石太客运专线膏溶角砾岩的分类

Classification of Gypsum Karst Breccia for Shijiazhuang-Taiyuan Passenger Dedicated Line

研究目的:膏溶角砾岩类似"软岩硬土",具有物质成分复杂和强度差异大等特性,掌握这种岩石的种类划分,有利于指导工程地质勘察,深入了解其工程特性。研究结论:通过分析研究认为:膏溶角砾岩有固定层位,分布于奥陶系中统每组的第一段;多数为极软岩,强度差异大。按胶结程度的不同,膏溶角砾岩可分为微胶结、弱胶结、较强胶结和强胶结4种;根据颗粒组成、物质成分、成生环境和胶结程度等特征,本文将膏溶角砾岩分为块石状、泥包石状、含砾和硬土状四大类,应加强对奥陶系峰峰组的工程地质勘察工作。

Research purposes： The Gypsum karst breccia seems like soft rock and hard soil with the eharaeteristies of the eomplieated material components and great differences in strength. Knowing the classification of such rock is helpful to instruction of engineering geological survey and deep understanding the engineering eharaeteristies. Research conclusions：Through researching, it is understood that Gypsum karst breccia has specific horizon, locating at the first segment in each formation of the medium series of Ordovieian System. Most of it is special flexible roek with great differences in strength. According to the difference of cementation, gypsum karst breccia is classified as slight cementation, weak cementation, moderate cementation, strong cementation. According to the grain composition, the material component, its forming environment and the cemented degree, the gypsum karst breeeia can be divided of four kinds： the boulder shape, stone coated by mud shape, shape with the gravel and the hard soil shape. The engineering geological survey should be strengthened for Fengfeng Fm of Ordovieian system.