CN107462492B - The anchor rod anchored research method of large dosage swelling agent is carried out for CT scan technology - Google Patents
The anchor rod anchored research method of large dosage swelling agent is carried out for CT scan technology Download PDFInfo
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- CN107462492B CN107462492B CN201710581911.1A CN201710581911A CN107462492B CN 107462492 B CN107462492 B CN 107462492B CN 201710581911 A CN201710581911 A CN 201710581911A CN 107462492 B CN107462492 B CN 107462492B
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- 238000002591 computed tomography Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011160 research Methods 0.000 title claims abstract description 25
- 230000008961 swelling Effects 0.000 title claims abstract description 25
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 239000011435 rock Substances 0.000 claims abstract description 106
- 239000002002 slurry Substances 0.000 claims abstract description 99
- 239000004568 cement Substances 0.000 claims abstract description 98
- 239000004067 bulking agent Substances 0.000 claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 19
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 230000010412 perfusion Effects 0.000 claims abstract description 12
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 239000011888 foil Substances 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 238000007586 pull-out test Methods 0.000 claims abstract description 3
- 238000012360 testing method Methods 0.000 claims description 31
- 230000007613 environmental effect Effects 0.000 claims description 19
- 238000004873 anchoring Methods 0.000 claims description 16
- 230000008859 change Effects 0.000 claims description 15
- 238000007654 immersion Methods 0.000 claims description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 13
- 239000004917 carbon fiber Substances 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 10
- 230000001360 synchronised effect Effects 0.000 claims description 10
- 239000003365 glass fiber Substances 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 10
- 239000003673 groundwater Substances 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003325 tomography Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N2009/022—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids
Abstract
The present invention relates to the methods for carrying out the anchor rod anchored research of large dosage swelling agent for CT scan technology, this method includes choosing rock material or rock-like materials, cutting material production country rock body simultaneously drills, arrange pressure sensor, arrange foil gauge, configure expansion cement slurry, the pressure data of different time after acquisition perfusion expansion cement slurry, the expansion cement slurry compression for drawing different bulking agent levels changes over time image, pull-out test step by step, solve the problems, such as that the presence of metal in CT scan produces bigger effect the CT value inside anchor system, the anchor system expansion cement slurry compression that more can really study under crustal stress and groundwater effect different bulking agent levels changes with time rule, the failure mode and Evolution at three main bodys, two interface under crustal stress and groundwater effect, it anchor axial force and cuts The regularity of distribution of stress finally obtains withdrawal resistance with the changing rule of bulking agent levels.
Description
Technical field
Utilize expanding cement that head is expanded substantially to carry out greatly for CT scan technology in aperture steel pipe the present invention relates to a kind of
The anchor rod anchored research method of volume swelling agent belongs to civil engineering experimental rig field.
Background technique
CT scan technology is a kind of lossless decomposition technology, because having convenient and efficient, highly-safe, result is visual in image etc.
Advantage has been widely studied and applied.CT scan can dynamically, quantitatively measure the change of material internal structure in loading process
Change, institute can intuitively embody the defect and breakage of interior of articles at image, and can be to defect and damaged progress quantitative analysis.CT
The working principle of scanning technique is to scan object to be detected from multiple directions using X ray under tested component nondestructive state
One tomography gets off the information collection after being detected object ray attenuation with special detector, by computer using special
The image reconstruction algorithm of door is shown scanned section in the form of two dimension or three dimensional grey scale image, detects direct result
It is exactly tested object faultage image.It can clearly reflect that tested object selectes the structure sheaf in tomography by this faultage image
Secondary, material situation has the inner cases such as zero defect.
In slope retaining protection, anchor system internal structure change in country rock body is analyzed using CT scan technology
It is of great significance to the steady in a long-term of anchor system under the conditions of research crustal stress and immersion, but due to the metal in anchor system
Ingredient is affected to CT scan, and institute can not accurately analyze the internal junction of anchor system at being easy to appear artifact in image
Structure variation.In current CT scan technical application, for that can simulate true crustal stress and groundwater condition and accurately survey
The internal structure change for determining anchor system, there are no find good method.
Summary of the invention
The anchor rod anchored research method of large dosage swelling agent is carried out provided by the present invention for CT scan technology, uses glass fibers
Tie up anchor pole replace anchor metal, with high-strength carbon fiber cloth package security against fire air cushion inflation replace metal component to rock around
Apply compression simulated ground stress, i.e., metal component is replaced with non-metallic member, solve the presence of metal in CT scan to anchor
Gu the problem of CT value of internal system produces bigger effect more can really be studied different under crustal stress and groundwater effect
The anchor system expansion cement slurry compression of bulking agent levels change with time rule, three under crustal stress and groundwater effect
It the failure mode and Evolution, anchor axial force at main body (anchor pole, anchoring body, country rock) two interfaces (interface between three main bodys) and cuts
The regularity of distribution of stress finally obtains withdrawal resistance with the changing rule of bulking agent levels, is slope retaining protection in Practical Project
Reference and research application value are provided.
First, rock mass anchor pole failure caused by the anti-pulling of anchor bar solved in rock mass is insufficient, and extraction-resistant behavior is lower.
Second, solve the long construction period of conventional anchor, the high problem of construction cost.
In order to realize above-mentioned technical characteristic, the object of the present invention is achieved like this: carrying out for CT scan technology big
The anchor rod anchored research method of volume swelling agent, which is characterized in that it the following steps are included:
Step1: rock material or rock-like materials are chosen；
Step2: cutting material makes multiple identical rock-like blocks or rocks test block, in each rock-like block
Or rocks test block center drills through cylinder bore, the rock-like block made or rocks test block is carried out CT scan, and record
Rock CT value, the rock CT value are the initial closely knit angle value before Rock experiment；
Step3: it in the different depth disposed at equal distance multiple groups pressure sensor group away from aperture, mutually hangs down in rock-like block two
10 pressure sensors are arranged in a manner of " four angle points, one central point " in straight sided, are made in the two sides of arrangement pressure sensor
It is wrapped up with high-strength carbon fiber cloth, the fixed security against fire hoisting air cushion of surrounding, inflation is with applying pressure to simulate under full-scale condition
Stress；
Step4: fixing identical non-metallic rock in each cylinder bore, and foil gauge is arranged on non-metallic rock, and
It is inserted into same depth；
Step5: the expansion cement slurry of multiple groups difference bulking agent levels, the group number and circle of different content expansion cement slurry are prepared
The quantity in cylinder hole is identical, and first into each hole, the progress of perfusion ordinary cement slurry is rebasing, then by the swollen of different bulking agent levels
Swollen cement slurry is injected separately into cylinder bore and by its vibration compacting, is finally sealed envelope using ordinary cement slurry in aperture
Mouthful, while record is numbered to each group test；
Multiple groups pressure sensor: connecting by Step6 with pressure acquisition system immediately after grouting, acquisition perfusion expansion cement slurry
The pressure data of different time afterwards, while, i.e. initial set before rock and expansion primary to the CT scan before grouted rock progress initial set
The CT value of slurry；Entire rock is soaked in water after initial set, it is intermediate to 28 days after initial set, each star is carried out to grouted rock
Phase primary CT scan, the CT value of synchronous recording pressure data and rock and expanding cement slurry, as the stage rock and swollen
The closely knit angle value of swollen cement slurry；
Step7: according to pressure data collected, the expansion cement slurry compression of different bulking agent levels is drawn at any time
Modified-image；Simultaneously according to the CT value of record draw different bulking agent levels rock and expanding cement slurry CT value at any time
The two modified-image is established corresponding relationship by modified-image in time, and research expanding cement slurry is swollen in true rock mass
Swollen mechanism and changing rule；
Step8: carrying out pull-out test step by step after expansion cement slurry final set, passes through CT scan, pressure acquisition system, strain
Acquisition system obtains data CT value, pressure data, strain data respectively, draws the expansion cement slurry of different bulking agent levels
CT value, pressure value, strain value change over time image, and analyze and obtain the anchor of the different bulking agent levels under real environmental conditions
Gu system changes over time rule, three main bodys and two interfacial failure modes and Evolution, bolt shaft under real environmental conditions
The regularity of distribution of power and shear stress finally obtains under real environmental conditions withdrawal resistance with the changing rule of bulking agent levels；
Three main body are as follows: anchor pole, anchoring body and rock mass or rocks body；
Two interface are as follows: two interfaces formed between anchor pole and anchoring body, between anchoring body and rock mass or rocks body.
In the Step1, select various rock mass as research object, rock-like materials are concrete casting.
Rock material is cut, 3 identical 300mm × 300mm × 300mm cube rock is made in this test
Sample block drills through a cylinder bore at each rock-like block center, and the diameter of cylinder bore is 40mm, depth 300mm；Cylinder
The quantity of body opening is 3；After the completion of drilling, CT scan is carried out to the rock-like block that will be made, and record rock CT value, it is described
Rock CT value is the initial closely knit angle value before Rock experiment, obtains the situation as before testing inside rock exemplar using this.
In 50mm, 150mm, 250mm depth disposed at equal distance multiple groups pressure sensor group away from top aperture, every group of pressure
Force snesor group is made of three pressure sensors being arranged on same depth section, in the same plane, three on section
A mutual angle of pressure sensor is 120 °；With the side of " four angle points and an intermediate point " in the mutual vertical side of rock-like block two
Formula arranges 10 pressure sensors；Surrounding is wrapped up using high-strength carbon fiber cloth in the two sides of arrangement pressure sensor, it is fixed
Security against fire hoisting air cushion, inflation applies nMPa pressure to simulate crustal stress under full-scale condition after carbon fiber rubber solidification.
Use bolt diameter for 20mm, length is the glass fibre anchor pole of 600mm, insertion depth 300mm, in insertion
300mm depth end is from bottom groove milling on anchor pole along axial direction, slot length 250mm, wide 5mm, depth 2mm, between equal in slot
Away from arrangement foil gauge.
The expansion cement slurry that bulking agent levels are respectively 15%, 25% and 35% is prepared, 25mm height is first perfused into each hole
Ordinary cement slurry progress is rebasing, and the expansion cement slurry of the different bulking agent levels of 250mm height is then perfused respectively in hole simultaneously
And by its vibration compacting, 25mm height ordinary cement slurry is finally perfused into each hole and is sealed.
The data time interval of acquisition are as follows: it is continued to monitor in first 2 hours after perfusion expansion cement slurry, in latter 24 hours,
Every the pressure data of acquisition in 2 hours；In 24 hours to 48 hours after expansion cement slurry is perfused, one was acquired every 6 hours
Secondary pressure data；It acquires a pressure data every three days backward, records data；The CT before initial set is carried out to grouted rock simultaneously
Run-down, i.e., the CT value of rock and expansion slurry before initial set；Entire rock is soaked in water after initial set, to 28 after initial set
It is intermediate, carries out grouted rock per CT scan once a week, synchronous recording pressure data and rock and expansion cement slurry
The CT value of body, i.e., the closely knit angle value of the rock and expanding cement slurry intermediate to 28 days after initial set.
According to pressure data collected, the expansion cement slurry compression for drawing different bulking agent levels changes over time figure
Picture；Simultaneously according to the pressure data and rock of record and the CT value of expanding cement slurry draw different bulking agent levels rock and
The CT value of expanding cement slurry changes over time image, and the two modified-image is established corresponding relationship, research expansion in time
Mechanism of intumescence and changing rule of the cement slurry in true rock mass.
Hydraulic jack is utilized after expansion cement slurry final set, and anchor pole is carried out step by step plus unloaded, when load reaches a certain
When grade, unloading processing is carried out, entire anchor system is placed on spiral CT machine together with security against fire hoisting air cushion and is scanned,
Simulative immersion condition is scanned after immersion container can be put into, synchronous to be adopted using pressure acquisition system and strain acquisition system
Collect pressure data and strain data, is re-loaded to lower level again later, then be scanned test, is so recycled to anchor pole and pulls out
Out, off-test, it is to obtain rock and swelling water in each grade loading procedure that CT scan is carried out after each unloading
Multiple compactness variation before and after slurry body；
Obtain data CT value, pressure data, strain data, draw the expansion cement slurry of different bulking agent levels CT value,
Pressure value, strain value change over time image, and analyze the anchor of available bulking agent levels different under real environmental conditions
Gu system changes over time rule, the shape between real environmental conditions lower bolt, anchoring body and three main body of soil mass and three main bodys
At two interfaces failure mode and Evolution, anchor axial force and shear stress the regularity of distribution, finally obtain in true environment
Under the conditions of withdrawal resistance with the changing rule of bulking agent levels, the true environment, which refers to, simulates different crustal stress and immersion item
Environment under part.
Wherein, it is previously mentioned the CT value that multiple CT scan obtains, including the initial CT value before Rock experiment described in Step2,
The CT value of rock and expansion slurry before expansion cement slurry is pre-hardening in Step6；It is intermediate per CT once a week to 28 days after initial set
The rock obtained and expanding cement slurry CT value are scanned, rock and the expansion of CT scan acquisition are carried out after unloading every time in Step8
All CT value drafting patterns can be shown rock mass before the expansion cement slurry of perfusion different content, filled by cement slurry CT value
It is intermediate to 28 days after initial set after note before expansion cement slurry initial set, the variation relation in drawing experimentation is carried out after initial set, simultaneously
Also it can get the variation relation of expanding cement slurry during this.
The method have the advantages that:
1, the method for carrying out the anchor rod anchored research of large dosage swelling agent provided by the present invention for CT scan technology, uses glass
Glass fiber anchor rod replaces anchor metal, replaces metal component to rock with high-strength carbon fiber cloth package security against fire air cushion inflation
Surrounding applies compression simulated ground stress, i.e., replaces metal component with non-metallic member, solve the presence of metal in CT scan
The problem of producing bigger effect to the CT value inside anchor system more can really be studied under crustal stress and groundwater effect
The anchor system expansion cement slurry compression of different bulking agent levels change with time rule, in crustal stress and groundwater effect
The failure mode at lower three main bodys, two interface and the regularity of distribution of Evolution, anchor axial force and shear stress, finally obtain withdrawal resistance
With the changing rule of bulking agent levels, reference and research application value are provided for slope retaining protection in Practical Project.
2, the device simulates the anchor rod anchored support conditions in true slope retaining protective environment completely, studies anchor pole resistance to plucking
Power under different environmental conditions with the changing rule of different bulking agent levels and under real environmental conditions three main bodys (anchor pole,
Anchoring body, soil mass) two interfaces (interface between three main bodys) failure mode and Evolution, anchor axial force and shear stress distribution
Rule；
3, in the Patent equipment, anchor metal is replaced using glass fibre anchor pole, wraps up fire-fighting with high-strength carbon fiber cloth
Safety air cushion inflation replaces metal component to compression simulated ground stress is applied around rock, i.e., replaces metal with non-metallic member
Component solves the problems, such as that the presence of metal in CT scan produces bigger effect the CT value inside anchor system；
4, the patent exploitation CT scan technology, pressure acquisition system, strain acquisition system, three are used in combination jointly, from
Internal stress, internal modification, each interfacial failure damage carry out monitored over time, and outside carries out application confining pressure, simulates in true ring
The truth under suspension roof support under the conditions of border, so that obtained data are authentic and valid, it is more accurate, meet practical application.
5, it can study under the conditions of crustal stress and underground immersion, changing rule of the withdrawal resistance with bulking agent levels, anchoring body
Interface normal stress, shear stress, axle power the regularity of distribution；
6, the device can be recycled, and structure is simple, and material is easy to get, easy to operate, substantially save experimentation cost and period, ring
Border remarkable benefit.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is overall schematic of the present invention；
Fig. 2 is the mutual vertical side pressure sensor layout drawing of rock mass two of the present invention；
Fig. 3 is 1-1 sectional view of the present invention；
In figure, non-metallic rock 1, expansion cement slurry anchoring body 2, rocks test block 3, security against fire hoisting air cushion 4, pressure
Sensor 5, high-strength carbon fiber cloth 6, security against fire hoisting air cushion blowing mouth 7, foil gauge 8, pressure sensor group 9.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
Embodiment one:
The device and application method of the anchor rod anchored research of large dosage swelling agent are carried out for CT scan technology, this method includes
Following steps:
Step1: selecting concrete test block is test material therefor；
Step2: 3 identical cube rocks test blocks are made using concreting, size is equal are as follows:
300mm×300mm×300mm；During being poured test block, a cylinder bore, circle are reserved at each rocks test block center
The diameter in cylinder hole is 40mm, depth 300mm；It is primary to rocks test block progress CT scan after 28 days, obtain rocks
CT value inside test block (CT value is closely knit angle value).
Step3: in 50mm, 150mm, 250mm depth disposed at equal distance multiple groups pressure sensor group away from top aperture,
Every group of pressure sensor group is made of three pressure sensors being arranged on same depth section, in the same plane, section
On three mutual angles of pressure sensor be 120 °；In the mutual vertical side of rock-like block two " among four angle points and one
The mode of point " arranges 10 pressure sensors；High-strength carbon fiber cloth package four is used in the two sides of arrangement pressure sensor
Week fixes security against fire hoisting air cushion, and inflation applies 1MPa pressure and answered under full-scale condition with simulating after carbon fiber rubber solidification
Power；
Step4: selection bolt diameter is 20mm, and length is the glass fibre anchor pole of 600mm, is inserted into rocks test block center
Kong Zhong, depth 300mm, insertion 300mm depth end from bottom groove milling on anchor pole along axial direction, slot length 250mm is wide
5mm, depth 2mm, is equally spaced foil gauge in slot.
Step5: electronic scale weighs the cement that 3 deck labels are 42.5, and weight is respectively 183.6g, 162g, 140.4g, claims
Taking weight is respectively the swelling agent of 32.4g, 34g, 75.6g, is weighed 3 groups of warm water (50 degrees centigrade), every group of 64.8g, successively
3 groups of cement, swelling agent and warm water are mixed, the expansion cement slurry that bulking agent levels are 15%, 25%, 35% is configured to.It connects down
It is rebasing first to be perfused 25mm height ordinary cement slurry into each hole, 250mm height is then perfused respectively into each hole again
25mm height ordinary cement is finally perfused in the expansion cement slurry of different bulking agent levels and by its vibration compacting into each hole
Slurry is sealed；
Step6: multiple groups pressure sensor group is connect with pressure acquisition system, when different after acquisition perfusion expansion cement slurry
Between pressure data, the data time interval of acquisition are as follows: perfusion expansion cement slurry after first 2 hours in continue to monitor, rear 24 is small
When it is interior, every the pressure data of acquisition in 2 hours；In 24 hours to 48 hours after expansion cement slurry is perfused, adopted every 6 hours
Collect a pressure data；It acquires a pressure data every three days backward, records data；Before carrying out initial set to grouted rock simultaneously
CT scan it is primary；Entire rock is soaked in water after initial set, it is intermediate to 28 days after initial set, grouted rock is carried out each
Week primary CT scan, (CT value is the compactness of rock and expanding cement slurry for synchronous recording pressure data and CT value
Value).
Step7: according to pressure data collected, the expansion cement slurry compression of different bulking agent levels is drawn at any time
Modified-image；The CT value for the expansion cement slurry for drawing different bulking agent levels according to the CT value of record simultaneously changes over time figure
The two modified-image is established corresponding relationship by picture in time, studies mechanism of intumescence of the expanding cement slurry in true rock mass
And changing rule.
In Step8, hydraulic jack is utilized after expansion cement slurry final set, and anchor pole is carried out step by step plus unloaded, load is worked as
When reaching a certain grade, unloading processing is carried out, entire anchor system is placed on spiral CT machine together with security against fire hoisting air cushion
Upper scanning (simulative immersion condition is scanned after can also being put into immersion container) is synchronous to use pressure acquisition system and strain acquirement
System is acquired pressure data and strain data, is re-loaded to lower level again later, then is scanned test, so follows
Ring to anchor pole is extracted, off-test.Data CT value, pressure data, strain data are obtained, the expansion of different bulking agent levels is drawn
The CT value of cement slurry, pressure value, strain value change over time image, and analyze available different swollen under real environmental conditions
The anchor system of swollen agent content changes over time rule, three main bodys (anchor pole, anchoring body, soil mass) two under real environmental conditions
The regularity of distribution of interface (interface between three main bodys) failure mode and Evolution, anchor axial force and shear stress, finally obtains
For withdrawal resistance with the changing rule of bulking agent levels, the true environment in the present invention, which refers to, simulates different ground under real environmental conditions
Under the conditions of stress and immersion.
Embodiment two:
For the method that CT scan technology carries out the anchor rod anchored research of large dosage swelling agent, method includes the following steps:
Step1: selecting rigid sandstone is test material therefor；
Step2: cutting rock material makes 3 identical 300mm × 300mm × 300mm cube rock-like
Block turns to take 1 cylinder bore at each rock-like block center, and the diameter of cylinder bore is 40mm, depth 300mm；Cylindrical body
The quantity in hole is 3；After the completion of drilling, CT scan is carried out to rock-like block that will make, and records CT value (CT value is rock
The closely knit angle value of stone).
Step3: in 50mm, 150mm, 250mm depth disposed at equal distance multiple groups pressure sensor group away from top aperture,
Every group of pressure sensor group is made of three pressure sensors being arranged on same depth section, in the same plane, section
On three mutual angles of pressure sensor be 120 °；In the mutual vertical side of rock-like block two " among four angle points and one
The mode of point " arranges 10 pressure sensors；High-strength carbon fiber cloth package four is used in the two sides of arrangement pressure sensor
Week fixes security against fire hoisting air cushion, and inflation applies 1.5MPa pressure and answered under full-scale condition with simulating after carbon fiber rubber solidification
Power；
Step4: selection bolt diameter is 20mm, and length is the glass fibre anchor pole of 600mm, is inserted into rocks test block center
Kong Zhong, depth 300mm, insertion 300mm depth end from bottom groove milling on anchor pole along axial direction, slot length 250mm is wide
5mm, depth 2mm, is equally spaced foil gauge in slot.
Step5: electronic scale weighs the cement that 3 deck labels are 42.5, and weight is respectively 183.6g, 162g, 140.4g, claims
Taking weight is respectively the swelling agent of 32.4g, 34g, 75.6g, is weighed 3 groups of warm water (50 degrees centigrade), every group of 64.8g, successively
3 groups of cement, swelling agent and warm water are mixed, the expansion cement slurry that bulking agent levels are 15%, 25%, 35% is configured to, connects down
It is rebasing that 25mm height ordinary cement slurry is first perfused into each hole, 250mm height is then perfused respectively not into each hole again
With bulking agent levels expansion cement slurry and by its vibration compacting, finally into each hole be perfused 25mm height ordinary cement slurry
It is sealed；
Step6: multiple groups pressure sensor group is connect with pressure acquisition system, when different after acquisition perfusion expansion cement slurry
Between pressure data, the data time interval of acquisition are as follows: perfusion expansion cement slurry after first 2 hours in continue to monitor, rear 24 is small
When it is interior, every the pressure data of acquisition in 2 hours；In 24 hours to 48 hours after expansion cement slurry is perfused, adopted every 6 hours
Collect a pressure data；It acquires a pressure data every three days backward, records data；Before carrying out initial set to grouted rock simultaneously
CT scan it is primary；Entire rock is soaked in water after initial set, it is intermediate to 28 days after initial set, grouted rock is carried out each
Week primary CT scan, (CT value is the compactness of rock and expanding cement slurry for synchronous recording pressure data and CT value
Value).
Step7: according to pressure data collected, the expansion cement slurry compression of different bulking agent levels is drawn at any time
Modified-image；The CT value for the expansion cement slurry for drawing different bulking agent levels according to the CT value of record simultaneously changes over time figure
The two modified-image is established corresponding relationship by picture in time, studies mechanism of intumescence of the expanding cement slurry in true rock mass
And changing rule.
In Step8, hydraulic jack is utilized after expansion cement slurry final set, and anchor pole is carried out step by step plus unloaded, load is worked as
When reaching a certain grade, unloading processing is carried out, entire anchor system is placed on spiral CT machine together with security against fire hoisting air cushion
Upper scanning (simulative immersion condition is scanned after can also being put into immersion container) is synchronous to use pressure acquisition system and strain acquirement
System is acquired pressure data and strain data, is re-loaded to lower level again later, then is scanned test, so follows
Ring to anchor pole is extracted, off-test.Data CT value, pressure data, strain data are obtained, the expansion of different bulking agent levels is drawn
The CT value of cement slurry, pressure value, strain value change over time image, and analyze available different swollen under real environmental conditions
The anchor system of swollen agent content changes over time rule, three main bodys (anchor pole, anchoring body, soil mass) two under real environmental conditions
The regularity of distribution of interface (interface between three main bodys) failure mode and Evolution, anchor axial force and shear stress, finally obtains
For withdrawal resistance with the changing rule of bulking agent levels, the true environment in the present invention, which refers to, simulates different ground under real environmental conditions
Under the conditions of stress and immersion.
Above-described embodiment is used to illustrate the present invention, rather than limits the invention, in spirit of the invention and
In scope of protection of the claims, to any modifications and changes that the present invention makes, protection scope of the present invention is both fallen within.
Claims (9)
1. carrying out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, which is characterized in that it includes following step
It is rapid:
Step1: rock material or rock-like materials are chosen；
Step2: cutting material makes multiple identical rock-like blocks or rocks test block (3), in each rock-like block or
Rocks test block (3) center drills through cylinder bore, and the rock-like block made or rocks test block (3) are carried out CT scan, and
Rock CT value is recorded, the rock CT value is the initial closely knit angle value before Rock experiment；
Step3: it in the different depth disposed at equal distance multiple groups pressure sensor group (9) away from aperture, mutually hangs down in rock-like block two
10 pressure sensors (5) are arranged in straight sided in a manner of " four angle points, one central point ", in the two sides of arrangement pressure sensor
Face is wrapped up using high-strength carbon fiber cloth (6), and surrounding is fixed security against fire hoisting air cushion (4), and it is true to simulate that inflation applies pressure
Crustal stress under reality condition；
Step4: fixing identical non-metallic rock (1) in each cylinder bore, arrange foil gauge (8) on non-metallic rock (1),
And it is inserted into same depth；
Step5: the expansion cement slurry of multiple groups difference bulking agent levels, the group number and cylindrical body of different content expansion cement slurry are prepared
The quantity in hole is identical, and first into each hole, the progress of perfusion ordinary cement slurry is rebasing, then by the swelling water of different bulking agent levels
Mud is injected separately into cylinder bore and by its vibration compacting, is finally sealed sealing using ordinary cement slurry in aperture,
Record is numbered to each group test simultaneously；
Multiple groups pressure sensor (5): connecting by Step6 with pressure acquisition system immediately after grouting, acquisition perfusion expansion cement slurry
The pressure data of different time afterwards, while, i.e. initial set before rock and expansion primary to the CT scan before grouted rock progress initial set
The CT value of slurry；Entire rock is soaked in water after initial set, it is intermediate to 28 days after initial set, each star is carried out to grouted rock
Phase primary CT scan, the CT value of synchronous recording pressure data and rock and expanding cement slurry, as the stage rock and swollen
The closely knit angle value of swollen cement slurry；
Step7: according to pressure data collected, the expansion cement slurry compression for drawing different bulking agent levels is changed over time
Image；The CT value of the rock and expanding cement slurry of drawing different bulking agent levels according to the CT value of record simultaneously changes over time
The two modified-image is established corresponding relationship by image in time, studies expanding machine of the expanding cement slurry in true rock mass
Reason and changing rule；
Step8: carrying out pull-out test step by step after expansion cement slurry final set, passes through CT scan, pressure acquisition system, strain acquirement
System, respectively obtain data CT value, pressure data, strain data, draw the expansion cement slurry of different bulking agent levels CT value,
Pressure value, strain value change over time image, and analyze and obtain the anchoring system of the different bulking agent levels under real environmental conditions
System change over time rule, under real environmental conditions three main bodys and two interfacial failure modes and Evolution, anchor axial force and
The regularity of distribution of shear stress finally obtains under real environmental conditions withdrawal resistance with the changing rule of bulking agent levels；
Three main body are as follows: anchor pole, anchoring body and rock mass or rocks body；
Two interface are as follows: two interfaces formed between anchor pole and anchoring body, between anchoring body and rock mass or rocks body.
2. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step1, selects various rock mass as research object, rock-like materials are concrete casting.
3. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step2, cut rock material, in this test make 3 identical 300mm × 300mm ×
300mm cube rock-like block drills through a cylinder bore at each rock-like block center, and the diameter of cylinder bore is 40mm,
Depth is 300mm；The quantity of cylinder bore is 3；After the completion of drilling, CT scan is carried out to the rock-like block that will be made, and
Rock CT value is recorded, the rock CT value is the initial closely knit angle value before Rock experiment, obtains the rock as before testing using this
Situation inside exemplar.
4. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step3, in 50mm, 150mm, 250mm depth disposed at equal distance multiple groups pressure sensing away from top aperture
Device group (9), every group of pressure sensor group (9) is made of three pressure sensors being arranged on same depth section, same
In plane, three mutual angles of pressure sensor on section are 120 °；With " quadrangle in the mutual vertical side of rock-like block two
The mode of point and an intermediate point " arranges 10 pressure sensors (5)；It is used in the two sides of arrangement pressure sensor (5) high-strength
It spends carbon cloth (6) and wraps up surrounding, fixed security against fire hoisting air cushion (4), inflation applies nMPa pressure after carbon fiber rubber solidification
Power is to simulate crustal stress under full-scale condition.
5. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step4, uses bolt diameter for 20mm, and length is the glass fibre anchor pole of 600mm, and insertion depth is
300mm, insertion 300mm depth end from bottom groove milling on anchor pole along axial direction, slot length 250mm, wide 5mm, depth is
2mm is equally spaced foil gauge (8) in slot.
6. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step5, the expansion cement slurry that bulking agent levels are respectively 15%, 25% and 35% is prepared, first into each hole
It is rebasing that the progress of 25mm height ordinary cement slurry is perfused, the different bulking agent levels of 250mm height are then perfused respectively in hole
25mm height ordinary cement slurry is finally perfused into each hole and is sealed for expansion cement slurry and by its vibration compacting.
7. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step6, the data time interval of acquisition are as follows: and it is continued to monitor in first 2 hours after perfusion expansion cement slurry,
Afterwards in 24 hours, every the pressure data of acquisition in 2 hours；In 24 hours to 48 hours after expansion cement slurry is perfused, every 6
Pressure data of hour acquisition；It acquires a pressure data every three days backward, records data；Grouted rock is carried out simultaneously
CT scan before initial set is primary, i.e., the CT value of rock and expansion slurry before initial set；Entire rock is soaked in water after initial set,
It is intermediate to 28 days after initial set, grouted rock is carried out per CT scan once a week, synchronous recording pressure data and rock and
The CT value of expanding cement slurry, i.e., the closely knit angle value of the rock and expanding cement slurry intermediate to 28 days after initial set.
8. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step7, according to pressure data collected, draws the expansion cement slurry compression of different bulking agent levels
Change over time image；Different swelling agents are drawn according to the CT value of the pressure data and rock of record and expanding cement slurry simultaneously
The rock of content and the CT value of expanding cement slurry change over time image, and the two modified-image is established to corresponding pass in time
Mechanism of intumescence and changing rule of the expanding cement slurry in true rock mass are studied by system.
9. according to claim 1 carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, special
Sign is, in the Step8, hydraulic jack is utilized after expansion cement slurry final set, and anchor pole is carried out step by step plus unloaded, works as lotus
When load reaches a certain grade, unloading processing is carried out, entire anchor system is placed on spiral CT together with security against fire hoisting air cushion
It is scanned on machine, simulative immersion condition is scanned after can also being put into immersion container, synchronous to be adopted using pressure acquisition system and strain
Collecting system is acquired pressure data and strain data, is re-loaded to lower level again later, then is scanned test, so
It is recycled to anchor pole extraction, off-test, it is to obtain the rock and swollen in each grade loading procedure that CT scan is carried out after unloading
Multiple compactness variation before and after swollen cement slurry；
Data CT value, pressure data, strain data are obtained, CT value, the pressure of the expansion cement slurry of different bulking agent levels are drawn
Value, strain value change over time image, and analyze the anchoring system of available bulking agent levels different under real environmental conditions
It unites and changes over time rule, formed between real environmental conditions lower bolt, anchoring body and three main body of soil mass and three main bodys
The regularity of distribution of the failure mode and Evolution at two interfaces, anchor axial force and shear stress, finally obtains in real environmental conditions
Lower withdrawal resistance with bulking agent levels changing rule, the true environment refers to simulate different crustal stress and immersion under the conditions of
Environment.
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| CN108051294B (en) * | 2017-11-06 | 2020-04-24 | 三峡大学 | Device and method for simulating rock mass anchoring under conditions of high ground stress and underground water |
| CN108169260B (en) * | 2017-12-28 | 2020-06-30 | 三峡大学 | Method for analyzing expansion mechanism of anchoring body with different content of expanding agent by CT scanning |
| CN109030340B (en) * | 2018-07-16 | 2021-02-19 | 三峡大学 | Self-expansion loading and unloading device and method |
| CN109211949B (en) * | 2018-09-30 | 2021-06-29 | 三峡大学 | Test method for measuring compactness of anchoring body and surrounding soil layer of expansive cement paste based on CT scanning |
| CN110359959B (en) * | 2019-06-19 | 2020-06-26 | 中国矿业大学 | Method for rapidly measuring gas content and advance stress of coal face |
| CN110296899B (en) * | 2019-07-11 | 2021-07-13 | 三峡大学 | Test method for researching rock creep by unpowered stress locking |
| CN111060400B (en) * | 2019-12-31 | 2022-04-19 | 三峡大学 | Device for testing extruding process of coral sand around expansion pile by CT (computed tomography) and using method |
| CN111735724B (en) * | 2020-06-23 | 2023-03-10 | 三峡大学 | Device and method for detecting creep stress of in-situ rock-soil body |
| CN112985989B (en) * | 2021-02-19 | 2022-08-30 | 三峡大学 | Verification device and method for load platform effect of self-expansion anchoring system |
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| CN104155176A (en) * | 2014-08-28 | 2014-11-19 | 中国电建集团中南勘测设计研究院有限公司 | Simulation test device and method for working state of anchor rod and anchor rod stress meter |
| CN105509934B (en) * | 2016-01-27 | 2018-03-16 | 三峡大学 | A kind of method for measuring expansion cement slurry expansion compression |
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Application publication date: 20171212 Assignee: Hubei Hongzhuo Architectural Design Co.,Ltd. Assignor: CHINA THREE GORGES University Contract record no.: X2023980043461 Denomination of invention: Research method for anchoring anchor bolts with high volume expansion agent using CT scanning technology Granted publication date: 20190712 License type: Exclusive License Record date: 20231019 |
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