考虑剪胀角的节理化岩体隧道开挖进尺优化研究

发布时间：2018-01-14 14:17

本文关键词：考虑剪胀角的节理化岩体隧道开挖进尺优化研究　出处：《岩土力学》2016年S1期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The selection of reasonable ruler is one of the key problems affecting the safety and efficiency of tunnel excavation. Based on the field monitoring data of Yangjiaping Tunnel. The shear expansion angle of surrounding rock is determined by ABAQUS software, and the numerical model of tunnel excavation based on Mohr-Coulomb model considering the influence of shear expansion angle is established. At the same time, the calculation is carried out according to the 3.5 m excavation advance of 1.5U 2.0U 2.5U 3.0m, and the deformation and mechanical response of surrounding rock of the tunnel during the excavation are compared and studied. The results show that the deformation and mechanical response of the surrounding rock in the tunnel are different from each other. The overall law of the numerical model considering the influence of shear expansion angle is in good agreement with the measured results. Under the condition of bolting support, the selection of excavation scale of 3.0 m can give good consideration to the construction safety and efficiency, and attention should be paid to controlling the deformation of the arch within 5.0 m from the excavating surface.
【作者单位】：武汉理工大学资源与环境工程学院;中国科学院武汉岩土力学研究所;
【基金】：中央高校基本科研业务费专项资金(No.2015IVA028)~~
【分类号】：U455
【正文快照】： 1引言隧道围岩大变形是目前公路、铁路隧道建设中遇到的重要科学问题,在地下工程中岩体膨胀扩容导致边墙大变形的情况非常常见[1?3]。陈宗基等[4?5]研究了隧洞变形和岩石剪胀之间的关系,提出了岩石扩容起始的判据。与岩石的扩容相比,岩石的剪胀形成了裂隙之间的贯通,表现出了

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