盾构隧道掘进方向控制技术.doc

1、盾构隧道掘进方向控制技术No.Volume 331Shanxi ArchitectureVol. 33 No. 13242007JanuarySHANXI ARCHITECTUREJan. 2007Article number: 100926825 (2007) 0120324202Direction control technique of shield tunnelingDengyongshuangAbstractCombining with engineering exampleThe main factors affecting the direction of shield tunn

2、eling are analyzed from the aspects of shield and weight, shield folding angle and segment selection, geological factors and so onAnalysis and summaryAnd put forward the corresponding solutionGood results have been achievedIt provides a basis for shield construction of subway tunnel.Key word: tunnel

3、HeadingShield constructionCLC number: U455. 43In order to cure overcrowding, traffic congestion, environmental pollution and other urban common problemsMany citiesThe city is planning and building underground railwaysRiver Crossing TunnelGroundwater pipelineCommunication, power supplyCableHeating, g

4、as pipelines, and other deep underground space development projects. In the cityCity Tunnel ConstructionShield construction method is widely used. Open cut method and pipe jacking methodThe method is compared with immersed tube method and mine methodShield tunneling has the function of urban residen

5、tsSmall interference, environmental impact, light pollution and other unique advantages. So farShield tunneling methodDocument identifier: AHas more than 100 years of history, in the tunnel construction method and run parallel to each other thanCompared with the competition, the construction of shie

6、ld method shows great vitality. Although the shield toolThere are many advantages, but because of the thrust of the shield when the track is up, Zuo YoupianThe shift, commonly known as snake, and with the construction of a tunnel excavation molding, once formed is difficult1) shield machine weight.

7、The weight distribution of the host image shield was described as head feetThe light only depends on the thrust of the driving force and the friction force of the working face, which is not enough to maintain the attitude of the shield,Shield itself often has bow tendency, especially in the downhill

8、 driving phenomenonMore serious.2) the folding angle and segment selection in shield tunneling. Shield front and shield tail are articulated oilThe larger the middle turn angle of the cylinder connection, the more difficult it is for the shield to move forward and the more difficult to control the d

9、riving direction,Moreover, the segment selection is more difficult, in order to meet the requirements of the shield tail clearance and meet the requirements of the alignmentThe more prominent the contradiction.3) geological factors. In the course of construction, due to the uneven formation of soft

10、rock in the cross section,The force and torque change greatly, and the shield hosts tend to drift to the soft side of the formation,Heading is harder to control.Process as backgroundProcessing. Especially in the complex geological conditions, formation of soft and hard changes frequently, tunnel exc

11、avationThis paper takes the Guangzhou metro line two tunnel between Yuexiu Park and Sanyuanli sectionThrough engineering practice, it can be concluded that cross soft and hard interaction changes frequentlyInfluence factors of directional control of stratum shield tunneling and corresponding treatme

12、nt measuresFor todayIt provides reference for shield construction of urban subway tunnel.1 project overviewGuangzhou metro line two Yuexiu park to Sanyuanli Tunnel Shield ProjectFrom Yuexiu Park station to Guangzhou Railway Station, Guangzhou Railway Station to Sanyuanli Station two intervals double

13、Hole tunnel composition. There are three sets of six curves in two intervals. Yuexiu park toGuangzhou Railway Station; distribution; two sets of curvesThe turning radii are600 m, 400 m; Guangzhou fireA set of curves are distributed between the station and Sanyuanli StationThe turning radius is400 m.

14、 Overburden soil on TunnelMaximum thickness24 m, minimum about9m.The geological conditions of this interval project are complexThe ground soil along the engineering is in accordance with its lithology and age,The origin and physical and mechanical differences can be divided into nine layers from top

15、 to bottomThe overlying strata of the tunnelThe artificial fill layer, the sea land interaction layer, the alluvial sand deposit layer, the alluvial flood soil layer and the residual deposits are usedSilty clay is the main layerLocal weathered rock formation. The section of the tunnel passes through

16、 most of the strataThey are strongly weathered rock, middle weathered rock and aeolian rockThere are a few of them are all weathered rock and residual soilFracture zone and fracture zoneLithology is mainly siltstone, coarse sand and sand conglomerateRock DaysHowever, the maximum value of uniaxial co

17、mpressive strength is76.2 MPa.2 tunnel direction controlThe direction control of shield tunneling is based on the design curve of the tunnelPlaneReferred to as the trend and tendency of linear elements, the longitudinal slope rate line as the linear parameterDAT),Through the effective control of the

18、 stroke, swing and roll of the propulsion cylinder when the shield is advancingShieldThe spatial position and attitude approach of the manipulatorDAT valueSo that the deviation is minimized.2.1 influencing factorsConsidering the complicated geological conditions of the projectIn shield construction,

19、 more than three shield workers are selectedThe first section of the railway from Sanyuanli to railway station is an attempt to analyze the factors affecting the driving directionTest sectionThrough field testSeveral main factors affecting the direction of shield tunneling are summarizedas follows:D

20、ate of receipt: 2006206208It makes the operation and axis control in the propulsion process very difficult. In especialWhen the hard and soft uneven stratum distributes in the curved line section and the line steep slope sectionThis is nowThe elephant is more pronounced. Over three shield tunnel for

21、mation changes greatlyHard and soft uneven,And the curve is many, the slope change is bigThis makes it more difficult to control the direction of driving when the shield is advancingAdd difficultiesDirection deviation is easy to occur.2.2 solutionsAccording to the domestic and foreign experience in

22、the construction of shield tunneling process between three to fireAnalysis researchAccording to the engineering geological condition and the construction condition of the over three shield,The following control methods are adopted to control the direction of tunneling:1) the problem of the self weig

23、ht distribution of shield machinesBy adjusting different parts of shieldPropulsion pressureOvercome the tendency to bow. Generally speaking, we need to increase the thrust force of the lower part of the shieldPass.Maintain the smooth progress of the shield through the difference between the upper an

24、d lower propulsion forces. Through field test,Shield machine for over three shield worksWhen the lower propulsion oil pressure of the cylinder is highUpper advancing cylinderAt 2 MPaThe structure of the shield machine can basically be solved because of the structure of the shield machineBow phenomen

25、onOn the downhill side(within 30 per thousand.)Tunneling,Upper and lower advancing cylinderHydraulic differenceShould be controlled in4 MPa or soFor heterogeneous formationIn particular, softDownhill driving of hard formationsThe hydraulic pressure difference between the upper and lower propulsion c

26、ylinders must be adjusted to6 MPa or moreAnd even reach8 MPa or soIn order to guarantee the edge of shield tunnelingDA TCurve driving.2) there are two ways of folding and fixing in shieldThe fixed way has the selection of segmentbenefitThe following mode is advantageous to the driving direction cont

27、rol. The shield used by the shield is over threetypeAnd according to the analysis and research of the fire shield between three large amounts of dataThe follower is adoptedThe maximum stroke difference of articulated cylinder shall not exceed that of the articulated cylinder20 mm, and should not be

28、in the tunneling processMiddle adjusting articulated cylinderInstead, the drag of the articulated cylinder should be used during the installation of the segmentDevice adjustment. During the adjustment process, the adjustment amount of each driving cycle shall not exceed10 mm, so that the uniformity

29、of the shield gap and the effectiveness of the articulated seal can be guaranteed.3) for the formation of large changes, soft and hard unevenAnd the curve is many, the slope change big groundparagraphThe stratigraphic distribution of the driving face should be mastered beforehandPreliminary tunnelin

30、g plan shall be worked outApplication;A technical disclosure meeting will be held before workTell the operator to stay in the formationAnd possible problems. Control of shield tunneling direction for soft and hard composite strata,Brief introduction of the author: Deng Yongshuang(19772) maleEngineer

31、Shenzhen Municipal Engineering Design InstituteGuangdong, ShenzhenFive hundred and eighteen thousand and thirty-five1994-2009, China, Academic, Journal, Electronic, Publishing, House., All, rights, reserved., No.Volume 331Shanxi ArchitectureVol. 33 No. 12007JanuarySHANXI ARCHITECTU

32、REJan. 2007 - 325Article number: 100926825 (2007) 0120325203Bao Xi railway channel at the Tianshan Mountain Geological line selectionCytotoxicAbstractTaking engineering geology special structure of the Tianshan Mountain Area Based onFor the stage of feasibility studyIVCK, C6, K, CK, ICK and other fo

33、ur crossing schemes are analyzed comparedchooseThe geological route selection in the preliminary design stage is further discussedFor reference to other similar projects.Key wordGeological route selectionStratigraphic structureThrough schemeCLC numberU412. 32 document identifier: A1 profiles are div

34、ided into two. The tunnel leads lots of narrow valleyMultiple presentationV typeLoess slope stabilityBao Xi railway channel is a national highLiu (XI) LiuA qualitative difference in (a state) passageLandslide, collapse, geological development etc.Yangmahe, Sichuan, Panlong Valley coal minebranchTota

35、l line length561.1 km. Along the way, the three cities of Yulin, Yanan and Weinan in Shaanxi province are empty and widespreadThe mined out area is largerThis causes great difficulties in line selection.The area passes through the northern part of Shaanxi province. Tianshan Mountain is located in Ya

36、nan city,Is xiuyanhe and BeaulieuThe watershed of sichuan. The mountain is thicker, the middle part of the mountain is cut deep, and the Tianshan mountain will be cut2 geological conditions where the historic reviewSandy loess is widely distributed, the thickness of 20 m 120 m tunnel are involved in

37、 import and exportIt is usually necessary to increase the thrust of the cylinder in the harder formation area. When the driving direction is partialIn time, the deviation should be corrected in time, but due to the large size and self importance of the shield, the deviation should not be correctedIf

38、 it is too urgent, it will cause partial stress on the segment and cause partial breakage of the segmentCrack. At the same time, it is also easy to cause excessive correction, and have a greater impact on the alignmentSlow rectification is beneficial to the formation of segment tunnel.4 ConclusionIn

39、 this paper, Guangzhou metro line two, Yuexiu park to Sanyuanli Guangzhou section of the tunnel shieldIn the background of structure engineering, the weight distribution, geological condition, folding angle and slice of shield are analyzedShield, tunneling, direction, control, technologyDENG Yong2sh

40、uangAbstract: Combined, with, practical, engineering, this, paper, analyzes, and, summarizes, the, main, factors, influenced, shield, from, tunneling, directionDeadweight, of, shield, machine, selection, of, bending, angle, and, piece, in, tunnel, shield, duct, and, geologic, factors, and, proposes,

41、 relevant, solutionsWhich, have, achieved, well, effects, in, order, to, offer, a, reference, for, similar, subway, construction., tunnel, shieldKey words: tunnel, tunneling, direction, tunnel, shield, constructionDate of receipt: 2006206222Brief introduction of the author: Fan Chunlin(19722) maleEn

42、gineerThe geological survey of the first survey and Design Institute of the railwayShaanxi, XianSeven hundred and ten thousand and forty-three1994-2009, China, Academic, Journal, Electronic, Publishing, House., All, rights, reserved., degreeThe selection of the film will be even mo

43、re difficult. In the course of tunneling, shield vibration andAt present, the method of reducing the driving force of the excavation can be adopted to reduce the driving penetrationWhen necessary, boot boots on the front shield of the shield are started. If the shield turns around,asThe driving meth

44、od of positive and reverse cutter heads can be adopted to correct the deviation.Comparative analysis of directional deviation of 3 shield tunnelingThrough the analysis of the influence factors of the propulsion direction of test sectionIn accordance with the proposed settlementThe case will be carri

45、ed out on the section of the second to three railway station to Yuexiu Park StationField constructionThe excavation deviation data of measurement is analyzed.The longitudinal section of the first section of the shield to Sanyuanli railway station between the first and the three shield worksThe devia

46、tion of heading direction is larger in the early stage of tunnelingSome even more than the design allowsvalueOther measures have to be taken to meet the requirements of the alignment design. Its mainThe reason is that the control standard and rectification method are not feasible in the early stageR

47、ules of conduct,At the same time, it is not familiar with the machine condition and equipment performance of shield machineIn addition toAccording to the geological condition of the longitudinal section of the tunnelIt can be seen that there are lots of different soft and hard formationsIt is more d

48、ifficult to control the direction of headingEspecially in the areas where the formation lithology changesDig.The direction is easier to showHunting.Longitudinal section and excavation of three shield stations, second railway stations and Yuexiu Park StationAdvancing directionThrough the improvement

49、of the construction method of the first section shield projectLater shieldThe heading deviation has been effectively controlledIts basically in control.50 mm vanEnclosure. From the absolute value of the deviation between the driving direction and the axis of the designIn the square of waterUp and fi

50、rst section(three to fire range)Compared to a relatively large deviation valueBut relativelyFluctuation range is smallMainly, the correction of the second section is within the reasonable range of deviationInfluence of type selection on direction of shield tunnelingThe corresponding solutions are put forwardAnd apply toTrain station Yuexiu Park station section to guide the constructionGood results have been achieved. By thisThe following conclusions can be drawn from this studyWhen the driving direction deviates from the desi