岩土力学2024，Vol.45Issue(8)：2437-2449,13.DOI:10.16285/j.rsm.2023.1451
单面卸载条件下深埋圆形洞室围岩岩爆的试验模拟研究
Experimental simulation of rockburst in the surrounding rock of a deep circular cavern induced by single-side unloading
摘要
Abstract
To further study the occurrence process and mechanism of rockburst induced by excavation of deep caverns,the true triaxial electro-hydraulic servo mutagenesis test system was used to carry out experimental research on granite with strong rockburst tendency and simulated the three-dimensional stress state at a depth of 500 meters.The excavation process near the cavern was simulated by unloading the unilateral load of the surrounding rock,and ultimately inducing rockbursts due to stress redistribution of the surrounding rock.In the experiment,monitoring equipment observed real-time tunnel wall failures.The test results revealed:(1)the rockburst process under single-side unloading can be divided into six stages-stress redistribution post-unloading,preparation period,initial cuttings ejection and spalling,calm period,secondary cuttings ejection and spalling,and severe damage;(2)Rockbursts in the cave wall exhibited distinct temporal and spatial characteristics and asymmetry under unloading influence,with cracks initially appearing at the cave roofs base post-unloading,followed by severe rockbursts on the side opposite the unloading surface,forming a V-shaped trough along the axis during subsequent loading;(3)The defined hysteresis effect coefficient indicated that compared to rockbursts under three-direction loading,single-side unloading-induced rockbursts displayed greater abruptness and were more prone to cavern collapse.To mitigate such rockbursts,support and reinforcement measures should be implemented on the existing cavern side opposite the unloading surface when excavating adjacent caverns.关键词
试验模拟/邻近洞室开挖/岩爆/真三轴试验系统/单面卸载Key words
experimental simulation/adjacent cavern excavation/rockburst/true triaxial test system/single-side unloading分类
土木建筑引用本文复制引用
焉兆熙,刘科伟,杨家彩,郭腾飞,宋锐涛,王培宇..单面卸载条件下深埋圆形洞室围岩岩爆的试验模拟研究[J].岩土力学,2024,45(8):2437-2449,13.基金项目
国家自然科学基金(No.51974360).This work was supported by the National Natural Science Foundation of China(51974360). （No.51974360）
