Q系统在那苏瓦水电站围岩分类及支护中的应用

Application of Q-system in Rock Mass Classification and Surrounding Rock Support in Rasuwagadhi Hydropower Project

海外水电项目地下隧洞及洞室围岩支护设计多采用Q系统,其围岩分类方法及支护参数不同于国内勘察规范、水工隧洞设计规范和锚喷支护设计规范所述。为应对海外工程项目技术需求,在对最新版的Q系统支护图进行了详细的说明的基础上,对Q值与围岩分类的对应关系进行了探讨,对应用Q系统进行围岩支护参数确定的过程进行了详细的说明。并成功应用于尼泊尔那苏瓦水电站地下洞室围岩分类和支护设计,设计成果获得国外咨询方的认可,可为海外项目类似工程提供经验参考。

Q-system has been widely used for classification of the rock mass around an underground opening and support design in overseas hydropower projects.The rock mass classification and support design of Q-system are different from those methods described in the Chinese Code for Investigation of Geotechnical Engineering,Specification for design of hydraulic tunnel and Specification for bolt-shotcrete support.In order to meet the technical requirements of overseas projects,on the basis of explaining the latest Q-system support diagram,the corresponding relationship between Q-value and surrounding rock classification is discussed,and the process of determining rock support parameters by Q-system is explained in detail.It has been successfully applied to the rock mass classification and support design of the underground opening in Nepal Rasuwagadhi Hydropower Project.The design results have been approved by foreign consultants and can provide reference for similar overseas projects.