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合理进尺的选取是影响隧道开挖施工安全和效率的关键问题之一。以杨家坪隧道现场监测数据为根据,通过ABAQUS软件开展数值试算确定了最接近实际隧道围岩的剪胀角,建立了考虑剪胀角影响的Mohr-Coulomb模型的隧道开挖数值模型,并按1.5、2.0、2.5、3.0、3.5 m开挖进尺开展了计算,对开挖过程中隧道围岩的变形和力学响应规律进行了对比研究。结果显示,考虑剪胀角影响的数值模型计算结果的总体规律与实测结果一致性较好;有锚杆支护的情况下开挖进尺选择为3.0 m能较好地兼顾施工安全与效率,应注意控制距开挖面5.0 m范围内的拱顶变形。
Reasonable footage selection is one of the key issues that affect the safety and efficiency of tunnel excavation. Based on the on-site monitoring data of Yangjiaping tunnel, the dilatancy angle closest to the actual tunnel surrounding rock was determined by ABAQUS software. The numerical model of tunnel excavation was established based on the Mohr-Coulomb model with influence of dilatancy angle. 1.5, 2.0, 2.5, 3.0, 3.5 m excavation footage was calculated, and the deformation and mechanical response of tunnel surrounding rock during excavation were compared. The results show that the general rule of the numerical model considering the influence of dilatancy angle is in good agreement with the measured results. The selection of 3.0 m for the excavation footage with the bolt support can better balance the construction safety and efficiency. Pay attention to control the vault deformation within 5.0 m from the excavation face.