原状软碎岩体室内被动三轴变形特性研究

岩体变形特征是水利水电工程建设中最重要的参数之一,其可以合理地评价岩体的工程特性,并且科学地获取岩体的变形参数,是岩体稳定性分析、水工支护设计和工程地质定量评价的核心内容。岩石三轴压缩强度是岩石物理力学性质之一,系指岩石试件在三向压应力作用下所能抵抗的最大轴向应力。本次研究依托固增水电站引水隧洞工程,采集典型软碎岩体试样,通过室内试验对岩体的被动三轴变形特性展开研究,对变形参数进行分析,获得了岩体分级加载应力和变形参数之间的关系,进而对其工程特性进行了系统的评价,为地下工程支护设计提供了相对可靠的设计参数。

Laboratory Study on Passive Triaxial Deformation Characteristics of Undisturbed Soft Fractured Rock Mass

Deformation characteristics of rock mass,which can reasonably assess the deformation parameters and scientifically obtain the deformation parameters of rock,is one of the most important parameters in water conservancy and hydropower engineering,and it is also the core content of rock mass stability analysis,hydraulic support design and quantitative evaluation of engineering geology.The triaxial compressive strength is one of the physicomechanical properties of rock mass,which refers to the maximum axial stress that rock specimen can resist under triaxial compressive stress.This paper studies the passive triaxial deformation characteristics of typical soft fractured rock samples from the diversion tunnel of Guzeng Hydropower Station through laboratory tests,analyses the deformation parameters,obtains the correlation between grading loading stress and deformation parameters of rock mass,systematically evaluates the engineering characteristics,and finally provides relatively reliable parameters for the design of underground support engineering.