南水北调与水利科技（中英文）2023，Vol.21Issue(6)：1165-1173,9.DOI:10.13476/j.cnki.nsbdqk.2023.0115
引汉济渭工程秦岭引水隧洞岩爆三维NPR支护技术
Three-dimensional NPR support technology for rockburst in the Qinling diversion tunnel of the Hanjiang-to-Weihe River Water Diversion Project
摘要
Abstract
The Hanjiang-to-Weihe River Water Diversion Project area has more tectonic development such as folds and ruptures,and a series of long joints and joint-intensive zones have been developed in the area,which are generally low in the north and high in the south,with gullies and ravines,so rockburst disasters and damage to the original support structure are frequently generated in this section.Therefore,the study on the water diversion project geological survey,analysis of the tunnel surrounding rock explosion damage characteristics and damage patterns is necessary to carry out ultra-deep tunnel rock explosion three-dimensional NPR high-stress compensation support system for early warning and prevention of rock explosion disaster. Using on-site investigation and other methods,the geological conditions of the tunnel and the causes of rockburst damage were analyzed,and comparative testing was carried out to design a rockburst monitoring and early warning test scheme for the northern section of the project area,and a three-dimensional NPR high-stress compensatory support system with the microscopic NPR anchors as the core was put forward.The degree of rockburst control of the surrounding rocks under the new support system and its support effect were analyzed through on-site testing. Field test results show that the three-dimensional NPR high-stress compensation support system with microscopic NPR anchors as the core can force the excavated surrounding rock in the north section of the tunnel to return to the three-dimensional stress state from the two-dimensional stress state employing high constant resistance stress compensation.The use of good mechanical properties of microscopic NPR anchors on the surrounding rock with high constant resistance,and fast pre-tensioning of timely active support,resulting in the application of microscopic NPR anchors in the research section of the micro-seismic energy,frequency are significantly reduced,the number and depth of the burst crater is significantly reduced,the surrounding rock is in a stable state,and the effect of the support and rock explosion control is remarkable. Through on-site exploration and related experiments,it can be seen that the north section of the project area is a super-deep tunnel with complex geological conditions,which is affected by the tectonic stress,and the rock in the area is prone to stress concentration and rockburst phenomena,such as spalling,ejecting,and throwing.The use of traditional small deformation anchors and multi-layer steel arch rigid primary support systems can not effectively prevent the rock explosion disaster,resulting in the frequent occurrence of rock explosions.Based on the theory of excavation stress compensation,put forward to the microscopic NPR anchors as the core of the three-dimensional NPR high-stress compensation support system,combined with on-site monitoring data analysis,the project section of the monitoring and early warning test section in the application of microscopic NPR anchors,micro-earthquake energy,frequency is significantly reduced.The integrity of the surrounding rock improves the depth of the explosion pit,the steel arch frame force and deformation are reduced,the rock explosion disaster has been effectively controlled,and the support effect is remarkable.关键词
引汉济渭工程秦岭引水隧洞/监测预警/岩爆/微观NPR锚杆/对比试验/支护体系Key words
Qinling diversion tunnel of the Hanjiang-to-Weihe River Water Diversion Project/monitoring and warning/rockburst/micro NPR anchor/comparative test/support system分类
交通工程引用本文复制引用
陶志刚,赵军政,胡杰,孙滢滢,何满潮..引汉济渭工程秦岭引水隧洞岩爆三维NPR支护技术[J].南水北调与水利科技（中英文）,2023,21(6):1165-1173,9.基金项目
深部岩土力学与地下工程国家重点实验室开放基金课题(SKLGDUEK2217) （SKLGDUEK2217）
浙江省山体地质灾害防治协同创新中心开放研究基金项目(PCMGH-2022-03) （PCMGH-2022-03）
