摘要
本文通过室内试验方法,研究成兰铁路(跃龙门隧道至松潘隧道区间)千枚岩隧道围岩工程地质特性。千枚岩隧道围岩抗压强度不同于规范软岩定义要求,含碳质石英比例较高的碳质千枚岩、石英千枚岩抗压强度不低,达到或接近硬岩的标准。绢云母千枚岩抗压强度则低于软岩定义的强度下限。强度与加载方位角和变质程度有关,且表现显著的各向异性。强度等工程力学参数随线路方向呈不同的分布规律。实验成果对研究成兰铁路软岩隧道大变形机制、建立大变形分级和预报体系等提供重要的地质依据。
Through the laboratory test,the engineering geology properties of phyllite tunnel surrounding rock in Chengdu-lanzhou(Yue Longmen tunnel to Songpan tunnel) railway is discussed. The compression strength of phyllite tunnel surrounding rock is different from the requirements of soft rock definition standard.The compressive strength of carbonaceous phyllite and quartz phyllite whose degree of metamorphismis is higher is not low, what is near the hard rock standards.The compressive strength of sericite phylliteis is lower than the minimum of the soft rock definition.The strength is closely related with the loading orientation angle and the degree of metamorphism, what show the significant anisotropy.The engineering mechanical parameters such as strength is different distribution law along with the line route.The experimental results provide important geological basis for the large deformation mechanism of soft rock tunnel in Chengdulanzhou railway and establishing large deformation classification and forecasting system for research.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第S1期398-402,共5页
China Civil Engineering Journal
基金
铁道部自然科学基金项目资助(2010G018-G-1)
关键词
成兰铁路
千枚岩
室内实验
基本特性
各向异性
Chengdu-Lanzhou railway
phyllite
laboratory test
basic characteristics
anisotropy
