云南地区铁路隧道地质勘察技术探讨-《高速铁路技术》

文章信息/Info

Author(s):: CHEN Wei; DU Yuben; JIANG Liangwen; 1. Southwest Jiaotong University, Chengdu 610031, China;
2. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: Yunnan region|railway tunnel|geological investigation|surrounding rock|geophysical exploration|large deformation

摘要:: 本文通过对云南地区在建和已建成的10条铁路隧道施工后围岩级别的统计分析，总结了云南地区铁路隧道围岩的分布特征：施工后，隧道围岩级别占比中Ⅳ、Ⅴ级围岩比例高，Ⅳ、Ⅴ级围岩比例与软质岩占比之间接近正比关系；以小江断裂~弥勒-师宗断裂一带为界的东西方向及三江并流区域向南东的横断山区南延段的南北地理方向上，围岩级别比例受地质构造影响严重程度不均，隧道围岩级别的占比与区域断裂走向密切相关。并对云南地区铁路隧道地质勘察周期、隧道围岩与工程投资的相互关系、隧道围岩的修正、隧道物探正常场的钻探验证、围岩初始地应力的评价与大变形的确定等进行了技术探讨，以期为该地区后续铁路项目的隧道建设提供参考。

Abstract:: Based on the statistical analysis of the surrounding rock grades of 10 railway tunnels under construction and completed in Yunnan, this paper summarizes the distribution characteristics of the surrounding rock of railway tunnels in Yunnan:After the construction, there is a high proportion of tunnel surrounding rock of Grade Ⅳ and Ⅴ, which is nearly proportional to the proportion of soft rock. In the east-west direction bounded by Xiaojiang Fault-Mile-Shizong Fault and in the south-north geographical direction from the Three Parallel Rivers of Yunnan Protected Areas to the south extension of Hengduan Mountains in the southeast, the degree of influence of geological structure on the surrounding rock grade ratio is uneven. The proportion of tunnel surrounding rock grades is closely related to the regional fault strike. The paper also made technical discussion on the geological investigation period of railway tunnels in Yunnan, the relationship between tunnel surrounding rock and project investment, the correction of tunnel surrounding rock, the drilling verification of normal fields of tunnel geophysical exploration, the evaluation of initial in-situ stress of surrounding rock, and the determination of large deformation, so as to provide a reference for tunnel construction of subsequent railway projects in this area.