CN105842075A - Calculation method of allowable pressure in concrete crack chemical stuck-inlet grouting - Google Patents
Calculation method of allowable pressure in concrete crack chemical stuck-inlet grouting Download PDFInfo
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- CN105842075A CN105842075A CN201610179725.0A CN201610179725A CN105842075A CN 105842075 A CN105842075 A CN 105842075A CN 201610179725 A CN201610179725 A CN 201610179725A CN 105842075 A CN105842075 A CN 105842075A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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Abstract
A calculation method of allowable pressure in concrete crack chemical stuck-inlet grouting includes the following steps: 1) establishing a simulating calculation model, setting reasonable boundary conditions, and determining distribution situation of grouting pressure in the cracks after the grouting pressure is applied; 2) establishing models in different stress distribution to calculate stress intensity factors at the tips in the concrete cracks; 3) testing fracture toughness of for-test concrete, and controlling the stress intensity at the tips in the concrete cracks to be not higher than the fracture toughness under effect of the grouting pressure, thereby back-calculating the maximum allowable grouting pressure of the concrete structure; 4) shaping concrete test samples which are provided with preformed cracks and are limited in size, verifying and determining the theoretically calculated concrete maximum allowable grouting pressure in a sealed hydraulic manner; and 5) researching and analyzing the diffusion radius of chemical slurry in the cracks under combined effects of the factors, and verifying and correcting the result with relative tests. The method is used for on-site grouting construction, is simple in calculation, is reasonable, is convenient to use and greatly satisfies engineering requirement.
Description
Technical field
The patch mouth forensic chemistry grouting of a kind of distress in concrete of the present invention allows the computational methods of pressure, belongs to experience in hydraulic concrete defect and repaiies
Recovering technology field.
Background technology
After distress in concrete is repaired by grouting, the building recovery original design stress state of structure reaches to use to be wanted with operating energy loss
Ask.Therefore, chemical grouting is a kind of based technique for in-situ remediation.In-situ immobilization not only quick, saving, and saving of work and time, and
There is good Social and economic benef@.Using chemical grouting repairing concrete crack is the most the most frequently used measure and method,
But the determination of the pressure of crack chemical grouting for a long time lacks necessary theoretical direction and scientific basis, it is mostly to amass with engineering experience
It is main for tiring out, and has carried out many inconvenience to engineering design generation, has also caused certain trouble to site operation.
The repairing in crack mainly takes chemical grouting mode to process, and the process of chemical grouting has boring method, patch mouth method, brill
Hole method+patch mouth methods etc., grouting material has the different cultivars such as epoxy, polyurethane, no matter which kind of process, material, to filling
It is both needed to for slurry specify that having one neither to destroy xoncrete structure can guarantee that again the permission force value stitching starch adhesive liquid filling full is asked
Topic.For a long time, this problem lacks system, complete theoretical basis and scientific basis always, and the most existing " water conservancy project is built
Build thing chemistry grouting construction specification " DL/T 5406-2010 and " concrete structure reinforcement design specification " GB 50367-2013,
The most the calculating to this value does not makees concrete regulation even with reference to regulation.
Summary of the invention
It is in the milk for Volume Concrete Cracks, uses fracture toughness and the newton friction principle scheduling theory of Fracture Mechanics of Concrete
Studying it, the present invention provides the patch mouth forensic chemistry grouting of a kind of distress in concrete to allow the computational methods of pressure, and for scene
Grouting construction, calculates simple, technically reliable, and convenient application meets requirement of engineering greatly.
The technical solution adopted in the present invention is:
The patch mouth forensic chemistry grouting of a kind of distress in concrete allows the computational methods of pressure, comprises the following steps:
Step 1: with Fem Computer emulation as technological means, by setting up Simulation Calculation, and sets rational limit
Boundary's condition, determines that this grouting pressure is in the distribution situation within crack after applying grouting pressure；
Step 2: based on Fracture Mechanics of Concrete theory, the model under the different stress distribution of foundation is asked and is calculated coagulation soil cracking
Stress intensity factor at seam is most advanced and sophisticated；Determination test Fracture Toughness of Concrete, for ensureing that concrete structure crack had been in the milk
Stability in journey, it should control under grouting pressure effect the stress intensity factor at distress in concrete tip and be not more than it and break
Split toughness, thus counter extrapolate the maximum grouting pressure that xoncrete structure allows；
Step 3: by molding respectively with the concrete sample of finite size in prefabricated crack, uses and closes setting-out checking really
Determine the maximum allowable grouting pressure of concrete of Theoretical Calculation, to determine its reasonability；
Step 4: based on hydrodynamics, researchs and analyses under the common effect of each factor, and chemical grout is inside crack
Dilation angle, and carry out correlation test checking revise.
The patch mouth forensic chemistry grouting of a kind of distress in concrete allows the computational methods of pressure, it is characterised in that at the concrete crack of water conservancy project
Learn the application in consolidation by grouting or impervious leakage-stopping process.
The patch mouth forensic chemistry grouting of a kind of distress in concrete of the present invention allows the computational methods of pressure, uses hydrodynamic analogy serosity
The decline of pressure situation when crack internal diffusion, draws the pressure in seam face and the relation of grouting mouth pressure at crack tip, with coagulation
Soil fracture toughness is basis for estimation, and the permission pressure of grouting mouth when accurately drawing patch mouth grouting, changing in the past can only be with
Experience carries out the setting of grouting pressure.
Accompanying drawing explanation
Fig. 1 is the scattergram (middle double outlet diffusions to both sides) of crack internal pressure value in the embodiment of the present invention.
Fig. 2 be in the embodiment of the present invention level to away from grout nipple position-pressure dependence figure (middle to both sides double outlet diffusion).
Fig. 3 is the scattergram (middle single outlet diffusion to both sides) of crack internal pressure value in the embodiment of the present invention.
Fig. 4 be in the embodiment of the present invention level to away from grout nipple position-pressure dependence figure (middle single outlet diffusion to both sides).
Fig. 5 is the scattergram (from one end to the other side diffusion) of crack internal pressure value in the embodiment of the present invention.
Fig. 6 is longitudinally away from grout nipple position-pressure dependence figure (from one end to the other side diffusion) in the embodiment of the present invention.
Fig. 7 is the scattergram (spreading from lower to upper from bottom) of crack internal pressure value in the embodiment of the present invention.
Fig. 8 be in the embodiment of the present invention longitudinally away from grout nipple position-pressure dependence figure (spreading from lower to upper from bottom).
Detailed description of the invention
The patch mouth forensic chemistry grouting of a kind of distress in concrete allows the computational methods of pressure, comprises the following steps:
Step 1: with Fem Computer emulation as technological means, by setting up Simulation Calculation, and sets rational limit
Boundary's condition, determines that this grouting pressure is in the distribution situation within crack after applying grouting pressure；
Step 2: based on Fracture Mechanics of Concrete theory, the model under the different stress distribution of foundation is asked and is calculated coagulation soil cracking
Stress intensity factor at seam is most advanced and sophisticated；Determination test Fracture Toughness of Concrete, for ensureing that concrete structure crack had been in the milk
Stability in journey, it should control under grouting pressure effect the stress intensity factor at distress in concrete tip and be not more than it and break
Split toughness, thus counter extrapolate the maximum grouting pressure that xoncrete structure allows；
Step 3: by molding respectively with the concrete sample of finite size in prefabricated crack, uses and closes setting-out checking really
Determine the maximum allowable grouting pressure of concrete of Theoretical Calculation, to determine its reasonability；
Step 4: based on hydrodynamics, researchs and analyses under the common effect of each factor, and chemical grout is inside crack
Dilation angle, and carry out correlation test checking revise.
Embodiment:
1, concrete grouting pressure computer simulation (patch mouth grouting):
Computational fluid dynamics (Computational Fluid Dynamics is called for short CFD) is hydromechanical one point
, it obtains certain fluid the most for information about by computer simulation, it is achieved replace test dress with computer
Put " calculating test ", provided the operating platform of actual condition analog simulation for engineers and technicians.Herein by adopting
With the most wide variety of fluent software at present, the stress distribution situation of filling process is carried out numerical simulation calculation.
A, middle double outlet diffusions to both sides:
Density p=the 1100kg/m3 of grouting liquid epoxy resin, viscosity is η=25mPa s.The setting of boundary condition: along splitting
Seam length direction two sides are symmetrical interface, and each crack boundary speed is 0.Fractured model basic condition is as follows: crack is long
Degree L=1m, crack discharge surface width d=0.8mm, penetration of fracture h=0.6m (i.e. its along the side of fracture length be high 0.6m,
The isosceles triangle of end 0.8mm).Grouting initial grouting pressure P=0.7MPa of mouth, direction be perpendicular to crack discharge surface vertically to
Under.Through iterative computation, after reaching convergence, the distribution situation of crack internal pressure value is as shown in Figure 1.Crack upper surface,
Along fracture length direction, the position relationship of its force value and grout nipple is as shown in Figure 2.
B, middle outlet to both sides but list are spread:
Density p=the 1100kg/m3 of epoxy resin, viscosity is η=25mPa s.The setting of boundary condition: along fracture length
Two sides, direction are symmetrical interface, and each crack boundary speed is 0.Crack basic condition is as follows: fracture length L=1m,
Crack upper surface width d=0.8mm, (i.e. it is high 0.6m along the side of fracture length to penetration of fracture h=0.6m, end 0.8mm
Isosceles triangle).Grouting initial grouting pressure P=0.5MPa of mouth, direction is perpendicular to crack upper surface mouth straight down.Warp
Crossing iterative computation, after reaching convergence, its force value is in the distribution situation within crack as shown in Figure 3.Crack upper surface, edge
The position relationship of fracture length direction, its force value and grout nipple is as shown in Figure 4.
C, from one end to the other side diffusion:
Grouting liquid pours into from the one end in crack, spreads along fracture length direction to the other end.The density of epoxy resin
ρ=1100kg/m3, viscosity is η=25mPa s.Setting of boundary condition: along two sides, fracture length direction as symmetry
Interface, each crack boundary speed is 0.Crack basic condition is as follows: fracture length L=1m, crack upper surface width d=0.8mm,
Penetration of fracture h=0.6m.I.e. it is high 0.6m along the side of fracture length, the isosceles triangle of end 0.8mm.At the beginning of grouting mouth
Beginning grouting pressure P=0.5MPa, direction is perpendicular to crack upper surface mouth straight down.Through iterative computation, after reaching convergence,
Its force value is in the distribution situation within crack as shown in Figure 5.Crack upper surface, along fracture length direction, its force value with
The position relationship of grout nipple is as shown in Figure 6.
D, spread from lower to upper from bottom:
For edge Vertical Cracks, grouting liquid pours into from Slit bottom crack mouth, diffuses up along crack vertical direction.Epoxy
Density p=the 1100kg/m3 of resin, viscosity is η=25mPa s.The setting of boundary condition: along vertical extension direction, crack
Two bottom surfaces are symmetrical interface, and each crack boundary speed is 0.Crack basic condition is as follows: fracture height h=0.6m, splits
Sealing face width d=0.8mm, (i.e. it is high 0.6m along the upper bottom surface of crack vertical extension to penetration of fracture h=0.6m, the end
The isosceles triangle of 0.8mm).Grouting initial grouting pressure P=0.5MPa of mouth, direction is perpendicular to crack discharge surface level to the right.
Through iterative computation, after reaching convergence, its force value is in the distribution situation within crack as shown in Figure 7.Crack upper surface,
Along fracture length direction, the position relationship of its force value and grout nipple is as shown in Figure 8.
Use hydromechanical ultimate principle, with fluent software, the stress distribution situation of filling process is carried out Numerical-Mode
Intend calculating, it is believed that: when grouting process is patch mouth grouting, for horizontal joint, grout nipple is arranged on middle to both sides diffusion grouting
Time, grout nipple spacing is preferably 25cm, and the pressure at crack tip is about the half of the mouth initial pressure that is in the milk；And from one end to separately
During the grouting of one end, the pressure at crack tip is 0.7 times of initial pressure；For vertical fracture, grouting has bottom up to enter
Row grouting, the spacing of patch mouth preferably selects 30cm, and the pressure of crack tip is 0.7 times of initial pressure.
2, the determination of grout nipple (patch mouth method) place's permission pressure:
According to the fracture theory of concrete crack expansion, generation professor is by the virtual crack concept of reflection concrete softening characteristic slowly
Combine with stress intensity factor parameter, it is proposed that double-K fracture criterion, in Concrete Crack Propagation Process, work as application
In the distress in concrete dehiscence process that stress intensity factor is stated, the concept of two key control parameters, i.e. corresponding to initial
The initiation angle of crack initiation stateIt is corresponding for the initial cracking load value in concrete sample fracture toughness test loading procedure
FQ；Generally in the range of (0.6～0.9 times) of loading maximum and corresponding to the toughness of instability statusIts institute
Corresponding for the maxium load value F in concrete sample fracture toughness test loading proceduremax。
With the fracture toughness under concrete peak loadThe basis for estimation destroyed as concrete cracking.With opening mode (I type)
Crack is object of study, for concrete I type crack chemical grouting extension judgment criterion is:
KI≤KIC (1)
In formula: KI-I type stress intensity factor, by Specimen Shape, size, External Force Acting mode and fractue spacing form etc.
Impact；
KICThe Roughness Parameter of-concrete opposing macroscopic cracking unstable propagation,
The computing formula the most then obtaining stitching at crack tip surface pressure is:
In formula: σ is seam surface pressure at crack tip；For toughness；F1 is body coefficient；A is half length in crack.
Fracture Toughness of Concrete value, generally 0.3～1.4MPa.m-1/2, value 1.0MPa.m-1/2 during research；For
The crack of mass concrete, body coefficient F1 value is 1.
After obtaining crack tip seam surface pressure σ, grout nipple allows pressure P, is respectively as follows: facade Vertical Cracks or R-joining
At Jian Duan, the pressure in seam face is 0.7 times of grout nipple pressure, i.e. 0.7P=σ；At plane suture tip, the pressure in seam face is grouting
0.5 times of mouth pressure, i.e. 0.5P=σ.
Claims (2)
1. the computational methods of a distress in concrete patch mouth forensic chemistry grouting permission pressure, it is characterised in that comprise the following steps:
Step 1: by setting up Simulation Calculation, and set rational boundary condition, determines after applying grouting pressure,
This grouting pressure is in the distribution situation within crack；
Step 2: the stress intensity factor calculated at distress in concrete tip sought by the model set up under different stress distribution；Measure
Test Fracture Toughness of Concrete, controls under grouting pressure effect, and the stress intensity factor at distress in concrete tip is little
In its fracture toughness, thus the anti-maximum grouting pressure extrapolating xoncrete structure permission；
Step 3: by molding respectively with the concrete sample of finite size in prefabricated crack, uses and closes setting-out, checking
Determine the maximum allowable grouting pressure of concrete of Theoretical Calculation；
Step 4: researching and analysing under the common effect of each factor, chemical grout is at the dilation angle within crack, and carries out
Verification experimental verification correction.
2. the computational methods of a distress in concrete patch mouth forensic chemistry grouting permission pressure, it is characterised in that split at concrete for hydraulic structure
Application in seam chemical grouting reinforcing or impervious leakage-stopping process.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111735937A (en) * | 2020-07-27 | 2020-10-02 | 广东博智林机器人有限公司 | Method and device for detecting whether grouting is full in grouting equipment |
| CN115198791A (en) * | 2022-05-20 | 2022-10-18 | 中交隧道工程局有限公司 | Bottom grouting process for mounting lower structural member of large-diameter shield tunnel |
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| CN104652373A (en) * | 2015-02-05 | 2015-05-27 | 河海大学 | Method for calculating stability safety factor of concrete gravity dam under multi-dam-section combined skid resistance condition |
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| CN104652373A (en) * | 2015-02-05 | 2015-05-27 | 河海大学 | Method for calculating stability safety factor of concrete gravity dam under multi-dam-section combined skid resistance condition |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735937A (en) * | 2020-07-27 | 2020-10-02 | 广东博智林机器人有限公司 | Method and device for detecting whether grouting is full in grouting equipment |
| CN115198791A (en) * | 2022-05-20 | 2022-10-18 | 中交隧道工程局有限公司 | Bottom grouting process for mounting lower structural member of large-diameter shield tunnel |
| CN115198791B (en) * | 2022-05-20 | 2024-02-02 | 中交隧道工程局有限公司 | Bottom grouting process for installing lower structural part of large-diameter shield tunnel |
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