深圳地铁5号线暗挖段风化花岗岩的组构特征分析  

Feature Analysis on Rock Fabric of Weathered Granite in Undermining Section of Shenzhen Metro Line 5

作　　者：李涛[1] 刘继强 尹文平[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中铁南方投资发展有限公司,广东深圳518055

出　　处：《铁道标准设计》2013年第3期85-89,共5页Railway Standard Design

基　　金：国家自然科学基金项目(编号50878019)

摘　　要：室内采用颗粒分析试验、压汞试验、比表面及孔隙度分析仪、X射线衍射和荧光光谱仪、透射和扫描电子显微镜等多种仪器和方法对取自深圳地铁5号线暗挖段地层的典型风化花岗岩试样进行分析,获得试样的颗粒组成与级配、孔隙组成及分布、化学元素及矿物组成、微观结构特征等信息,同时对这些组构特征与风化花岗岩工程特性的关系作了简要探讨。研究成果有助于深入了解深圳地区风化花岗岩的工程特性及预测和控制地铁隧道开挖时引起的地层变形和地表沉降。By means of the specific surface and porosity analyzer, the X-ray diffractometer, the X-ray fluorescence spectrometer, the transmission electron microscope （TEM）, and with the screen analysis test and the mercury intrusion porosimetry, the weathered granite samples taken from the undermining section of Shenzhen Metro Line 5 were analyzed in laboratory. Thus the granulometric composition and graduation, pore constitution and distribution, chemical elements, mineral contents, microstructure characteristics of the typical specimens were obtained. Afterwards, the relationship between those features of rock fabric obtained and engineering properties of weathered granite was briefly discussed. The research results can help to understand engineering properties of weathered granite in Shenzhen district as well as to predict and control ground deformations and ground settlements induced by the excavation of metro tunnel.

关 键 词：矿物成分 孔径 微观结构 风化花岗岩 工程性质 

分 类 号：TU452[建筑科学—岩土工程]