CN113653496B - Method for stabilizing whole process of slurry shield tunneling - Google Patents

Method for stabilizing whole process of slurry shield tunneling Download PDF

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CN113653496B
CN113653496B CN202110950250.1A CN202110950250A CN113653496B CN 113653496 B CN113653496 B CN 113653496B CN 202110950250 A CN202110950250 A CN 202110950250A CN 113653496 B CN113653496 B CN 113653496B
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slurry
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张子新
谷冠思
黄昕
金国龙
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Tongji University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • E21D9/093Control of the driving shield, e.g. of the hydraulic advancing cylinders
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/20Hydro energy

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  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

The invention provides a mudThe method for stabilizing the whole process of water shield tunneling obtains the density rho of input slurry in the slurry shield tunneling process through monitoringinDensity rho of slurry mixed with soil after excavationoutFlow rate q of sludgeinDischarge flow q of sludgeoutAnd cutting surface water pressure psAnd (3) the parameters are equal, and the parameter lambda (t) of the surrounding rock deformation related to the time is obtained through a calculation method or a numerical method according to the formation characteristics. Defining and calculating the escaping mud flow speed q at each moment in the slurry shield tunneling processs1(i.e. the mud flow rate lost by retention in the earth surrounding the tunnel), the mud escaping flow rate q through successive points in times1And the density of discharged slurry (namely the density rho of the slurry mixed with the soil slag)out) And performing comparison and judgment, determining the safety state of the excavation surface at the moment, adjusting excavation parameters in real time, realizing a real-time supporting strategy of slurry shield tunnel excavation, and guiding slurry shield tunnel excavation safety construction.

Description

Method for stabilizing whole process of slurry shield tunneling
Technical Field
The invention relates to the field of slurry shield tunnel excavation.
Background
The traditional shield tunneling control method adjusts the tunneling strategy (comprising tunneling speed, cutter head rotating speed, supporting pressure and the like) in due time by depending on ground deformation indexes. However, the method has certain hysteresis, the condition of excavation face collapse or seepage channel formation and the like cannot be predicted, and the method is not suitable for a deep-buried shield tunnel particularly because deformation cannot develop to the ground surface. In addition, even for a shield tunnel buried shallowly, when significant displacement is measurable on the earth surface, usually little deformation occurs near the excavation face, and there is significant hysteresis, so the conventional method is exactly a 'sheep-out-of-reinforcement' type control technology. In recent years, tunnel engineering has gradually progressed to deeper strata and more complex geological environments, and there is a state in which "the ground surface does not have large deformation, but the excavation surface is close to instability". The method is not solved by the traditional shield tunnel mining state control method. Meanwhile, the control requirement of future underground engineering construction on stratum disturbance is stricter, and the state of reducing stratum deformation to the maximum extent and even 'zero deformation' is achieved. Therefore, a real-time and pre-emergence-preventive tunneling control method is urgently needed in shield tunnel engineering to meet the increasing safety requirements of underground space development.
Aiming at the problems, no effective solution and technical scheme are provided at home and abroad at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and discloses a method for stabilizing the whole process of slurry shield tunneling, which is used for establishing the relation between slurry feeding and discharging quantity and tunneling speed of a slurry shield based on the idea of conservation of quality and effectively providing the important strategy change of the shield tunneling at the next moment through the real-time accurate measurement of excavated soil quantity and density: and adjusting the tunneling speed, the muddy water supporting pressure and the like in real time.
In order to realize the purpose of the invention, the technical scheme is as follows:
a method for stabilizing the whole process of slurry shield tunneling is characterized in that the density rho of input slurry in the slurry shield tunneling process is obtained through monitoringinDensity rho of slurry mixed with soil after excavationoutFlow rate q of sludgeinDischarge flow q of sludgeoutAnd cutting surface water pressure psAnd (3) isoparametric obtaining a parameter lambda (t) of the surrounding rock deformation and the time correlation through a calculation method according to the stratum characteristics. Defining and calculating the escaping mud flow speed q at each moment in the slurry shield tunneling processs1(i.e. the mud flow rate lost by retention in the earth surrounding the tunnel), the mud escaping flow rate q through successive points in times1And the density of discharged slurry (namely the density rho of the slurry mixed with the soil slag)out) And performing comparison and judgment, determining the safety state of the excavation surface at the moment, adjusting excavation parameters in real time, realizing a real-time supporting strategy of slurry shield tunnel excavation, and guiding slurry shield tunnel excavation safety construction.
The method comprises the following specific steps:
s1, obtaining the density rho of the clear slurry in the slurry shield tunneling process through real-time monitoringinDensity rho of slurry doped with soil slagoutFlow rate q of sludgeinDischarge flow q of sludgeoutShield propulsion speed vfw
S2, according to the mass conservation relation, the sand content relation of the slurry shield system in and out soil is determined by a first formula:
the formula I is as follows: s. thef-out=Sm-out-(Sm-in-Sm-loss of)-SLoosening of the screw
Wherein S isf-outThe dry sand content in the original place space occupied by the shield propulsion is calculated by a formula II:
the formula II is as follows:
Figure BDA0003218157950000021
wherein, gamma'soilThe effective gravity of the soil body of the excavation surface, w is the water content of the soil body of the excavation surface, d is the outer diameter of the shield, G is the acceleration of gravity, GsIs the specific gravity of the soil grains;
Sm-outthe actual sand production amount obtained according to the monitoring data is calculated by a formula III:
the formula III is as follows:
Figure BDA0003218157950000031
where ρ iswIs the density of water;
Sm-inthe actual sand feeding amount obtained according to the monitoring data is calculated by a formula IV:
the formula four is as follows:
Figure BDA0003218157950000032
Sm-lossThe amount of dry sand lost to slurry dissipation into the surrounding formation is calculated by equation five:
the formula five is as follows:
Figure BDA0003218157950000033
wherein q iss1The mud escaping flow rate is set;
Sloosening of the screwThe amount of dry sand caused by the loosening of the surrounding soil body due to tunneling disturbance is calculated by a formula six:
formula six:
Figure BDA0003218157950000034
wherein λ' (t) is a parameter related to the residence time t and the rock-soil mass properties; the residence time t represents the time taken for the soil body to be excavated after being disturbed, vfwThe shield propulsion speed, t is the residence time, t0For the retention time of the soil mass at a distance, t1The retention time of the soil body on the excavation surface is calculated;
s3, adopting formula seven to predict the time t required by the cutter head to reach the specified sectionp
The formula seven:
Figure BDA0003218157950000035
wherein x ispFor a given distance between the section and the excavation face,
Figure BDA0003218157950000036
the average shield tunneling speed is a period of time;
s4, substituting the formula II to the formula seven into the formula I to obtain the formula eight:
the formula eight:
Figure BDA0003218157950000041
calculating the mud escaping flow rate q at the current moment according to the formula eights1,qs1The formula nine is used to obtain:
the formula is nine:
Figure BDA0003218157950000042
s5, when the stratum is stable and the tunneling is normal, taking the calculated value of the mud escaping flow rate at the previous moment as the predicted value of the mud escaping flow rate at the next moment; comparing the predicted value and the measured value of the mud escaping flow speed at the current moment, and judging the mud escaping state; when the measured value is greater than the predicted value, the loss rate of the slurry is high, the possibility of mud film damage is increased, the slurry feeding density is improved, and the support pressure is reduced; when the measured value is smaller than the predicted value, reducing the slurry feeding density, and maintaining or accelerating the shield tunneling speed;
s6, monitoring the slurry discharge density in real time, taking the measured value of the slurry discharge density at the previous moment as the predicted value of the slurry discharge density at the next moment when the stratum is stable and the tunneling is normal; estimating the pulp discharge density at the next moment according to the calculated value of the pulp discharge density at the previous moment, and comparing the predicted value and the calculated value of the pulp discharge density at the current moment to judge whether the risk of potential collapse exists; when the measured value is larger than the predicted value, the excavation surface is likely to have local collapse, the propulsion is stopped, the slurry cabin is desilted, and the supporting pressure is improved until the balance is reestablished; and when the measured value is smaller than the predicted value, continuing to advance.
Wherein, the steps S5 and S6 are performed synchronously.
The principle of the method is as follows: the method is a muddy water shield tunnel whole-process stabilizing method based on real-time monitoring and calculation feedback, establishes the relation between 'slurry feeding and discharging amount-tunneling speed' of the muddy water shield based on the idea of conservation of quality, and effectively provides the important strategy change of shield tunneling at the next moment through the real-time accurate measurement of excavated soil amount and density: and adjusting the tunneling speed, the muddy water supporting pressure and the like in real time.
In future application, the method mainly faces to the technical and management personnel of shield tunnel field construction units, can be used for accurately knowing the stable state of the excavation face, guiding the shield to adjust the tunneling strategy in time, forming and storing data files, and can also be used for data accumulation and dynamic feedback design and construction.
Has the advantages that:
1. the method has a certain prediction effect on the instability possibly occurring on the excavation surface, and can adjust the excavation strategy more timely according to the measured values.
2. The method does not need to be regulated and controlled according to ground deformation monitoring data feedback, and the change condition of the excavation surface of the deep-buried tunnel is easier to perceive.
Drawings
FIG. 1 is a tunneling strategy control flow chart of the present invention
FIG. 2 is a schematic view of residence time
FIG. 3 is a schematic view of a scene of an intelligent control system of a slurry shield
1-a cutter head; 2-a water and soil pressure sensor; 3-a mud film; 4-a muddy water cabin; 5-a pulp inlet pipe; 6-a slurry discharge pipe; 7-1-flow sensor one (slurry inlet); 7-2-flow sensor two (slurry discharge); 8-1-densimeter one (slurry inlet); 8-2-densimeter II (discharging pulp)
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
An example of the application is shown in fig. 1 and 2:
s1, obtaining the density rho of the clear slurry in the slurry shield tunneling process through real-time monitoringinDensity rho of slurry doped with soil slagoutFlow rate q of sludgeinDischarge flow q of sludgeoutShield propulsion speed vfw
S2, according to the mass conservation relation, the sand content relation of the slurry shield system in and out soil can be determined by a first formula:
the formula I is as follows: sf-out=Sm-out-(Sm-in-Sm-loss of)-SLoosening of the screw
Wherein S isf-outThe dry sand content in the original place space occupied by the shield propulsion can be calculated by a formula II:
the formula II is as follows:
Figure BDA0003218157950000061
wherein, gamma'soilThe effective gravity of the soil body of the excavation surface, w is the water content of the soil body of the excavation surface, d is the outer diameter of the shield, G is the acceleration of gravity, GsIs the specific gravity of the soil grains;
Sm-outthe actual sand production amount obtained according to the monitoring data can be calculated by a formula III:
the formula III is as follows:
Figure BDA0003218157950000062
where ρ iswIs the density of water;
Sm-inthe actual sand feeding amount obtained according to the monitoring data can be calculated by a formula four:
the formula four is as follows:
Figure BDA0003218157950000063
Sm-loss ofThe amount of dry sand lost to slurry dissipation into the surrounding formation can be calculated from equation five:
the formula five is as follows:
Figure BDA0003218157950000064
wherein q iss1The mud escaping flow rate is set;
Sloosening of the screwThe amount of dry sand caused by the loosening of the surrounding soil body due to tunneling disturbance can be calculated by a formula six:
formula six:
Figure BDA0003218157950000065
wherein, λ' (t) is a parameter related to the retention time t and the properties of the rock-soil mass, and the value can be obtained by a numerical simulation method through a conventional software tool in scientific research or determined by the conventional theoretical calculation; the retention time t represents the time taken from disturbance of the soil body to excavation, as shown in fig. 2: v. offwThe shield propulsion speed, t is the residence time, t0For the retention time of the soil mass at a distance, t1The retention time of the soil body on the excavation surface is determined.
S3, adopting formula seven to predict the time t required by the cutter head to reach the specified sectionp
The formula seven:
Figure BDA0003218157950000071
wherein x ispFor a given distance between the section and the excavation face,
Figure BDA0003218157950000072
is aAnd the average shield tunneling speed in a period of time.
S4, substituting the formula II to the formula seven into the formula I to obtain the formula eight:
the formula eight:
Figure BDA0003218157950000073
calculating the mud escaping flow rate q at the current moment according to the formula eights1,qs1The following formula can be obtained:
the formula is nine:
Figure BDA0003218157950000074
and S5, when the stratum is stable and the tunneling is normal, taking the calculated value of the mud escaping flow rate at the previous moment as the predicted value of the mud escaping flow rate at the next moment. And comparing the predicted value and the measured value of the mud escaping flow speed at the current moment, and judging the mud escaping state. When the measured value is greater than the predicted value, the loss rate of the slurry is high, the possibility of mud film damage is increased, the slurry feeding density is properly increased, and the support pressure is reduced; when the measured value is smaller than the predicted value, the slurry feeding density is properly reduced, and the shield tunneling speed is maintained or accelerated.
And S6, monitoring the slurry discharge density in real time, and taking the measured value of the slurry discharge density at the previous moment as the predicted value of the slurry discharge density at the next moment when the stratum is stable and the tunneling is normal. And estimating the pulp discharge density at the next moment according to the calculated value of the pulp discharge density at the previous moment, and comparing the predicted value and the calculated value of the pulp discharge density at the current moment to judge whether the risk of potential collapse exists. When the measured value is larger than the predicted value, local collapse of the excavation surface is possible, soil falls into a muddy water cabin to cause increase of muddy water density, propulsion can be stopped, the muddy water cabin is desilted, and the supporting pressure is properly increased until balance is reestablished; and when the measured value is smaller than the predicted value, the propulsion can be continued.
And the steps S5 and S6 are synchronously performed, belong to a parallel relation and jointly provide a corresponding strategy for shield tunneling.
In the tunneling process of the shield tunneling machine, important construction information is collected, corresponding adjustment measures can be obtained after the shield tunneling machine is processed according to the technical scheme, and the adjustment measures can be fed back to shield tunneling operators in time.

Claims (1)

1. A method for stabilizing the whole process of slurry shield tunneling is characterized in that the density rho of input slurry in the slurry shield tunneling process is obtained through monitoringinAnd the density rho of the slurry mixed with the soil slag after excavationoutFlow rate q of sludgeinDischarge flow q of sludgeoutAnd cutting surface water pressure psObtaining a parameter lambda (t) of the surrounding rock deformation and time correlation through a calculation method according to the stratum characteristics; defining and calculating the escaping mud flow speed q at each moment in the slurry shield tunneling processs1Passing through the mud escaping flow rate q at the front and rear adjacent momentss1Comparing and judging the slurry discharge density, determining the safety state of the excavation surface at the moment, adjusting the excavation parameters in real time, realizing a real-time supporting strategy of slurry shield tunnel excavation, and guiding slurry shield tunnel excavation safety construction; the slurry discharge density is the density rho of the slurry mixed with the soil slagout
The method comprises the following specific steps:
s1, acquiring the density rho of input slurry in the slurry shield tunneling process through real-time monitoringinDensity rho of slurry doped with soil slagoutFlow rate q of sludgeinDischarge flow q of sludgeoutShield propulsion speed vfw
S2, according to the mass conservation relation, the sand content relation of the slurry shield system in and out soil is determined by a first formula:
the formula I is as follows: sf-out=Sm-out-(Sm-in-Sm-loss of)-SLoosening of the screw
Wherein S isf-outThe dry sand content in the original place space occupied by the shield propulsion is calculated by a formula II:
the formula II is as follows:
Figure FDA0003554278840000011
wherein, gamma'soilThe effective gravity of the soil body of the excavation surface, w is the water content of the soil body of the excavation surface, d is the outer diameter of the shield, G is the acceleration of gravity, GsIs the specific gravity of the soil grains;
Sm-outthe actual sand production amount obtained according to the monitoring data is calculated by a formula III:
the formula III is as follows:
Figure FDA0003554278840000012
where ρ iswIs the density of water;
Sm-inthe actual sand feeding amount obtained according to the monitoring data is calculated by a formula IV:
the formula four is as follows:
Figure FDA0003554278840000013
Sm-loss ofThe amount of dry sand lost to slurry dissipation into the surrounding formation is calculated by equation five:
the formula is five:
Figure FDA0003554278840000021
wherein q iss1The mud escaping flow rate is set;
Sloosening of the screwThe amount of dry sand caused by the loosening of the surrounding soil body due to tunneling disturbance is calculated by a formula six:
the formula six:
Figure FDA0003554278840000022
wherein λ' (t) is a parameter related to the residence time t and the rock-soil mass properties; the residence time t represents the time taken for the soil body to be excavated after being disturbed, vfwThe shield advancing speed is set;
s3, estimating the time t required by the cutter head to reach the designated section by adopting a formula sevenp
The formula seven:
Figure FDA0003554278840000023
wherein x ispFor a given distance between the section and the excavation face,
Figure FDA0003554278840000024
the average shield tunneling speed is a period of time;
s4, substituting the formula II to the formula seven into the formula I to obtain the formula eight:
the formula eight:
Figure FDA0003554278840000025
calculating the mud escaping flow rate q at the current moment according to the formula eights1,qs1The formula nine is used to obtain:
the formula is nine:
Figure FDA0003554278840000026
s5, when the stratum is stable and the tunneling is normal, taking the calculated value of the mud escaping flow rate at the previous moment as the predicted value of the mud escaping flow rate at the next moment; comparing the predicted value and the measured value of the mud escaping flow speed at the current moment, and judging the mud escaping state; when the measured value is greater than the predicted value, the loss rate of the slurry is high, the possibility of mud film damage is increased, the slurry feeding density is improved, and the support pressure is reduced; when the measured value is smaller than the predicted value, reducing the slurry feeding density, and maintaining or accelerating the shield tunneling speed;
s6, monitoring the slurry discharge density in real time, taking the measured value of the slurry discharge density at the previous moment as the predicted value of the slurry discharge density at the next moment when the stratum is stable and the tunneling is normal; estimating the pulp discharge density at the next moment according to the calculated value of the pulp discharge density at the previous moment, and comparing the predicted value and the calculated value of the pulp discharge density at the current moment to judge whether the risk of potential collapse exists; when the measured value is larger than the predicted value, the excavation face is likely to have local collapse, the propulsion is stopped, the slurry cabin is desilted, and the supporting pressure is improved until the balance is reestablished; when the measured value is smaller than the predicted value, continuing to advance;
wherein, the steps S5 and S6 are performed synchronously.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0460096A (en) * 1990-06-27 1992-02-26 Toda Constr Co Ltd Slurry type shield excavating device
CN101705827A (en) * 2009-10-21 2010-05-12 上海隧道工程股份有限公司 Muddy water and air balance shield pressure control method and device
CN106568682A (en) * 2016-11-03 2017-04-19 上海隧道工程有限公司 Slurry balanced shield slurry density detecting device and detecting method
CN106979747A (en) * 2017-02-23 2017-07-25 广州市市政集团有限公司 Slurry shield cubic metre of earth measuring management method
CN107255032A (en) * 2017-08-09 2017-10-17 中铁隧道集团二处有限公司 A kind of method that utilization densitometer calculates slurry shield machine amount of slag
CN110863833A (en) * 2019-11-22 2020-03-06 中铁隧道局集团有限公司 Tunneling parameter control process of tunnel shield tunneling starting end boulder area shield tunneling machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0460096A (en) * 1990-06-27 1992-02-26 Toda Constr Co Ltd Slurry type shield excavating device
CN101705827A (en) * 2009-10-21 2010-05-12 上海隧道工程股份有限公司 Muddy water and air balance shield pressure control method and device
CN106568682A (en) * 2016-11-03 2017-04-19 上海隧道工程有限公司 Slurry balanced shield slurry density detecting device and detecting method
CN106979747A (en) * 2017-02-23 2017-07-25 广州市市政集团有限公司 Slurry shield cubic metre of earth measuring management method
CN107255032A (en) * 2017-08-09 2017-10-17 中铁隧道集团二处有限公司 A kind of method that utilization densitometer calculates slurry shield machine amount of slag
CN110863833A (en) * 2019-11-22 2020-03-06 中铁隧道局集团有限公司 Tunneling parameter control process of tunnel shield tunneling starting end boulder area shield tunneling machine

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