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Mechanized tunnelling in hydrothermally altered grounds: The effect of hydrothermal fluids on the rock behaviour in the central Iran
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.tust.2020.103340
Arash Hashemnejad , Seyed Mahmoud Fatemi Aghda , Mehdi Talkhablou

Abstract The Kerman tunnel is located in the southeast of Urmia-Dokhtar Magmatic Arc (UDMA) in central Iran that is known as the Kerman Cenozoic Magmatic Arc (KCMA). This arc is one of the most important altered areas in Iran, which has caused significant physical and mechanical variations in characteristics of rocks. The relationship between the type of hydrothermal alteration and rock properties is considerably variable depending on several factors including the parent rock, PT-conditions, chemical composition, and fluid type, as well as the period of fluid-rock interaction. Studies showed that high-temperature fluids increase consolidation and strength by decreasing porosity and permeability of rocks in the area while the mechanism of alteration by low-temperature subsurface fluids is more complicated resulting in various properties. The most important effects are the decrease in density, strength, and elastic modulus. In Kerman tunnel, these variations in the rock properties led to unexpected behavior of rocks and hazards such as (1) water inrush in some parts of the tunnel where the RQD value is high, and Lugeon value is low, (2) wearing of disc cutters in low or non-abrasive lithologies, (3) intense and mainly unexpected variations in penetration rate, which show considerable influence of the alterations in the area. These are some unknown mechanisms during the tunnel boring in the area. In this study, it is tried to detect these mechanisms and determine the risks of mechanized tunnelling in hydrothermally altered grounds.

中文翻译:

热液蚀变地层中的机械化隧道:热液流体对伊朗中部岩石行为的影响

摘要 克尔曼隧道位于伊朗中部乌尔米亚-多赫塔尔岩浆弧(UDMA)东南部,被称为克尔曼新生代岩浆弧(KCMA)。该弧是伊朗最重要的蚀变区之一,导致岩石物理和机械特性发生显着变化。热液蚀变类型与岩石性质之间的关系受母岩、PT 条件、化学成分和流体类型以及流体-岩石相互作用周期等多种因素影响很大。研究表明,高温流体通过降低该地区岩石的孔隙度和渗透率来增加固结和强度,而低温地下流体的蚀变机制更加复杂,从而导致各种性质。最重要的影响是密度、强度和弹性模量的降低。在 Kerman 隧道中,岩石特性的这些变化导致了意想不到的岩石行为和危害,例如 (1) 隧道某些 RQD 值高、Lugeon 值低的部分突水,(2) 圆盘磨损低或非磨蚀性岩性中的切削齿,(3) 穿透率的剧烈且主要是意想不到的变化,这表明该地区的蚀变有相当大的影响。这些是该地区隧道掘进过程中的一些未知机制。在这项研究中,试图检测这些机制并确定在热液蚀变地面机械化隧道开挖的风险。岩石特性的这些变化导致了岩石的意外行为和危险,例如 (1) 在 RQD 值高且 Lugeon 值低的隧道某些部分发生突水,(2) 在低或非磨蚀性岩性,(3) 穿透率的强烈且主要是出乎意料的变化,这表明该地区的蚀变有相当大的影响。这些是该地区隧道掘进过程中的一些未知机制。在这项研究中,试图检测这些机制并确定在热液蚀变地面机械化隧道开挖的风险。岩石特性的这些变化导致了岩石的意外行为和危险,例如 (1) 在 RQD 值高且 Lugeon 值低的隧道某些部分出现突水,(2) 在低或非磨蚀性岩性,(3) 穿透率的强烈且主要是出乎意料的变化,这表明该地区的蚀变有相当大的影响。这些是该地区隧道掘进过程中的一些未知机制。在这项研究中,试图检测这些机制并确定在热液蚀变地面机械化隧道开挖的风险。(3) 渗透率的剧烈且主要是出乎意料的变化,这表明该地区的变化有相当大的影响。这些是该地区隧道掘进过程中的一些未知机制。在这项研究中,试图检测这些机制并确定在热液蚀变地面机械化隧道开挖的风险。(3) 渗透率的剧烈且主要是出乎意料的变化,这表明该地区的变化有相当大的影响。这些是该地区隧道掘进过程中的一些未知机制。在这项研究中,试图检测这些机制并确定在热液蚀变地面机械化隧道开挖的风险。
更新日期:2020-05-01
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