理论研究 2024年 第53卷 第21期

DOI: 10. 7672 / sgjs2024210090

岩石质量指标对隧道稳定性的影响研究

宋鹏飞¹’²,张程¹,李智¹,刘广¹,熊斌¹,范兵³,周应权³,蒋金宏³

作者简介:

宋鹏飞,高级工程师,E⁃mail:1161407609@ qq. com

作者单位:

1.中建隧道建设有限公司,重庆 401320; 2.重庆大学土木工程学院,重庆 400045;3.重庆市江南城市建设发展(集团)有限公司,重庆 400000

基金项目:

∗中建五局重点课题:钻爆法隧道喷射混凝土降耗及变断面快速施工关键技术研究与应用(cscec5b⁃2022⁃28)

摘要:

为研究岩石质量指标(RQD)变化对隧道稳定性的影响,依托江南隧道工程,采用数值模拟计算方法,分析了隧道发生岩爆时不同 RQD 值和节理倾角下围岩环向应力、动能及最大速度变化规律。研究结果表明,不同 RQD值和节理倾角下,初始地应力为 75MPa 时的围岩环向应力峰值、最大动能均较初始地应力为 55MPa 时大;围岩破坏程度随着节理倾角的增大而增大;围岩动能基本随着 RQD 值的增大逐渐减小,随着地应力的增大逐渐增大;当初始地应力为 55,75MPa 时,围岩最大速度在 RQD 值为 62,72,82 时存在极值,在 RQD 值为 92 时存在最小值。

English:

In order to study the influence of rock quality designation (RQD) on tunnel stability, basedon the Jiangnan Tunnel project, numerical simulation calculation methods were used to analyze thecircumferential stress, kinetic energy and maximum velocity of surrounding rock under different RQDvalues and joint dip angles during rock burst in the tunnel. The research results show that under differentRQD values and joint dip angles, the peak circumferential stress and maximum kinetic energy ofsurrounding rock at an initial geostress of 75MPa are higher than those at an initial geostress of 55MPa.The degree of surrounding rock damage increases with the increase of joint dip angles. The kinetic energyof surrounding rock gradually decreases with the increase of RQD values and increases with the increaseof geostress. When the initial geostress is 55,75MPa, the maximum velocity of the surrounding rock hasextreme values at RQD values of 62,72,82, and a minimum value at RQD value of 92.