Direction Deviation Control During Double-O-Tube (DOT) Tunnel Construction

Shen, Shui‐Long; Cai, Fangbo; Bai, T.H.; Zhu, Jiang

doi:10.1061/40867(199)22

Cited by 5 publications

(7 citation statements)

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“…1, shield shell; 2, cutter; 3 copy cutter; 4, observation hole; 5, manhole; 6, soil chamber; 7, screw conveyor; 8, jack; 9, segment assembling device. ing DOT construction, rolling occurs due to one, or a combination of several, of the aforementioned reasons (RANSTT 1998;Yonei 2000;Ishihara et al 2003;Shen et al 2006). …”

Section: Causes Of Rollingmentioning

confidence: 98%

“…Even a small tunnel rolling angle will cause considerable redistribution of internal stresses in lining segments ). (4) The intersected concave area between the two tunnels weakens the waterproof function during excavation (Ishihara et al 2003;Shen et al 2006). (5) Subsoils can easily stick and pile up in the intersected concave area and will move together with the shield machine, which is called the ''back-soil'' phenomenon.…”

Section: Disadvantages Of Double-o-tunnels (Dots)mentioning

confidence: 98%

“…(3) The dumbbell shape of DOTs leads to a much more complex and nonuniform distribution of internal stress in linings than that of circular shield tunnels, which consequently results in a potentially less stable lining and difficulty in lining assembly (Shen et al 2006. Even a small tunnel rolling angle will cause considerable redistribution of internal stresses in lining segments ).…”

Section: Disadvantages Of Double-o-tunnels (Dots)mentioning

confidence: 98%

“…(6) Due to the special configuration of the DOT shield, it is difficult to control the centerline of the DOT during construction. In other words, it is difficult to control the moving trajectory of the DOT shield (Ishihara et al 2003;Shen et al 2006). Figure 4 schematically illustrates the moving trajectory of a DOT shield during construction.…”

Section: Disadvantages Of Double-o-tunnels (Dots)mentioning

confidence: 99%

“…Figure 3 shows a recorded case of the asymmetrical surface settlement trough of a DOT constructed in Tokyo (Yonei 2000). The asymmetrical distribution of the settlement trough may be due to the operation of rolling correction during DOT tunneling (Iida and Sumida 1992;Yonei 2000;Ishihara et al 2003;Shen et al 2006Shen et al , 2009.…”

Section: Introductionmentioning

confidence: 97%

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Evaluation of the effect of rolling correction of double-o-tunnel shields via one-side loading

Shen

Luo

2010

Can. Geotech. J.

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During construction of a double-o-tunnel (DOT), rolling will inevitably occur due to the following: (i) nonuniformity of subsoil condition, (ii) manufacturing errors in the DOT shield machine, (iii) different pulling forces at two sides of the DOT, (iv) effect of assembled segments, (v) loss of grout, and (vi) inappropriate operation. In engineering practice, rolling correction using a one-side load at the elevated side is a cost-effective method. The weight of the one-side load is determined by the experience of the engineers and (or) through observation of the returned rolling angle. However, these methods cannot predict the value of the one-side load before applying it. This paper presents a series of finite element analyses that was performed to investigate the relationship among the one-side load, rolling angle, and subsoil deformation. The analytical results show that the proposed approach can predict field-observed data well. It is concluded that analytical results can be used as guidance for DOT construction.Résumé : Pendant la construction d'un tunnel double circulaire (« double-o-tunnel, DOT »), il y aura inévitablement du roulage pour les raisons suivantes : (i) des conditions de sous-sol non uniformes; (ii) des erreurs lors de la manufacture du bouclier pour foncer le tunnel DOT; (iii) des forces différentes tirant de chaque côté du tunnel DOT; (iv) les effets des segments assemblés; (v) les pertes de coulis; (vi) une opération inappropriée. Dans la pratique, une méthode efficace et peu coûteuse est la correction du roulage par l'ajout d'une charge d'un côté, du côté élevé. Le poids de la charge est déter-miné par l'expérience des ingénieurs et (ou) par l'observation de l'angle de roulage suite à l'application de la charge d'un côté. Cependant, ces méthodes ne peuvent pas prédire la valeur de la charge avant son application. Cet article présente des analyses par éléments finis qui ont été effectuées pour évaluer la relation entre la charge d'un côté, l'angle de roulage et la déformation du sous-sol. Les résultats analytiques démontrent que l'approche proposée permet de bien prédire les observations sur le terrain. On peut ainsi conclure que les résultats analytiques peuvent être utilisés pour diriger la construction d'un DOT.Mots-clés : bouclier pour le fonçage d'un tunnel double circulaire (« DOT »), correction du roulage, charge d'un côté, analyse par éléments finis, tassement.[Traduit par la Rédaction]

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Section: Causes Of Rollingmentioning

confidence: 98%

Section: Disadvantages Of Double-o-tunnels (Dots)mentioning

confidence: 98%

Section: Disadvantages Of Double-o-tunnels (Dots)mentioning

confidence: 98%

Section: Disadvantages Of Double-o-tunnels (Dots)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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