一种大跨度地下洞室群经验设计系统及其应用  

An empirical design system for large underground caverns and its application

作　　者：张春生 褚卫江 吴家耀 陈建林 朱永生 曹爱武 孟国涛 ZHANG Chunsheng;CHU Weijiang;WU Jiayao;CHEN Jianlin;ZHU Yongsheng;CAO Aiwu;MENG Guotao(PowerChina Huadong Engineering Corporation,Hangzhou,Zhejiang 311122,China;HydroChina Itasca R&D Center,Hangzhou,Zhejiang 311122,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [2]浙江中科依泰斯卡岩石工程研发有限公司,浙江杭州311122

出　　处：《岩石力学与工程学报》2023年第12期2861-2875,共15页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(U1865203)。

摘　　要：岩体中大跨度地下洞室群支护设计是一个涉及地质条件、岩石力学、洞室形状、开挖方法等诸多因素影响的复杂非线性难题。为解决Q系统、RMR、设计规范等已有地下洞室设计系统在岩体强度、地应力、洞室几何特征等方面考虑的不足,提出一个包含岩体质量、岩体峰值强度、岩体残余强度、地应力、洞型特征和开挖施工方法6个因素全新的地下洞室设计指标D,并分别建立6个因素的定量评分表格,提出基于D值的地下洞室支护压力、洞室群岩柱厚度的经验设计公式,构建基于D值和洞室跨度确定地下洞室支护类型组合、锚杆、锚索、喷层等支护结构详细参数的设计系统,实现对地下洞室支护方案和参数的定量设计,并以国内外45个水电工程地下洞室支护设计、洞室群岩柱厚度设计为例对该经验设计系统进行验证,该系统可以作为指导地下洞室或洞室群设计的通用经验系统。The support design of large underground caverns is a complicated non-linear issue that is related to geology,rock mechanics,cavern geometry,excavation method,etc.In order to solve the shortcomings of the empirical support design system,such as Q,RMR,design code,etc.,which are lack of consideration for the influence of the strength of the rock mass,the geo-stress and the cavern geometry characteristics,a new comprehensive index D is proposed,which is including,rock mass quality,peak strength and residual strength of the rock mass,geo-stress,cavern geometry,and the excavation method.The scoring table for each factor is proposed.A new function for evaluating support pressure and determining the thickness of rock pillars for adjacent cavern complexes,is created based on D and the span of caverns.Detail recommendations for support design include various combinations of shotcrete,rock bolts,prestressed anchor cables,steel ribs and concrete lining,and the suggestion for the spacing and length of rock bolts or prestressed anchor cables,the requisite thickness of the shotcrete,and the locked force of prestress anchor cables is also proposed.This new design system is verified using more than 45 large underground caverns of different hydroelectric power projects worldwide.This design system can be used as a general empirical system to guide the design of underground cavern or cavern group.

关 键 词：岩石力学 地下洞室 大跨度 设计系统 岩体质量 峰值强度 残余强度 支护压力 锚杆 锚索 喷层 

分 类 号：TU45[建筑科学—岩土工程]