土木工程外文翻譯---在不良地質(zhì)條件下的隧道掘進(jìn)-建筑結(jié)構(gòu)(已修改)
2025-06-01 14:10 本頁(yè)面
【正文】 西 南 交 通 大 學(xué) 本科畢業(yè)設(shè)計(jì) 外文翻譯 年 級(jí) : 學(xué) 號(hào) : 姓 名 : 專 業(yè) : 指導(dǎo)老師 : 2020 年 6 月 西南交通大學(xué)本科 畢業(yè)設(shè)計(jì) 第 1 頁(yè) TBM TUNNELLING IN DIFFICULT GROUND CONDITION Giovanni Barla and Sebastiano Pelizza ABSTRACT This paper is to discuss TBM tunneling in difficult ground conditions, when problems are met which may reduce dramatically the average progress rates and practical consequences may be such as to pose serious questions on the use of mechanized TBM tunnelling versus drill blast and other socalled traditional excavation methods. Following a few remarks on rock TBM tunnelling in relation to the selection and dimensioning of the machine, the attention is posed on the limiting geological conditions which may be envisaged with respect to the use of TBM tunnelling and on the importance of geological and geotechnical investigations, in order to derive an appropriate understanding of the rock mass conditions along the line of the tunnel. The discussion is centered upon the relatively more important or difficult ground conditions including borability limits, instability of excavation walls, instability of excavation face, fault zones and squeezing. Whenever available to the authors and based on project experience, the point of view is illustrated by case examples, which give the opportunity to underline specific difficulties encountered and remendations. INTRODUCTION TBM excavation represent a big investment in an unflexible but potentially very fast method of excavating and supporting a rock tunnel (Barton, 1996). When unfavorable conditions are encountered without warning, time schedule and practical consequences are often far greater in a TBM driven tunnel than in a drill and blast tunnel. The unfavorable conditions can be produced by either a rock mass of very poor quality causing instability of the tunnel or a rock mass of very quality (. strong and massive rock mass) determining very low peration rates. However, it is to be observed that when using the full face mechanized excavation method, the influence of the rock mass quality on the machine performance has not an absolute value: the 西南交通大學(xué)本科 畢業(yè)設(shè)計(jì) 第 2 頁(yè) influence is in fact to be referred to both the TBM type used and the tunnel diameter. Right from the beginning of its earliest applications, the use of full face mechanized excavation was to overe the limits imposed by local geology, the economic challenges and schedule petitions of the drill and blast method and other socalled traditional excavation methods. A prominent example is given by the recent (from 1995 to 2020) construction of the one tube km long Laerdal Tunnel in
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