一种大跨度地下洞室群经验设计系统及其应用

doi:10.13722/j.cnki.jrme.2023.0163

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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。

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	张春生1
	褚卫江1
	2
	吴家耀1
	2
	陈建林1
	朱永生1
	2
	曹爱武1
	2
	孟国涛1
	2

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

Abstract：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.

Key words： rock mechanics underground caverns large span design system rock mass quality peak strength residual strength support pressure rock bolts pre-stressed anchor cables shotcrete

引用本文:

张春生1，褚卫江1，2，吴家耀1，2，陈建林1，朱永生1，2，曹爱武1，2，孟国涛1，2. 一种大跨度地下洞室群经验设计系统及其应用[J]. 岩石力学与工程学报, 2023, 42(12): 2861-2875.
ZHANG Chunsheng1，CHU Weijiang1，2，WU Jiayao1，2，CHEN Jianlin1，ZHU Yongsheng1，2，CAO Aiwu1，2，MENG Guotao1，2. An empirical design system for large underground caverns and its application. , 2023, 42(12): 2861-2875.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0163 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I12/2861

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