摘要
借助与程控装置配套的 CT 技术,研究了青藏高原风火山隧道拱顶和侧拱处的砂质泥岩在冻融循环条件下的损伤扩展特性,并讨论了该条件下引发损伤的主要因素。此结果可为寒区隧道及类似工程的安全运营提供参考,也可为相关的数值模拟计算提供基础。
By the computerized tomography(CT) technology,the properties of damage propagation of sandy mudstone,on top and waist of Fenghuo Shan tunnel in Tibetan plateau,are studied under the freeze-thaw cycle condition. The results show that water migration and volumetric expansion 9% are the main factors resulting in the freeze-thaw damage of sandy mudstone,and the extent and range of damages are varied with the amount of water. In other words,the damage propagation is rather fast in the first 6 cycles,and then almost keeps constant with a little water-supply or none. But under the condition of large water supply,the damage is always developing. Whatever condition the rock sample is in,the side region is damaged more easily and severely than the others. Moreover,during freeze-thaw disturbance of loading and unloading,moderate weathering of sandy mudstone providing passage for the water migration and vast water supply increase the speed of damage. This indicates that the stability of soft-rock regions with many joints or cracks is not favorable,when the rock is penetrated by enough water in freeze-thaw process.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第24期4105-4111,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家杰出青年科学基金(40225001)
国家自然科学基金(40171019)资助课题。
关键词
隧道工程
CT技术
砂质泥岩
冻融循环
损伤
tunneling engineering,CT technology,sandy mudstone,freeze-thaw cycle,damage
