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Mechanism of swelling tunnels driven through mudstone

机译:泥岩驱动隧道膨胀的机理

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摘要

The mechanism of so-called swelling tunnels is analytically elucidated, taking advantage of the concept of Critical or Fully-softened State Soil Mechanics and Kastner's classical approach. Case histories are of a railway tunnel and drainage tunnels as countermeasures against landslides driven through mudstone of Shiiya and Teradomari Neogene formations in Niigata Prefecture, typical problem materials in Japan. It is shown that Kastner's approach can be successfully applied for calculating this kind of pressure on a circular tunnel driven through mudstone severely faulted or folded into clay, if shear strength parameters in terms of total and effective stress at fully-softened state are used for short term and long term problems respectively, as has so far been successfully applied in practice for stability analyses of clay slopes and that swelling test is of no use for design purpose.
机译:借助“临界或完全软化的状态土壤力学”和Kastner的经典方法,可以对所谓的膨胀隧道的机理进行分析性地阐明。历史案例是铁路隧道和排水隧道,作为对付日本新泻县Shiiya和Teradomari Neogene地层泥岩驱动的滑坡的对策,这是日本的典型问题材料。结果表明,如果使用在完全软化状态下的总应力和有效应力来表示的短时抗剪强度参数短时,Kastner的方法可以成功地应用于通过严重断裂或折叠成黏土的泥岩驱动的圆形隧道的这种压力计算。迄今已分别在实践中成功应用于粘土斜坡稳定性分析的长期和长期问题,并且溶胀测试对于设计目的没有任何作用。

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