Classification of Frost Damage Grades in Tunnel
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摘要: 为了给隧道冻害防治提供基本依据,通过分析隧道冻害发生的条件,选取气候和地下水条件作为等级划分的主要因素.在划分气候的寒冷程度和地下水危害程度的基础上,采用综合评判的方法,对隧道冻害等级进行划分.结果表明,气候和地下水条件是影响隧道冻害程度的最主要因素;气候条件选取最冷月平均气温和冻结深度2个控制指标,将隧道所处地区的寒冷程度划分为5级;地下水条件选取赋存与补给形式和渗入隧道情况2个指标,将地下水的危害程度划分为5级;综合考虑气候和地下水条件对隧道冻害程度的影响,将隧道冻害等级划分为5级;全多年冻土隧道的气候条件虽然更加恶劣,但是隧道处于含冰围岩中,常年处于冻结状态,冻害现象并不严重,只是在隧道开挖过程中人为影响或暖季促使围岩融化,冻害等级可划分为Ⅱ级.Abstract: In order to supply basic principles for preventing frost damage in tunnels,through analyzing the conditions of frost damage occurred in tunnels,climate and groundwater were chosen as main influencing factors to grading.On the basis of partition for climate cold level and groundwater harm degree,the classification of frost damage in tunnels is partitioned with a comprehensive evaluation method.The results show that the climate and groundwater are main influencing factors of frost damage;The cold level is partitioned into five grades by the control indicators of climate including the average temperature of the coldest month and the freezing depth;The harm degree of groundwater is partitioned into five grades by the control indicators of groundwater including the form of groundwater occurrence,supplying and the situation of groundwater spreading into tunnel.The classiffication of frost damage in tunnels is divided into five grades according to the influencing factors of climate and groundwater for frost damage levele;In permafrost,although the climate is cold in extreme,frost damage happens less seriously in the tunnels where surrounding rocks are freezing all the year round.The frost damage of permafrost tunnels is classified as grade Ⅱ while the ice on the surrounding rocks melts by the impacting of human activities in excavation or warming.
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Keywords:
- tunnelling /
- frost damage /
- comprehensive evaluation
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