CN107462492A - 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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- CN107462492A CN107462492A CN201710581911.1A CN201710581911A CN107462492A CN 107462492 A CN107462492 A CN 107462492A CN 201710581911 A CN201710581911 A CN 201710581911A CN 107462492 A CN107462492 A CN 107462492A
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- 238000002591 computed tomography Methods 0.000 title claims abstract description 49
- 238000011160 research Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008961 swelling Effects 0.000 title claims abstract description 27
- 238000005516 engineering process Methods 0.000 title claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 106
- 239000002002 slurry Substances 0.000 claims abstract description 96
- 239000004568 cement Substances 0.000 claims abstract description 94
- 239000004067 bulking agent Substances 0.000 claims abstract description 47
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 19
- 230000010412 perfusion Effects 0.000 claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 239000011888 foil Substances 0.000 claims abstract description 8
- 238000007586 pull-out test Methods 0.000 claims abstract description 3
- 230000008859 change Effects 0.000 claims description 23
- 230000007613 environmental effect Effects 0.000 claims description 21
- 238000004873 anchoring Methods 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 16
- 238000007654 immersion Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 13
- 239000004917 carbon fiber Substances 0.000 claims description 13
- 238000002474 experimental method Methods 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 13
- 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 8
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 239000002689 soil Substances 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 4
- 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
- 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
- 239000002184 metal Substances 0.000 abstract description 9
- 239000003673 groundwater Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011083 cement mortar Substances 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 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
- 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 method that the anchor rod anchored research of large dosage swelling agent is carried out for CT scan technology,This method includes choosing rock material or rock-like materials,Cutting material makes country rock body and drilled,Arrange pressure sensor,Arrange foil gauge,Configure expansion cement slurry,The pressure data of different time after collection perfusion expansion cement slurry,The expansion cement slurry compression for drawing different bulking agent levels changes over time image,The step such as pull-out test step by step,The presence for solving the problems, such as metal in CT scan produces considerable influence to the CT values inside anchor system,The anchor system expansion cement slurry compression that more can truly study the different bulking agent levels under crustal stress and groundwater effect changes with time rule,The failure mode and Evolution at the interface of three main body two under crustal stress and groundwater effect,The regularity of distribution of anchor axial force and shear stress,Finally give changing rule of the withdrawal resistance with bulking agent levels.
Description
Technical field
Utilize expanding cement to expand head in perforate steel pipe the present invention relates to one kind to carry out greatly to be significantly used for CT scan technology
The anchor rod anchored research method of volume swelling agent, belong to civil engineering experimental rig field.
Background technology
CT scan technology is a kind of lossless decomposition technology, because having convenient and swift, safe, result is visual in image etc.
Advantage, it has been widely studied and applied.CT scan can dynamically, quantitatively measure the change of material internal structure in loading process
Change, institute into image can intuitively embody interior of articles the defects of and breakage, and to defect and damaged can carry out quantitative analysis.CT
The operation principle of scanning technique is under tested component nondestructive state, and object to be detected is scanned from multiple directions using X rays
One tomography, the information gathering after being detected object ray attenuation is got off with special detector, by computer using special
The image reconstruction algorithm of door, scanned section is shown in the form of two dimension or three dimensional grey scale image, it 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, there are 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
To under the conditions of research crustal stress and immersion anchor system it is steady in a long-term significant, but due to the metal in anchor system
Composition has a great influence to CT scan, and institute can not accurately analyze the internal junction of anchor system into easily there is artifact in image
Structure changes.In current CT scan technology application, for that can simulate true crustal stress and groundwater condition, and can is accurately surveyed
Determine the internal structure change of anchor system, do not find good method also.
The content 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
Dimension anchor pole replace anchor metal, with high-strength carbon fiber cloth wrap up security against fire air cushion inflation replace hardware to rock around
Apply compression simulated ground stress, i.e., hardware is replaced with non-metallic member, solve the presence of metal in CT scan to anchor
Gu the CT values of internal system produce the problem of considerable influence, more can truly study 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
Main body（Anchor pole, anchoring body, country rock）Two interfaces（Interface between three main bodys）Failure mode and Evolution, anchor axial force and cut
The regularity of distribution of stress, changing rule of the withdrawal resistance with bulking agent levels is finally given, be that slope retaining protects in Practical Project
Reference and research application value are provided.
First, solve the anti-pulling of anchor bar deficiency in rock mass, rock mass anchor pole failure caused by extraction-resistant behavior is relatively low.
Second, solve the long construction period of traditional conventional anchor, the problem of construction cost is high.
In order to realize above-mentioned technical characteristic, the object of the present invention is achieved like this：Carried out for CT scan technology big
The anchor rod anchored research method of volume swelling agent, it is characterised in that it comprises the following steps：
Step1：Choose rock material or rock-like materials；
Step2：Cutting material, multiple identical rock-like blocks or rocks test block are made, in each rock-like block or class
Rock test block center drills through cylinder bore, the rock-like block made or rocks test block is carried out into CT scan, and record rock
CT values, the rock CT values are the initial closely knit angle value before Rock experiment；
Step3：In the multigroup pressure sensor group of different depth disposed at equal distance away from aperture, in two mutual vertical side of rock-like block
10 pressure sensors are arranged in a manner of " central point of four angle point one " on face, are used in the two sides of arrangement pressure sensor high
Strength carbon fiber cloth wraps up, and surrounding fixes security against fire hoisting air cushion, and inflation applies pressure to simulate crustal stress under full-scale condition；
Step4：Identical non-metallic rock is fixed in each cylinder bore, foil gauge is arranged on non-metallic rock, and insert
Same depth；
Step5：Prepare the expansion cement slurry of multigroup different bulking agent levels, the group number and cylinder of different content expansion cement slurry
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, finally carries out pressurizing window using ordinary cement slurry in aperture,
Record is numbered to each group experiment simultaneously；
Step6：Multigroup pressure sensor is connected with pressure acquisition system immediately after grouting, after collection perfusion expansion cement slurry not
The CT scan before initial set is carried out with the pressure data of time, while to grouted rock once, i.e., rock and expansion slurry before initial set
CT values；Whole rock is soaked in water after initial set, it is middle to 28 days after initial set, each Monday is carried out to grouted rock
The CT values of secondary CT scan, synchronous recording pressure data and rock and expanding cement slurry, it is the stage rock and swelling water
The closely knit angle value of slurry body；
Step7：According to the pressure data gathered, the expansion cement slurry compression for drawing different bulking agent levels changes over time
Image；The CT values of the rock and expanding cement slurry of drawing different bulking agent levels according to the CT values of record simultaneously change over time
Image, both modified-images are established into corresponding relation, expanding machine of the research expanding cement slurry in true rock mass in time
Reason and changing rule；
Step8：Pull-out test step by step is carried out after expansion cement slurry final set, passes through CT scan, pressure acquisition system, strain acquirement
System, obtain data CT values, pressure data, strain data respectively, draw the expansion cement slurry of different bulking agent levels CT values,
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 changes over time rule, under real environmental conditions three main bodys and two interfacial failure patterns and Evolution, anchor axial force and
The regularity of distribution of shear stress, withdrawal resistance is finally given under real environmental conditions with the changing rule of bulking agent levels；
Three main body is：Anchor pole, anchoring body and rock mass or rocks body；
Two interface is：Two interfaces formed between anchor pole and anchoring body, between anchoring body and rock mass or rocks body.
In the Step1, poured into a mould from various rock mass as research object, rock-like materials for concrete.
Rock material is cut, 3 identical 300mm × 300mm × 300mm cube rocks are made in this experiment
Sample block, a cylinder bore, a diameter of 40mm of cylinder bore, depth 300mm are drilled through at each rock-like block center；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 records rock CT values, it is described
Rock CT values are the initial closely knit angle value before Rock experiment, using this obtain as experiment before situation inside rock exemplar.
In the multigroup pressure sensor group of 50mm, 150mm, 250mm depth disposed at equal distance away from top aperture, every group of pressure
Force snesor group is made up of three pressure sensors being arranged on same depth section, in the same plane, three on section
The individual mutual angle of pressure sensor is 120 °；With the side of " four angle points and an intermediate point " in two mutual vertical side of rock-like block
Formula arranges 10 pressure sensors；It is fixed in the two sides of arrangement pressure sensor using high-strength carbon fiber cloth parcel surrounding
Security against fire hoisting air cushion, inflated after carbon fiber rubber solidification and apply nMPa pressure to simulate crustal stress under full-scale condition.
Bolt diameter is used as 20mm, length be 600mm glass fibre anchor pole, insertion depth 300mm, in insertion
300mm depth ends are from the bottom groove milling on anchor pole vertically, slot length 250mm, wide 5mm, depth 2mm, between being waited in groove
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 irrigated into each hole
Ordinary cement slurry progress is rebasing, then irrigates the expansion cement slurry of different bulking agent levels of 250mm height respectively in hole simultaneously
And irrigate 25mm height ordinary cement slurries by its vibration compacting, in most backward each hole and sealed.
The data time of collection at intervals of：Continued to monitor in first 2 hours after perfusion expansion cement slurry, in latter 24 hours,
A pressure data was gathered every 2 hours；Irrigate in 24 hours to 48 hours after expansion cement slurry, one was gathered every 6 hours
Secondary pressure data；Gather a pressure data, record data every three days backward；The CT before initial set is carried out to grouted rock simultaneously
Run-down, i.e., the CT values of rock and expansion slurry before initial set；Whole rock is soaked in water after initial set, after initial set extremely
Among 28 days, grouted rock is carried out per CT scan once a week, synchronous recording pressure data and rock and expanding cement
The CT values of slurry, i.e., to the rock and the closely knit angle value of expanding cement slurry among 28 days after initial set.
According to the pressure data gathered, the expansion cement slurry compression for drawing different bulking agent levels changes over time figure
Picture；Simultaneously according to the rock of the different bulking agent levels of the CT values of the pressure data and rock of record and expanding cement slurry drafting and
The CT values of expanding cement slurry change over time image, and both modified-images are established into corresponding relation, 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, anchor pole is carried out step by step plus unloaded, when load reaches a certain
During grade, unloading processing is carried out, whole anchor system is placed on spiral CT machine together with security against fire hoisting air cushion and 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, be re-loaded to lower level again afterwards, then be scanned test, be so recycled to anchor pole and pull out
Go out, off-test, it is to obtain rock and swelling water in each grade loading procedure that CT scan is carried out after the unloading every time
Multiple compactness change before and after slurry body；
Data CT values, pressure data, strain data are obtained, draws CT values, the pressure of the expansion cement slurry of different bulking agent levels
Value, strain value change over time image, and analyze the anchoring system that can obtain the different bulking agent levels under real environmental conditions
Unite and change over time rule, formed between real environmental conditions lower bolt, anchoring body and the main body of soil mass three and three main bodys
The failure mode and Evolution at two interfaces, the regularity of distribution of anchor axial force and shear stress, finally give in real environmental conditions
With the changing rule of bulking agent levels, described true environment refers to simulate under the conditions of different crustal stress and immersion lower withdrawal resistance
Environment.
Wherein, the CT values that multiple CT scan obtains, including the initial CT values described in Step2 before Rock experiment are previously mentioned,
The CT values of rock and expansion slurry before expansion cement slurry initial set in Step6；To every CT once a week among 28 days after initial set
The rock obtained and expanding cement slurry CT values are scanned, rock and the expansion of CT scan acquisition are carried out after being unloaded every time in Step8
Cement slurry CT values, by all CT values drafting patterns, you can show rock mass before the expansion cement slurry of perfusion different content, fill
It is middle 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 the variation relation of expanding cement slurry during this can be obtained.
The method have the advantages that：
1st, the method that the anchor rod anchored research of large dosage swelling agent is carried out provided by the present invention for CT scan technology, uses glass fibers
Dimension anchor pole replace anchor metal, with high-strength carbon fiber cloth wrap up security against fire air cushion inflation replace hardware to rock around
Apply compression simulated ground stress, i.e., hardware is replaced with non-metallic member, solve the presence of metal in CT scan to anchor
Gu the CT values of internal system produce the problem of considerable influence, more can truly study 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
The failure mode and Evolution at the interface of main body two, the regularity of distribution of anchor axial force and shear stress, finally give withdrawal resistance with swollen
The changing rule of swollen agent content, reference and research application value are provided for slope retaining protection in Practical Project.
2nd, the device simulates the anchor rod anchored support conditions in true slope retaining protective environment completely, studies anchor pole resistance to plucking
Changing rule of the power under different environmental conditions with different bulking agent levels and three main bodys under real environmental conditions（Anchor pole,
Anchoring body, soil mass）Two interfaces（Interface between three main bodys）The distribution of failure mode and Evolution, anchor axial force and shear stress
Rule；
3rd, in the Patent equipment, anchor metal is replaced using glass fibre anchor pole, security against fire is wrapped up with high-strength carbon fiber cloth
Air cushion inflation replaces hardware to replace metal structure with non-metallic member to applying compression simulated ground stress around rock
Part, the presence for solving the problems, such as metal in CT scan produce considerable influence to the CT values inside anchor system；
4th, the patent exploitation CT scan technology, pressure acquisition system, strain acquisition system, three are used in combination jointly, from inside
Stress, internal modification, each interfacial failure damage carry out monitored over time, and outside carries out application confined pressure, simulated in true environment bar
The truth under suspension roof support under part so that obtained data are authentic and valid, more accurately, meet practical application.
5th, can study under the conditions of crustal stress and underground immersion, withdrawal resistance is with the changing rule of bulking agent levels, anchoring body
Interface normal stress, shear stress, the regularity of distribution of axle power；
6th, the device can be recycled, simple in construction, and material is easy to get, easy to operate, significantly save experimentation cost and cycle, Environmental Effect
It is beneficial notable.
Brief description of the drawings
The invention will be further described with reference to the accompanying 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 profiles of the present invention；
In figure, glass fibre anchor pole 1, expansion cement slurry anchoring body 2, rock-like block 3, security against fire hoisting air cushion 4, pressure sensing
Device 5, high-strength carbon fiber cloth 6, security against fire hoisting air cushion blowing mouth 7, foil gauge 8, pressure sensor group 9.
Embodiment
Embodiments of the present invention are described further below in conjunction with the accompanying drawings.
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
Step：
Step1：It is experiment material therefor from concrete test block；
Step2：3 identical cube class rock samples are made using concreting, its size is：300mm
×300mm×300mm；During test block is poured into a mould, a cylinder bore is reserved at each class rock sample center, cylinder bore
A diameter of 40mm, depth 300mm；After 28 days, CT scan is carried out once to class rock sample, obtains the CT inside class rock sample
Value（CT values are closely knit angle value）.
Step3：In the multigroup pressure sensor group of 50mm, 150mm, 250mm depth disposed at equal distance away from top aperture,
Every group of pressure sensor group is made up of three pressure sensors being arranged on same depth section, in the same plane, section
On three mutual angles of pressure sensor be 120 °；With " among four angle points and one in two mutual vertical side of rock-like block
The mode of point " arranges 10 pressure sensors；High-strength carbon fiber cloth parcel four is used in the two sides of arrangement pressure sensor
Week fixes security against fire hoisting air cushion, and inflation application 1MPa pressure should under full-scale condition to simulate after carbon fiber rubber solidification
Power；
Step4：Selection bolt diameter is 20mm, and length is 600mm glass fibre anchor pole, is inserted in class rock sample centre bore,
Depth is 300mm, insertion 300mm depth ends from the bottom groove milling on anchor pole vertically, slot length 250mm, wide 5mm,
Depth is 2mm, and foil gauge is equally spaced in groove.
Step5：Electronic scale weighs the cement that 3 deck labels are 42.5, and weight is respectively 183.6g, 162g, 140.4g, is claimed
The swelling agent for taking weight to be respectively 32.4g, 34g, 75.6g, weighs 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, are configured to the expansion cement slurry that bulking agent levels are 15%, 25%, 35%.Connect down
It is rebasing first to irrigate 25mm height ordinary cement slurries into each hole, then irrigates 250mm height respectively into each hole again
The expansion cement slurry of different bulking agent levels and by its vibration compacting, perfusion 25mm height ordinary cements in most backward each hole
Slurry is sealed；
Step6：Multigroup pressure sensor group is connected with pressure acquisition system, different time after collection perfusion expansion cement slurry
Pressure data, the data time of collection at intervals of：Continued to monitor in first 2 hours after perfusion expansion cement slurry, in latter 24 hours,
A pressure data was gathered every 2 hours；Irrigate in 24 hours to 48 hours after expansion cement slurry, one was gathered every 6 hours
Secondary pressure data；Gather a pressure data, record data every three days backward；The CT before initial set is carried out to grouted rock simultaneously
Run-down；Whole rock is soaked in water after initial set, it is middle to 28 days after initial set, each week is carried out to grouted rock
CT scan once, synchronous recording pressure data and CT values（CT values are the closely knit angle value of rock and expanding cement slurry).
Step7：According to the pressure data gathered, the expansion cement slurry compression of different bulking agent levels is drawn with the time
Modified-image；The CT values for drawing the expansion cement slurry of different bulking agent levels according to the CT values of record simultaneously change over time figure
Picture, both modified-images are established into corresponding relation, mechanism of intumescence of the research expanding cement slurry in true rock mass in time
And changing rule.
In Step8, hydraulic jack is utilized after expansion cement slurry final set, anchor pole is carried out step by step plus unloaded, work as load
When reaching a certain grade, unloading processing is carried out, whole anchor system is placed on spiral CT machine together with security against fire hoisting air cushion
Upper scanning（Also simulative immersion condition is scanned after immersion container can be put into）, it 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 afterwards, then is scanned test, so follows
Ring to anchor pole is extracted, off-test.Data CT values, pressure data, strain data are obtained, draws the expansion of different bulking agent levels
The CT values of cement mortar, pressure value, strain value change over time image, and analyze can obtain it is different swollen under real environmental conditions
The anchor system of swollen agent content changes over time rule, three main bodys under real environmental conditions（Anchor pole, anchoring body, soil mass）Two
Interface（Interface between three main bodys）The regularity of distribution of failure mode and Evolution, anchor axial force and shear stress, finally gives
Under real environmental conditions withdrawal resistance with bulking agent levels changing rule, the present invention in true environment refer to simulate different ground
Under the conditions of stress and immersion.
Embodiment two：
The method that the anchor rod anchored research of large dosage swelling agent is carried out for CT scan technology, this method comprise the following steps：
Step1：It is experiment material therefor from rigid sandstone；
Step2：Rock material is cut, makes 3 identical 300mm × 300mm × 300mm cube rock-like blocks,
Each rock-like block center turns to take 1 cylinder bore, a diameter of 40mm of cylinder bore, depth 300mm；The number of cylinder bore
Measure as 3；After the completion of drilling, CT scan is carried out to the rock-like block that will be made, and record CT values（CT values are that rock is closely knit
Angle value).
Step3：In the multigroup pressure sensor group of 50mm, 150mm, 250mm depth disposed at equal distance away from top aperture,
Every group of pressure sensor group is made up of three pressure sensors being arranged on same depth section, in the same plane, section
On three mutual angles of pressure sensor be 120 °；With " among four angle points and one in two mutual vertical side of rock-like block
The mode of point " arranges 10 pressure sensors；High-strength carbon fiber cloth parcel four is used in the two sides of arrangement pressure sensor
Week fixes security against fire hoisting air cushion, and inflation application 1.5MPa pressure should under full-scale condition to simulate after carbon fiber rubber solidification
Power；
Step4：Selection bolt diameter is 20mm, and length is 600mm glass fibre anchor pole, is inserted in class rock sample centre bore,
Depth is 300mm, insertion 300mm depth ends from the bottom groove milling on anchor pole vertically, slot length 250mm, wide 5mm,
Depth is 2mm, and foil gauge is equally spaced in groove.
Step5：Electronic scale weighs the cement that 3 deck labels are 42.5, and weight is respectively 183.6g, 162g, 140.4g, is claimed
The swelling agent for taking weight to be respectively 32.4g, 34g, 75.6g, weighs 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 slurries are first irrigated into each hole, then irrigate 250mm height respectively not into each hole again
With bulking agent levels expansion cement slurry and by its vibration compacting, perfusion 25mm height ordinary cement slurries in most backward each hole
Sealed；
Step6：Multigroup pressure sensor group is connected with pressure acquisition system, different time after collection perfusion expansion cement slurry
Pressure data, the data time of collection at intervals of：Continued to monitor in first 2 hours after perfusion expansion cement slurry, in latter 24 hours,
A pressure data was gathered every 2 hours；Irrigate in 24 hours to 48 hours after expansion cement slurry, one was gathered every 6 hours
Secondary pressure data；Gather a pressure data, record data every three days backward；The CT before initial set is carried out to grouted rock simultaneously
Run-down；Whole rock is soaked in water after initial set, it is middle to 28 days after initial set, each week is carried out to grouted rock
CT scan once, synchronous recording pressure data and CT values（CT values are the closely knit angle value of rock and expanding cement slurry).
Step7：According to the pressure data gathered, the expansion cement slurry compression of different bulking agent levels is drawn with the time
Modified-image；The CT values for drawing the expansion cement slurry of different bulking agent levels according to the CT values of record simultaneously change over time figure
Picture, both modified-images are established into corresponding relation, mechanism of intumescence of the research expanding cement slurry in true rock mass in time
And changing rule.
In Step8, hydraulic jack is utilized after expansion cement slurry final set, anchor pole is carried out step by step plus unloaded, work as load
When reaching a certain grade, unloading processing is carried out, whole anchor system is placed on spiral CT machine together with security against fire hoisting air cushion
Upper scanning（Also simulative immersion condition is scanned after immersion container can be put into）, it 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 afterwards, then is scanned test, so follows
Ring to anchor pole is extracted, off-test.Data CT values, pressure data, strain data are obtained, draws the expansion of different bulking agent levels
The CT values of cement mortar, pressure value, strain value change over time image, and analyze can obtain it is different swollen under real environmental conditions
The anchor system of swollen agent content changes over time rule, three main bodys under real environmental conditions（Anchor pole, anchoring body, soil mass）Two
Interface（Interface between three main bodys）The regularity of distribution of failure mode and Evolution, anchor axial force and shear stress, finally gives
Under real environmental conditions withdrawal resistance with bulking agent levels changing rule, the present invention in true environment refer to simulate different ground
Under the conditions of stress and immersion.
Above-described embodiment is used for illustrating the present invention, rather than limits the invention, the present invention spirit and
In scope of the claims, to any modifications and changes of the invention made, protection scope of the present invention is both fallen within.
Claims (9)
1. carry out the anchor rod anchored research method of large dosage swelling agent for CT scan technology, it is characterised in that it includes following step
Suddenly：
Step1：Choose rock material or rock-like materials；
Step2：Cutting material, make 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, by the rock-like block made or rocks test block（3）CT scan is carried out, and
Rock CT values are recorded, the rock CT values are the initial closely knit angle value before Rock experiment；
Step3：In the multigroup pressure sensor group of different depth disposed at equal distance away from aperture（9）, mutually hung down in rock-like block two
In straight sided 10 pressure sensors are arranged in a manner of " central point of four angle point one "（5）, in the both sides of arrangement pressure sensor
Face uses high-strength carbon fiber cloth（6）Parcel, surrounding fix security against fire hoisting air cushion（4）, it is true to simulate that inflation applies pressure
Crustal stress under reality condition；
Step4：Identical non-metallic rock is fixed in each cylinder bore（1）, non-metallic rock（1）Upper arrangement foil gauge（8）,
And insert same depth；
Step5：Prepare the expansion cement slurry of multigroup different bulking agent levels, the group number and cylinder of different content expansion cement slurry
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, finally carries out pressurizing window using ordinary cement slurry in aperture,
Record is numbered to each group experiment simultaneously；
Step6：Immediately by multigroup pressure sensor after grouting（5）It is connected with pressure acquisition system, collection perfusion expansion cement slurry
The pressure data of different time afterwards, while the CT scan before initial set is carried out once to grouted rock, i.e. rock and expansion before initial set
The CT values of slurry；Whole rock is soaked in water after initial set, it is middle to 28 days after initial set, each star is carried out to grouted rock
The CT values of the CT scan of phase once, synchronous recording pressure data and rock and expanding cement slurry are the stage rock and swollen
The closely knit angle value of swollen cement slurry；
Step7：According to the pressure data gathered, the expansion cement slurry compression for drawing different bulking agent levels changes over time
Image；The CT values of the rock and expanding cement slurry of drawing different bulking agent levels according to the CT values of record simultaneously change over time
Image, both modified-images are established into corresponding relation, expanding machine of the research expanding cement slurry in true rock mass in time
Reason and changing rule；
Step8：Pull-out test step by step is carried out after expansion cement slurry final set, passes through CT scan, pressure acquisition system, strain acquirement
System, obtain data CT values, pressure data, strain data respectively, draw the expansion cement slurry of different bulking agent levels CT values,
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 changes over time rule, under real environmental conditions three main bodys and two interfacial failure patterns and Evolution, anchor axial force and
The regularity of distribution of shear stress, withdrawal resistance is finally given under real environmental conditions with the changing rule of bulking agent levels；
Three main body is：Anchor pole, anchoring body and rock mass or rocks body；
Two interface is：Two interfaces formed between anchor pole and anchoring body, between anchoring body and rock mass or rocks body.
2. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is special
Sign is, in the Step1, is poured into a mould from various rock mass as research object, rock-like materials for concrete.
3. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is special
Sign is, in the Step2, cut rock material, in this experiment make 3 identical 300mm × 300mm ×
300mm cube rock-like blocks, drill through a cylinder bore at each rock-like block center, a diameter of 40mm of cylinder bore,
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
Record rock CT values, initial closely knit angle value of the rock CT values as before Rock experiment, using this obtain as experiment before rock
Situation inside exemplar.
4. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is special
Sign is, in the Step3, in the multigroup pressure sensing of 50mm, 150mm, 250mm depth disposed at equal distance away from top aperture
Device group（9）, every group of pressure sensor group（9）It is made up of three pressure sensors being arranged on same depth section, same
In plane, three mutual angles of pressure sensor on section are 120 °；With " corner in two mutual vertical side of rock-like block
The mode of point and an intermediate point " arranges 10 pressure sensors（5）；In arrangement pressure sensor（5）Two sides using high-strength
Spend carbon cloth（6）Wrap up surrounding, fixed security against fire hoisting air cushion（4）, the inflation application nMPa pressures after carbon fiber rubber solidification
Power is to simulate crustal stress under full-scale condition.
5. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is special
Sign is, in the Step4, uses bolt diameter as 20mm, and length is 600mm glass fibre anchor pole, and insertion depth is
300mm, insertion 300mm depth ends from the bottom groove milling on anchor pole vertically, slot length 250mm, wide 5mm, depth is
2mm, foil gauge is equally spaced in groove（8）.
6. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is 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 to irrigate the progress of 25mm height ordinary cement slurry, then irrigates the different bulking agent levels of 250mm height respectively in hole
Expansion cement slurry and irrigate 25mm height ordinary cement slurries by its vibration compacting, in most backward each hole and sealed.
7. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is special
Sign is, in the Step6, the data time of collection at intervals of：Continued to monitor in first 2 hours after perfusion expansion cement slurry,
Afterwards in 24 hours, a pressure data was gathered every 2 hours；Irrigate in 24 hours to 48 hours after expansion cement slurry, every 6
Pressure data of hour collection；Gather a pressure data, record data every three days backward；Grouted rock is carried out simultaneously
CT scan before initial set once, i.e., initial set before rock and expand slurry CT values；Whole rock is soaked in water after initial set,
It is middle 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 values of expanding cement slurry, i.e., to the rock and the closely knit angle value of expanding cement slurry among 28 days after initial set.
8. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is special
Sign is, in the Step7, according to the pressure data gathered, draws the expansion cement slurry compression of different bulking agent levels
Change over time image；Different swelling agents are drawn according to the CT values of the pressure data and rock of record and expanding cement slurry simultaneously
The rock of content and the CT values of expanding cement slurry change over time image, and both modified-images are established to corresponding pass in time
System, mechanism of intumescence and changing rule of the research expanding cement slurry in true rock mass.
9. the CT scan technology according to claim 1 that is used for carries out the anchor rod anchored research method of large dosage swelling agent, it is special
Sign is, in the Step8, hydraulic jack is utilized after expansion cement slurry final set, anchor pole is carried out step by step plus unloaded, works as lotus
When load reaches a certain grade, unloading processing is carried out, whole anchor system is placed on spiral CT together with security against fire hoisting air cushion
Scanned on machine, simulative immersion condition is scanned after being also 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 afterwards, then is scanned test, so
Anchor pole extraction is recycled to, off-test, it is to obtain in each grade loading procedure that CT scan is carried out after the unloading every time
Multiple compactness change before and after rock and expanding cement slurry；
Data CT values, pressure data, strain data are obtained, draws CT values, the pressure of the expansion cement slurry of different bulking agent levels
Value, strain value change over time image, and analyze the anchoring system that can obtain the different bulking agent levels under real environmental conditions
Unite and change over time rule, formed between real environmental conditions lower bolt, anchoring body and the main body of soil mass three and three main bodys
The failure mode and Evolution at two interfaces, the regularity of distribution of anchor axial force and shear stress, finally give in real environmental conditions
With the changing rule of bulking agent levels, described true environment refers to simulate under the conditions of different crustal stress and immersion lower withdrawal resistance
Environment.
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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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