砂化白云岩隧洞围岩分类方法SHF构建及应用  

Structure and Application of SHF Classification Method for Surrounding Rock of Sandy Dolomite Tunnel

作　　者：董家兴[1] 龚欣月 米健 范开元 杨润学 赵永川 沐红元 周伦顺 Dong Jiaxing;Gong Xinyue;Mi Jian;Fan Kaiyuan;Yang Runxue;Zhao Yongchuan;Mu Hongyuan;Zhou Lunshun(Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Institute of Water&Hydropower Engineering Investigation,Design and Research,Kunming 650021,China;Central Yunnan Water Diversion Construction Administration Bureau,Kunming 650000,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]云南省水利水电勘测设计研究院,云南昆明650021 [3]云南省滇中引水工程有限公司,云南昆明650000

出　　处：《地球科学》2024年第8期2813-2825,共13页Earth Science

基　　金：国家自然科学基金资助项目(No.42162026);云南省重大科技专项计划(No.202002AF080003);云南省应用基础研究计划(No.202201AT070083)。

摘　　要：砂化白云岩在我国西南地区分布广泛,在该地层中修建隧洞,常出现掌子面塌方、突水涌砂等地质灾害,因此在滇中引水工程建设中面临的砂化白云岩问题备受关注.砂化等级和地下水条件是控制砂化白云岩隧洞围岩破坏模式与稳定性的关键因素,然而,在传统围岩分类方法中往往没有全面考虑到这些因素,例如在Q系统中未考虑岩石强度、RMR法未考虑地应力、BQ法对砂化白云岩的结构面状态、粗糙度等,同时,传统方法均未直接考虑砂化等级对于砂化白云岩工程特性的影响.为实现更为快速、客观地进行砂化白云岩隧洞围岩分类,需构建一种适合于砂化白云岩隧洞的围岩分类方法.为解决以上缺陷,以在建的滇中引水工程为依托,首先分析了Q法、RMR法、RMi法、GSI法、BQ法等传统方法在砂化白云岩隧洞中的适用性.其次,结合砂化白云岩工程地质特性及赋存地质环境,构建了以砂化等级、结构面状态、地下水、主要结构面状态、地应力为评价指标的围岩分类体系SHF,并选取依托工程典型洞段对SHF分类方法进行了验证和应用.建立的砂化白云岩隧洞围岩分类方法SHF易于操作,应用该方法所得的围岩分类结果更符合工程实际,研究可为砂化白云岩隧洞支护设计和施工提供理论依据.Sandy dolomite is widely distributed in the southwest of China.When tunnels are built in this stratum,geological disasters such as face collapse,water inrush and sand gushing often occur.Therefore,the problem of sandy dolomite faced in the construction of water diversion project in central Yunnan has attracted much attention.The sanding grade and groundwater conditions are the key factors to control the failure mode and stability of the surrounding rock of the sanded dolomite tunnel.However,these factors are often not fully considered in the traditional surrounding rock classification methods,such as the rock strength is not considered in the Q system,the ground stress is not considered in the RMR method,and the joint state and roughness of the sandy dolomite are not considered in the BQ method.Totally,these classification methods do not take into account the influence of sanding grade.In order to make the surrounding rock classification results of the sandy dolomite tunnel more accurate and faster,it is necessary to build a classification method suitable for the sandy dolomite tunnel.Based on the water diversion project in central Yunnan under construction,we analyze the applicability of traditional methods such as Q method,RMR method,RMi method,GSI method and BQ method in sandy dolomite tunnel.Secondly,combined with the engineering characteristics of sandy dolomite and the external environmental factors,the surrounding rock classification system SHF with the evaluation indexes of sanding grade,structural plane state,groundwater,main structural plane state and ground stress is constructed,and the SHF classification method is verified and applied by selected typical tunnel sections of the project.The established classification method SHF for surrounding rock of sandy dolomite tunnel is prone to operate and highly consistent with the actual situation of the project.The research can provide a theoretical basis for the design and construction of sanded dolomite tunnel support.

关 键 词：砂化白云岩 SHF围岩分类方法 砂化等级 地下水 滇中引水工程 

分 类 号：P642[天文地球—工程地质学]