CN109344556A - A kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state - Google Patents
A kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state Download PDFInfo
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Abstract
The invention discloses a kind of earth pressure balanced shield, EPBS sediment improvement parameter correction methods based on live dregs state, the modifying agent used using the dregs of shield machine discharge and scene is sediment improvement test material, in place slump test is carried out, it flows mecystasis according to slump consistancy test and the apparent state evaluation of dregs；If dregs was improvement state, according to different dregs types is directed to, improved by the way of adjustment shield machine water injection rate and foam injection rate；If dregs is to owe improvement state, secondary improved test is carried out to dregs, until dregs state meets the requirements, according to water when the initial boring parameter of shield machine and secondary improvement and the additive amount of foam, revised sediment improvement parameter value is calculated.The present invention considers influence of the seepage effect to dregs moisture content in shield machine tunneling process, and can provide foundation to the dynamic adjustment of improvement parameter with the variation of formation condition in tunneling process, keeps improvement parameter setting more reasonable.
Description
Technical field
The invention belongs to Shield Construction Technique field more particularly to a kind of earth pressure balanced shield, EPBSs based on live dregs state
Sediment improvement parameter correction method.
Background technique
Due to earth pressure balanced shield, EPBS tunneling is small to surrounding environment influence, speed of application is fast and do not need large-scale place into
Row dregs post-processing can be effectively utilized the limited construction place in city, have become the first choice in Construction of City Tunnel
Type.However, its key smoothly tunneled is that shield dregs remains a kind of " Plastic Flow " state, built conducive to dregs in native storehouse
Effective soil pressure is found to balance face Water And Earth Pressures, at the same prevent and gush, cutterhead mud lining or Tu Cang occlusion the problems such as, really
Determine boring parameter to stablize within the scope of suitable.Due to through cutting bury original state dregs in storehouse be difficult to meet shield it is continual and steady
The demand of work must carry out sediment improvement, improve the stream plasticity of dregs.
To guarantee that shield machine can normally work, it would be desirable to all to adding among dregs according to the heterogeneity of dregs
If the modifying agent of foam, bentonite or the like is so that dregs remains ideal " Plastic Flow " state, to utilize dregs in soil
While establishing effective earth pressure balance in storehouse, avoid occur mud lining, gush, cutter is seriously worn, screw conveyor torque mistake
The problems such as big.
Patent 201410561509.3 is " a kind of using foam as the gummy formation earth pressure balanced shield, EPBS sediment improvement of additive
Parameter selection method " is fitted by curve math relational expression, is obtained the functional relation of Atterberg Limit and foam injection ratio and is collapsed
The functional relation of degree of falling and foam injection ratio, water content.Based on the requirement of plasticity index 0.4~0.75, water content is constructed
The relational expression between ratio is injected with foam, and is drawn in curve.Determine that best foam is infused by best slump range according to curve
Enter to compare range.
Patent 201510983075.0 " a kind of water-rich sand layer shield sediment improvement construction system and construction method " is for tool
The case history of body proposes corresponding improvement parameter, and the setting of parameter is by shield driver to dregs state in tunneling process
Determine dynamically to adjust modifying agent dosage.
Patent 201710595112.X " the sediment improvement method of high hydraulic pressure, Thief zone arenaceous stratum earth pressure balanced shield, EPBS " gives
The formula for high hydraulic pressure Thief zone arenaceous stratum bentonite slurry modifying agent is gone out, and mud is determined according to the water content of dregs
Injection rate.
Patent 201711331938.1 " earth pressure balanced shield, EPBS high permeability sand modification method " gives improvement highly permeable
The bentonite slurry of sandy soil matches, by the satisfactory state such as sediment improvement to mobility and permeability, according to dregs
State carries out real-time control use by the flow instrument of human-computer interface automatic control system.
Patent 201810153466.3 " gummy formation sediment improvement foaming agent additive amount determines method " uses linear regression
Method matched curve determines the relationship between soil body cohesive strength and the angle of external friction and foam ratio, and it is viscous with the soil body to be fitted the slump
Relationship between poly- power and the angle of external friction determines the optimal additive amount of foam.
Above-mentioned modification method is the evolutionary approach for being directed to certain special formation mostly, and such as rich water sand-pebble layer glues
Property stratum, compound stratum etc., method restricted application, the sediment improvement parameter mainly obtained by laboratory test is to be used for
Scene, suitable for matched site operations of factors such as grain compositions, material composition, moisture content with taken dregs.In shield
Formation condition changes correspondingly in tunneling process, it is clear that it is unreasonable that this improvement parameter, which is used for entire tunneling process,.
In addition, seepage effect can occur in shield machine tunneling process, the moisture content of the soil body can be changed correspondingly, and above-mentioned patent is simultaneously
Influence in this respect is not fully considered, the dregs state after improvement may be not satisfactory.After shield launching, it is only capable of passing through shield
Structure driver dynamically adjusts improvement parameter to the intuitive judgment of dregs stream mecystasis, fails systematically to be formed based on live dregs
The sediment improvement parameter of state determines quantitative approach, once error in judgement may generate greater risk hidden danger.
Summary of the invention
The application aims to solve at least one of the technical problems existing in the prior art.For this purpose, an object of the present invention
It is to provide a kind of a kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state.This method considers
Influence of the seepage effect to dregs moisture content in shield machine tunneling process, and can in tunneling process with the change of formation condition
Change and provide foundation to the dynamic adjustment of improvement parameter, keeps improvement parameter setting more reasonable, dregs is enabled to keep ideal plasticity stream
Dynamic state.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state, with shield machine discharge
Dregs and the modifying agent that uses of scene are sediment improvement test material, carry out in place slump test, according to slump consistancy test and
Its stream mecystasis of the apparent state evaluation of dregs；If dregs was improvement state, according to different dregs types is directed to, use
The mode of adjustment shield machine water injection rate and foam injection rate parameter value is improved；If dregs is to owe improvement state, dregs is obtained
And a certain amount of foam and the secondary improvement of water progress are added, until dregs state meets the requirements, according to the initial driving of shield machine
Revised sediment improvement parameter value is calculated in the additive amount of water and foam when parameter and secondary improvement.
Further, the detailed process of sediment improvement parameters revision are as follows: obtain dregs from belt conveyor and carry out scene
Slump consistancy test judges whether dregs mobility meets the requirements according to test result, on the basis of mobility judges, in conjunction with slag
Its mecystasis of the apparent state evaluation of soil, determines dregs slump value zone of reasonableness [Tmin, Tmax], it is then different for dregs
Stream mecystasis, using corresponding ameliorative measure:
Operating condition one: when dregs slump value is in [Tmin, Tmax] between, dregs mobility is suitable, but needs according to dregs
Plasticity, bleed, analysis foam situation carry out classification processing, and sediment improvement thinking is as follows:
If dregs is in ideal plasticity, dregs is not loose, no bleed, analysis foam situation, without correcting sediment improvement parameter；
If bleed phenomenon occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing water injection rate；For
Grittiness dregs increases foam injection rate while reducing water injection rate；
If the phenomenon that analysis foam occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing foam injection
Amount；For grittiness dregs, while reducing foam injection rate, water injection rate is reduced；
After above-mentioned sediment improvement correction strategy, takes belt conveyor outlet dregs to carry out slump consistancy test, judge it
Mecystasis is flowed, such as is still unsatisfactory for requiring, then continues to improve according to the above correction strategy, until dregs stream mecystasis is full
Until foot requires；
Operating condition two: when dregs slump value is greater than TmaxWhen, show that dregs mobility is excessive, sediment improvement thinking is as follows:
If dregs is in ideal plasticity state, no bleed, analysis frothing it is as follows to improve parameter estimate modification strategy: for viscosity
Dregs, while reducing foam injection rate and water injection rate；For grittiness dregs, water injection rate and appropriate reduction foam injection rate are reduced；
If bleed phenomenon occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing water injection rate and foam
Injection rate；For grittiness dregs, water injection rate is reduced；
If analysis frothing occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing foam injection
Amount；For grittiness dregs, reduces foam injection rate and suitably reduce water injection rate；
After above-mentioned sediment improvement correction strategy, enchashment field belt conveyor exports dregs and carries out slump consistancy test, sentences
Breaking, it flows mecystasis, such as is still unsatisfactory for requiring, then continues to improve according to the above correction strategy, until dregs stream plasticity shape
Until state is met the requirements；
Operating condition three: when dregs slump value is less than TminWhen, show dregs illiquidity, by increase water injection rate and/or
Foam injection rate improves dregs, until dregs stream plasticity is met the requirements；Pass through the water injection rate of improved test, foam
Injection ratio, driving speed carry out the sediment improvement parameter after inverse is optimized, and steps are as follows for calculating:
Step 1: it calculates proving ring and is averaged driving speed:
In formula, L is shield duct piece width, and t is the time for tunneling the ring；
Step 2: calculate the injection variable quantity of water:
In formula, △ VWaterThe water filling volume for needing to increase when to tunnel per minute, VWaterThe injected slurry volume of water, A are when to test
Shield machine excavation area, K are the coefficient of volumetric expansion；
Step 3: calculate the injection variable quantity of foam:
In formula, △ VfThe foam volume for needing to increase when to tunnel per minute, VfThe injected slurry volume of foam when to test.
Further, further include the steps that parameter setting after step 3:
1. the setting of water
If shield soil has water jet in storehouse, the increment relations of distribution of water are accounted for into 70%, Tu Cang water spray for cutterhead water spray and are accounted for
30%；
2. the setting of foam
If there is applicator in shield soil storehouse, the increment relations of distribution of foam are that the storehouse Tu Cang accounts for 30%, and cutter head foam accounts for
70%, wherein spout accounts for 40% at center, other spouts account for 30%；If there is no applicator, foam increment in shield soil storehouse
The cutter head center spout that is assigned as account for 50%, other spouts account for 50%.
Further, when dregs slump value is less than TminWhen, detailed process is as follows for sediment improvement:
If dregs is in shot shape, scatter mass structure or certain plasticity, improvement parameter estimate modification strategy is as follows: preferential to increase for clay
Big water injection rate obtains 10L dregs from belt conveyor, is mixed into the water of 1L every time, carries out slump examination to it after mixing evenly
It tests and judges dregs liquid-plastic state, when dregs state is not able to satisfy stream plasticity requirements, repeat the above steps, increase 2L's when having altogether
When water injection rate dregs stream plasticity is not able to satisfy stream plasticity requirements still, continue to be changed to increase 0.5L water and 1L foam every time when addition
Stirring；It is preferential to increase foam injection rate for sand, 10L dregs is obtained, 1L foam is mixed into every time and collapses after mixing evenly
Degree test, observe its flow plasticity whether meet the requirements, if the requirements are not met then repeats this step, when accumulation be mixed into 3L foam according to
When cannot so meet the requirements, continue to be changed to be mixed into 1L foam and 0.25L water every time when addition, until dregs stream plasticity satisfaction is wanted
It asks.
Further, for operating condition one:
If bleed phenomenon occurs in dregs, for sticky dregs, it is that current all pipeline water fillings are total that water injection rate, which reduces ratio,
The 10% of amount；For grittiness dregs, it is that current all pipelines fill the water the 10% of total amount that water injection rate, which reduces ratio, and foam injection rate increases
Adding ratio is the 5% of all pipeline foam total injections；
If the phenomenon that analysis foam occurs in dregs, for sticky dregs, foam injection rate reduces the bubble that ratio is all pipelines
The 10% of foam total injection；For grittiness dregs, foam injection rate reduces the foam total injection that ratio is all pipelines
5%, it is that all pipelines fill the water the 5% of total amount that water injection rate, which reduces ratio,.
Further, for operating condition two:
If dregs is in ideal plasticity state, no bleed, analysis frothing, for sticky dregs, foam injection rate reduces ratio
Example is the 10% of the currently foam total injection of all pipelines, and it is that current all pipelines fill the water total amount that water injection rate, which reduces ratio,
5%；For grittiness dregs, it is that current all pipelines fill the water the 10% of total amount that water injection rate, which reduces ratio, and foam injection rate reduces ratio
Example is the 5% of the currently foam total injection of all pipelines；
If bleed phenomenon occurs in dregs, for sticky dregs, it is that current all pipelines fill the water total amount that water injection rate, which reduces ratio,
10%, foam injection rate reduces the 5% of the foam total injection that ratio is current all pipelines；For grittiness dregs, water filling
Measuring reduction ratio is that current all pipelines fill the water the 10% of total amount；
If analysis frothing occurs in dregs, for sticky dregs, it is current all pipelines that foam injection rate, which reduces ratio,
The 10% of foam total injection；For grittiness dregs, it is total that foam injection rate reduces the foam injection that ratio is current all pipelines
Measuring setting value reduces by 10%, and it is that current all pipelines fill the water the 5% of total amount that water injection rate, which reduces ratio,.
Further, it before carrying out in place slump test, needs to check the quality of foam, in shield machine foam gun
End obtain foam after carry out frostproof froth n rate and half-life period test, if frostproof froth n rate 10 or more and half-life period 5min with
On, then foam quality is qualified；When frostproof froth n rate and half-life period wherein have one be unsatisfactory for requiring when, then priority check foam gun
Locate pressure sensor pressure, when blow pressure is lower than 0.35bar, then increase foaming system air operational pressure, when foaming is pressed
Power table shows and is tested again after operating pressure is greater than 0.35bar, increases bubble if foam quality cannot still be met the requirements
The setting value of foam agent concentration, increases 1% every time, until foam carries out dregs state verification after meeting the requirements again.
Further, when that can not be improved always using existing modifying agent or modifying agent injection is than being greater than 50%: right
In sticky dregs, consideration, which is shut down, to be changed as distributed foaming agent by foaming agent or dispersing agent progress laboratory test is separately configured, and is obtained
It is pushed away again after to corresponding improvement parameter；For arenaceous stratum, foam cannot be filled in soil particle hole, show as soil and foam point
From when, then consider to shut down modifying agent variation be subjected to laboratory test for injection mud and foam, obtain accordingly improveing after parameter again
It pushes away.
Compared with prior art, the beneficial effects of the present invention are:
(1) sediment improvement parameters revision scheme provided by the invention, because directlying adopt shield discharge dregs, relative to taking
Dregs without shield driving and improvement, this method are not necessarily to reconfigure dregs according to strata condition, and test period is short, this method
Use modifying agent to obtain in the ready-made improvement system of shield, test result is more accurate.
(2) present invention can tunnel in layer in shield machine, obtain dregs from belt conveyor in real time and carry out improved test
Tentative calculation obtains optimization improvement parameter, and in the case where formation condition variation, the dynamic adjustment that parameter can be improved for shield machine is mentioned
For theoretical foundation.
(3) improvement dregs of the present invention has gone through seepage effect in shield tunneling process, to this dregs
Improvement is optimized, can effectively consider that seepage action of ground water acts on the influence for dregs moisture content, and is directlyed adopt without shield
The undisturbed soil of cutting and improvement is improved, and does not consider influence of the seepage effect to dregs moisture content, the improvement optimization proposed
Scheme is more reasonable.
(4) the sediment improvement agent additive amount that the present invention obtains is the changing value in original improvement parameter, by simply counting
It just can be used for site operation after calculation, test and practice that convergence time is short, especially shield is tunneled in the fast stratum of formation variation
When, frequently, when determining improvement parameter using this kind of method, convenient and quick feature is especially prominent for the adjustment of sediment improvement parameter.
(5) the content of present invention is full and accurate, can in tunneling process in cohesive soil and arenaceous stratum for balancing earth-pressure shielding machine
The various dregs states that can occur are proposed corresponding evolutionary approach, effectively can provide technological guidance for engineering is practical.
Detailed description of the invention
Fig. 1 obtains flow chart to be of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Referring to Fig. 1, a kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state, for gravel
Sand class compound stratum carries out parameters revision, and its step are as follows:
(1) first the quality of foam is checked, carries out frostproof froth n rate after shield machine foam gun end obtains foam
Tested with half-life period, if frostproof froth n rate in 10 or more and half-life period in 5min or more, foam quality is qualified, works as frostproof froth n
Rate and half-life period one of them are unsatisfactory for requiring, then pressure sensor pressure at priority check foam gun, but blow pressure is lower than
When 0.35bar, then increase foaming system air operational pressure, after blow pressure table shows that operating pressure is greater than 0.35bar again
It is secondary to be tested, increase the setting value of foaming agent concentration if foam quality cannot still be met the requirements, increases 1% every time, directly
Dregs state verification is carried out after meeting the requirements to foam again.
(2) 10L dregs being obtained from belt conveyor and carrying out in place slump test, dregs stream is judged according to test result
Whether dynamic property meets the requirements.
(3) on the basis of mobility judges, in conjunction with its mecystasis of the apparent state evaluation of dregs, determine that dregs collapses
Angle value zone of reasonableness is [13,17] cm, then the stream mecystasis different for dregs, using corresponding modification method:
Operating condition one, when dregs slump value is between [13,17] cm, dregs mobility is suitable, but need according to dregs
Situations such as plasticity, bleed, analysis foam, carries out classification processing, and sediment improvement thinking is as follows:
Situations such as if sub- operating condition 1, dregs are in ideal plasticity, dregs is not loose, no bleed, analysis foam, without corrected dregs
Improve parameter.
If bleed phenomenon occur in sub- operating condition 2, dregs, improvement parameter estimate modification strategy is as follows: for grittiness dregs, infusing reducing
While water (ratio that reduces is that current all pipelines fill the water the 10% of total amount), increasing foam injection rate, (increasing ratio is institute
There is the 5% of pipeline foam total injection).
If the phenomenon that analysis foam occur in sub- operating condition 3, dregs, improvement parameter estimate modification strategy is as follows: for grittiness dregs, dropping
Reducing water injection rate while low foam injection rate (reduce the foam total injection that ratio is all pipelines 5%) (reduces ratio
Fill the water total amount for all pipelines 5%).
After above-mentioned sediment improvement correction strategy, obtains belt conveyor outlet dregs and carry out slump consistancy test, judgement
It flows mecystasis, as being unsatisfactory for, it is required that, then continued to take corresponding improvement correction measure according to the above correction strategy, until slag
Soil flow mecystasis is met the requirements.
Operating condition two, when dregs slump value be greater than 17cm when, show that dregs mobility is excessive, sediment improvement thinking is as follows:
If sub- operating condition 1, dregs are in ideal plasticity state, it is as follows to improve parameter estimate modification strategy for no bleed, analysis frothing:
For grittiness dregs, mainly reduces water injection rate (reduce ratio as current all pipelines and fill the water the 10% of total amounts) and appropriate reduce is steeped
Foam injection rate (reduces 5% that ratio is the currently foam total injection of all pipelines).
If bleed phenomenon occur in sub- operating condition 2, dregs, improvement parameter estimate modification strategy is as follows: main to reduce for grittiness dregs
Water injection rate (ratio that reduces is that current all pipelines fill the water the 10% of total amount).
If analysis frothing occur in sub- operating condition 3, dregs, improvement parameter estimate modification strategy is as follows: main to drop for grittiness dregs
Low foam injection rate (the foam total injection setting value for reducing ratio as current all pipelines reduces by 10%) and appropriate reduce are infused
Water (ratio that reduces is that current all pipelines fill the water the 5% of total amount).
After above-mentioned sediment improvement correction strategy, obtains live belt conveyor outlet dregs and carries out slump consistancy test,
Judge that it flows mecystasis, as being unsatisfactory for, it is required that, then continued to take corresponding ameliorative measure according to the above correction strategy, until slag
Soil flow mecystasis is met the requirements.
Operating condition three, when dregs slump value be less than 13cm, show that dregs illiquidity, sediment improvement thinking are as follows:
If dregs is in shot shape, scatter mass structure, improvement parameter estimate modification strategy is as follows: preferential to increase foam note for sandy soil
Enter amount, obtain 10L dregs, be mixed into 1L foam every time and carry out slump consistancy test after mixing evenly, observes it and flow whether plasticity meets
This step is then repeated it is required that if the requirements are not met, when accumulation, which is mixed into 3L foam, cannot still meet the requirements, when continuing addition
It is changed to be mixed into 1L foam and 0.25L water every time, until dregs stream plasticity is met the requirements.
For the dregs slump be less than 13cm operating condition, by the water injection rate of improved test, foam inject ratio, frothing percentage,
Driving speed carrys out the sediment improvement parameter after inverse is optimized.Steps are as follows for calculating:
A. proving ring is calculated to be averaged driving speed:
In formula, L is shield duct piece width, and t is the time for tunneling the ring.
B. the injection variable quantity of water is calculated:
In formula, △ VWaterThe water filling volume for needing to increase when to tunnel per minute, VWaterThe injected slurry volume of water, A are when to test
Shield machine excavation area, K are the coefficient of volumetric expansion.
C. the injection variable quantity of foam is calculated:
In formula, △ VfThe foam volume for needing to increase when to tunnel per minute, VfThe injected slurry volume of foam when to test.
D. parameter setting
1. the setting of water
If shield soil has water jet in storehouse, the increment relations of distribution of water are accounted for into 70%, Tu Cang water spray for cutterhead water spray and are accounted for
30%；
2. the setting of foam
If there is applicator in shield soil storehouse, the increment relations of distribution of foam are that the storehouse Tu Cang accounts for 30%, and cutter head foam accounts for
70%, wherein spout accounts for 40% at center, other spouts account for 30%；If there is no applicator, foam increment in shield soil storehouse
The cutter head center spout that is assigned as account for 50%, other spouts account for 50%.
(4) when using existing modifying agent can not improve always or modifying agent injection than it is excessive (foam injection ratio be greater than
50%): for arenaceous stratum, probably due to coarse granule content is more, foam cannot be filled in soil particle hole, show as soil
When with foam fraction factor, then considering to shut down by modifying agent variation is injection mud and foam progress laboratory test, is accordingly improved
It is pushed away again after parameter.
Embodiment 2
A kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state, for cohesive soil stratum
Parameters revision is carried out, steps are as follows for sediment improvement:
(1) quality of foam is checked, shield machine foam gun end obtain foam after carry out frostproof froth n rate and
Half-life period test, if frostproof froth n rate is in 10 or more and half-life period in 5min or more, foam quality qualification, when frostproof froth n rate
It is unsatisfactory for requiring with half-life period one of them, then pressure sensor pressure at priority check foam gun, but blow pressure is lower than
When 0.35bar, then increase foaming system air operational pressure, after blow pressure table shows that operating pressure is greater than 0.35bar again
It is secondary to be tested, increase the setting value of foaming agent concentration if foam quality cannot still be met the requirements, increases 1% every time, directly
Dregs state verification is carried out after meeting the requirements to foam again.
(2) 10L dregs being obtained from belt conveyor and carrying out in place slump test, dregs stream is judged according to test result
Whether dynamic property meets the requirements.
(3) on the basis of mobility judges, in conjunction with its mecystasis of the apparent state evaluation of dregs, determine that dregs collapses
Angle value zone of reasonableness is [15,20] cm, then the stream mecystasis different for dregs, using corresponding modification method:
Operating condition one, when dregs slump value is between [15,20] cm, dregs mobility is suitable, but need according to dregs
Situations such as plasticity, bleed, analysis foam, carries out classification processing, and sediment improvement thinking is as follows:
Situations such as if sub- operating condition 1, dregs are in ideal plasticity, dregs is not loose, no bleed, analysis foam, without corrected dregs
Improve parameter.
If bleed phenomenon occur in sub- operating condition 2, dregs, improvement parameter estimate modification strategy is as follows: main to reduce for sticky dregs
Water injection rate (ratio that reduces is that current all pipelines fill the water the 10% of total amount)；
If the phenomenon that analysis foam occur in sub- operating condition 3, dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, mainly
Reduce foam injection rate (reduce the foam total injection that ratio is all pipelines 10%)；
After above-mentioned sediment improvement correction strategy, obtains belt conveyor outlet dregs and carry out slump consistancy test, judgement
It flows mecystasis, as being unsatisfactory for, it is required that, then continued to take corresponding improvement correction measure according to the above correction strategy, until slag
Soil flow mecystasis is met the requirements.
Operating condition two, when dregs slump value be greater than 20cm when, show that dregs mobility is excessive, sediment improvement thinking is as follows:
If sub- operating condition 1, dregs are in ideal plasticity state, it is as follows to improve parameter estimate modification strategy for no bleed, analysis frothing:
For sticky dregs, at the same reduce foam injection rate (reduce the foam total injection that ratio is current all pipelines 10%) with
Water injection rate (ratio that reduces is that current all pipelines fill the water the 5% of total amount)；
If bleed phenomenon occur in sub- operating condition 2, dregs, improvement parameter estimate modification strategy is as follows: main to reduce for sticky dregs
(ratio that reduces is current all pipes for water injection rate (ratio that reduces is that current all pipelines fill the water the 10% of total amount) and foam injection rate
The 5% of the foam total injection on road)；
If analysis frothing occur in sub- operating condition 3, dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing bubble
Foam injection rate (reduces 10% that ratio is the currently foam total injection of all pipelines)；
After above-mentioned sediment improvement correction strategy, obtains live belt conveyor outlet dregs and carries out slump consistancy test,
Judge that it flows mecystasis, as being unsatisfactory for, it is required that, then continued to take corresponding ameliorative measure according to the above correction strategy, until slag
Soil flow mecystasis is met the requirements.
Operating condition three, when dregs slump value be less than 15cm, show that dregs illiquidity, sediment improvement thinking are as follows:
If dregs is in certain plasticity, improvement parameter estimate modification strategy is as follows: for clay, preferentially increasing water injection rate, from belt
10L dregs is obtained in conveyer, is mixed into the water of 1L every time, is carried out slump consistancy test to it after mixing evenly and is judged that dregs stream moulds shape
State repeats the above steps when dregs state is not able to satisfy stream plasticity requirements, when the water injection rate dregs stream plasticity for increasing 2L altogether
When not being able to satisfy stream plasticity requirements still, continue to be changed to increase every time 0.5L water and the stirring of 1L foam when addition, until dregs stream
Plasticity is met the requirements.
For the dregs slump be less than 15cm operating condition, by the water injection rate of improved test, foam inject ratio, frothing percentage,
Driving speed carrys out the sediment improvement parameter after inverse is optimized.Steps are as follows for calculating:
B. proving ring is calculated to be averaged driving speed:
In formula, L is shield duct piece width, and t is the time for tunneling the ring.
B. the injection variable quantity of water is calculated:
In formula, △ VWaterThe water filling volume for needing to increase when to tunnel per minute, VWaterThe injected slurry volume of water, A are when to test
Shield machine excavation area, K are the coefficient of volumetric expansion.
C. the injection variable quantity of foam is calculated:
In formula, △ VfThe foam volume for needing to increase when to tunnel per minute, VfThe injected slurry volume of foam when to test.
D. parameter setting
1. the setting of water
If shield soil has water jet in storehouse, the increment relations of distribution of water are accounted for into 70%, Tu Cang water spray for cutterhead water spray and are accounted for
30%；
2. the setting of foam
If there is applicator in shield soil storehouse, the increment relations of distribution of foam are that the storehouse Tu Cang accounts for 30%, and cutter head foam accounts for
70%, wherein spout accounts for 40% at center, other spouts account for 30%；If there is no applicator, foam increment in shield soil storehouse
The cutter head center spout that is assigned as account for 50%, other spouts account for 50%.
(4) when using existing modifying agent can not improve always or modifying agent injection than it is excessive (foam injection ratio be greater than
50%): for arenaceous stratum, probably due to coarse granule content is more, foam cannot be filled in soil particle hole, show as soil
When with foam fraction factor, then considering to shut down by modifying agent variation is injection mud and foam progress laboratory test, is accordingly improved
It is pushed away again after parameter.
The dregs that the present invention is obtained from belt conveyor evaluates its mobility state by slump consistancy test, in conjunction with slag
Its mecystasis of the apparent state evaluation of soil determines that the zone of reasonableness of slump value is [Tmin, Tmax], it is then different for dregs
Stream mecystasis, using corresponding modification method.
When dregs mobility is excessive, bleed occurs, analysis frothing when, for different dregs type using reducing shield
The mode of ameliorating of machine water injection rate and foam injection rate parameter value.
When dregs mobility is poor, obtains dregs and add a certain amount of foam and the secondary improvement of water progress, until slag
Earthy state meets the requirements.Additional water injection rate, foam additive amount needed for calculating to improve every liter of dregs according to test result etc., according to
The sediment improvement parameter of initial setting finds out the modifying agent initial content of every liter of dregs, instead releases in conjunction with the two and is suitable for the stratum
Sediment improvement parameter.According to water when the initial boring parameter of shield machine and secondary improvement and the additive amount of foam, using corresponding
Revised sediment improvement parameter value is calculated in formula.
The method considers influence of the seepage effect to dregs moisture content in shield machine tunneling process, and can be in tunneling process
In with formation condition variation to improvement parameter dynamic adjustment provide foundation, make improve parameter setting it is more reasonable, enable slag
Soil keeps ideal Plastic Flow state.
Above-described embodiment is only to clearly demonstrate examples made by the present invention, rather than the restriction to embodiment.For
For those of ordinary skill in the art, other various forms of variations or change can also be made on the basis of the above description
It is dynamic.Here without can not be also exhaustive to all embodiments.And the obvious variation or change thus amplified out
It is dynamic to be still in the protection scope of this invention.
Claims (8)
1. a kind of earth pressure balanced shield, EPBS sediment improvement parameter correction method based on live dregs state, it is characterised in that: with shield
The dregs and the modifying agent that uses of scene of structure machine discharge are sediment improvement test material, carry out in place slump test, according to collapsing
Degree of falling test and the apparent state evaluation of dregs its flow mecystasis；If dregs was improvement state, according to for different slags
Great soil group type is improved by the way of adjustment shield machine water injection rate and foam injection rate parameter value；If dregs is to owe improvement shape
State obtains dregs and adds a certain amount of foam and the secondary improvement of water progress, until dregs state meets the requirements, according to shield machine
Initial boring parameter and the additive amount of water and foam when secondary improvement, revised sediment improvement parameter value is calculated.
2. modification method according to claim 1, which is characterized in that the detailed process of sediment improvement parameters revision are as follows: from
Dregs is obtained on belt conveyor and carries out in place slump test, is judged whether dregs mobility meets according to test result and is wanted
It asks, on the basis of mobility judges, in conjunction with its mecystasis of the apparent state evaluation of dregs, determines that dregs slump value is reasonable
Range [Tmin, Tmax], it is then directed to the different stream mecystasis of dregs, using corresponding ameliorative measure:
Operating condition one: when dregs slump value is in [Tmin, Tmax] between, dregs mobility is suitable, but need according to dregs plasticity,
Bleed, analysis foam situation carry out classification processing, and sediment improvement thinking is as follows:
If dregs is in ideal plasticity, dregs is not loose, no bleed, analysis foam situation, without correcting sediment improvement parameter；
If bleed phenomenon occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing water injection rate；For grittiness
Dregs increases foam injection rate while reducing water injection rate；
If the phenomenon that analysis foam occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing foam injection rate；
For grittiness dregs, while reducing foam injection rate, water injection rate is reduced；
After above-mentioned sediment improvement correction strategy, belt conveyor outlet dregs is taken to carry out slump consistancy test, judges its stream modeling
Character state such as is still unsatisfactory for requiring, then continues to improve according to the above correction strategy, until dregs stream mecystasis satisfaction is wanted
Until asking；
Operating condition two: when dregs slump value is greater than TmaxWhen, show that dregs mobility is excessive, sediment improvement thinking is as follows:
If dregs is in ideal plasticity state, no bleed, analysis frothing, improvement parameter estimate modification strategy is as follows: for sticky dregs,
Foam injection rate and water injection rate are reduced simultaneously；For grittiness dregs, water injection rate and appropriate reduction foam injection rate are reduced；
If bleed phenomenon occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing water injection rate and foam injection
Amount；For grittiness dregs, water injection rate is reduced；
If analysis frothing occurs in dregs, improvement parameter estimate modification strategy is as follows: for sticky dregs, reducing foam injection rate；It is right
In grittiness dregs, reduces foam injection rate and suitably reduce water injection rate；
After above-mentioned sediment improvement correction strategy, enchashment field belt conveyor exports dregs and carries out slump consistancy test, judges it
Mecystasis is flowed, such as is still unsatisfactory for requiring, then continues to improve according to the above correction strategy, until dregs stream mecystasis is full
Until foot requires；
Operating condition three: when dregs slump value is less than TminWhen, show dregs illiquidity, by increasing water injection rate and/or foam
Injection rate improves dregs, until dregs stream plasticity is met the requirements；It is injected by the water injection rate of improved test, foam
Carry out the sediment improvement parameter after inverse is optimized than, driving speed, calculate that steps are as follows:
Step 1: it calculates proving ring and is averaged driving speed:
In formula, L is shield duct piece width, and t is the time for tunneling the ring；
Step 2: calculate the injection variable quantity of water:
In formula, △ VWaterThe water filling volume for needing to increase when to tunnel per minute, VWaterThe injected slurry volume of water when to test, A is shield
Machine excavation area, K are the coefficient of volumetric expansion；
Step 3: calculate the injection variable quantity of foam:
In formula, △ VfThe foam volume for needing to increase when to tunnel per minute, VfThe injected slurry volume of foam when to test.
3. modification method according to claim 2, it is characterised in that: further include the steps that parameter setting after step 3:
1. the setting of water
If shield soil has water jet in storehouse, the increment relations of distribution of water are accounted for into 70%, Tu Cang water spray for cutterhead water spray and account for 30%；
2. the setting of foam
If there is applicator in shield soil storehouse, the increment relations of distribution of foam are that the storehouse Tu Cang accounts for 30%, and cutter head foam accounts for 70%,
Spout accounts for 40% at center, other spouts account for 30%；If not having applicator in shield soil storehouse, foam increment is assigned as
Cutter head center spout accounts for 50%, other spouts account for 50%.
4. modification method according to claim 2 or 3, it is characterised in that: when dregs slump value is less than TminWhen, dregs
Detailed process is as follows for improvement:
If dregs is in shot shape, scatter mass structure or certain plasticity, improvement parameter estimate modification strategy is as follows: preferential to increase note for clay
Water obtains 10L dregs from belt conveyor, is mixed into the water of 1L every time, carries out slump consistancy test to it after mixing evenly and sentence
Disconnected dregs liquid-plastic state repeats the above steps when dregs state is not able to satisfy stream plasticity requirements, when the water filling for increasing 2L altogether
When amount dregs stream plasticity is not able to satisfy stream plasticity requirements still, continues to be changed to increase 0.5L water every time when addition and 1L foam stirs
It mixes；It is preferential to increase foam injection rate for sand, 10L dregs is obtained, 1L foam is mixed into every time and carries out the slump after mixing evenly
Test observes it and flows whether plasticity meets the requirements, and if the requirements are not met then repeats this step, when accumulation is mixed into 3L foam still
When cannot meet the requirements, continue to be changed to be mixed into 1L foam and 0.25L water every time when addition, until dregs stream plasticity is met the requirements.
5. modification method according to claim 2 or 3, which is characterized in that be directed to operating condition one:
If bleed phenomenon occurs in dregs, for sticky dregs, it is that current all pipelines fill the water total amount that water injection rate, which reduces ratio,
10%；For grittiness dregs, it is that current all pipelines fill the water the 10% of total amount that water injection rate, which reduces ratio, and foam injection rate increases ratio
Example is the 5% of all pipeline foam total injections；
If the phenomenon that analysis foam occurs in dregs, for sticky dregs, foam injection rate reduces the foam that ratio is all pipelines and infuses
Enter the 10% of total amount；For grittiness dregs, foam injection rate reduces the 5% of the foam total injection that ratio is all pipelines, note
It is that all pipelines fill the water the 5% of total amount that water, which reduces ratio,.
6. modification method according to claim 2 or 3, which is characterized in that be directed to operating condition two:
If dregs is in ideal plasticity state, no bleed, analysis frothing, for sticky dregs, foam injection rate reduces ratio and is
The 10% of the foam total injection of current all pipelines, it is that current all pipelines fill the water the 5% of total amount that water injection rate, which reduces ratio,；It is right
In grittiness dregs, it is that current all pipelines fill the water the 10% of total amount that water injection rate, which reduces ratio, and it is to work as that foam injection rate, which reduces ratio,
The 5% of the foam total injection of preceding all pipelines；
If bleed phenomenon occurs in dregs, for sticky dregs, it is that current all pipelines fill the water total amount that water injection rate, which reduces ratio,
10%, foam injection rate reduces the 5% of the foam total injection that ratio is current all pipelines；For grittiness dregs, water injection rate
Reduction ratio is that current all pipelines fill the water the 10% of total amount；
If analysis frothing occurs in dregs, for sticky dregs, foam injection rate reduces the foam that ratio is current all pipelines
The 10% of total injection；For grittiness dregs, foam injection rate reduces the foam total injection that ratio is current all pipelines and sets
Setting value reduces by 10%, and it is that current all pipelines fill the water the 5% of total amount that water injection rate, which reduces ratio,.
7. modification method according to claim 2 or 3, it is characterised in that: before carrying out in place slump test, need to bubble
The quality of foam is checked, and frostproof froth n rate and half-life period test is carried out after shield machine foam gun end obtains foam, if bubble
Foam frothing percentage is in 10 or more and half-life period in 5min or more, then foam quality is qualified；Wherein have when frostproof froth n rate and half-life period
One when being unsatisfactory for requiring, then pressure sensor pressure at priority check foam gun, when blow pressure is lower than 0.35bar, then
Increase foaming system air operational pressure, is tested again after blow pressure table shows that operating pressure is greater than 0.35bar, if
Foam quality cannot still be met the requirements, and increased the setting value of foaming agent concentration, increased 1% every time, until foam is met the requirements
Carry out dregs state verification again afterwards.
8. modification method according to claim 2 or 3, it is characterised in that: can not change always when using existing modifying agent
When the injection of good or modifying agent is than being greater than 50%: for sticky dregs, considering to shut down by foaming agent variation is distributed foaming agent
Or dispersing agent is separately configured and carries out laboratory test, it obtains pushing away again after accordingly improveing parameter；For arenaceous stratum, foam cannot be filled
In soil particle hole, show as soil and when foam fraction factor, then consider to shut down by modifying agent variation for injection mud and foam into
Row laboratory test obtains pushing away again after accordingly improveing parameter.
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| CN110552705A (en) * | 2019-05-27 | 2019-12-10 | 中铁十八局集团第四工程有限公司 | Automatic improvement method for residual soil during tunneling of earth pressure balance shield tunnel |
| CN110566211A (en) * | 2019-09-04 | 2019-12-13 | 中交一公局第三工程有限公司 | Earth pressure shield muck flow plasticity improvement method suitable for sandy gravel stratum |
| CN110705015A (en) * | 2019-08-26 | 2020-01-17 | 中南大学 | Foam improved soil permeability prediction method based on interaction of foam and soil particles |
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| CN110705015B (en) * | 2019-08-26 | 2022-04-22 | 中南大学 | Foam improved soil permeability prediction method based on interaction of foam and soil particles |
| CN110705015A (en) * | 2019-08-26 | 2020-01-17 | 中南大学 | Foam improved soil permeability prediction method based on interaction of foam and soil particles |
| CN110566211A (en) * | 2019-09-04 | 2019-12-13 | 中交一公局第三工程有限公司 | Earth pressure shield muck flow plasticity improvement method suitable for sandy gravel stratum |
| CN110566211B (en) * | 2019-09-04 | 2020-11-24 | 中交一公局第三工程有限公司 | Earth pressure shield muck flow plasticity improvement method suitable for sandy gravel stratum |
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