西安科技大学学报2024，Vol.44Issue(6)：1095-1106,12.DOI:10.13800/j.cnki.xakjdxxb.2024.0608
动静组合荷载下隧道锚固围岩累积损伤效应与支护优化
Cumulative damage effect and support optimization of tunnel anchored surrounding rock under coupled dynamic-static loads
摘要
Abstract
Periodic excavation blasting causes the gradual accumulation of damage to the anchored sur-rounding rock of the tunnel,and its plastic zone expands or even becomes unstable,seriously threaten-ing the subsequent safe construction and operation of the tunnel.By establishing a stress model for the anchored surrounding rock unit under coupled dynamic-static loads,based on the principle of coordina-ted deformation between anchor bolts and rocks and the attenuation law of blasting main frequency,the damage deformation mechanism of the anchored surrounding rock under static loads such as in-situ stress,pore water pressure,anchor bolt support force,and dynamic loads of excavation blasting was studied.The calculation formulas for the plastic zone and broken zone radius of the anchored surround-ing rock after the cumulative damage under coupled dynamic-static loads were derived,and the evolu-tion law of deformation range of anchored surrounding rock under different factors was analyzed.The re-sults show that:The deformation range of tunnel anchored surrounding rock under coupled dynamic-static loads gradually increases with the increase of pore water pressure,blasting impact force,number of surrounding blast holes,and damage variables,and decreases with the increase of geological strength indicators;The range of disturbance damage area for the anchored surrounding rock of K85.0～K195.7 section of shangnan tunnel 4#of the west east gas pipeline is 8 m,with the radii of plastic zone and bro-ken zone are 5.08 m and 3.74 m,respectively;After the implementation of the optimized support scheme,the subsidence of the tunnel roof has decreased by 58%,and the relative displacement of the sidewalls has decreased by 60%.The deformation control effect of the surrounding rock is good.The re-search provides reliable guarantees for the safe and efficient construction of the tunnel.关键词
隧道开挖/锚固围岩/动静组合荷载/累积损伤/支护优化Key words
tunnel excavation/anchored surrounding rock/coupled dynamic-static loads/cumulative damage/support optimization分类
建筑与水利引用本文复制引用
于远祥,沈鹏,张永亮,王有发..动静组合荷载下隧道锚固围岩累积损伤效应与支护优化[J].西安科技大学学报,2024,44(6):1095-1106,12.基金项目
国家自然科学基金项目(41702346) （41702346）
