Engineering geological properties of altered rocks and implications for railway construction in the Sanjiang orogenic belt, Southwest China

被引：1
|
作者：
Yongshuang Zhang
Changbao Guo
Yongxin Qu
Yuhuan Song
机构：
[1] Chinese Academy of Geological Sciences,Institute of Geomechanics
[2] Chinese Academy of Sciences,Institute of Geology and Geophysics
来源：
Bulletin of Engineering Geology and the Environment | 2011年 / 70卷
关键词：
Montmorillonitization; Altered rock; Swelling; Hydrothermal action; Yunnan-Tibet railway; Transformation en montmorillonite; Roche altérée; Action hydrothermale; Ligne de chemin de fer Yunnan-Tibet;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The Yunnan-Tibet Railway, currently under construction, crosses five altered rock zones in the Sanjiang orogenic belt, southwestern China. They are mainly montmorillonitized rock zones formed by hydrothermal alteration. Based on field investigation and laboratory tests, this paper presents the geological characteristics and engineering properties of the altered rocks encountered during the construction of the railway. Being characterized by a high montmorillonite content, high degree of alteration, high physico-chemical activity and high swelling potential, these rocks always lead to engineering geological problems. The concept of “alteration coefficient” is put forward; the greater the alteration coefficient, the higher the alteration degree and swelling potential. Countermeasures are proposed to tackle the engineering problems during tunnel construction caused by the altered rock.
引用
收藏
页码：143 / 152
页数：9
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