节理组合围岩失稳机理分析及塌方风险管控建议  

Instability Mechanism Analysis of Jointed Surrounding Rock and Suggestions on Collapse Risk Control

作　　者：费伦林 江炜 杨晓秋 FEI Lunlin;JIANG Wei;YANG Xiaoqiu(Jiangxi Highway Investment Group Co.,Ltd.,Nanchang,Jiangxi 330003,China;Shanghai Tongyan Civil Engineering Technology Co.,Ltd.,Shanghai 200092,China;Shanghai Engineering Research Center of Underground Infrastructure Detection and Maintenance Equipment,Shanghai 200092,China)

机构地区：[1]江西交通投资集团有限责任公司,江西南昌330003 [2]上海同岩土木工程科技股份有限公司,上海200092 [3]上海地下基础设施安全检测与养护装备工程技术研究中心,上海200092

出　　处：《施工技术(中英文)》2025年第7期144-150,共7页Construction Technology

基　　金：江西省交通运输厅科技项目(2020C003)。

摘　　要：在节理岩体中修建隧道,围岩稳定性与节理组合条件密切相关。为深入理解隧道开挖时围岩稳定性与节理特征间的关系,依托赣南地区在建的武功山、龙南西等隧道工程,借助离散元仿真分析手段建立不同节理倾角组合计算模型,以塌方区域、塌方部位、洞周围岩剪应力分布为研究对象,重点研究不同节理倾角组合下围岩可能发生的失稳风险及失稳机理,总结失稳模式和塌方面积,针对性提出对应的风险管控措施。通过研究得到以下结论:两组节理组合工况下,围岩失稳情况可分为4种模式,即弯折破坏型、顺层滑移型、拱顶塌落型、垂直塌落型;塌方风险的发生、发生部位及范围受节理倾角控制,0°/90°倾角组合对围岩稳定性影响最大,其次是对称型节理组合;非线性拟合能够较好地对塌方面积进行预测;锚杆应针对可能的失稳部位进行布设,布设角度应尽可能与节理组大角度相交,重点覆盖塌方范围及节理张开区域。研究结果显示节理倾角组合围岩失稳可总结为固定4种模式,且受节理倾角特征控制。In the construction of a tunnel in a jointed rock mass,the stability of the surrounding rocks is closely related to the joint combination conditions.To deeply understand the relationship between the stability of surrounding rocks and joint characteristics during tunnel excavation,based on the Wugongshan and Longnanxi Tunnel Projects under construction in Ganzhou City,Jiangxi Province,the calculation models of different joint inclination angles are established by means of discrete element simulation analysis.Taking the shear stress distributions of collapse area,collapse site,and surrounding rock as the research objects,the possible instability risk and instability mechanism of surrounding rocks under different joint inclination angles were studied,the instability modes and collapse areas were summarized,and the corresponding risk control measures were proposed.The following conclusions are obtained through the research that under the combined conditions of two groups of joints,the instability of surrounding rocks can be divided into four modes,namely,bending failure mode,bedding slip mode,vault collapse mode,and vertical collapse mode.The occurrence,location,and range of collapse risk are controlled by joint inclination angle.The 0°/90°inclination angle combination has the greatest influence on the stability of surrounding rocks,followed by the symmetrical joint combination.Nonlinear fitting can better predict the collapse area.The bolts should be arranged for the possible instability parts,and the layout angle should intersect with the large angle of the joint group as much as possible,focusing on the scope of the collapse and the joint opening area.The results indicate that the instability of surrounding rocks with joint inclination can be summarized into four fixed modes,which are controlled by the characteristics of joint inclination.

关 键 词：隧道 围岩 失稳模式 数值模拟 锚杆 加固 风险 

分 类 号：U455[建筑科学—桥梁与隧道工程]