采矿与岩层控制工程学报2026，Vol.8Issue(4)：276-292,17.DOI:10.13532/j.jmsce.cn10-1638/td.2025-1265
节理岩体隧道关键块体空间展布特征与靶向支护研究
Spatial distribution and targeted support of key blocks in jointed rock mass tunnels
摘要
Abstract
The variability in the scale and spatial configuration of structural planes introduces uncertainty,which poses significant challenges to the prevention and control of key block collapses and the optimization of targeted support design for tunnels.In this study,we developed a three-dimensional extension algorithm for structural planes based on two-dimensional trace features extracted from sequential tunnel face images.This algorithm was integrated with multi-scale modeling to establish an equivalent rock mass model retaining only the large-scale controlling structural planes.By conducting a comprehensive analysis on the spatial interactions between key blocks and tunnel faces and using a block-search algorithm,the geometric characteristics of surrounding key blocks were identified.Subsequently,probabilistic models describing block height and volume distributions of these blocks were constructed,and their spatial patterns—including size and shape—were illustrated through rose diagrams.Taking the Fanshishan Tunnel on the Dongliang Expressway in Shandong Province as a case study and considering its specific structural plane characteristics,a targeted rock-bolt support scheme considering key block stability was proposed and compared with conventional support.The comparison reveals that the targeted support reduces the maximum surrounding rock displacement to 26.96 mm and lowers the peak axial force of the rock bolts by approximately 34%.These findings demonstrate that targeted support effectively mitigates local deformation and lowers the peak axial force induced by key block instability,thereby enhancing tunnel stability and optimizing support resource allocation.The proposed scheme provides a theoretical foundation and practical engineering reference for stability analysis and support design in structurally controlled jointed rock mass tunnels.关键词
节理岩体/关键块体/空间展布特征/靶向支护/数值模拟Key words
jointed rock mass/key block/spatial distribution characteristics/targeted support/numerical simulation分类
交通工程引用本文复制引用
贺鹏,张盼盼,安婕,王菲,王刚,姜慧君..节理岩体隧道关键块体空间展布特征与靶向支护研究[J].采矿与岩层控制工程学报,2026,8(4):276-292,17.基金项目
国家自然科学基金资助项目(52079077) （52079077）
