the mechanical characteristic of analog material and coupling requirement, employing polyurethane designs and produces, it has the advantages such as high strength, good springiness, elastic modulus be controlled, can experimentally need to select the material suitable with cast material elastic modulus to test.Similar units block, when unit size is enough little, can be similar to the mean stress situation thought and represent in certain tangent stress or zonule, considers the paster requirement of foil gauge, similar units block be designed and sized to 10mm × 10mm × 10mm.
Measuring method is: element stress meter obtains ε by three orthogonal directions foil gauges
x, ε
y, ε
z, survey the ε obtained
xy (45 °), ε
yz (45 °), ε
zx (45 °)and ε
x, ε
y, ε
zcalculate shearing strain γ
xy, γ
yz, γ
xz, according to ε
x, ε
y, ε
zand γ
xy, γ
yz, γ
xzsix components of strain can solve σ
x, σ
y, σ
z, τ
xy, τ
yz, τ
zxsix components of stress, and then solve the size and Orientation of three principle stresses, obtain the space stress state of test point;
Utilize Matalab software for calculation that whole computation process is compiled into analysis module, the computing method of analysis module: to the data analysis process gathered in the data importing pretreatment module first gathered by strain acquirement instrument, to judge whether data have reliability; The data importing stress processed is solved module, solves the components of stress of loading direction and the size and Orientation of principle stress; Again the size and Orientation of principle stress is imported stress state analysis module, solve the stress state on any direction; Realization is to the real-time monitoring of STRESS VARIATION in the measurement of model inner space stress state and test loading procedure.
Below in conjunction with accompanying drawing, the present invention is further described.
The present invention is made up of element stress meter, strain acquirement instrument 10 and analysis module three parts.Element stress meter is made up of resistance strain gage and similar units block (10mm × 10mm × 10mm).Described resistance strain gage specification is B × 120-3CA (grid length × grid width=3 × 2mm), can be buied by market; Described similar units block adopts the polyurethane suitable with cast material elastic modulus to be made; Three resistance strain gages are pasted in three faces adjacent at the diagonal angle of similar units block respectively, and wherein the direction of two foil gauges is orthogonal, and another strainometer and the first two angle at 45 ° are as shown in Figure 1.Wherein, the first foil gauge 1, the 3rd foil gauge 3, the 6th foil gauge 6 are respectively used to measure ε
x, ε
y, ε
z, the 7th foil gauge 7, the 4th foil gauge 4, the 9th foil gauge 9 are for checking, and the second foil gauge 2, the 5th foil gauge 5, the 8th foil gauge 8 are respectively used to measure ε
xy (45 °), ε
yz (45 °), ε
zx (45 °).Be connected on strain acquirement instrument by these 9 foil gauges, the pretreatment module that the data importing of collection is worked out to Matalab is carried out analyzing and processing to data by strainmeter, judges whether data have reliability.The data importing stress processed solves module, solves the components of stress of loading direction and the size and Orientation of principle stress; Again the size and Orientation of principle stress is imported stress state analysis module, solve the stress state on any direction.
In modelling process, this element stress meter is placed on required test point, element stress meter is embedded in model close beta point and forms with it an entirety and reduce the interference to model itself to greatest extent, the space stress state of the real reaction model close beta point of energy.
Claims (3)
1. a underground project model test inner space stress measurement device, is characterized in that: measurement mechanism comprises: element stress meter, strain acquirement instrument and analysis module; Element stress meter, strain acquirement instrument and analysis module are linked in sequence; Described element stress meter is made up of resistance strain gage and similar units block; Described similar units block adopts the polyurethane suitable with cast material elastic modulus to be made; Three resistance strain gages are pasted in three faces adjacent at the diagonal angle of similar units block respectively, and wherein the direction of two foil gauges is orthogonal, another strainometer and the first two angle at 45 °; Strain value on described strain acquirement instrument collecting unit taseometer; Described analysis module is the software for calculation utilizing Matalab to work out.
2. a kind of underground project model test inner space according to claim 1 stress measurement device, is characterized in that: described element stress meter is embedded in model close beta point; The Detection Information that element stress meter obtains imports analysis module by strain acquirement instrument, and display model inner space directly perceived stress state on analysis module, described stress state comprises the components of stress of principle stress size and Orientation, any direction.
3. a underground project model test inner space method for measuring stress, is characterized in that: measuring method is: element stress meter obtains ε by three orthogonal directions foil gauges
x, ε
y, ε
z, survey the ε obtained
xy (45 °), ε
yz (45 °), ε
zx (45 °)and ε
x, ε
y, ε
zcalculate shearing strain γ
xy, γ
yz, γ
xz, according to ε
x, ε
y, ε
zand γ
xy, γ
yz, γ
xzsix components of strain can solve σ
x, σ
y, σ
z, τ
xy, τ
yz, τ
zxsix components of stress, and then solve the size and Orientation of three principle stresses, obtain the space stress state of test point;
Utilize Matalab software for calculation that whole computation process is compiled into analysis module, the computing method of analysis module: to the data analysis process gathered in the data importing pretreatment module first gathered by strain acquirement instrument, to judge whether data have reliability; The data importing stress processed is solved module, solves the components of stress of loading direction and the size and Orientation of principle stress; Again the size and Orientation of principle stress is imported stress state analysis module, solve the stress state on any direction; Realization is to the real-time monitoring of STRESS VARIATION in the measurement of model inner space stress state and test loading procedure.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106524988A (en) * | 2016-10-28 | 2017-03-22 | 天津城建大学 | Three-dimensional strain rosette apparatus based on octahedron and test method |
| CN106767971A (en) * | 2016-11-22 | 2017-05-31 | 西安建筑科技大学 | A kind of multidirectional installation method of strain transducer |
| CN106771102A (en) * | 2017-01-25 | 2017-05-31 | 厦门理工学院 | The measuring system and measuring method of Non-load Concrete internal stress in concrete structure |
| CN109406016A (en) * | 2018-12-12 | 2019-03-01 | 中国矿业大学(北京) | A kind of ball-type motion and stress monitoring instrument of side slope model test |
| CN109520830A (en) * | 2018-11-23 | 2019-03-26 | 中国船舶重工集团公司第七〇九研究所 | A kind of pipeline elastic element acoustic states on-Line Monitor Device |
| CN109632158A (en) * | 2018-12-19 | 2019-04-16 | 天地科技股份有限公司 | Model test stress test block and its preparation and application |
| CN111721636A (en) * | 2020-06-30 | 2020-09-29 | 江苏永大化工设备有限公司 | Pressure-bearing equipment pressure-resistant test automatic loading control system |
| CN111811938A (en) * | 2020-07-21 | 2020-10-23 | 重庆大学 | Strain brick and preparation method thereof |
| CN112649130A (en) * | 2020-12-29 | 2021-04-13 | 上海海事大学 | Medical puncture biopsy needle interface interaction mechanical property integrated test and method |
| CN113624123A (en) * | 2021-08-13 | 2021-11-09 | 中国科学院武汉岩土力学研究所 | Three-dimensional strain measurement system based on three-dimensional printing technology and test method thereof |
| CN113758622A (en) * | 2021-08-12 | 2021-12-07 | 华能澜沧江水电股份有限公司 | Method for manufacturing disturbance stress sensor |
| CN117346929A (en) * | 2023-10-12 | 2024-01-05 | 深地科学与工程云龙湖实验室 | Strain brick for measuring internal stress of surrounding rock and application method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106524988A (en) * | 2016-10-28 | 2017-03-22 | 天津城建大学 | Three-dimensional strain rosette apparatus based on octahedron and test method |
| CN106767971A (en) * | 2016-11-22 | 2017-05-31 | 西安建筑科技大学 | A kind of multidirectional installation method of strain transducer |
| CN106771102A (en) * | 2017-01-25 | 2017-05-31 | 厦门理工学院 | The measuring system and measuring method of Non-load Concrete internal stress in concrete structure |
| CN109520830B (en) * | 2018-11-23 | 2024-03-08 | 中国船舶重工集团公司第七一九研究所 | Online monitoring device for acoustic state of pipeline elastic element |
| CN109520830A (en) * | 2018-11-23 | 2019-03-26 | 中国船舶重工集团公司第七〇九研究所 | A kind of pipeline elastic element acoustic states on-Line Monitor Device |
| CN109406016A (en) * | 2018-12-12 | 2019-03-01 | 中国矿业大学(北京) | A kind of ball-type motion and stress monitoring instrument of side slope model test |
| CN109632158A (en) * | 2018-12-19 | 2019-04-16 | 天地科技股份有限公司 | Model test stress test block and its preparation and application |
| CN111721636A (en) * | 2020-06-30 | 2020-09-29 | 江苏永大化工设备有限公司 | Pressure-bearing equipment pressure-resistant test automatic loading control system |
| CN111811938B (en) * | 2020-07-21 | 2022-09-20 | 重庆大学 | Strain brick and preparation method thereof |
| CN111811938A (en) * | 2020-07-21 | 2020-10-23 | 重庆大学 | Strain brick and preparation method thereof |
| CN112649130A (en) * | 2020-12-29 | 2021-04-13 | 上海海事大学 | Medical puncture biopsy needle interface interaction mechanical property integrated test and method |
| CN113758622A (en) * | 2021-08-12 | 2021-12-07 | 华能澜沧江水电股份有限公司 | Method for manufacturing disturbance stress sensor |
| CN113624123A (en) * | 2021-08-13 | 2021-11-09 | 中国科学院武汉岩土力学研究所 | Three-dimensional strain measurement system based on three-dimensional printing technology and test method thereof |
| CN113624123B (en) * | 2021-08-13 | 2022-08-23 | 中国科学院武汉岩土力学研究所 | Three-dimensional strain measurement system based on three-dimensional printing technology and test method thereof |
| CN117346929A (en) * | 2023-10-12 | 2024-01-05 | 深地科学与工程云龙湖实验室 | Strain brick for measuring internal stress of surrounding rock and application method thereof |
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