CN109916728A - Based on the country rock tangential stress flat jack observation device and method for stablizing regurgitant volume - Google Patents
Based on the country rock tangential stress flat jack observation device and method for stablizing regurgitant volume Download PDFInfo
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- CN109916728A CN109916728A CN201910204310.8A CN201910204310A CN109916728A CN 109916728 A CN109916728 A CN 109916728A CN 201910204310 A CN201910204310 A CN 201910204310A CN 109916728 A CN109916728 A CN 109916728A
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Abstract
The present invention provides a kind of based on the country rock tangential stress flat jack observation device and method of stablizing regurgitant volume, the stress trajectory device includes flat jack stress meter, pressure converter, high-pressure oil pump, pressure-detecting device, the flat jack stress meter is used to be mounted in the good rock mass rock seam of pre-production, the flat jack stress meter is connected with high-pressure oil pump, and the pressure duct between the flat jack stress meter and the high-pressure oil pump is equipped with pressure converter；The high-pressure oil pump is used to carry out precompressed to flat jack stress meter, it is also used to apply pressure to pressure converter, generating pressure converter under pressure pushes the pressure piston in pressure converter mobile, by pressure-detecting device measurement, the reflux of stablizing of pressure converter determines pressure value under certain pressure effect, and the pressure value by observing different times is the country rock tangential stress changing value that can determine the rock mass position.The country rock tangential stress observation method is easy to operate, and is not influenced by rock mass parameter.
Description
Technical field
It is specifically a kind of based on the country rock tangential stress for stablizing regurgitant volume the present invention relates to rock mechanics experiment technical field
Flat jack observation device and method.
Background technique
Stress test method is because test basic principle is different and different demands, and have his own strong points trend.In reality, generate ground
The reason of stress be it is sufficiently complex, to understand that all factors are still had any problem.But itself with regard to rock mass engineering project construction, engineering
The main source of crustal stress is rock mass self weight and various tectonic movements in rock mass, and the work for surveying crustal stress has directly
It connects, important meaning.With the progress of measuring technology, the theory of testing and modern science and technology, in-situ stress mensuration method and skill in the world
Art has hundreds of.Two major classes can substantially be divided according to the different criteria for classifying, from measurement content on can be divided into absolute value measurement and
Relative value measurement, and the direct method of measurement and the indirect method of measurement can be divided into according to absolute value basic principle of measurement.
Stress trajectory is mainly to measure the stress state of different times rock mass, belongs to the measurement of stress relative value.And it is traditional
Relative stress survey method belongs to stress indirect measurement method, requires that the participations such as the elasticity mechanics parameter of rock mass calculate.It is special
It is not during cavern excavation, the elasticity mechanics parameter of rock mass is varied with excavation progress, therefore, the stress variation of observation
Value error has considerable influence with the elasticity mechanics parameter value error of rock mass；Rock mass elasticity mechanics parameter value inaccuracy,
So as to cause the inaccuracy of stress trajectory value.
Summary of the invention
The contents of the present invention are a kind of based on the country rock tangential stress flat jack observation device and method of stablizing regurgitant volume, are belonged to
In a kind of direct method of measurement of stress trajectory, solution is the pass not influenced by rock mass parameter in country rock tangential stress observation process
Key technology problem.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
It is a kind of based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, including flat jack stress meter, pressure
Converter, high-pressure oil pump, pressure-detecting device, the flat jack stress meter are used to be mounted on the good rock mass rock seam of pre-production
Interior, the flat jack stress meter is connected with high-pressure oil pump, the high-voltage tube between the flat jack stress meter and the high-pressure oil pump
Road is equipped with pressure converter；The high-pressure oil pump is used to carry out precompressed to flat jack stress meter, is also used to pressure converter
Apply pressure, generates pressure converter under pressure and push the pressure piston in pressure converter mobile, by described
Pressure-detecting device measurement reflux of stablizing of pressure converter under certain pressure effect determines pressure value.
Further, the pressure converter includes cabinet and pressure piston, return pipe, locating shaft in cabinet,
Locating shaft is set to vertically in the interior bottom wall of cabinet, and return pipe is penetrated from the interior bottom wall of cabinet and is arranged in parallel afterwards with locating shaft,
Pressure piston sliding is set to the top of locating shaft and return pipe；The cabinet be located at pressure piston upper space be equipped with it is hydraulic
The flat jack stress meter communicating pipe of stress meter connection is rested the head on, the lower space that the cabinet is located at pressure piston is equipped with and high-pressure oil pump
The pressure converter forcing pipe of connection, return pipe are connect by high-pressure oil pipe with high-pressure oil pump.
Further, the return pipe is the tubular structure that top seals inner hollow, and upper part is equipped with and is connected to inner cavity
Through-hole, pressure piston can pass through through-hole when moving up along return pipe, locating shaft.
Further, the through-hole aperture area of section and equal with return pipe area of section.
Further, the pressure converter further includes between the top of pressure piston and the inner wall top of cabinet
Spring.
Further, the pressure converter further includes spring central spindle, the top of spring central spindle and the inner wall top of cabinet
Fixed, spring is set in spring shaft core periphery.
Further, the pressure-detecting device is set on the pressure duct between the forcing pipe and high-pressure oil pump.
Further, the pressure-detecting device is pressure sensor or pressure gauge, and the pressure sensor is adopted with data
Collect instrument to be connected.
Further, flat jack stress meter is connected by a pressure pipeline and a return line with high-pressure oil pump,
Wherein pressure pipeline is equipped with the first adjustable flow valve, pressure sensor, pressure gauge, and return line is equipped with the second adjustable flow
Valve, pressure sensor, pressure gauge are connected with data collecting instrument；Pressure duct between forcing pipe and high-pressure oil pump is equipped with third
Adjustable flow valve, the high-pressure oil pipe between return pipe and high-pressure oil pump are equipped with the 4th adjustable flow valve, flow sensor, flow
Sensor is connected with data collecting instrument.
It is a kind of based on the country rock tangential stress flat jack observation method for stablizing regurgitant volume, use above-mentioned apparatus to carry out, institute
The method of stating includes the following steps:
Step 1: flat jack stress meter is mounted in the good rock mass rock seam of pre-production；
Step 2: flat jack stress meter is fixed on rock mass rock seam with mortar concrete similar in Modulus of Elasticity of Rock Mass
It is interior；
Step 3: it carries out carrying out precompressed, precompressed to flat jack stress meter using high-pressure oil pump after mortar concrete initial set
Value is arranged according to the initial tangential stress value estimated, to precompressed after, should close first be connected to flat jack stress meter can
Flow valve, the second adjustable flow valve are adjusted, makes to keep certain precompressed value inside flat jack stress meter；
Step 4: determine tangential stress initial value: the high-pressure oil pump of starting test compression system pressurizes, and pressure passes through
Forcing pipe enters pressure converter, acts on the pressure piston in pressure converter, and pressure piston is under pressure toward pressure
Mobile equipped with spring direction in force transducer, when pressure piston moves to the lead to the hole site on return pipe, pressure converter adds
Pressure inner cavity is connected to return pipe, and return pipe starts to flow back；Pressurization flow, pressure conversion are increased by adjusting third adjustable flow valve
With increase, pressure piston continues into pressure converter equipped with the movement of spring direction, until pressure the pressure of device pressurization inner cavity
Piston is moved to the top of spring central spindle, and return pipe occurs stablizing reflux at this time, is kept for certain stabilization time, and writes down described
Pressure-detecting device at this time institute's measuring pressure value as tangential stress initial value；
Step 5: tangential stress observation experiment: step is identical as step 4, and the pressure value write down is observed as tangential stress
Value, the difference between tangential stress observation and tangential stress initial value is exactly the changing value of tangential stress, passes through different times
The measurement of tangential stress observation can measure the changing value of tangential stress.
The present invention can measure the same test position same direction upper stress state change of different times, when need to only observe different
Phase carries out pressure value when stress flat jack stablizes regurgitant volume measurement test, the observed pressure value of different times and initial pressure
The difference of force value is exactly the stress variation value of the test position, so as to avoid conventional method because rock mass parameter value inaccuracy is led
Cause the inaccuracy of stress trajectory value；Meanwhile the stress trajectory method is easy to operate.
Detailed description of the invention
Fig. 1 is that the present invention is a kind of based on the one of implementation of country rock tangential stress flat jack observation device for stablizing regurgitant volume
The structural schematic diagram of example；
Fig. 2 is the structural schematic diagram of pressure converter in one embodiment of the invention.
In figure: 1-high-pressure oil pump, 2-data collecting instruments, 3-flow sensors, 4-pressure gauges, 5-1-first pressure
Sensor, 5-2-second pressure sensor, 6-pressure converters, the first adjustable flow of 7-1-valve, the adjustable stream of 7-2-second
Measure valve, 7-3-third adjustable flow valve, the 4th adjustable flow valve of 7-4-, 8-flat jack stress meters, 9-mortar concretes,
10-rock mass, 6-1-pressure converter forcing pipe, 6-2-locating shaft, 6-3-cabinet, 6-4-sealing ring, 6-5-pressure are living
Plug, 6-6-through-hole, 6-7-return pipe, 6-8-spring, 6-9-spring central spindle, 6-10-flat jack stress meter communicating pipe.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, the technical solution in the present invention is clearly and completely described.
With reference to Fig. 1, the present invention provide it is a kind of based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, including
Flat jack stress meter 8, pressure converter 6, high-pressure oil pump 1, pressure sensor, data collecting instrument 2 etc..
As shown in Fig. 2, the pressure converter 6 includes cabinet 6-3 and the pressure piston 6-5 in cabinet 6-3, reflux
Pipe 6-7, locating shaft 6-2, spring 6-9, spring central spindle 6-8.Locating shaft 6-2 is set to vertically in the interior bottom wall of cabinet 6-3, reflux
Pipe 6-7 is penetrated from the interior bottom wall of cabinet 6-3 and is arranged in parallel afterwards with locating shaft 6-2, and pressure piston 6-5 sliding is set to locating shaft 6-
The top of 2 and return pipe 6-7, i.e. pressure piston 6-5 can be moved up and down along return pipe 6-7, locating shaft 6-2.Locating shaft 6-2's is upper
Portion is equipped with limiting section, such as ladder-like boss, for limiting to pressure piston 6-5, prevents pressure piston 6-5 from continuing downward
It is mobile.Pressure piston 6-5 positioned at intervals axis 6-2 certain distance is equipped with limit hole vertically, and return pipe 6-7 is out of cabinet 6-3
Portion's bottom wall stretches out after penetrating from the limit hole.
The upper space that the cabinet 6-3 is located at pressure piston 6-5 is equipped with the flat jack being connected to flat jack stress meter 8 and answers
Power meter communicating pipe 6-10.The lower space that the cabinet 6-3 is located at pressure piston 6-5 is equipped with the pressure being connected to high-pressure oil pump 1
Converter forcing pipe 6-1.The return pipe 6-7 is the tubular structure that top seals inner hollow, and upper part is equipped with to be connected with inner cavity
Logical through-hole 6-6, pressure piston 6-5 can pass through through-hole 6-6, through-hole when moving up along return pipe 6-7, locating shaft 6-2
The aperture 6-6 area of section and equal with return pipe 6-7 area of section, it is therefore an objective to be formed and stablize reflux.The bottom of the return pipe 6-7
Portion's opening is connected to by pipeline with the refluxing opening of high-pressure oil pump 1.
It is equipped with spring 6-9 between at the top of the top of pressure piston 6-5 and the inner wall of cabinet 6-3, spring 6-9 is set in spring
The periphery central spindle 6-8, the top of spring central spindle 6-8 and the inner wall top of cabinet 6-3 are fixed.It can be subtracted by the effect of spring 6-9
The few inertia motion of pressure piston 6-5 under pressure.
Pressure piston 6-5 in the pressure converter 6 and cabinet 6-3 inner wall, locating shaft 6-2, between return pipe 6-7
Equipped with sealing ring 6-4.Keep flat jack stress meter 8 and pressurizing device completely isolated by the sealing ring 6-4 on pressure piston 6-5.
Flat jack stress meter 8 passes through two pressure ducts (pressure pipeline and a return line) and high-pressure oil pump 1
It is connected, main purpose is to carry out precompressed to flat jack stress meter 8.Wherein pressure pipeline be equipped with the first adjustable flow valve 7-1,
Pressure sensor 5-1, pressure gauge 4-1, return line are equipped with the second adjustable flow valve 7-2, pressure sensor 5-1, pressure gauge
4-1 is connected with data collecting instrument 2.The forcing pipe 6-1 of pressure converter 6 is connect by pressure duct with high-pressure oil pump 1, forcing pipe
Pressure duct between 6-1 and high-pressure oil pump 1 is equipped with third adjustable flow valve 7-3, pressure sensor 5-2, pressure gauge 4-2,
Pressure sensor 5-2 is connected with data collecting instrument 2；The return pipe 6-7 of pressure converter 6 passes through high-pressure oil pipe and high-pressure oil pump 1
Connection, the high-pressure oil pipe between return pipe 6-7 and high-pressure oil pump 1 are equipped with the 4th adjustable flow valve 7-4, flow sensor 3, stream
Quantity sensor 3 is connected with data collecting instrument 2.
The working principle of the observation device are as follows:
The high-pressure oil pump 1 is used to carry out precompressed to flat jack stress meter 8 by two pressure ducts, since flat jack is answered
Power meter 8 with pressure converter 6 by being connected flat jack stress meter communicating pipe 6-10, when 8 surface of flat jack stress meter is by one
Under rock mass tangential stress increment Delta P effect, flat jack stress meter 8 passes through its hydraulic pressure transfer into pressure converter 6, and acts on
On pressure piston 6-5, pressure piston 6-5 is mobile to the pressurization of pressure converter 6 inner cavity under Δ P effect.By high-pressure oil pump 1,
Pressure converter forcing pipe 6-1 pressurizes to the pressurization of converter 6 inner cavity, at the beginning of pressure piston 6-5 is back to it under pressure
Beginning position, until the pressure at the both ends pressure piston 6-5 reaches balance, return pipe 6-7 forms stable reflux, the pressure observed at this time
Force value (pressure sensor 5-2 institute's measured value or pressure gauge 4-2 show value) is tangential stress observation, observation and initial value
Difference be the position tangential stress changing value.
The present invention can measure the changing value of tangential stress by the measurement of the tangential stress observation of different times, main
It is to solve the key technical problem not influenced by rock mass parameter in country rock tangential stress observation process, the stress trajectory method
It is easy to operate.
The present invention also provides a kind of based on the country rock tangential stress flat jack observation method for stablizing regurgitant volume, uses above-mentioned
Device carries out, and described method includes following steps:
Step 1: firstly, flat jack stress meter 8 is mounted in good 10 rock of the rock mass seam of pre-production, flat jack stress meter
8 are connected by two pressure ducts (pressure pipeline and a return line) with high-pressure oil pump 1, and main purpose is to liquid
Pressure pillow stress meter 8 carries out precompressed.Wherein pressure pipeline is equipped with the first adjustable flow valve 7-1, pressure sensor 5-1, pressure gauge
4-1, return line are equipped with the second adjustable flow valve 7-2, pressure sensor 5-1, pressure gauge 4-1 and are connected with data collecting instrument 2；
Flat jack stress meter 8 is connected to flat jack stress meter communicating pipe 6-10.The forcing pipe 6-1 of pressure converter 6 passes through pressure duct
It is connect with high-pressure oil pump 1, the pressure duct between forcing pipe 6-1 and high-pressure oil pump 1 is equipped with third adjustable flow valve 7-3 and pressure
Force snesor 5-2, pressure gauge 4-2, pressure sensor 5-2, pressure gauge 4-2 are connected with data collecting instrument 2；Pressure converter 6
Return pipe 6-7 is connect by high-pressure oil pipe with high-pressure oil pump 1, and the high-pressure oil pipe between return pipe 6-7 and high-pressure oil pump 1 is equipped with
4th adjustable flow valve 7-4, flow sensor 3, the 4th adjustable flow valve 7-4, flow sensor 3 are connected with data collecting instrument 2.
Step 2: flat jack stress meter 8 being fixed on 10 rock of rock mass with mortar concrete 9 similar in Modulus of Elasticity of Rock Mass
In seam.
Step 3: due to being influenced by 9 heat of hydration of mortar concrete after flat jack stress meter 8 is embedded, should be carried out after initial set
Precompressed, precompressed are carried out by high-pressure oil pump 1；Precompressed value is arranged according to the initial tangential stress value estimated, to precompressed after, answer
The first adjustable flow valve 7-1, the second adjustable flow valve 7-2 being connected to flat jack stress meter 8 are closed, flat jack stress meter 8 is made
Inside keeps certain precompressed value.
Step 4: the determination of initial value is as follows: the high-pressure oil pump 1 of starting test compression system pressurizes, and pressure is by adding
Pressure pipe 6-1 enters pressure converter 6, acts on the pressure piston 6-5 in pressure converter 6, and pressure piston 6-5 makees in pressure
The movement of the direction spring 6-8 is housed into pressure converter 6 with lower.When pressure piston 6-5 moves to the through-hole 6- on return pipe 6-7
When 6 position, the pressurization of pressure converter 6 inner cavity is connected to return pipe 6-7, and return pipe 6-7 starts to flow back；It is adjustable by adjusting third
Flow valve 7-3 increases pressurization flow, and with increase, pressure piston 6-5 continues toward pressure the pressure of the pressurization of pressure converter 6 inner cavity
It is mobile equipped with the direction spring 6-8 in converter 6, until pressure piston 6-5 is moved to top (the i.e. return pipe of spring central spindle 6-8
The through-hole 6-6 of 6-7 is all connected to the pressurization of pressure converter 6 inner cavity), return pipe 6-7 occurs stablizing reflux (stable reflux at this time
It can be determined according to the through-hole 6-6 latus rectum of return pipe 6-7, i.e. the pressurization chamber pressure of pressure converter 6 and 8 inner cavity of flat jack stress meter
Pressure reaches balance, and pressure value at this time is as tangential stress initial value), kept for certain stabilization time (should be 1min with
On), and the pressure value is write down as tangential stress initial value, this pressure value can be surveyed by pressure sensor 5-2 or pressure gauge 4-2
It is fixed.
Step 5: tangential stress observation experiment step is the same as step 4.The pressure value write down is as tangential stress observation；It cuts
It is exactly the changing value of tangential stress to the difference between stress trajectory value and tangential stress initial value.Pass through the tangential of different times
The measurement of stress trajectory value can measure the changing value of tangential stress.After the completion of each tangential stress observation experiment, it should all close
Third adjustable flow valve 7-3, the 4th adjustable flow valve 7-4 are closed, and makes to keep certain pressure in the pressurization of pressure converter 6 inner cavity
(pressure value that its pressure value should be lower than flat jack stress meter 8).
The tangential stress that the method for the present invention is suitable for all kinds of rock mass is observed, and the measurement of stress relative value is belonged to.Tangential stress is seen
Pressure value when different times progress stress flat jack stablizes regurgitant volume measurement test need to be only observed during surveying, and belonged to and answered
A kind of direct method of measurement of power observation.And stress trajectory method traditional at present belongs to stress indirect measurement method, requires
The participations such as the elasticity mechanics parameter of different times rock mass calculate；Especially during cavern excavation, the elasticity mechanics parameter of rock mass
It is varied with excavation progress, the stress variation value error of observation has quite big with the elasticity mechanics parameter value error of rock mass
Influence；Rock mass elasticity mechanics parameter value inaccuracy, so as to cause the inaccuracy of stress trajectory value.And the method for the present invention only needs
Observe pressure value when different times progress stress flat jack stablizes regurgitant volume measurement test, the observed pressure of different times
Value and the difference of initial pressure value are exactly the stress variation value of the test position, belong to a kind of direct method of measurement of stress trajectory, from
And conventional method is avoided because of the inaccuracy of stress trajectory value caused by rock mass parameter value inaccuracy；Meanwhile the stress trajectory
Method is easy to operate.
The content that this specification is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that: answered including flat jack
Power meter (8), pressure converter (6), high-pressure oil pump (1), pressure-detecting device, the flat jack stress meter (8) is for being mounted on
In pre-production good rock mass (10) rock seam, the flat jack stress meter (8) is connected with high-pressure oil pump (1), and the flat jack is answered
Pressure duct between power meter (8) and the high-pressure oil pump (1) is equipped with pressure converter (6)；The high-pressure oil pump (1) is used for
Precompressed is carried out to flat jack stress meter (8), is also used to apply pressure to pressure converter (6), makes pressure converter (6) in pressure
Lower generate of effect pushes the pressure piston of (6) in pressure converter mobile, is measured by the pressure-detecting device in a level pressure
The reflux of stablizing that power acts on lower pressure converter (6) determines pressure value.
2. as described in claim 1 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
The pressure converter (6) includes cabinet (6-3) and the pressure piston (6-5) being set in cabinet (6-3), return pipe (6-7), determines
Position axis (6-2), for locating shaft (6-2) vertically in the interior bottom wall of cabinet (6-3), return pipe (6-7) is interior from cabinet (6-3)
Portion's bottom wall is arranged in parallel after penetrating with locating shaft (6-2), and pressure piston (6-5) sliding is set to locating shaft (6-2) and return pipe (6-
7) top；The upper space that the cabinet (6-3) is located at pressure piston (6-5), which is equipped with, to be connected to flat jack stress meter (8)
Flat jack stress meter communicating pipe (6-10), the lower space that the cabinet (6-3) is located at pressure piston (6-5) is equipped with and high pressure oil
The pressure converter forcing pipe (6-1) of (1) connection is pumped, return pipe (6-7) is connect by high-pressure oil pipe with high-pressure oil pump (1).
3. as claimed in claim 2 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
The return pipe (6-7) is the tubular structure that top seals inner hollow, and upper part is equipped with the through-hole (6-6) being connected to inner cavity,
Pressure piston (6-5) can pass through through-hole (6-6) when moving up along return pipe (6-7), locating shaft (6-2).
4. as claimed in claim 3 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
Through-hole (6-6) the aperture area of section and equal with return pipe (6-7) area of section.
5. as claimed in claim 2 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
The pressure converter (6) further includes the spring between the top of pressure piston (6-5) and the inner wall top of cabinet (6-3)
(6-9)。
6. as claimed in claim 5 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
The pressure converter (6) further includes spring central spindle (6-8), the top of spring central spindle (6-8) and the inner wall top of cabinet (6-3)
Fixed, spring (6-9) is set in spring central spindle (6-8) periphery.
7. as claimed in claim 2 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
The pressure-detecting device is set on pressure duct between the forcing pipe (6-1) and high-pressure oil pump (1).
8. as claimed in claim 7 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
The pressure-detecting device is pressure sensor or pressure gauge, and the pressure sensor is connected with data collecting instrument (2).
9. as claimed in claim 2 based on the country rock tangential stress flat jack observation device for stablizing regurgitant volume, it is characterised in that:
Flat jack stress meter (8) is connected by a pressure pipeline and a return line with high-pressure oil pump (1), wherein pressure pipeline
It is equipped with the first adjustable flow valve (7-1), pressure sensor (5-1), pressure gauge (4-1), it is adjustable that return line is equipped with second
Flow valve (7-1), pressure sensor (5-1), pressure gauge (4-1) are connected with data collecting instrument (2)；Forcing pipe (6-1) and high pressure
Pressure duct between oil pump (1) is equipped with third adjustable flow valve (7-3), between return pipe (6-7) and high-pressure oil pump (1)
High-pressure oil pipe is equipped with the 4th adjustable flow valve (7-4), flow sensor (3), flow sensor (3) and data collecting instrument (2)
It is connected.
10. a kind of based on the country rock tangential stress flat jack observation method for stablizing regurgitant volume, it is characterised in that use claim
Any one of 1-9 described device carries out, and described method includes following steps:
Step 1: flat jack stress meter (8) is mounted in pre-production good rock mass (10) rock seam；
Step 2: flat jack stress meter (8) is fixed on rock mass (10) with mortar concrete similar in Modulus of Elasticity of Rock Mass (9)
In rock seam；
Step 3: carrying out carrying out precompressed to flat jack stress meter (8) using high-pressure oil pump (1) after mortar concrete (9) initial set,
Precompressed value is arranged according to the initial tangential stress value estimated, to precompressed after, should close and be connected to flat jack stress meter (8)
First adjustable flow valve (7-1), the second adjustable flow valve (7-2) make to keep certain precompressed inside flat jack stress meter (8)
Value；
Step 4: determine tangential stress initial value: the high-pressure oil pump (1) of starting test compression system pressurizes, and pressure passes through
Forcing pipe (6-1) enters pressure converter (6), acts on the pressure piston (6-5) in pressure converter (6), pressure piston
(6-5) is mobile equipped with the spring direction (6-8) into pressure converter (6) under pressure, when pressure piston (6-5) moves to
When position through-hole (6-6) on return pipe (6-7), pressure converter (6) pressurization inner cavity is connected to return pipe (6-7), return pipe
(6-7) starts to flow back；Pressurization flow is increased by adjusting third adjustable flow valve (7-3), pressure converter (6) pressurization inner cavity
With increase, pressure piston (6-5) continues into pressure converter (6) equipped with the movement of the spring direction (6-8), until pressure pressure
Piston (6-5) is moved to the top of spring central spindle (6-8), and return pipe (6-7) occurs stablizing reflux at this time, keeps certain stabilization
Time, and write down the pressure-detecting device at this time institute's measuring pressure value as tangential stress initial value；
Step 5: tangential stress observation experiment: step is identical as step 4, the pressure value write down as tangential stress observation,
Difference between tangential stress observation and tangential stress initial value is exactly the changing value of tangential stress, passes through cutting for different times
The changing value of tangential stress can be measured to the measurement of stress trajectory value.
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| CN201910204310.8A CN109916728B (en) | 2019-03-18 | 2019-03-18 | Surrounding rock tangential stress hydraulic ram observation device and method based on stable backflow amount |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910204310.8A CN109916728B (en) | 2019-03-18 | 2019-03-18 | Surrounding rock tangential stress hydraulic ram observation device and method based on stable backflow amount |
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| CN109916728B CN109916728B (en) | 2021-04-23 |
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