CN108412498A - Freeze sinking construction pit shaft annular causes calamity channel grouting treatment design method - Google Patents
Freeze sinking construction pit shaft annular causes calamity channel grouting treatment design method Download PDFInfo
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- CN108412498A CN108412498A CN201810182207.3A CN201810182207A CN108412498A CN 108412498 A CN108412498 A CN 108412498A CN 201810182207 A CN201810182207 A CN 201810182207A CN 108412498 A CN108412498 A CN 108412498A
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- slip casting
- grouting
- slurries
- grouting pressure
- pit shaft
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/10—Preparation of the ground
- E21D1/12—Preparation of the ground by freezing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
Abstract
The invention discloses a kind of freeze sinking construction pit shaft annulars to cause calamity channel grouting treatment design method, it is analyzed including pit shaft freezing sinking technique data and Surrounding Rock Engineering Geological Conditions, typical injecting paste material physicochemical property test, freezing hole circular passage grout diffusion model and diffusion governing equation structure, grouting pressure theoretical value based on slip casting process control calculates, limit grouting pressure based on slip casting security control calculates, slip casting section is chosen and final grouting pressure is determined with spacing of wells design value, slip casting course control method for use is formulated, slip casting ending standard is formulated, grouting treatment conceptual design and etc..After the design method, the science selection that the slip casting of pit shaft freezing hole blocks critical technical parameter is realized, good slip casting effect is achieved.
Description
Technical field
The invention belongs to mine water disaster prevention and control field, the freezing hole annular of especially freeze sinking construction pit shaft causes calamity logical
The design method that road slip casting blocks.
Background technology
China mine of western stratum has the feature that alluvium is shallow, weak cementing bedrock thickness is big, rich water rock stratum is developed, to protect
Hinder shaft construction safety, full depth freeze-wellboring technology is used widely in the pit shaft construction of rich water rock stratum.Freeze-wellboring
The principle of technology is that the freezing hole that is drilled with around pit shaft will be utilized to recycle low temperature mediator in hole, absorb country rock heat and
It is formed in the earth formation using freezing hole as node and freezes water-stop curtain.The stratum Cheng Jinghou gradually thaw, and water-stop curtain failure is freezed
The annular space between freezing pipe and hole wall in hole will form hidden conduit pipe, and long-term water-rock effect or freezing hole are by well
After lane engineering discloses, infiltration and discharge disaster, become the important cause calamity channel of pit shaft water damage, seriously affect mine and build frequent occurrence
And if production safety.Circular passage between freezing hole and freezing pipe is subjected to closure filling by grouting method, can effectively be prevented
Water damage caused by controlling freezing hole.However, Grouting engineering, which lies concealed property, causes circular passage grouting treatment solution formulation and design often
Dependence experience, especially grouting pressure and the selection of slip casting pitch of holes cause design value deviation larger due to lacking scientific guidance.
If grouting pressure is excessive, high-pressure slip-casting applies excessive load to the borehole wall and country rock, is unfavorable for pit shaft stabilization and causes the borehole wall broken
It is bad；If grouting pressure is too small or discloses that the slip casting pitch of holes of same annular conduit pipe is excessive, and annular conduit pipe cannot be complete
Entirely by envelope envelope there are close bad section, slip casting effect is poor, inflow of water will be caused to increase because slip casting blocks weak area
Greatly, severe patient causes borehole wall damage initiation to flood well accident.
Invention content
The purpose of the present invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of freeze sinking construction pit shaft annular
Cause calamity channel grouting treatment design method.
To achieve the above object, the present invention uses following technical proposals：
Freeze sinking construction pit shaft annular causes calamity channel grouting treatment design method, includes the following steps：
A. pit shaft freezing sinking technique data and Surrounding Rock Engineering Geological Conditions analysis：Pit shaft freezing construction information is analyzed, entirely
Grasp freezing hole information in face；Pit shaft location rock layer mechanics parameter is tested, is laid the foundation for theoretical research.
B. typical injecting paste material physicochemical property test：Different ratio slurry viscosity is obtained by laboratory test to change over time
Rule and slurries gel time.
C. freezing hole circular passage grout diffusion model and diffusion governing equation structure：It is logical that generalization boundary condition establishes annular
Road grout diffusion model further analyzes slurries and spreads mechanical process, derives slurries and spread governing equation.
D. the grouting pressure theoretical value based on slip casting process control calculates：Governing equation, which is spread, according to slip casting calculates slip casting pressure
Power theoretical maximum.
E. the limit grouting pressure based on slip casting security control calculates：It analyzes the lower borehole wall of slip casting effect and surrouding rock deformation and breaks
Bad feature determines that the slip casting of freezing hole circular passage blocks limit grouting pressure value.
F. slip casting section is chosen and final grouting pressure is determined with spacing of wells design value：It is unclosed to analyze freezing hole circular passage
Section formation lithology and underground water hydrostatic pressing force value determine Grouting engineering Work sectors and final grouting pressure and slip casting pitch of holes.
G. slip casting course control method for use is formulated：It is carried with when slip casting rate during slip casting by adjusting injecting paste material in real time
Go out controlling grouting method, grouting pressure is made to be within zone of reasonableness, control grout mixing and guarantee adjoining rock stability.
H. slip casting ending standard is formulated：It is proposed that single slip casting terminates item based on slip casting rate, grouting pressure and slip casting time
Part.
I. freezing hole annular causes calamity channel grouting treatment conceptual design：From injecting paste material selection, grouting pressure control, slip casting
Grouting program is formulated in ending standard determination, injected hole arrangement, slip casting process control etc..
Pit shaft freezing sinking technique data and Surrounding Rock Engineering Geological Conditions analysis specifically include in the step A：
Comprehensively collect pit shaft freezing method construction information, grasp freeze hole number, arrangement, the depth of freezing, freezing hole and
Freeze pipe size, freezing hole encapsulation situations and the unclosed area's formation lithology structure feature of freezing hole.It is obtained according to pilot hole of shaft
The core that takes makes rock sample, tests the basic mechanical parameter of Different Strata, including uniaxial compressive strength, uniaxial tension are strong
Degree, cohesive force and internal friction angle, parameter is provided for the research of slip casting diffusion theory and Three-Dimensional Numerical Analysis model foundation.
Typical injecting paste material physicochemical property test specifically includes in the step B：
Common cement single slurry and cement-sodium silicate double liquid are prevented as object using mine water disaster, carry out indoor slurries
Gel test measures the presetting period for not having to proportioning slurries.The cement single slurry refers to being stirred by dry cement and water
Made of slurries, proportioning is indicated with ratio of mud w/s, refers to the mass ratio of dry cement and water in slurries.The cement-water glass
Glass dual slurry refers to the slurries mixed by cement single slurry and waterglass, proportioning C:S is indicated, refers to cement in slurries
The volume ratio of single slurry and waterglass slurry.From the presetting period refers to the River Bank Stability moment, by liquid due to viscosity increases
It is converted into the solid corresponding time.The viscosity that acquisition cement-water-clay system is tested by viscosity test changes with time
Curve obtains viscosity time-varying function after data are fitted；
It can be represented by the formula through data fitting rear slurry viscosity time-varying function：
μ (t)=ktn+μ0
In formula, μ (t)-slurry viscosity time-varying functions, t-slip casting time, μ0- slurries initial viscosity, k are viscous with n-slurries
Spend time-varying parameter.
Freezing hole circular passage grout diffusion model and diffusion governing equation structure specifically include in the step C：
General knot hole annular channel boundary condition of thawing, establishes slip casting diffusion physical model；It is derived based on Interval static analysis
Slurries moving equilibrium equation；In conjunction with slurry viscosity time-varying function and the principle of mass conservation, propose that slurries spread mechanics analysis model,
It further builds slurries in circular passage and spreads governing equation, be shown below：
In formula, pg- grouting pressure theoretical value, q '-slip casting rates, the corresponding slurries diffusion length of Z-grouting pressure,
rm- slurries spread plane of symmetry position, R-circular passage lateral wall radius, r-madial wall radius, r0- slip casting pore radius, pw—
The hydrostatic pressure of underground water, μ0- slurries initial viscosity, k and n-slurry viscosity time-varying parameter, Rr indicate the product of R and r.
The grouting pressure theoretical value calculating based on slip casting process control specifically includes in the step D：
It analyzes circular passage slip casting and spreads governing equation, determine the principal element for influencing slurries diffusion process, obtain viscosity
Grouting pressure component part during time-varying slurries slip casting, the viscosity time dependent grout refers to cement-sodium silicate double liquid,
The grouting pressure is made of diffusion region slurries viscous force, slurries and circular passage sidewall friction power and hydrostatic pressure.It is theoretical
In analysis, circular passage side wall is assumed to be shiny surface, therefore slurries are negligible with channel side wall frictional force.It is logical according to research area's annular
Road size and initial slip casting rate calculate under the conditions of Practical Project maximum viscous force in cement-sodium silicate double liquid diffusion process,
After when slip casting area, hydrostatic pressure measures, grouting pressure theoretical value can acquire.The circular passage size refers to circular passage
Cross section exradius and inner circle radius.The slip casting rate refers to the slip casting being injected into the unit interval in circular passage
Amount.The maximum viscous force refers to the sum of cement-sodium silicate double liquid presetting period corresponding diffusion region slurries viscous force.Institute
The grouting pressure theoretical value stated is equal to the sum of diffusion region slurries maximum viscous force and slip casting area hydrostatic pressure.
The limit grouting pressure based on slip casting security control calculates specific as follows in the step E：
It is logical to establish freezing hole annular in conjunction with pit shaft formation lithology structure for the rock basic mechanical parameter measured according to step A
Road slip casting blocks Three-Dimensional Numerical Analysis model, the borehole wall and surrouding rock deformation and failure law under different grouting pressures is analyzed, by slip casting
The grouting pressure that borehole wall generation obviously deforms in the process is determined as limit grouting pressure, and grouting pressure cannot surpass in Grouting engineering
Cross the grouting pressure.
The selection of slip casting section and final grouting pressure determine specific as follows with the spacing of wells in the step F：
Unclosed section of hole of pit shaft freezing large scale hydrogeological profile is drawn, selection thickness is stable, water isolating is good
Stratum as mortar depositing construction region.Mortar depositing construction local ground watering hydrostatic pressure is determined according to mine hydrogeology peephole,
Determine therefrom that grouting pressure theoretical value.Consider grouting pressure theoretical value and limit grouting pressure, determines in Grouting engineering
Final grouting pressure.
The final grouting pressure determines that principle is：If final grouting pressure theoretical value is less than limit grouting pressure, slip casting is chosen
Final pressure theoretical value is final grouting pressure design value；Otherwise using limit grouting pressure as final grouting pressure design value.It is spread and is controlled according to slurries
Equation processed calculates slurries diffusion length corresponding with final grouting pressure design value, and in this, as the same circular passage of closure
Adjacent slip casting pitch of holes.
The formulation of slip casting course control method for use specifically includes in the step G：
Governing equation is spread according to slip casting, grout coordinate ratio and slip casting rate are can be taking human as two of control in Grouting engineering
Factor proposes that material mixture ratio dynamic regulation and slip casting velocity gradient control technology are used for slip casting process control with this.
The material mixture ratio dynamic adjustment technique refers to the volume ratio of interval change cement mortar and waterglass, improves slurry
Liquid curing reaction rate makes to inject dual slurry PhastGel in channel in advance, reduce the flowable cross-sectional area of slurries, it can be achieved that
Water passage quick blocking, and control slurries diffusion length；Or the intermittent adjustment cement single slurry ratio of mud, it is viscous to change slurries
Spend the feature that changes with time.
The slip casting velocity gradient control technology refers to that slip casting selects larger initial slip casting rate early period, when slip casting pressure
After power is stablized, slip casting rate is continuously decreased, fully blocking and improving between gelinite and circular passage palisades conducive to circular passage
Cementitiousness
The formulation of slip casting ending standard specifically includes in the step H：
After injection cement single slurry reaches final pressure, slip casting rate is reduced to 50~60L/min and stablizes 30min, can terminate
Slip casting；If slurries are cement-sodium silicate double liquid, grouting pressure reaches final pressure, and total slip casting rate of two kinds of slurries is down to
100L~200L/min and stable 30min, can terminate slip casting.
Grouting program, which designs, in the step I includes：
From the selection of injecting paste material proportioning, grouting pressure control, slip casting ending standard is determining, injected hole is arranged, slip casting process
Grouting program is formulated in control etc., carries out grouting treatment engineering in slip casting region according to the program, and according to slip casting process
Adjustment grouting design scheme in time.
The beneficial effects of the invention are as follows：
1, freeze sinking construction pit shaft annular conduit pipe can often cause mine water disaster, most common Treatment Methods to be
Grouting behind shaft or drift lining.The slip casting Process Design stage is it needs to be determined that grouting pressure, disclose the adjacent slip casting of same freezing hole circular passage
Pitch of holes, slip casting ending standard and slip casting course control method for use, in previous grouting design, these key contents be according to
Obtained by experience and Grouting engineering implements the field experience of personnel and experience accumulation has substantial connection, but lacks rational section
Learn guidance.The present invention starts with from the common slurries rheological characteristic of grouting treatment engineering, establishes to meet by theoretical research and administers Qu works
The slurries diffusion theory equation of condition condition, obtains the quantitative relationship between grouting pressure, slip casting rate and slurries diffusion length,
Scientific basis is established for the selection of final grouting pressure, slip casting ending standard and slip casting pitch of holes.
2, after pit shaft is built up, grouting behind shaft or drift lining development needs to be drilled with injected hole across the borehole wall, until extending to freezing hole annular
Channel.During Grouting engineering is implemented, grouting pressure is applied to load form on injected hole side wall.If grouting pressure is excessive,
High-pressure slip-casting applies excessive load to the borehole wall and country rock, is unfavorable for pit shaft stabilization and leads to shaft lining breakage, therefore controls slip casting pressure
Power plays an important roll surrounding rock stability within the scope of rational.Combining with theoretical analysis and borehole wall stability in the present invention
The analysis integrated rational grouting pressure design value of determination, and propose to ensure the safely controllable slip casting process control side of grouting pressure
Method plays an important roll country rock safety and stability during ensuring slip casting.
3, the present invention is based on theory analysis, it is proposed that a set of construction freezing method pit shaft circular passage grouting treatment design side
Method, in conjunction with field working conditions condition, you can obtain slip casting critical technical parameter, can preferably be answered after being combined with previous engineering experience
For engineering practice.
Description of the drawings
Fig. 1 is freezing hole circular passage grouting treatment design method floor map；
Fig. 2 is freezing hole circular passage encapsulation situations schematic diagram；
Fig. 3 is freezing hole circular passage slip casting diffusion physical model.
Wherein, 2-1：Pit shaft；2-2：Freezing hole；2-3：Freezing hole enclosed area；2-4：The unclosed area of freezing hole；2-5：1#
Water-bearing layer；2-6：Water barrier；2-7：The water-bearing layers 2#；2-8：Coal seam；2-9：The borehole wall；3-1：Freezing hole circular passage lateral wall；3-
2：Freezing hole circular passage madial wall；3-3：Injected hole；3-4：Underground water in stratum；3-5：Inject slurries；3-6：Slurries expand
Dissipate distance.
Specific implementation mode
Present invention will be further explained below with reference to the attached drawings and examples.
Structure, ratio, size etc. depicted in this specification institute accompanying drawings, only to coordinate specification it is revealed in
Hold, so that those skilled in the art understands and reads, is not limited to the enforceable qualifications of the present invention, therefore does not have skill
Essential meaning in art, the modification of any structure, the change of proportionate relationship or the adjustment of size can be produced not influencing the present invention
Under raw effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents obtain and can cover.
Meanwhile cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, be merely convenient to
Narration is illustrated, rather than to limit the scope of the invention, relativeness is altered or modified, without substantive change
Under technology contents, when being also considered as the enforceable scope of the present invention.
M mine main shafts are using complete deep freeze sinking construction, depth of freezing 865.00m, wherein thickness of surface soil
43.58m, rock section thickness 805.92m.Freezing borehole 44, diameter of phi 192mm, freezing pipe using 140 × 6mm of caliber Φ without
Stitch steel pipe.Freezing hole is enclosed using mud replacement technique from the above 200m ranges of bottom hole, other sections of circular passage are to block,
The water-bearing layers the 1# water-bearing layers Zu Ji2# on working seam top are directly linked up.When pit mining, the water-bearing layers 2# underground water will be fed
The water-bearing layers 1#, and coal mine excavation region is eventually entered into, the water yield during pit mining is greatly increased, increases mine drainage and takes
With.Therefore it needs to carry out slip casting closure to circular passage.Its grouting treatment scheme is formulated according to the following steps.
A. pit shaft freezing sinking technique data and Surrounding Rock Engineering Geological Conditions analysis
M mine main shaft 2-1 construction freezing method data is collected comprehensively, and the freezing hole 2-2 relevant informations of grasp are frozen for main shaft
Junction depth 865.0m, and the overwhelming majority is in Bedrock Region；Freezing hole is 44 total, and freezing hole circular passage size is：Outer diameter Φ
192mm, internal diameter Φ 140mm；The above 200m ranges 2-3 closings in freezing hole circular passage bottom, other sections 2-4 is unclosed, at
For conduit pipe.The unclosed area's basement rock of freezing hole mainly include three parts stratum, be followed successively by from bottom to top the water-bearing layers 1# 2-5, every
After water layer 2-6 and 2# water-bearing layer 2-7, coal seam 2-8 exploitations, mine roof water yield increases.It is obtained according to pilot hole of shaft
Core makes rock sample, tests the basic mechanical parameter of Different Strata, including uniaxial compressive strength, uniaxial tensile strength, interior
Poly- power and internal friction angle provide parameter for the research of slip casting diffusion theory and Three-Dimensional Numerical Analysis model foundation.
B. typical injecting paste material physicochemical property test
Common cement single slurry and cement-sodium silicate double liquid are prevented as object using mine water disaster, carry out indoor slurries
Gel test measures the presetting period for not having to proportioning slurries.The cement single slurry refers to being stirred by dry cement and water
Made of slurries, proportioning is indicated with ratio of mud w/s, refers to the mass ratio of dry cement and water in slurries.The cement-water glass
Glass dual slurry refers to the slurries mixed by cement single slurry and waterglass, proportioning C:S is indicated, refers to cement in slurries
The volume ratio of single slurry and waterglass slurry.From the presetting period refers to the River Bank Stability moment, by liquid due to viscosity increases
It is converted into the solid corresponding time.Injecting paste material selects P.O32.5 portland cements, waterglass Baume degrees 38, modulus 3.0.
The physicochemical property of the cement-sodium silicate of two kinds of proportionings is measured by experiment：
(1) w/s=1, and C:S=1:1 cement-sodium silicate double liquid, presetting period 85s；
(2) w/s=1, and C:S=2:1 cement-sodium silicate double liquid, presetting period 50s；
The viscosity versus time curve that both the above slurries are obtained by viscosity test experiment, after data are fitted
Slurry viscosity time-varying function can be represented by the formula：
μ (t)=ktn+μ0
In formula, μ (t)-slurry viscosity time-varying functions, t-slip casting time, μ0- slurries initial viscosity, k are viscous with n-slurries
Spend time-varying parameter.
C. freezing hole circular passage grout diffusion model and diffusion governing equation structure
General knot hole annular channel boundary condition of thawing proposes basic theories it is assumed that establishing slip casting diffusion physical model, physics
Model annular passage lateral wall 3-1 radiuses are R, and madial wall 3-2 radiuses are r, and injected hole 3-3 radiuses are r0, underground water 3-4's
Hydrostatic pressure is pw, and the grouting pressure that injection slurries 3-5 is generated is pg, and slurries diffusion length is Z 3-6, and slip casting rate is q=
2q’；Slurries moving equilibrium equation is proposed according to Interval static analysis, in conjunction with slurry viscosity time-varying function and the principle of mass conservation,
Slurries diffusion mechanics analysis model is established, further derives that slurries spread governing equation in circular passage, are shown below
In formula, pg- grouting pressure theoretical value, q '-slip casting rates, the corresponding slurries diffusion length of Z-grouting pressure,
rm- slurries spread plane of symmetry position, R-circular passage lateral wall radius, r-madial wall radius, r0- slip casting pore radius, pw—
The hydrostatic pressure of underground water, μ0- slurries initial viscosity, k and n-slurry viscosity time-varying parameter, Rr indicate the product of R and r.
D. the grouting pressure theoretical value based on slip casting process control calculates
It analyzes circular passage slip casting and spreads governing equation, determine that the principal element for influencing slurries diffusion process has grouting parameter
(i.e. slip casting rate q '), injecting paste material proportioning (i.e. viscous time-varying parameter n and k), circular passage size (i.e. R and r) and underground water
Hydrostatic pressure (i.e. pw), and the generation of grouting pressure is the result that ever-increasing slurries viscous force is superimposed with groundwater pressure.
According to Practical Project, parameter in A is brought into slurries diffusion governing equation, when can calculate cement-sodium silicate double liquid initial set
Diffusion region slurries maximum viscous force, after when slip casting area, hydrostatic pressure measures, grouting pressure theoretical value can acquire.
E. the limit grouting pressure based on slip casting security control calculates
It is logical to establish freezing hole annular in conjunction with pit shaft formation lithology structure for the rock basic mechanical parameter measured according to step A
Road slip casting blocks Three-Dimensional Numerical Analysis model, analyzes borehole wall 2-9 and surrouding rock deformation and failure law under different grouting pressures, will note
The grouting pressure that borehole wall generation obviously deforms during slurry is determined as limit grouting pressure, and grouting pressure cannot in Grouting engineering
More than the grouting pressure.
F. slip casting section is chosen and final grouting pressure is determined with the spacing of wells
Unclosed section of hole of pit shaft freezing large scale hydrogeological profile is drawn, selection thickness is stable, water isolating is good
Stable group of stratum 2-5 as mortar depositing construction region.Mortar depositing construction local ground watering is determined according to mine hydrogeology peephole
Hydrostatic pressure determines therefrom that grouting pressure theoretical value.Final grouting pressure determines that principle is：If maximum theoretical is less than limit slip casting pressure
Power, then it is final grouting pressure design value to choose grouting pressure theoretical maximum；Otherwise it is designed by final grouting pressure of limit grouting pressure
Value.Governing equation is spread according to slurries, calculates slurries diffusion length corresponding with final grouting pressure design value, and in this, as envelope
Block up the adjacent slip casting pitch of holes of same circular passage.
G. slip casting course control method for use is formulated
Governing equation is spread according to slip casting, grout coordinate ratio and slip casting rate are can be with two of artificial adjustment in Grouting engineering
Key factor proposes that material mixture ratio dynamic regulation and slip casting velocity gradient control technology are used for slip casting process control with this.Material
Proportioning dynamic adjustment technique refers to the volume ratio of interval change cement mortar and waterglass, improves grout curing reaction rate, makes
Dual slurry PhastGel in channel is injected in advance, reduces the flowable cross-sectional area of slurries, it can be achieved that water passage quick blocking,
And control slurries diffusion length.Slip casting velocity gradient control technology refers to that slip casting selects larger initial slip casting rate early period, when
After grouting pressure is stablized, gradient reduces slip casting rate, fully blocking and improve gelinite and circular passage conducive to circular passage
Cementitiousness between palisades
H. slip casting ending standard is formulated
After injection cement single slurry reaches final pressure, slip casting rate is reduced to 50~60L/min and stablizes 30min, can terminate
Slip casting；If slurries are C-S dual slurries, grouting pressure reaches final pressure, and total slip casting rate of two kinds of slurries is down to 100L~200L/
Min and stable 30min, can terminate slip casting.
I. grouting program designs
From the selection of injecting paste material proportioning, grouting pressure control, slip casting ending standard is determining, injected hole is arranged, slip casting process
Grouting program is formulated in control etc., carries out grouting treatment engineering in slip casting region according to the program, and according to slip casting process
Adjustment grouting design scheme in time.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of freeze sinking construction pit shaft annular causes calamity channel grouting treatment design method, characterized in that including following step
Suddenly：
A. pit shaft freezing sinking technique data and Surrounding Rock Engineering Geological Conditions analysis：Analyze pit shaft freezing construction information, Quan Mianzhang
Hold freezing hole information；Pit shaft location rock layer mechanics parameter is tested, is laid the foundation for theoretical research；
B. typical injecting paste material physicochemical property test：Different ratio slurry viscosity, which is obtained, by laboratory test changes over time rule
And slurries gel time, it is indicated with following formula through data fitting rear slurry viscosity time-varying function：
μ (t)=ktn+μ0
In formula, μ (t)-slurry viscosity time-varying functions, t-slip casting time, μ0- slurries initial viscosity, when k is with n-slurry viscosity
Variable element；
C. freezing hole circular passage grout diffusion model and diffusion governing equation structure：
General knot hole annular channel boundary condition of thawing, establishes slip casting diffusion physical model；Slurries are derived based on Interval static analysis
Moving equilibrium equation；In conjunction with slurry viscosity time-varying function and the principle of mass conservation, propose that slurries spread mechanics analysis model, into one
Slurries spread governing equation in step structure circular passage, derive slurries and spread governing equation, are shown below：
In formula, pg- grouting pressure theoretical value, q '-slip casting rates, the corresponding slurries diffusion length of Z-grouting pressure, rm- slurry
Liquid spreads plane of symmetry position, R-circular passage lateral wall radius, r-madial wall radius, r0- slip casting pore radius, pw- underground water
Hydrostatic pressure, μ0- slurries initial viscosity, k and n-slurry viscosity time-varying parameter, Rr indicate the product of R and r；
D. the grouting pressure theoretical value based on slip casting process control calculates：Governing equation, which is spread, according to slip casting calculates grouting pressure reason
By maximum value；
E. the limit grouting pressure based on slip casting security control calculates：It analyzes the lower borehole wall of slip casting effect and surrouding rock deformation and destroys special
Sign determines that the slip casting of freezing hole circular passage blocks limit grouting pressure value；
F. slip casting section is chosen and final grouting pressure is determined with spacing of wells design value：Analyze unclosed section of circular passage of freezing hole ground
Layer lithology and underground water hydrostatic pressing force value determine Grouting engineering Work sectors and final grouting pressure and slip casting pitch of holes；
G. slip casting course control method for use is formulated：During slip casting control is proposed with when slip casting rate by adjusting injecting paste material in real time
Property grouting method processed, makes grouting pressure be within zone of reasonableness, control grout mixing and guarantee adjoining rock stability；
H. slip casting ending standard is formulated：Single slip casting termination condition is proposed based on slip casting rate, grouting pressure and slip casting time；
I. freezing hole annular causes calamity channel grouting treatment conceptual design：Terminate from injecting paste material selection, grouting pressure control, slip casting
Grouting program is formulated in standard determination, injected hole arrangement, slip casting process control etc..
2. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that pit shaft freezing sinking technique data and Surrounding Rock Engineering Geological Conditions, which are analyzed, in the step A specifically includes：
Pit shaft freezing method construction information is collected comprehensively, and grasp is freezed hole number, arrangement, the depth of freezing, freezing hole and freezed
Pipe size, freezing hole encapsulation situations and the unclosed area's formation lithology structure feature of freezing hole；It is obtained according to pilot hole of shaft
Core makes rock sample, tests the basic mechanical parameter of Different Strata, including uniaxial compressive strength, uniaxial tensile strength, interior
Poly- power and internal friction angle provide parameter for the research of slip casting diffusion theory and Three-Dimensional Numerical Analysis model foundation.
3. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that typical injecting paste material physicochemical property, which is tested, in the step B specifically includes：Common cement single slurry is prevented with mine water disaster
It is object with cement-sodium silicate double liquid, carries out indoor slurries gel test, measure the presetting period for not having to proportioning slurries；Institute
The cement single slurry stated refers to slurries made of being stirred by dry cement and water, and proportioning is indicated with ratio of mud w/s, refers to slurry
The mass ratio of dry cement and water in liquid；The cement-sodium silicate double liquid refer to by cement single slurry and waterglass mixing and
At slurries, proportioning C:S is indicated, refers to the volume ratio of cement single slurry and waterglass slurry in slurries；When the described initial set
Between refer to the River Bank Stability moment from, the solid corresponding time is converted by liquid due to viscosity increases；It is tried by viscosity test
The viscosity versus time curve for obtaining cement-water-clay system is tested, viscosity time-varying function is obtained after data are fitted.
4. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that the grouting pressure theoretical value based on slip casting process control is calculated and specifically included in the step D：
It analyzes circular passage slip casting and spreads governing equation, determine the principal element for influencing slurries diffusion process, obtain viscosity time-varying
Grouting pressure component part during slurries slip casting, the viscosity time dependent grout refers to cement-sodium silicate double liquid, described
Grouting pressure be made of diffusion region slurries viscous force, slurries and circular passage sidewall friction power and hydrostatic pressure；Theory analysis
In, circular passage side wall is assumed to be shiny surface, therefore slurries are negligible with channel side wall frictional force；According to research area circular passage ruler
Very little and initial slip casting rate calculates under the conditions of Practical Project maximum viscous force in cement-sodium silicate double liquid diffusion process, works as note
After slurry area's hydrostatic pressure measures, grouting pressure theoretical value can acquire；The circular passage size refers to that circular passage is cross-section
Face exradius and inner circle radius；The slip casting rate refers to the grouting amount being injected into the unit interval in circular passage；Institute
The maximum viscous force stated refers to the sum of cement-sodium silicate double liquid presetting period corresponding diffusion region slurries viscous force；Described
Grouting pressure theoretical value is equal to the sum of diffusion region slurries maximum viscous force and slip casting area hydrostatic pressure.
5. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that the limit grouting pressure based on slip casting security control calculates specific as follows in the step E：
The rock basic mechanical parameter measured according to step A establishes freezing hole circular passage note in conjunction with pit shaft formation lithology structure
Slurry blocks Three-Dimensional Numerical Analysis model, the borehole wall and surrouding rock deformation and failure law under different grouting pressures is analyzed, by slip casting process
The middle borehole wall generates the grouting pressure obviously deformed and is determined as limit grouting pressure, and grouting pressure cannot be more than to be somebody's turn to do in Grouting engineering
Grouting pressure.
6. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that the selection of slip casting section and final grouting pressure determine specific as follows with the spacing of wells in the step F：
Draw unclosed section of hole of pit shaft freezing large scale hydrogeological profile, the selection ground that thickness is stable, water isolating is good
Layer is used as mortar depositing construction region；Mortar depositing construction local ground watering hydrostatic pressure is determined according to mine hydrogeology peephole, accordingly
Determine grouting pressure theoretical value.Consider grouting pressure theoretical value and limit grouting pressure, determines the slip casting in Grouting engineering
Final pressure；
The final grouting pressure determines that principle is：If final grouting pressure theoretical value is less than limit grouting pressure, final grouting pressure is chosen
Theoretical value is final grouting pressure design value；Otherwise using limit grouting pressure as final grouting pressure design value；Controlling party is spread according to slurries
Journey calculates slurries diffusion length corresponding with final grouting pressure design value, and in this, as the adjacent of the same circular passage of closure
Slip casting pitch of holes.
7. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that slip casting course control method for use is formulated and specifically included in the step G：
Spread governing equation according to slip casting, grout coordinate ratio and slip casting rate be in Grouting engineering can taking human as two of control because
Element proposes that material mixture ratio dynamic regulation and slip casting velocity gradient control technology are used for slip casting process control with this；
The material mixture ratio dynamic adjustment technique refers to the volume ratio of interval change cement mortar and waterglass, and it is solid to improve slurries
Change reaction rate, make to inject dual slurry PhastGel in channel in advance, reduces the flowable cross-sectional area of slurries, it can be achieved that crossing water
Channel quick blocking, and control slurries diffusion length；Or the intermittent adjustment cement single slurry ratio of mud, change slurry viscosity with
The variation characteristic of time.
8. freeze sinking construction pit shaft annular as claimed in claim 7 causes calamity channel grouting treatment design method, feature
It is that the slip casting velocity gradient control technology refers to that slip casting selects larger initial slip casting rate early period, when grouting pressure is steady
After fixed, slip casting rate is continuously decreased, gluing between gelinite and circular passage palisades is fully blocked and improve conducive to circular passage
Knot ability.
9. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that slip casting ending standard is formulated and specifically included in the step H：
After injection cement single slurry reaches final pressure, slip casting rate is reduced to 50~60L/min and stablizes 30min, terminates slip casting；If
Slurries are cement-sodium silicate double liquid, and grouting pressure reaches final pressure, and total slip casting rate of two kinds of slurries be down to 100L~
200L/min and stable 30min, terminate slip casting.
10. freeze sinking construction pit shaft annular as described in claim 1 causes calamity channel grouting treatment design method, feature
It is that grouting program, which designs, in the step I includes：
From the selection of injecting paste material proportioning, grouting pressure control, slip casting ending standard is determining, injected hole is arranged, slip casting process control
Aspect formulates grouting program, carries out grouting treatment engineering in slip casting region according to the program, and adjust in time according to slip casting process
Whole grouting design scheme.
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