CN104880544B - To the methods of testing and evaluating of weak surrounding rock grouting consolidation effect in underground works - Google Patents
To the methods of testing and evaluating of weak surrounding rock grouting consolidation effect in underground works Download PDFInfo
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Abstract
The invention discloses the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in a kind of underground works, it is primarily of σ-D curve method, surrounding rock consolidation average out to scale value computing method, grouting consolidation effect compliance rate computing method, grouting consolidation effect index coefficient calculations method, assists and is made up of borehole television and geological radar combined imaging observation method.The data of foundation of the present invention are comprehensively reliable, can not only to be spread the slurries of weak surrounding rock by borehole television and geological radar and rock improvement situation carries out visual qualitative analysis, simultaneously by grouting consolidation effect index coefficient calculations method and the quantitative reinforcement degree obtaining different depth country rock entirety of grouting consolidation effect compliance rate computing method, improve systematicness and the science of assessment result, for the assessment of underground works especially when weak surrounding rock carries out grouting and reinforcing construction for slip casting effect provides foundation, the evaluation work for weak surrounding rock grouting consolidation effect can be instructed.
Description
Technical field
The invention belongs to security technology area in underground works, particularly in underground works to the methods of testing and evaluating of weak surrounding rock grouting consolidation effect.
Background technology
At present, when running into the unfavorable geologic body such as weak surrounding rock in underground chamber tunneling construction process, usually adopt the method for slip casting make broken loosened rock and slurries cementing after become entirety, the loose crushed stone of country rock itself is changed by the cohesive action of injection slurry, realize the object increasing Surrounding Rock Strength, be proven and to change Surrounding Rock Strength, performance country rock self bearing capacity, guarantee underground chamber, there is safely good effect by carrying out slip casting to weak surrounding rock.But because difference is constructed the complicacy of regional geologic condition and construction quality uncertainty to a certain extent, make underground chamber must carry out accurate quantitatively check and evaluation to the effect of grouting and reinforcing before continuation driving, the method that traditional assessment for country rock consolidation effect after wall rock grouting is commonly used has transient electromagnetic method, geological radar method, probing method, but this several method exists following problem:
1. because the complicacy of construction field geology condition adopts transient electromagnetic method and geological radar method to be often difficult to obtain result accurately.
2., when running into periphery and having large metal construction or low resistivity zone mineralized belt, the data that transient electromagnetic method measures can not use.
3. transient electromagnetic method and geological radar method can only analyze judgement to the weak surrounding rock after reinforcing by image qualitatively, cannot realize the accurate quantitative analysis to consolidation effect.
4. use probing method to get core from scene to showing that the time interval of laboratory report is long, the serious progress constraining construction, adds constuction budget cost.
5. when the troublesome zone drilling of weak broken, core recovery and integrality are difficult to ensure, thus cannot draw the physical property when formation and mechanics parameter.
6., simultaneously because institute's coring has departed from the constraint conditions such as original environmental stress, temperature, well can not represent the intensity of rock mass itself.
Summary of the invention
Given this, in order to solve the problem, the invention provides a kind of appraisal procedure to weak surrounding rock grouting consolidation effect based on Surrounding Rock Strength achievement data, by gathering the Surrounding Rock Strength of weak surrounding rock before and after grouting and reinforcing, comprehensively analyze contrast, realize the concrete effect after to weak surrounding rock grouting and reinforcing and carry out simply, fast and accurately assessing.
In order to realize this object, the present invention adopts following technical scheme:
Comprise the following steps:
Step 1: determine surrounding rock consolidation average out to scale value λ and slip casting effect compliance rate acceptance value N;
Step 2: for surrounding rock consolidation section, obtains surrounding rock consolidation mean value Δ and slip casting effect compliance rate M;
Step 3: respectively surrounding rock consolidation average out to scale value λ and surrounding rock consolidation mean value Δ, slip casting effect compliance rate acceptance value N and slip casting effect compliance rate M are contrasted;
Wherein, when described surrounding rock consolidation mean value Δ be less than described surrounding rock consolidation average out to scale value λ or described slip casting effect compliance rate M be less than described slip casting effect compliance rate acceptance value N time, slip casting effect is defective, need to mend slurry, when two conditions are all up to standard, slip casting effect is qualified, does not need to mend slurry.
In step 1, when surrouding rock deformation just meets surrouding rock deformation desired value, described surrounding rock consolidation average out to scale value λ using the surrounding rock consolidation mean value Δ corresponding to this test section country rock as its value, described slip casting effect compliance rate acceptance value N using the slip casting effect compliance rate M corresponding to this test section country rock as its value, described Surrounding Rock Strength desired value using the Surrounding Rock Strength mean value corresponding to this test section country rock as its value.
In step 1, described surrouding rock deformation just meets surrouding rock deformation desired value, comprises meeting country rock convergence displacement deformation value simultaneously and belonging to country rock convergent deformation desired value scope and country rock average displacement deformation values belongs to country rock average deformation desired value scope.
In step 1, described slip casting effect compliance rate is reach the accumulative country rock thickness of Surrounding Rock Strength desired value and the ratio of grouting reinforcement rock thickness.
In step 1, described surrounding rock consolidation average out to scale value λ and described slip casting effect compliance rate acceptance value N is by needing some the test section country rocks improving Surrounding Rock Strength to obtain through overtesting.
In step 1, the acquisition scope of described test section country rock is drawn by the empirical value of numerical analysis or engineering practice; Described test section country rock to choose length identical, the location that rock property is roughly the same in cavern is chosen at a certain distance.
In step 1, described average displacement deformation values is obtained by the multipoint displacement meter monitoring system being laid in test section country rock, and the described convergence displacement deformation value on different tests section country rock crag is recorded by country rock convergence instrument; The acquisition of described data is at the laggard line operate of grouting and reinforcing certain hour respectively test section country rock every section described being carried out to different grouting amount.
In step 1, described average displacement deformation values
for the mean value of the displacement deformation value at same boring different depth place, described average displacement deformation values
drawn as calculated with the D-ξ curve of change in depth by drafting surrounding rock displacement deformation values ξ:
Wherein surrounding rock displacement deformation values ξ
1, ξ
2, ξ
3corresponding different degree of depth D
1, D
2, D
3, surrounding rock displacement deformation values ξ is recorded by the multipoint displacement meter monitoring system laid in different tests section.
In step 1, the convergent deformation value of described country rock equals this process of country rock convergent deformation desired value by adopting folder method of forcing to obtain at test section country rock.
In step 2, described surrounding rock consolidation mean value Δ is the mean value of different depth place surrounding rock consolidation index coefficient, and described surrounding rock consolidation index coefficient is the ratio of Surrounding Rock Strength before Surrounding Rock Strength added value after slip casting and slip casting.
In step 2, described Surrounding Rock Strength mean value is the mean value of same boring different depth place Surrounding Rock Strength; The curve that described Surrounding Rock Strength mean value changes with degree of depth D by drawing Surrounding Rock Strength σ, namely σ-D curve obtains.
In step 2, described σ-D curve utilizes digitizing Surrounding Rock Strength Analytical system to obtain; Wherein, the degree of depth D of described rock stratum is obtained by the laser range finder record be loaded on rig; Before and after slip casting different depth described Surrounding Rock Strength by by the axial pressure of country rock, rotating speed, perforation rate, creep into compare than the parameters such as merit and Surrounding Rock Strength database and obtain; Described axial pressure is recorded by the axial compression sensor be arranged on drill bit; Described rotating speed is recorded by speed probe; Described perforation rate is recorded by laser range finder and time recorder cooperation.
In step 2, described Surrounding Rock Strength database is by doing a large amount of comprehensively experiment, when creeping into all kinds of rock stratum according to record rig the rig that sensor records the data such as moment of torsion, rotating speed, axial pressure and know by inference creep into than data such as merits, the relation that the intensity of each class surrounding rock set up is corresponding with drilling parameter.
In step 2, described slip casting effect compliance rate M is obtained by following formula:
M＝H
1/H×100％
Wherein, H
1for reaching the country rock cumulative thickness of expection intensity, it utilizes described σ-D curve and Surrounding Rock Strength desired value to carry out contrast and draws, H is grouting and reinforcing section country rock thickness, is recorded by laser range finder.
Described grouting and reinforcing section country rock thickness, is detected by geological radar method and obtains.
Described grouting and reinforcing section country rock thickness, is detected by borehole television and obtains.
In step 2, described surrounding rock consolidation mean value is obtained by following formula:
Δ＝(K
D1+K
D2+K
D3+...+K
DN)/N
Wherein, K
dNfor surrounding rock consolidation index coefficient, described surrounding rock consolidation index coefficient is obtained by following formula:
K
DN＝|σ
DN-2-σ
DN-1|/σ
DN-1×100％(N＝1,2,3...)
Wherein, σ
dN-1for original weak surrounding rock intensity, σ
dN-2for the reinforce adjoining rock intensity after slip casting; Different depth D
1, D
2, D
3... corresponding original weak surrounding rock intensity σ
d1-1, σ
d2-1, σ
d3-1..., and the reinforce adjoining rock intensity σ after slip casting
d1-2, σ
d2-2, σ
d3-2....
In step 3, the equipment such as borehole television and geological radar is utilized to carry out to injection slurry range of scatter and country rock the collection that the reinforcing state after slip casting carries out image, data, the effect of analysis and evaluation weak surrounding rock grouting and reinforcing qualitatively.
Obtain the folder method of forcing that surrouding rock deformation value just meets surrouding rock deformation desired value to comprise: the convergent deformation amount of different tests section country rock, average displacement deformation values are contrasted with the scope of convergent deformation desired value and average deformation desired value respectively, judge that grouting consolidation effect is qualified simultaneously when meeting and calculate the reinforcing mean value Δ of country rock under different grouting amount
1, Δ
2...; Choose the minimum reinforcing mean value Δ that grouting consolidation effect is qualified
xmaximum reinforcing mean value Δ underproof with grouting consolidation effect
y, at Δ
xwith Δ
ybetween utilize dichotomy to determine average index is reinforced in test, again choose test section and carry out grouting and reinforcing test and assess slip casting effect, repeat above-mentioned steps and can press from both sides gradually to force and obtain the state that surrouding rock deformation value just meets surrouding rock deformation desired value.
Beneficial effect of the present invention is:
The present invention is made up of σ-D curve method, grouting consolidation effect compliance rate computing method, grouting consolidation effect index coefficient calculations method, borehole television and geological radar combined imaging observation method.
Digitizing Surrounding Rock Strength is utilized to creep into Analytical system (DRST system), the degree of depth of rock stratum and the drilling parameter of rig is crept into when can record and not carry out grouting and reinforcing by sensor, compare with Surrounding Rock Strength database, directly draw the Surrounding Rock Strength of different depth, core is got at the scene of instead of, this step of shop experiment, both saved and got core to the time drawing test report from scene, turn avoid institute's coring and depart from original environmental stress, the constraint conditions such as temperature, well can not represent the problem of the intensity of rock mass own, solve core recovery and integrality when the troublesome zone drilling of weak broken to be difficult to ensure, thus the physical property when formation and this difficult problem of mechanics parameter cannot be drawn, make measured Surrounding Rock Strength reliably more scientific.
Utilize the curve that the data obtained drafting Surrounding Rock Strength σ changes with degree of depth D, and judge whether to need to carry out grouting and reinforcing, the method is applicable to various complex geological condition, the complicacy overcome due to construction field geology condition adopts transient electromagnetic method and geological radar method to be often difficult to obtain result accurately, with when running into periphery and having large metal construction or low resistivity zone mineralized belt, the not spendable defect of the data that transient electromagnetic method measures.
After grouting and reinforcing is carried out to the weak surrounding rock needed reinforcement, determining detect sampling point and hole in place at a certain distance apart from grouting hole, after drawing grouting and reinforcing different depth rock stratum Surrounding Rock Strength and draw the curve of country rock intensity change in depth before and after grouting and reinforcing, the effect of grouting and reinforcing can be reflected intuitively by σ-D curve method, calculate slip casting effect compliance rate, for qualitative assessment grouting consolidation effect provides foundation simultaneously.
The data of Surrounding Rock Strength before and after the slip casting that collects in same depth before and after slip casting are utilized to calculate the reinforcing index coefficient of different depth country rock, carry out qualitative assessment grouting consolidation effect by the mean value and value up to standard that contrast different depth surrounding rock consolidation index coefficient, make appraisal procedure reliably more scientific.
The equipment such as borehole television and geological radar is utilized to carry out to injection slurry range of scatter and country rock the collection that the reinforcing state after slip casting carries out image, data, slip casting effect is represented more intuitively, and synchronously can realize the grouting consolidation effect of qualitative analysis assessment weak surrounding rock.
Owing to taking technique scheme, can not only to be spread the slurries of weak surrounding rock by borehole television and geological radar and rock improvement situation carries out visual qualitative analysis, pass through the reinforcement degree of grouting consolidation effect index coefficient calculations method and grouting consolidation effect compliance rate computing method quantitative test different depth country rock entirety simultaneously
The data of foundation of the present invention are comprehensively reliable, can not only to be spread the slurries of weak surrounding rock by borehole television and geological radar and rock improvement situation carries out visual qualitative analysis, simultaneously by grouting consolidation effect index coefficient calculations method and the quantitative reinforcement degree obtaining different depth country rock entirety of grouting consolidation effect compliance rate computing method, be conducive to the qualitative assessment to grouting consolidation effect; Use DRST system, not only improve the reliability measuring Surrounding Rock Strength, also save the time of core boring sampling, substantially increase production efficiency, saved great amount of cost.
Put forward systematicness and the science of the present invention's high assessment result, for the assessment of underground works especially when weak surrounding rock carries out grouting and reinforcing construction for slip casting effect provides foundation, the evaluation work for weak surrounding rock grouting consolidation effect can be instructed.
Accompanying drawing explanation
Fig. 1 is effect schematic diagram of the present invention;
Fig. 2 is operation of the present invention and flow chart of data processing figure.
Embodiment
Below in conjunction with accompanying drawing and implementation step, the present invention is described further:
Composition graphs 1, Fig. 2, the present invention is to the assay method of the slip casting effect of weak surrounding rock, comprise and use rig, digitizing Surrounding Rock Strength to creep into Analytical system, borehole television and geological radar, the impact of characteristic on driller parameters is crept in order to what eliminate different rig, the present invention is unified adopts all-hydraulic impact rotating churn, adopt the mode of gases at high pressure deslagging, the bore diameter of 50-100mm.
Concrete steps are as follows:
A. surrounding rock consolidation average out to scale value λ and slip casting effect compliance rate acceptance value N is determined.The approximate range of desirable strength increase rate is drawn by numerical simulation and empirical value, the test section of equal length is chosen in the location that rock property is roughly the same in underground works at a certain distance, respectively every section of test section country rock is carried out to the grouting and reinforcing operation of different grouting amount, adopt the folder of dichotomy to force method, obtain the state when surrouding rock deformation just meets surrouding rock deformation desired value.Utilize digitizing Surrounding Rock Strength to creep into data that Analytical system (DRST system) measures the monitoring point intensity change in depth before and after grouting and reinforcing, and draw σ-D curve.Wherein the degree of depth is D
1, D
2, D
3... before corresponding reinforcing, Surrounding Rock Strength is σ
d1-1, σ
d2-1, σ
d3-1..., after corresponding reinforcing, Surrounding Rock Strength is σ
d1-2, σ
d2-2, σ
d3-2....Calculate the reinforcing index coefficient of different depth:
K
DN＝|σ
DN-2-σ
DN-1|/σ
DN-1×100％(N＝1,2,3...)
According to the reinforcing index coefficient calculations surrounding rock consolidation mean value of different depth
Δ＝(K
D1+K
D2+K
D3+...+K
DN)/N
The surrounding rock consolidation mean value △ of state when surrouding rock deformation just being met surrouding rock deformation desired value is as surrounding rock consolidation average out to scale value λ; By the mean value of different depth Surrounding Rock Strength after the slip casting under this state as Surrounding Rock Strength desired value.
According to the σ-D curve under this obtained state and Surrounding Rock Strength desired value, obtain the accumulative country rock thickness H1 reaching Surrounding Rock Strength desired value in reinforcing scope, obtaining slip casting effect compliance rate acceptance value N with this is:
N＝H
1/H×100％
Wherein H is grouting reinforcement rock gross thickness.
Described surrouding rock deformation comprises convergent deformation amount, the average displacement deformation values of country rock, being the convergent deformation amount being recorded different tests section country rock by country rock convergence instrument, each test section different depth D can being obtained by laying multipoint displacement meter monitoring system in different tests section
1, D
2, D
3... corresponding surrounding rock displacement distortion ξ
1, ξ
2, ξ
3..., draw the D-ξ curve of surrounding rock displacement distortion with change in depth, and calculate the average displacement deformation values of different depth country rock
the convergent deformation amount of different tests section country rock, average displacement deformation values are contrasted with the scope of convergent deformation desired value and average deformation desired value respectively, judges that grouting consolidation effect is qualified simultaneously when meeting and calculate the reinforcing mean value Δ of country rock under different grouting amount
1, Δ
2....Choose the minimum reinforcing mean value Δ that grouting consolidation effect is qualified
xmaximum reinforcing mean value Δ underproof with grouting consolidation effect
y, at Δ
xwith Δ
ybetween utilize dichotomy determine test reinforce average index, again choose test section carry out grouting and reinforcing test and assess slip casting effect, repetition above-mentioned steps can be pressed from both sides gradually and be forced the Surrounding Rock Strength mean value after obtaining surrounding rock consolidation average out to scale value λ and country rock expection reinforcement, i.e. Surrounding Rock Strength desired value.
Described digitizing Surrounding Rock Strength creeps into the method that Analytical system (DRST system) measures σ-D curve, be the degree of depth being recorded each rock stratum by the laser range finder be installed on rig, rotating speed, laser range finder and time recorder that the axial pressure recorded by the axial compression sensor be arranged on drill bit, speed probe are recorded coordinate the perforation rate that records and creeping into of knowing by inference to compare than the parameters such as merit and Surrounding Rock Strength database to obtain different depth and obtain Surrounding Rock Strength;
Described Surrounding Rock Strength database is by doing a large amount of comprehensively experiment, when record rig creeps into all kinds of rock stratum the rig that sensor records the data such as moment of torsion, rotating speed, axial pressure and know by inference creep into than data such as merits, set up the relation that the intensity of each class surrounding rock is corresponding with drilling parameter.
B. preliminary bracing is carried out to the underground chamber after excavation.
C. first carry out the prospecting to weak surrounding rock, Underground Tunnels locular wall determined bore detecting point, rig in sensing point drilling process, utilize digitizing Surrounding Rock Strength to creep into Surrounding Rock Strength that Analytical system (DRST system) draws the rock stratum of different depth.Surrounding Rock Strength σ when utilizing the data obtained to draw non-slip casting
1with the curve of degree of depth D change, and determine the scope of weak surrounding rock.
D., after slip casting maintenance being implemented to weak surrounding rock, within the scope of slip casting influence depth, several instrument connections are bored, according to on-site actual situations determination hole depth.
E. utilize digitizing Surrounding Rock Strength to creep into Surrounding Rock Strength that Analytical system (DRST system) draws different depth rock stratum after grouting and reinforcing, and Surrounding Rock Strength σ after drawing grouting and reinforcing
2with the curve of degree of depth D change.
F., before grouting and reinforcing not being carried out to weak surrounding rock, different depth D is obtained by drill bit creeping in weak surrounding rock
1, D
2, D
3... corresponding Surrounding Rock Strength σ
d1-1, σ
d2-1, σ
d3-1..., slip casting carried out to weak surrounding rock and after certain hour of being separated by, work is crept into the country rock after carrying out grouting and reinforcing, drawing the Surrounding Rock Strength σ at same depth place after reinforcing
d1-2, σ
d2-2, σ
d3-2..., obtain surrounding rock consolidation index coefficient
K
DN＝|σ
DN-2-σ
DN-1|/σ
DN-1×100％(N＝1,2,3...)
Utilize the data of Surrounding Rock Strength before and after the slip casting that collects in same depth before and after slip casting can calculate the reinforcing index coefficient of different depth country rock, obtain surrounding rock consolidation mean value with this
Δ＝(K
D1+K
D2+K
D3+...+K
DN)/N
Contrast with surrounding rock consolidation average out to scale value λ, as Δ > λ, judge that slip casting effect is qualified, otherwise carry out benefit slurry.
G. the desired value of the σ-D curve obtained before and after slip casting and Surrounding Rock Strength is contrasted, draw the accumulation country rock thickness H1 reaching expection intensity, in conjunction with grouting reinforcement rock gross thickness H, obtain slip casting effect compliance rate M=H
1/ H × 100%
Contrast with slip casting effect compliance rate acceptance value N, as M>N, judge that slip casting effect is qualified.
H. the equipment such as borehole television and geological radar is utilized to carry out to injection slurry range of scatter and country rock the collection that the reinforcing state after slip casting carries out image, data, the effect of analysis and evaluation weak surrounding rock grouting and reinforcing qualitatively.
The method qualitative assessment grouting consolidation effect such as the σ-D curve method i. before and after comprehensive grouting, grouting consolidation effect compliance rate computing method, grouting consolidation effect index coefficient calculations method, σ-D curve comparison before and after slip casting is qualified, surrounding rock consolidation mean value Δ is greater than surrounding rock consolidation value λ up to standard, judge that slip casting effect qualified when slip casting effect compliance rate M is greater than slip casting effect compliance rate acceptance value N simultaneously, if there is an index defective, carry out benefit slurry.Utilize borehole television and geological radar to carry out assistant visualizing to surrounding rock consolidation effect in instrument connection to observe to judge whether slip casting produces a desired effect simultaneously, and the need of benefit slurry.
Embodiment 2
Step a-b method is the same.
C. carry out the prospecting to weak surrounding rock, adopt traditional bore extracting core process, the Surrounding Rock Strength at test different depth place.According to engineering analog method and Method for Numerical, determine the scope of weak surrounding rock.
D., after slip casting maintenance being implemented to weak surrounding rock, core is got, by the surrounding rock consolidation intensity at shop experiment determination different depth place in the internal drilling of slip casting influence depth scope.
E. surrounding rock consolidation mean value Δ and slip casting effect compliance rate M is measured.
F. surrounding rock consolidation average out to scale value λ and surrounding rock consolidation mean value Δ, slip casting effect compliance rate acceptance value N and slip casting effect compliance rate M is compared, when surrounding rock consolidation mean value Δ be less than described surrounding rock consolidation average out to scale value λ or described slip casting effect compliance rate M be less than described slip casting effect compliance rate acceptance value N time, slip casting effect is defective, need to mend slurry, when two conditions are all up to standard, slip casting effect is qualified, does not need to mend slurry.
Claims (12)
1. in underground works to the methods of testing and evaluating of weak surrounding rock grouting consolidation effect, it is characterized in that, comprise the following steps:
Step 1: determine surrounding rock consolidation average out to scale value λ and slip casting effect compliance rate acceptance value N;
Step 2: for surrounding rock consolidation section, obtains surrounding rock consolidation mean value Δ and slip casting effect compliance rate M;
Step 3: respectively surrounding rock consolidation average out to scale value λ and surrounding rock consolidation mean value Δ, slip casting effect compliance rate acceptance value N and slip casting effect compliance rate M are contrasted;
Wherein, when described surrounding rock consolidation mean value Δ be less than described surrounding rock consolidation average out to scale value λ or described slip casting effect compliance rate M be less than described slip casting effect compliance rate acceptance value N time, slip casting effect is defective, need to mend slurry, when two conditions are all up to standard, slip casting effect is qualified, does not need to mend slurry;
In described step 1, when surrouding rock deformation just meets surrouding rock deformation desired value, described surrounding rock consolidation average out to scale value λ using the surrounding rock consolidation mean value Δ corresponding to this test section country rock as its value, described slip casting effect compliance rate acceptance value N using the slip casting effect compliance rate M corresponding to this test section country rock as its value, described Surrounding Rock Strength desired value using the Surrounding Rock Strength mean value corresponding to this test section country rock as its value.
2. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 1, it is characterized in that: in step 1, described surrouding rock deformation just meets surrouding rock deformation desired value, comprise and meet country rock convergence displacement deformation value simultaneously and belong to country rock convergent deformation desired value scope and country rock average displacement deformation values belongs to country rock average deformation desired value scope, the convergent deformation value of described country rock equals this process of country rock convergent deformation desired value by obtaining in test section country rock employing folder method of forcing; Described slip casting effect compliance rate is reach the accumulative country rock thickness of Surrounding Rock Strength desired value and the ratio of grouting reinforcement rock thickness.
3. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 1, it is characterized in that: in step 1, described surrounding rock consolidation average out to scale value λ and described slip casting effect compliance rate acceptance value N is by needing some the test section country rocks improving Surrounding Rock Strength to obtain through overtesting; The acquisition scope of described test section country rock is drawn by the empirical value of numerical analysis or engineering practice; Described test section country rock to choose length identical, the location that rock property is roughly the same in cavern is chosen at a certain distance.
4. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 2, it is characterized in that: in step 1, described average displacement deformation values is obtained by the multipoint displacement meter monitoring system being laid in test section country rock, and the described convergence displacement deformation value on different tests section country rock crag is recorded by country rock convergence instrument; The acquisition of described data is at the laggard line operate of grouting and reinforcing certain hour respectively test section country rock every section described being carried out to different grouting amount.
5. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 4, is characterized in that: in step 1, described average displacement deformation values
for the mean value of the displacement deformation value at same boring different depth place, described average displacement deformation values
drawn as calculated with the D-ξ curve of change in depth by drafting surrounding rock displacement deformation values ξ:
Wherein surrounding rock displacement deformation values ξ
1, ξ
2, ξ
3corresponding different degree of depth D
1, D
2, D
3surrounding rock displacement deformation values ξ is recorded by the multipoint displacement meter monitoring system laid in different tests section.
6. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 1, it is characterized in that: in step 2, described surrounding rock consolidation mean value Δ is the mean value of different depth place surrounding rock consolidation index coefficient, and described surrounding rock consolidation index coefficient is the ratio of Surrounding Rock Strength before Surrounding Rock Strength added value after slip casting and slip casting; Described Surrounding Rock Strength mean value is the mean value of same boring different depth place Surrounding Rock Strength; The curve that described Surrounding Rock Strength mean value changes with degree of depth D by drawing Surrounding Rock Strength σ, namely σ-D curve obtains.
7. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 6, is characterized in that: in step 2, and described σ-D curve utilizes digitizing Surrounding Rock Strength Analytical system to obtain; Wherein, the degree of depth D of described rock stratum is obtained by the laser range finder record be loaded on rig; Before and after slip casting different depth described Surrounding Rock Strength by by the axial pressure of country rock, rotating speed, perforation rate, creep into compare than merit parameter and Surrounding Rock Strength database and obtain; Described axial pressure is recorded by the axial compression sensor be arranged on drill bit; Described rotating speed is recorded by speed probe; Described perforation rate and creeping into of knowing by inference to be coordinated by laser range finder and time recorder than merit and record.
8. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 7, it is characterized in that: in step 2, described Surrounding Rock Strength database is by doing a large amount of comprehensively experiment, when creeping into all kinds of rock stratum according to record rig the moment of torsion of the rig that sensor records, rotating speed, axial pressure data and know by inference creep into than merit data, the relation that the intensity of each class surrounding rock set up is corresponding with drilling parameter.
9. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 6, is characterized in that: in step 2, and described slip casting effect compliance rate M is obtained by following formula:
M＝H
1/H×100％
Wherein, H
1for reaching the country rock cumulative thickness of expection intensity, it utilizes described σ-D curve and Surrounding Rock Strength desired value to carry out contrast and draws, H is grouting and reinforcing section country rock thickness, is recorded by laser range finder.
10. the methods of testing and evaluating to weak surrounding rock grouting consolidation effect in underground works according to claim 1, is characterized in that: in step 2, and described surrounding rock consolidation mean value is obtained by following formula:
Δ＝(K
D1+K
D2+K
D3+...+K
DN)/N
Wherein, K
dNfor surrounding rock consolidation index coefficient, described surrounding rock consolidation index coefficient is obtained by following formula:
K
DN＝|σ
DN-2-σ
DN-1|/σ
DN-1×100％(N＝1,2,3...)
Wherein, σ
dN-1for original weak surrounding rock intensity, σ
dN-2for the reinforce adjoining rock intensity after slip casting; Different depth D
1, D
2, D
3d
ncorresponding original weak surrounding rock intensity σ
d1-1, σ
d2-1, σ
d3-1σ
dN-1, and the reinforce adjoining rock intensity σ after slip casting
d1-2, σ
d2-2, σ
d3-2σ
dN-2.
Methods of testing and evaluating to weak surrounding rock grouting consolidation effect in 11. underground workss according to claim 1, it is characterized in that: in step 3, borehole television and geological radar equipment is utilized to carry out to injection slurry range of scatter and country rock the collection that the reinforcing state after slip casting carries out image, data, the effect of analysis and evaluation weak surrounding rock grouting and reinforcing qualitatively.
Methods of testing and evaluating to weak surrounding rock grouting consolidation effect in 12. underground workss according to claim 1, it is characterized in that: the folder method of forcing that acquisition surrouding rock deformation value just meets surrouding rock deformation desired value is, the convergent deformation amount of different tests section country rock, average displacement deformation values are contrasted with the scope of convergent deformation desired value and average deformation desired value respectively, judge that grouting consolidation effect is qualified simultaneously when meeting and calculate the reinforcing mean value Δ 1 of country rock under different grouting amount, Δ 2 Choose the minimum reinforcing mean value Δ that grouting consolidation effect is qualified
xmaximum reinforcing mean value Δ underproof with grouting consolidation effect
y, at Δ
xwith Δ
ybetween utilize dichotomy to determine average index is reinforced in test, again choose test section and carry out grouting and reinforcing test and assess slip casting effect, repeat above-mentioned steps and can press from both sides gradually to force and obtain the state that surrouding rock deformation value just meets surrouding rock deformation desired value.
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| CN201510154334.9A CN104880544B (en) | 2015-04-02 | 2015-04-02 | To the methods of testing and evaluating of weak surrounding rock grouting consolidation effect in underground works |
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| CN105589999B (en) * | 2015-12-23 | 2018-11-20 | 山东大学 | Determination method applied to underground engineering wall rock grouting program |
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