1.Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China 2.Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China
Abstract：The NW Yunnan area is one of the famous tectonic-metallogenic regions in southwestern China,and a series of engineering problems always occur because of the existence of altered rocks formed by hydrothermal action.It was shown by field investigation and lab tests that the types of altered rocks were mostly those of montmorillonitization,and the altered clay mineral was mainly pure montmorillanite,which rendered the altered rock both soft and expansive.The altered rocks had a similar development with the hydrothermal ore deposits in the area of three paralleled rivers.Taking examples from the NW Yunnan area along the Yunnan-Tibet Railway line,the geological characteristics and engineering properties of the altered rocks were discussed,and a series of control measures were put forward for the engineering problems caused by them.
张永双；曲永新；刘景儒；郭长宝；. 滇藏铁路滇西北段蒙脱石化蚀变岩的工程地质研究[J]. 岩土工程学报, 2007, 29(4): 531-536.
ZHANG Yongshuang 1, QU Yongxin 2, LIU Jingru 1, GUO Changbao 1. Engineering geological research on altered rocks in the area of NW Yunnan along Yunnan-Tibet Railway line. Chinese J. Geot. Eng., 2007, 29(4): 531-536.
