CN113567024A - Natural stress measuring device - Google Patents
Natural stress measuring device Download PDFInfo
- Publication number
- CN113567024A CN113567024A CN202110806993.1A CN202110806993A CN113567024A CN 113567024 A CN113567024 A CN 113567024A CN 202110806993 A CN202110806993 A CN 202110806993A CN 113567024 A CN113567024 A CN 113567024A
- Authority
- CN
- China
- Prior art keywords
- natural stress
- measuring device
- hydraulic
- optical fiber
- stress
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Abstract
The invention discloses a natural stress measuring device which comprises a flat jack, a hydraulic system, a deformation monitoring system and a data analysis system, wherein the flat jack is used for applying expansion force to a flat cave which is dug in advance, and pressure sensors are arranged on two sides of the flat cave; the hydraulic system is connected with the flat jack and is used for providing hydraulic pressure for the flat jack; the deformation monitoring system is electrically connected with the hydraulic system, the deformation monitoring system is used for measuring the distance between two preset monitoring points, and the hydraulic system can adjust the hydraulic pressure according to the distance measured by the deformation monitoring system; and the data analysis system is electrically connected with the two pressure sensors and used for calculating the magnitude of the natural stress according to the pressure values acquired by the two pressure sensors when the distance between the two monitoring points is restored to the initial value. The invention solves the problem that the existing natural stress measuring method can not meet the technical requirement of rock natural stress test under a complex stress state.
Description
Technical Field
The invention relates to the technical field of rock mechanics, in particular to a natural stress measuring device.
Background
The stress in the rock mass is an important factor that must be considered for rock mass stability and engineering operations. The stresses that exist in rock masses prior to ergonomic activities are known as natural or ground stresses. The result of human engineering activities at or in the rock mass must be a range of changes in the natural stresses in the rock mass. This altered stress in the rock mass due to engineering activities is called redistribution stress. The natural stresses in the rock mass can also be referred to as initial stresses with respect to the redistributed stresses. The rock mass natural stress measurement work in China begins in the later 50 s and is widely applied to production practice only in 60 s. Up to now, tens of thousands of data are obtained in rock stress measurement in China, and an important basis is provided for researching the stability of engineering rock and the dynamics problem of rock rings.
It is generally considered that natural stress is a force of various actions and various origins, and it is mainly composed of a self-weight stress and a structural stress, and sometimes there are a fluid stress and a temperature difference stress, etc. Studies have also shown that the stress state of the rock mass is not only a function of spatial position, but also changes over time. The rock mass is not statically stable under the action of natural stress, but is in a dynamic balance state, once the stress state is changed, the dynamic balance condition is destroyed, and the rock mass is also subjected to the instability phenomenon or the instability phenomenon. The stress state of the rock can be changed by various factors causing the change of the stress condition of the rock, such as the change of the earth rotation speed, the tidal action of the sun and the moon, the change of the solar activity, the human engineering activity and the like.
The relation between the natural stress state and the stability of the rock mass is great, and the relation not only is an important factor for determining the stability of the rock mass, but also directly influences the design and construction of various rock mass projects. More and more data show that rock mass excavation performed in rock mass high stress areas, during earth surface and underground engineering construction, can often cause a series of deformation and failure phenomena in the rock mass, which are linked with excavation unloading resilience and stress release, to destabilize the engineering rock mass.
Since the natural stress of rock mass is a non-measurable physical quantity, it can only be used to measure the change value of measurable physical quantity, such as displacement, strain or resistance, inductance, wave speed, etc. caused by the change of stress, and then inversely calculate the stress value based on some assumption. Therefore, all stress measurement methods used at home and abroad at present are realized by a method of disturbing stress in a rock mass caused by grooving on a drilling hole, underground excavation or exposed surface and then measuring various physical change values generated due to the stress disturbance by using various probes. At present, the most common stress measurement at home and abroad is three methods, namely a hydraulic fracturing method, a flat jack method and a drilling sleeve stress relief method. However, the hydraulic fracturing method has the defect that the main stress direction is not accurately positioned; the displacement measurement in the flat jack method is not accurate enough; the stress relief method can only measure the natural stress of a shallow part (within 30 meters), has large depth, large drilling technology difficulty and low precision.
In summary, the current natural stress measurement method cannot meet the technical requirements of rock natural stress test under complex stress state.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a natural stress measuring device, which solves the technical problem that the natural stress measuring method in the prior art cannot meet the technical requirements of rock natural stress test in a complex stress state.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention provides a natural stress measuring device, which comprises a flat jack, a hydraulic system and a deformation monitoring system, wherein,
comprises a flat jack, a hydraulic system, a deformation monitoring system and a data analysis system, wherein,
the flat jack is used for applying expansion force to a flat cave excavated in advance, and pressure sensors are arranged on two sides of the flat cave;
the hydraulic system is connected with the flat jack and is used for providing hydraulic pressure for the flat jack;
the deformation monitoring system is electrically connected with the hydraulic system and is used for measuring the distance between two preset monitoring points, and the hydraulic system can adjust the hydraulic pressure according to the distance measured by the deformation monitoring system;
and the data analysis system is electrically connected with the two pressure sensors and used for calculating the magnitude of the natural stress according to the pressure values acquired by the two pressure sensors when the distance between the two monitoring points is restored to the initial value.
Preferably, natural stress measuring device in, hydraulic system includes hydraulic oil pump, supplies oil pipe and controller, the hydraulic oil pump passes through supply oil pipe with flat jack is connected, the hydraulic oil pump still with the controller electricity is connected, the controller still with deformation monitoring system electricity is connected, the controller is used for the basis distance between two monitoring points of deformation detection system monitoring adjusts the power of hydraulic oil pump.
Preferably, in the natural stress measuring device, the hydraulic system further includes a lifting table, and the hydraulic oil pump is fixedly disposed on the lifting table.
Preferably, in the natural stress measuring device, an oil pump control valve and a jack control valve are arranged on the oil supply pipe.
Preferably, in the natural stress measuring device, the oil supply pipe is further connected to a dial indicator.
Preferably, in the natural stress measuring device, the deformation monitoring system includes an optical fiber sensor, a sensor fixing tube, an optical fiber box and a monitoring host, the optical fiber sensor is electrically connected to the monitoring host through the optical fiber box, the sensor fixing tube is disposed between two monitoring points and used for fixing the optical fiber sensor, the monitoring host is further electrically connected to the controller, and the monitoring host is used for receiving a detection signal sent by the optical fiber sensor to generate a distance value and outputting the distance value to the controller.
Preferably, in the natural stress measuring device, the sensor fixing tube is a polyethylene tube, and the optical fiber sensor is fixedly connected to the polyethylene tube.
Preferably, in the natural stress measuring device, a balancing tool ring is arranged on the flat jack.
Preferably, in the natural stress measuring device, at least two inclination sensors are further disposed on the flat jack.
Preferably, the natural stress measuring device further comprises a movable base, and the hydraulic system is fixed on the movable base.
Compared with the prior art, the natural stress measuring device provided by the invention utilizes the flat jack to apply axial force to the cave after the cave is excavated so as to restore the cave to the state before excavation, then, after the cave is restored to the state before excavation, the two pressure sensors are used for collecting the stress of the bottom plate and the stress of the side wall in real time, the data analysis system can calculate the magnitude of the natural stress according to the stress of the bottom plate and the stress of the side wall, the structure is simple, the accuracy is good, the operation is convenient, the cost is saved, the measurement is accurate, but also can not cause the problems of inaccurate positioning and displacement measurement or high difficulty and low precision of the trepanning drilling technology, the method can meet the technical requirements of demonstrating natural stress tests in a complex stress state, and can provide a more reliable experimental method and experimental results for predicting rock mass deformation monitoring, rock fracture and preventing accidents such as mine disasters and tunnel disasters caused by rock mass fracture.
Drawings
FIG. 1 is a side view of a preferred embodiment of a natural stress measurement apparatus provided by the present invention;
FIG. 2 is a schematic elevation view of a preferred embodiment of a natural stress measuring device according to the present invention;
FIG. 3 is a schematic view of a preferred embodiment of the deformation monitoring system of the natural stress measuring device of the present invention;
FIG. 4 is a schematic diagram of a preferred embodiment of the flat jack of the natural stress measuring device of the present invention;
FIG. 5 is a schematic illustration of the natural stress determination of the present invention;
fig. 6 is a stress profile for excavating a cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, a natural stress measuring device according to an embodiment of the present invention includes a flat jack 1, a hydraulic system 2, a deformation monitoring system 3, and a data analysis system (not shown).
The flat jack 1 is used for applying expansion force to a pre-drilled flat hole 4, and pressure sensors (not shown in the figure) are arranged on two sides of the flat hole;
the hydraulic system 2 is connected with the flat jack 1 and is used for providing hydraulic pressure for the flat jack 1;
the deformation monitoring system 3 is electrically connected with the hydraulic system 2, the deformation monitoring system 3 is used for measuring the distance between two preset monitoring points (point A and point B in fig. 1), and the hydraulic system 2 can adjust the hydraulic pressure according to the distance measured by the deformation monitoring system 3;
and the data analysis system is electrically connected with the two pressure sensors and used for calculating the magnitude of the natural stress according to the pressure values acquired by the two pressure sensors when the distance between the two monitoring points is restored to the initial value.
In this embodiment, at first cave excavation is carried out on the cliff, and is concrete, in cliff cave excavation engineering, traditional construction method is according to the angle of oblique rock-bridge, sets up chisel hole steel pipe scaffold, and the chisel hole angle mainly adopts the steel pipe to fix on the scaffold, through direction steel pipe control, and the chisel hole degree of depth mainly adopts fixed length drilling rod, the outside increases the spacing measure of horizontal pole. The construction method belongs to the traditional mode, and if a scaffold is erected nonstandard, a hole drilling oblique angle is difficult to control, so that the excavation quality of a rock wall beam is influenced; in addition, a large amount of turnover materials are needed for building the scaffold, and the scaffold is frequently built and dismantled, so that the materials are wasted, and time and labor are wasted. The guide positioning device is simple in manufacture, convenient and fast to operate, high in recycling frequency, low in cost and beneficial to quality control of rock wall beam inclined surface light explosion hole drilling forming, is a novel rock wall hole drilling technology, and overcomes the defects that a traditional scaffold is erected, materials are wasted, time and labor are wasted, and quality control is not facilitated. The specific scheme is as follows: the rock wall beam inclined surface light explosion punching guiding and positioning device comprises a guiding and positioning pipe, wherein the lower part of the guiding and positioning pipe is connected with a movable and vertically telescopic frame body which is symmetrically arranged, the frame body comprises a channel steel cross frame, telescopic longitudinal supporting rods and a longitudinal fixing support, the longitudinal supporting rods are vertically connected with the channel steel cross frame, and the longitudinal fixing support is connected with the longitudinal supporting rods and the channel steel cross frame. The excavated hole is kept horizontal and straight, the upper side and the lower side of the hole are kept orderly, the residual bulges are ground flat, and the stress concentration effect is reduced as much as possible.
After the cave is excavated, the measurement of natural stress can be started, specifically, the flat jack 1 is placed in the excavated flat cave, and then the hydraulic system 2 is started to supply hydraulic pressure to the flat jack 1, so that the flat jack 1 can generate expanded axial force to force the deformation of the flat cave to be recovered to the condition before excavation. In order to judge whether the flat cave is restored to the condition before excavation or not, the embodiment of the invention is provided with a deformation monitoring system, the deformation monitoring system firstly obtains an initial distance between two preset monitoring points, then monitors the distance in real time in the process that the flat jack 1 applies axial force to the cave, if the distance is restored to the initial distance, the flat cave is restored to the condition before excavation, at the moment, pressure values collected by two pressure sensors are obtained, and the data analysis system can calculate the magnitude of the natural stress.
In addition, before the preset distance between the two monitoring points is not restored to the initial value, if the axial force applied by the flat jack 1 cannot enable the real-time distance to continuously change, the hydraulic system can adjust the magnitude of the hydraulic pressure according to the distance measured by the deformation monitoring system at the moment, so that the distance is changed until the initial distance value is reached.
Preferably, as shown in fig. 5 and 6, the data analysis system first selects the measuring points a and B of the two walls of the rock mass and measures the vertical distance d between the two points when calculating the natural stress0Then, a rock wall cave is drilled, and after the cave is relatively stable in deformation, the two rock masses are measured by the deformation monitoring system 3The deformation value d between the walls is exerted by the flat jack 1, and the distance between the two walls AB of the rock body is restored to the initial distance d0At this time, the corresponding jack pressure is the bottom plate stress sigma collected by the two pressure sensorsθRAnd sidewall stress σθw. Then, the stress sigma of the base plate can be determinedθRAnd sidewall stress σθwCalculating the thermal stress, specifically, assuming the natural stress as the horizontal stress field, and measuring the sidewall stress sigmaθRAnd baseplate stress σθWThen, there are:
wherein σvIs vertical natural stress, σhIs vertical natural stress, σθwIs the side wall stress, σθRIs the baseplate stress.
In the embodiment of the invention, after the hole is drilled, the flat jack 1 is utilized to apply axial force to the hole to restore the hole to the state before drilling, then, after the cave is restored to the state before excavation, the two pressure sensors are used for collecting the stress of the bottom plate and the stress of the side wall in real time, the data analysis system can calculate the magnitude of the natural stress according to the stress of the bottom plate and the stress of the side wall, the structure is simple, the accuracy is good, the operation is convenient, the cost is saved, the measurement is accurate, but also can not cause the problems of inaccurate positioning and displacement measurement or high difficulty and low precision of the trepanning drilling technology, the method can meet the technical requirements of demonstrating natural stress tests in a complex stress state, and can provide a more reliable experimental method and experimental results for predicting rock mass deformation monitoring, rock fracture and preventing accidents such as mine disasters and tunnel disasters caused by rock mass fracture.
In a preferred embodiment, please refer to fig. 1, the hydraulic system 2 includes a hydraulic oil pump 21, an oil supply pipe 22 and a controller (not shown in the figure), the hydraulic oil pump is connected to the flat jack 1 through the oil supply pipe 22, the hydraulic oil pump 21 is further electrically connected to the controller, the controller is further electrically connected to the deformation monitoring system 3, and the controller is configured to adjust the power of the hydraulic oil pump 21 according to the distance between two monitoring points monitored by the deformation detecting system 3.
In this embodiment, hydraulic oil pump 21 is adopted to provide hydraulic pressure, and the controller can adjust hydraulic oil pump 21 according to different frequencies, makes hydraulic oil pump 21 output different pressures, and then guarantees that two monitoring points can resume to initial distance. The hydraulic oil pump 21 is filled with hydraulic oil 23, the hydraulic oil pump 21 is provided with an oil pump handle 24, during specific implementation, a preset axial force value is selected, the axial force is preset through computer input, the loading rate is set, the hydraulic oil pump 21 is controlled in an instruction mode to provide hydraulic pressure, the pressure sensor transmits real-time monitoring and feeds back an axial load, when the feedback value of the pressure sensor is the preset axial force value, the hydraulic pressure is kept unchanged, the monitoring deformation is observed, if the monitoring deformation value is still slightly smaller than the initial distance between two monitoring points, the hydraulic oil pump 21 is controlled in an instruction mode to provide hydraulic pressure, the axial stress borne by the two walls is increased, the loading is stopped until the deformation between the rock walls is recovered, and the corresponding axial pressure is sigma at the momentvDuring this time, the data is monitored in real time.
In a further embodiment, the hydraulic system 2 further includes a lifting platform (not shown in the figure), the hydraulic oil pump 21 is fixedly disposed on the lifting platform, and the height of the hydraulic oil pump 21 is controlled by the lifting platform, so that the natural stress measuring apparatus can adapt to different use scenarios.
In a further embodiment, the oil supply pipe 21 is provided with an oil pump control valve 25 and a jack control valve 26, the oil pump control valve 25 is used for controlling the magnitude of the hydraulic pressure output by the hydraulic oil pump 21, and the jack control valve 26 is used for controlling the magnitude of the hydraulic pressure input to the flat jack 1.
In a further embodiment, the oil supply pipe 22 is further connected with a dial indicator 27, and the dial indicator 27 is used for monitoring the hydraulic pressure in the oil supply pipe 22, so that the operation and the control of workers are facilitated.
In a further embodiment, referring to fig. 2 and 3, the deformation monitoring system 3 includes an optical fiber sensor 31, a sensor fixing tube 32, an optical fiber box 33, and a monitoring host (not shown in the figure), where the optical fiber sensor 31 is electrically connected to the monitoring host through the optical fiber box 33, the sensor fixing tube 32 is disposed between two monitoring points and is used to fix the optical fiber sensor 31, the monitoring host is further electrically connected to the controller, and the monitoring host is configured to receive a detection signal sent by the optical fiber sensor 31 to generate a distance value, and output the distance value to the controller.
In this embodiment, after the monitoring points a and B are selected, monitoring devices, mainly optical fiber sensors, are respectively arranged at the monitoring points a and B, a loop is arranged, and an optical fiber signal line is connected to the optical fiber box 33 and then transmitted to the monitoring host. The optical fiber sensor is a sensor which converts the state of a measured object into a measurable optical signal. The optical fiber sensor has the working principle that light beams incident from a light source are sent into a modulator through an optical fiber, the light beams interact with external measured parameters in the modulator, so that optical properties of the light, such as intensity, wavelength, frequency, phase, polarization state and the like, are changed to form modulated light signals, and the modulated light signals are sent into a photoelectric device through the optical fiber and then are demodulated to obtain the measured parameters. In the whole process, the light beam is guided in through the optical fiber, passes through the modulator and then is emitted, wherein the optical fiber firstly plays the role of transmitting the light beam and secondly plays the role of an optical modulator. The optical fiber sensor is an optical fiber acoustic sensor, which is a sensor utilizing an optical fiber. When the optical fiber is subjected to a very slight external force, the optical fiber is slightly bent, and the light transmission capacity of the optical fiber is greatly changed. The sound is a mechanical wave, and the effect of the mechanical wave on the optical fiber is to stress the optical fiber and generate bending, so that the strength of the sound can be obtained through the bending.
Preferably, the fixed pipe 32 of sensor is the polyethylene pipe, optical fiber sensor 31 with polyethylene pipe fixed connection adopts the polyethylene pipe to bind together with optical fiber sensor 31, and is fixed through a plurality of screw threads 34, can guarantee the steadiness of optical fiber sensor installation, avoids producing the deviation.
Furthermore, in order to facilitate the shielding signal wire of the optical fiber to penetrate out of the communication channel, a drill hole communicated with the reserved communication channel is drilled on the base positioned in the polyethylene pipe, and the drill hole is sealed by epoxy resin after the shielding signal wire penetrates through the drill hole.
Further, a rubber plug is arranged in the long groove of the polyethylene tube cavity, a rectangular cutting groove is formed in the rubber plug, and the optical fiber sensor 31 is plugged into the rubber plug and penetrates through the long groove of the cavity. The optical fiber box 33 is fixed on the ground through a fixing frame 35.
In the embodiment, the optical fiber circuit and the polyethylene pipe are fixed together, and the polyethylene pipe has good sanitary performance, no toxicity in material, no scaling layer, no bacteria breeding and prevention of secondary pollution to the environment; has excellent corrosion resistance: besides a few strong oxidants, the catalyst can resist the erosion of various chemical media; the pipeline has long service life, and can be safely used for more than 50 years under the conditions of rated temperature and pressure; the pipe has good impact resistance, good toughness and high impact strength, and the pipeline can not be broken when a heavy object is directly pressed through the pipeline; the pipe has reliable connection performance, the strength of the hot melting or electric melting interface of the pipe is higher than that of the pipe body, and the joint cannot be broken due to the movement of a rock body or the action of live load; the construction performance is good: the pipeline is light in weight, simple in welding process, convenient to construct and low in comprehensive construction cost. Therefore, the pipeline can be used for monitoring the change rule of the natural stress for a long time, and can be used for monitoring the deformation under the condition of large deformation.
In a preferred embodiment, referring to fig. 4, the flat jack 1 is provided with a balance tool ring 4, and the balance tool ring 4 is used for ensuring the balance of the expansion force applied by the flat jack 1.
In a preferred embodiment, referring to fig. 4, the flat jack 1 is further provided with at least two tilt angle sensors 5, and the two tilt angle sensors 5 are used for detecting an offset angle of the flat jack 1, so that the flat jack 1 can apply uniform axial force to two sides of the cave, and thereby the rock walls on the upper side and the lower side in the vertical direction are uniformly loaded. Wherein, two inclination sensors 5 all are connected with the host computer through connecting wire 6, convenience of customers control.
In a preferred embodiment, the natural stress measuring device further includes a movable base (not shown in the figure), the hydraulic system 2 is fixed on the movable base, and the movable base is arranged to facilitate the movement and fixation of the natural stress measuring device, so as to facilitate the operation of a user.
In summary, the invention provides a natural stress measuring device suitable for a stress recovery method based on an optical fiber technology, which has the advantages of simple principle, convenient operation, low cost, reasonable and reliable result, and can carry out rock natural stress measurement under complex conditions and reasonably determine the rock natural stress according to different construction conditions and different excavation disturbance degrees. The invention has small processing difficulty, convenient and flexible operation, convenient disassembly of the flat jack and the optical fiber, repeated use of the tilt angle sensor, capability of measuring the natural stress state of the vertical natural rock mass and positioning research of the direction thereof, and is particularly suitable for the experimental research of the deformation recovery of the rock mass material in the low stress area. The research result can be used for predicting rock mass deformation monitoring and rock fracture, and providing a more reliable experimental method and experimental results for preventing accidents such as mine disasters and tunnel disasters caused by rock mass fracture.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A natural stress measuring device is characterized by comprising a flat jack, a hydraulic system, a deformation monitoring system and a data analysis system, wherein,
the flat jack is used for applying expansion force to a flat cave excavated in advance, and pressure sensors are arranged on two sides of the flat cave;
the hydraulic system is connected with the flat jack and is used for providing hydraulic pressure for the flat jack;
the deformation monitoring system is electrically connected with the hydraulic system and is used for measuring the distance between two preset monitoring points, and the hydraulic system can adjust the hydraulic pressure according to the distance measured by the deformation monitoring system;
and the data analysis system is electrically connected with the two pressure sensors and used for calculating the magnitude of the natural stress according to the pressure values acquired by the two pressure sensors when the distance between the two monitoring points is restored to the initial value.
2. The natural stress measuring device of claim 1, wherein the hydraulic system comprises a hydraulic oil pump, an oil supply pipe and a controller, the hydraulic oil pump is connected with the flat jack through the oil supply pipe, the hydraulic oil pump is further electrically connected with the controller, the controller is further electrically connected with the deformation monitoring system, and the controller is used for adjusting the power of the hydraulic oil pump according to the distance between the two monitoring points monitored by the deformation detecting system.
3. The natural stress measuring device of claim 2, wherein the hydraulic system further comprises a lift table, and the hydraulic oil pump is fixedly disposed on the lift table.
4. The natural stress measuring device of claim 2, wherein an oil pump control valve and a jack control valve are provided on the oil supply pipe.
5. The natural stress measuring device of claim 2, wherein a dial indicator is further connected to the oil supply pipe.
6. The natural stress measuring device of claim 2, wherein the deformation monitoring system comprises an optical fiber sensor, a sensor fixing tube, an optical fiber box and a monitoring host, the optical fiber sensor is electrically connected with the monitoring host through the optical fiber box, the sensor fixing tube is arranged between two monitoring points and is used for fixing the optical fiber sensor, the monitoring host is further electrically connected with the controller, and the monitoring host is used for receiving a detection signal sent by the optical fiber sensor to generate a distance value and outputting the distance value to the controller.
7. The natural stress measuring device of claim 4, wherein the sensor fixing tube is a polyethylene tube, and the optical fiber sensor is fixedly connected to the polyethylene tube.
8. A natural stress measuring device according to claim 1, wherein a balancing tool ring is provided on the flat jack.
9. The natural stress measuring device of claim 1, wherein at least two tilt sensors are further provided on the flat jack.
10. The natural stress measuring device of claim 1, further comprising a movable base, wherein the hydraulic system is secured to the movable base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110806993.1A CN113567024A (en) | 2021-07-16 | 2021-07-16 | Natural stress measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110806993.1A CN113567024A (en) | 2021-07-16 | 2021-07-16 | Natural stress measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113567024A true CN113567024A (en) | 2021-10-29 |
Family
ID=78165250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110806993.1A Pending CN113567024A (en) | 2021-07-16 | 2021-07-16 | Natural stress measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113567024A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6029526A (en) * | 1998-05-14 | 2000-02-29 | Shannon & Wilson, Inc. | Method and apparatus for measuring in situ or stress of concrete |
| CN102979458A (en) * | 2012-12-13 | 2013-03-20 | 中国水利水电第十四工程局有限公司 | Rock wall beam oblique surface smooth blasting punching guiding and positioning device |
| CN205012990U (en) * | 2015-09-10 | 2016-02-03 | 刘庆军 | Drilling stress monitoring system |
| CN111238931A (en) * | 2019-12-30 | 2020-06-05 | 长江大学 | Shale brittleness index evaluation method based on energy evolution |
-
2021
- 2021-07-16 CN CN202110806993.1A patent/CN113567024A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6029526A (en) * | 1998-05-14 | 2000-02-29 | Shannon & Wilson, Inc. | Method and apparatus for measuring in situ or stress of concrete |
| CN102979458A (en) * | 2012-12-13 | 2013-03-20 | 中国水利水电第十四工程局有限公司 | Rock wall beam oblique surface smooth blasting punching guiding and positioning device |
| CN205012990U (en) * | 2015-09-10 | 2016-02-03 | 刘庆军 | Drilling stress monitoring system |
| CN111238931A (en) * | 2019-12-30 | 2020-06-05 | 长江大学 | Shale brittleness index evaluation method based on energy evolution |
Non-Patent Citations (6)
| Title |
|---|
| J.LOUREIRO-PINTO等: "用大型扁千斤顶技术测定变形模量的建议方法", 《岩石力学与工程学报》, no. 01, pages 77 - 87 * |
| YOKOYAMA T等: "钻孔千斤顶压裂测量技术的发展和原地测量", 《国际地震动态》, no. 01, 25 January 2011 (2011-01-25), pages 71 - 80 * |
| 李方全: "地应力测量", 《岩石力学与工程学报》, no. 01, pages 98 - 114 * |
| 王春来等: "《现代岩土测试技术》", 30 April 2019, 冶金工业出版社, pages: 32 - 33 * |
| 王春来等: "现代岩土测试技术", 应力恢复法, pages: 32 - 33 * |
| 郭天太等: "《"十三五"普通高等教育规划教材传感器技术》", 31 August 2019, 机械工业出版社, pages: 156 - 157 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206512764U (en) | A kind of horizontally loading test system for applying vertical load in stake top | |
| CN105181199B (en) | A kind of side hole stress relief method of detecting earth stress | |
| CN201109914Y (en) | Apparatus for monitoring sedimentation of soft soil foundation | |
| Zhu et al. | Combined application of optical fibers and CRLD bolts to monitor deformation of a pit-in-pit foundation | |
| CN103278384B (en) | Testing device and measuring method for anchorage performance of coal and rock mass in coal mine tunnel | |
| CN106049559B (en) | A kind of large diameter pile foundation autobalanced detection method based on load-compensating | |
| CN103643668B (en) | A kind of method of architectural engineering pit monitoring | |
| CN203551406U (en) | Soil-rock mass in-situ direct shear test device with automatic data acquisition system | |
| CN203848966U (en) | Impactor impact force detection device | |
| CN105971615A (en) | Dynamic feedback adjusting shield tunneling earth pressure balance control method | |
| CN107882011B (en) | miniature probe with temperature compensation function | |
| KR20090071102A (en) | Load test apparatus for pile type structure | |
| CN102808429B (en) | Pile foundation soaking load test method based on creep-strain separation | |
| CN210720389U (en) | Tunnel excavation process analogue test device | |
| CN214747897U (en) | Building construction monitoring system | |
| CN105043611B (en) | A kind of swelled ground lateral swelling force in-situ testing device | |
| CN113591347A (en) | Dynamic monitoring method and early warning system in high slope construction process | |
| CN106088171B (en) | A kind of prefabricated pile Horizontal Displacement and pile body stress joint test method | |
| CN113567024A (en) | Natural stress measuring device | |
| CN204924504U (en) | Division testing arrangement is separated to deep crustal stress part | |
| CN217504685U (en) | Deformation monitoring system | |
| CN107992673B (en) | Exploration depth determination method for karst area bridge pile foundation | |
| CN113756781B (en) | Low-cost ground stress testing method | |
| CN105092105A (en) | Deep crustal stress local relief method testing device | |
| CN209468794U (en) | One kind being used for tunnel foundation settlement measurement coefficient of subgrade reaction analyzer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |