【摘要】 为探索围岩体在隧道掘进机掘进过程中的围岩扰动特征，该研究基于DXL隧道工程，采用相似模型试验，研究在双向等压条件下，随着TBM掌子面前移，围岩体在45°、90°及180°处，掌子面前方和后方的围岩空间径向位移释放特征及环向应变能的累积变化特征。研究表明：TBM隧道开挖过程中，监测面径向位移释放率及环向应变能聚集增量均可划分为前、中及后期三个阶段，其中，中期围岩径向位移释放量占总体65.0%,环向应变能变化占总体的74.1%,是洞体位移释放率及环向应变能变化最为剧烈的阶段；TBM在双向等压条件下的开挖过程中，隧洞围岩环向应变能形成不同的强度累积区域，可划分为高、次高、中及低四个界限范围，其中1.5R以内的围岩圈层是应变能最为集中的区域，破坏风险高；3.0R以外的圈层环向应变能相对较低。更多还原

【Abstract】 In order to explore the disturbance characteristics of surrounding rock during tunnel boring machine(TBM) excavation, this study is based on the DXL tunnel engineering and uses similar model tests to investigate the radial displacement release characteristics and cumulative variation characteristics of circumferential strain energy in the surrounding rock space in front of and behind the TBM face at 45°, 90°, and 180° under bidirectional isobaric conditions as the TBM face moves. The results show that: during TBM tunnel excavation, the radial displacement release rate and circumferential strain energy accumulation increment of the monitoring surface can be divided into three stages: early, middle, and late. Among them, the radial displacement release rate of the surrounding rock in the middle stage accounts for 65.0% of the total, and the circumferential strain energy change accounts for 74.1% of the total, which is the most severe stage for the displacement release rate and circumferential strain energy change of the tunnel body. During the excavation process of TBM under bi-directional isobaric conditions, the circumferential strain energy of the tunnel surrounding rock forms different strength accumulation zones, which can be divided into four boundary ranges: high, secondary high, medium, and low. Among them, the surrounding rock layer within 1.5R is the area with the most concentrated strain energy and a high risk of failure; the circumferential strain energy of layers outside 3.0R is relatively low.更多还原