CN106295057B - A kind of earth pressure balanced shield, EPBS Tu Cang is into Ground surface settlement method caused by casting - Google Patents
A kind of earth pressure balanced shield, EPBS Tu Cang is into Ground surface settlement method caused by casting Download PDFInfo
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- CN106295057B CN106295057B CN201610707226.4A CN201610707226A CN106295057B CN 106295057 B CN106295057 B CN 106295057B CN 201610707226 A CN201610707226 A CN 201610707226A CN 106295057 B CN106295057 B CN 106295057B
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Abstract
The invention discloses a kind of earth pressure balanced shield, EPBS Tu Cang into Ground surface settlement method caused by casting.According to shield initial phase of boring tunneling data and ground settlement data, by the relational expression for deriving Stratum Loss caused by shield driving parameter (N/v) and shield casting, inverse goes out screw conveyor casting efficiency eta and ground settlement groove width i, establishes Ground surface settlement formula of the shield when next ring tunnels:Next ring boring parameter is selected, formula is substituted into and calculates, to realize the prediction to earth's surface sedimentation value.The present invention is simple and practical, and adaptability is good, from shield driving mechanism establish Tu Cang into casting and ground settlement relational expression, can ground settlement caused by Accurate Prediction boring parameter, avoid earth's surface from generating excessive protuberance and sedimentation value.
Description
Technical field
The present invention relates to a kind of Ground surface settlement methods, and specifically, the present invention relates to a kind of earth pressure balanced shield, EPBS soil
Storehouse is into Ground surface settlement method caused by casting.
Background technique
Important engineering method one of of the earth pressure balanced shield, EPBS engineering method as soft soil layer tunnel excavation is widely used in each both at home and abroad
In metropolitan subway construction.However, having when excessive surface uplift caused by earth pressure balanced shield, EPBS tunneling construction and depression phenomenon
Occur, ground settlement caused by shield driving still lacks practical, accurate prediction technique at present.
Ground settlement is derived from Stratum Loss.The loss of earth's surface caused by shield driving is mainly made of three parts, comprising: 1) shield
Structure cutterhead reaches soil body Shi Tucang into Stratum Loss caused by casting；2) caused Stratum Loss when shield passes through；3) shield tail is infused
Stratum Loss caused by slurry is insufficient.In three parts Stratum Loss, shield cutter reaches soil body Shi Tucang into caused by casting
Layer loss mainly due to shield driving parameter with strata condition is incompatible causes.In each boring parameter of earth pressure balanced shield, EPBS
In, the driving speed influence Tu Cang of shield is measured into soil, and the revolving speed of screw conveyor influences native storehouse soil discharge quantity, and Tu Cang is put down into casting
Weighing apparatus affects the deformation of earth's surface, under specific geological conditions and ambient environmental conditions caused by prediction shield driving parameter
The control of table settlement values, selection and earth's surface deformation for shield driving parameter is of great significance.
In currently practical construction, the boring parameter of EPB shield tunneling is more controlled according to the experiences of shield drivers, simultaneously
It is fed back by surface subsidence monitoring value, when monitor value has transfinited or close to limit value, then adjusts screw conveyor speed or push away
Into speed.This method there are three disadvantages, disadvantage first is that shield driving state modulator quality, be heavily dependent on shield
The operating technology of structure driver, and the shield operating experience under similar stratum and buried depth；Disadvantage is second is that ground settlement information is anti-
Present too late, when shield driver obtains replacement boring parameter information, excessive sedimentation or protuberance are had occurred and that, pipeline it is intensive, build
(structure) builds the city that object stands in great numbers, and feedback procedure is slow, may cause excessive loss；Disadvantage third is that digging control process similar to black box
Behavior, both the guidance foundation without tunneling process, the also clear range without boring parameter.
Chinese invention patent (application number: 201510746893.9, a kind of patent name: control of shield machine driving speed
Method) relate generally to the control method of shield machine driving speed.The method, can be with by adjusting the Control for Speed Limitation potentiometer of shield machine
The driving speed of shield machine is set to be greater than zero, less than or equal to the driving maximum speed of setting.I.e. the invention is provided from mechanical angle
A method of control shield driving speed is not directed to shield driving speed and specifically should to command speed and lower speed
The range of control.
Chinese invention patent (application number: 201310365004.5, patent name: electric tunnel shield construction ground is maximum
Sedimentation value prediction technique) relate generally to a kind of maximum sedimentation value of electric tunnel shield construction ground surface prediction technique.This method will disturb
Dynamic load is reduced to a taper load, is based on soil body mean value elastic half-space it is assumed that using Bu Xineisike solution and Integral Processing
Obtain ground maximum settlement value.The invention fails to consider that Tu Cang is that error is biggish for shield tunnel into casting state,
In practice, when native storehouse In-pit dumping amount, which is continued for less than, to be measured into soil, support pressure is excessive, can cause land upheaval.Obviously, the invention
Having ignored into casting influences, and simple thinks that shield tunnel centainly settles, and ground settlement caused by this tunnels shield tunnel is pre-
Survey is unreasonable.
Chinese invention patent (application number: 201110379662.0, patent name: urban rail transit shield forewarning on engineering failure
Prediction technique) relate generally to a kind of prediction method for urban rail transit shield project.The invention is by analysis in shield tunnel
The factor that ground settlement is influenced in road introduces many coefficients and forms prediction theory formula, in conjunction with engineering measurement data, using more
The statistical methods such as first linear regression are fitted unknown parameter, form predictor formula, carry out Ground surface settlement.The invention it is main not
Foot has: 1, Ground surface settlement formula is coarse, and the item at left and right sides of equation does not meet " dimension is consistent " principle, that is to say, that this
Predictor formula is invalid in the physical sense.2, shield is not probed into deeply into earth's surface deformation relationship caused by casting, is relied on
A large amount of measured datas are fitted unknown parameter using statistical means such as linear regressions.The main problem of such statistical method has: problem 1
It is the project data based on early period come fitting parameter, forms predictor formula, for exceeding the boring parameter of experience, fitting parameter is taken
Value is inaccurate, that is, the similar stratum tunneled and buried depth is only applicable to, for fitting formula adaptability under new environmental condition
Difference；Problem 2, which is that statistical data is sufficient, just can guarantee fitting precision, need to acquire and safeguard a large amount of field datas, troublesome in poeration.
Summary of the invention
High, pre- flow gauge quantization that technical problem to be solved by the invention is to provide a kind of precision of predictions, clear, prediction at
This cheap, simple and practical earth pressure balanced shield, EPBS Tu Cang is into Ground surface settlement method caused by casting.
In order to solve the above technical problem, the present invention provides earth pressure balanced shield, EPBS Tu Cang into ground settlement caused by casting
Prediction technique, comprising the following steps:
Step (1): when shield is in tunneling process, and support pressure starts to stablize, measurement shield in an endless tube piece time T
Structure is discharged dregs volume V and dregs weight G and obtains the severe γ of dregs by dregs weight G divided by dregs volume V1；Record
Driving speed v, screw conveyor revolving speed N, sediment improvement material add weight G1；
Step (2): screw conveyor discharge dregs severe G and shield inherent parameters, that is, thread pitch when in conjunction with shield driving
P, spiral shell machine core shaft diameter D1With spiral shell machine internal diameter D2, based on the unearthed efficiency eta of formula (1) inverse screw conveyor:
Wherein: N is screw conveyor revolving speed, D2For screw machine internal diameter, D1For screw machine shaft diameter, P is between rotating vanes
Away from；
Step (3): dregs weight G, the practical soil excavation weight G of shield are discharged according to shield1, the addition of sediment improvement material
Weight G2, calculate effectively to be unearthed in T time based on formula (2) and compare Ke:
Step (4): parameter i.e. original place layer severe γ is surveyed in combination2With driving speed v, shield reason is calculated based on formula (3)
G is measured by into soil3；It is theoretical to measure G into soil in shield driving T time in the case where absolutely not Stratum Loss3Are as follows:
Step (5): compare K in conjunction with being effectively unearthede, spiral shell machine be unearthed efficiency eta, screw conveyor revolving speed N, screw conveyor parameter
That is thread pitch P, spiral shell machine core shaft diameter D1With spiral shell machine internal diameter D2, dregs severe γ1, stratum severe γ2, shield driving diameter D with
Driving speed v calculates Stratum Loss value V caused by native storehouse casting using formula (4)loss:
Step (6): in conjunction with Stratum Loss value and actual measurement ground settlement value is calculated, pass through formula (5) inverse ground settlement slot
Width i:
Wherein: SmaxFor earth's surface maximum settlement point；X is the distance on cross section apart from tunnel central axis；I is heavy for ground
Groove width is dropped, is distance of the subsidence curve symmetrical centre to knee of curve；
Step (7): the Ground surface settlement formula for considering shield driving parameter is established by formula (6):
Step (8): shield substitutes into formula (6) in new driving ring, by shield driving parameter, can predict that earth's surface will generate
Sedimentation value.
In a new P. drechsleri, above-mentioned calculating step is repeated, new Ground surface settlement formula is obtained.
Earth pressure balanced shield, EPBS Tu Cang by adopting the above technical scheme is into Ground surface settlement method caused by casting, not always
Settlement prediction, but when the shield cutter arrival soil body, the earth's surface generated since boring parameter is incompatible with strata condition is heavy
Drop, therefore claim ground settlement caused by shield driving parameter, this part is deposited in the total settlement of shield driving overall process generation
Account for critical role.
Initial phase of boring described in step (1) is not examination phase of boring, refers to that soil pressure has been completely set up in native storehouse,
Shield starts the stage normally tunneled.
The unearthed efficiency eta of step (1) screw conveyor and step (5) described ground settlement groove width i are all in accordance with upper one
The actual measurement ground settlement data inverse of ring obtains.Compared with through the method for experience value, method applicability provided by the invention
Stronger, error derives from the stratum difference and boring parameter difference of adjacent section of jurisdiction.
The Ground surface settlement formula of shield driving parameter described in step (7), shield is after one ring of every driving, because of stratum
Parameter, buried depth and sediment improvement Parameters variation need to re-start calculating according to above-mentioned process, to guarantee Ground surface settlement public affairs
Formula has degree of precision.
Compared with prior art, the present invention the technical effects of the invention are that: process provides earth pressure balanced shield, EPBS picks
Into speed, the quantitative relationship of screw conveyor casting speed and ground settlement, the unearthed efficiency eta of screw conveyor and earth's surface are given
The quantization strategy of groove width i is settled, provides one kind for the analysis of Ground surface settlement caused by earth pressure balanced shield, EPBS boring parameter
New scientific method:
Effect (1) can be mentioned by step (6) in the case where driving speed and bolt conveyer casting speed are set
The sedimentation that the formula predictions earth's surface of confession will generate.Other than the prediction techniques such as method for numerical simulation, mathematical statistics method, we
It is bright to provide a kind of Ground surface settlement method for fully considering shield into casting state, precision of prediction height of the present invention, pre- flow measurement
Journey quantifies, is clear, and forecast cost is cheap, simple and practical.
Effect (2) complete, quantization the Ground surface settlement technology path that there is provided a set of based on boring parameter.
In conclusion the present invention is a kind of high precision of prediction, pre- flow gauge quantization, clear, forecast cost is cheap, simple reality
Earth pressure balanced shield, EPBS Tu Cang is into Ground surface settlement method caused by casting.
Detailed description of the invention
Fig. 1 is the shield into Ground surface settlement Technology Roadmap caused by casting.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
Referring to Fig. 1, earth pressure balanced shield, EPBS Tu Cang is into Ground surface settlement method caused by casting, comprising the following steps:
Step (1): when shield is in tunneling process, and support pressure starts to stablize, measurement shield in an endless tube piece time T
Structure is discharged dregs volume V and dregs weight G and obtains the severe γ of dregs by dregs weight G divided by dregs volume V1；Record
Driving speed v, screw conveyor revolving speed N, sediment improvement material add weight G1；
Step (2): screw conveyor discharge dregs severe G and shield inherent parameters, that is, thread pitch when in conjunction with shield driving
P, spiral shell machine core shaft diameter D1With spiral shell machine internal diameter D2, based on the unearthed efficiency eta of formula (1) inverse screw conveyor:
Wherein: N is screw conveyor revolving speed, D2For screw machine internal diameter, D1For screw machine shaft diameter, P is between rotating vanes
Away from；
Step (3): dregs weight G, the practical soil excavation weight G of shield are discharged according to shield1, the addition of sediment improvement material
Weight G2, calculate effectively to be unearthed in T time based on formula (2) and compare Ke:
Step (4): parameter i.e. original place layer severe γ is surveyed in combination2With driving speed v, shield reason is calculated based on formula (3)
G is measured by into soil3；It is theoretical to measure G into soil in shield driving T time in the case where absolutely not Stratum Loss3Are as follows:
Step (5): compare K in conjunction with being effectively unearthede, spiral shell machine be unearthed efficiency eta, screw conveyor revolving speed N, screw conveyor parameter
That is thread pitch P, spiral shell machine core shaft diameter D1With spiral shell machine internal diameter D2, dregs severe γ1, stratum severe γ2, shield driving diameter D with
Driving speed v calculates Stratum Loss value V caused by native storehouse casting using formula (4)loss:
Step (6): in conjunction with Stratum Loss value and actual measurement ground settlement value is calculated, pass through formula (5) inverse ground settlement slot
Width i:
Wherein: SmaxFor earth's surface maximum settlement point；X is the distance on cross section apart from tunnel central axis；I is heavy for ground
Groove width is dropped, is distance of the subsidence curve symmetrical centre to knee of curve；
Step (7): the Ground surface settlement formula for considering shield driving parameter is established by formula (6):
Step (8): shield substitutes into formula (6) in new driving ring, by shield driving parameter, can predict that earth's surface will generate
Sedimentation value.
In a new P. drechsleri, above-mentioned calculating step is repeated, new Ground surface settlement formula is obtained.
Claims (2)
1. a kind of earth pressure balanced shield, EPBS Tu Cang is into Ground surface settlement method caused by casting, it is characterised in that: including following step
It is rapid:
Step (1): when shield is in tunneling process, and support pressure starts to stablize, measurement shield in an endless tube piece time T is arranged
The soil body of slagging tap product V and dregs weight G obtains the severe γ of dregs by dregs weight G divided by dregs volume V1；Record driving
Speed v, screw conveyor revolving speed N, sediment improvement material add weight G2；
Step (2): screw conveyor discharge dregs severe G and shield inherent parameters, that is, thread pitch P, spiral shell when in conjunction with shield driving
Revolve conveyer axle diameter D1With screw conveyor internal diameter D2, based on the unearthed efficiency eta of formula (1) inverse screw conveyor:
Wherein: N is screw conveyor revolving speed, D2For screw conveyor internal diameter, D1For screw conveyor axle diameter, P is screw thread section
Away from；
Step (3): dregs weight G, the practical soil excavation weight G of shield are discharged according to shield1, sediment improvement material addition weight
G2, calculate effectively to be unearthed in T time based on formula (2) and compare Ke:
Step (4): parameter i.e. original place layer severe γ is surveyed in combination2With driving speed v, shield theory is calculated into soil based on formula (3)
Measure G3；It is theoretical to measure G into soil in shield driving T time in the case where absolutely not Stratum Loss3Are as follows:
Step (5): compare K in conjunction with being effectively unearthede, screw conveyor be unearthed efficiency eta, screw conveyor revolving speed N, screw conveyor ginseng
Number is thread pitch P, screw conveyor axle diameter D1With screw conveyor internal diameter D2, dregs severe γ1, stratum severe γ2、
Shield driving diameter D and driving speed v calculates Stratum Loss value V caused by native storehouse casting using formula (4)loss:
Step (6): in conjunction with Stratum Loss value and actual measurement ground settlement value is calculated, pass through formula (5) inverse ground settlement groove width
I:
Wherein: SmaxFor earth's surface maximum settlement value；I is ground settlement groove width；
Step (7): the Ground surface settlement formula for considering shield driving parameter is established by formula (6):
Wherein, x is the distance on cross section apart from tunnel central axis, and P is thread pitch；
Step (8): shield substitutes into formula (6) in new driving ring, by shield driving speed v, screw conveyor revolving speed N, can be pre-
The sedimentation value that geodetic table will generate.
2. earth pressure balanced shield, EPBS Tu Cang as described in claim 1 is into Ground surface settlement method caused by casting, feature exists
In: in a new P. drechsleri, above-mentioned calculating step is repeated, iteration updates the unearthed efficiency eta of screw conveyor and earth's surface is heavy
Groove width i is dropped, new Ground surface settlement formula is obtained.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107165642A (en) * | 2017-06-06 | 2017-09-15 | 中铁十九局集团轨道交通工程有限公司 | Accurately control the shield construction method of ground settlement |
| CN110059448B (en) * | 2019-05-22 | 2021-08-27 | 中南大学 | Shield excavation surface settlement prediction method considering cutter head extrusion stratum deformation |
| CN111382473A (en) * | 2020-02-13 | 2020-07-07 | 浙江大学城市学院 | Method for predicting underground pipeline settlement caused by transverse crossing of shallow tunnel |
| CN111414574B (en) * | 2020-03-17 | 2023-08-08 | 南京理工大学 | Method for rapidly calculating soil discharge amount of soil pressure balance shield machine |
| CN112131530B (en) * | 2020-09-24 | 2024-03-19 | 盾构及掘进技术国家重点实验室 | Calculation and early warning method for slag discharge amount of earth pressure shield based on big data |
| CN112324451A (en) * | 2020-11-02 | 2021-02-05 | 辽宁工程技术大学 | Earth surface settlement and pipeline deformation early warning system based on muck monitoring for earth pressure balance shield |
| CN114118603B (en) * | 2021-12-02 | 2022-06-14 | 华南理工大学 | Soil pressure balance shield slag discharge amount estimation and correction method |
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| JPH03275899A (en) * | 1990-03-27 | 1991-12-06 | Taisei Corp | Excavation method of shield tunnel |
| CN103195435A (en) * | 2013-03-22 | 2013-07-10 | 同济大学 | Method for preventing shield penetration of building compact district from inducing ground subsidence |
| CN104766129A (en) * | 2014-12-31 | 2015-07-08 | 华中科技大学 | Subway shield construction surface deformation warning method based on temporal and spatial information fusion |
| CN105257312A (en) * | 2015-11-06 | 2016-01-20 | 上海市机械施工集团有限公司 | Control method of advance rate of shield tunneling machine |
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- 2016-08-23 CN CN201610707226.4A patent/CN106295057B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03275899A (en) * | 1990-03-27 | 1991-12-06 | Taisei Corp | Excavation method of shield tunnel |
| CN103195435A (en) * | 2013-03-22 | 2013-07-10 | 同济大学 | Method for preventing shield penetration of building compact district from inducing ground subsidence |
| CN104766129A (en) * | 2014-12-31 | 2015-07-08 | 华中科技大学 | Subway shield construction surface deformation warning method based on temporal and spatial information fusion |
| CN105257312A (en) * | 2015-11-06 | 2016-01-20 | 上海市机械施工集团有限公司 | Control method of advance rate of shield tunneling machine |
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