大跨度、浅覆土、小净距隧道锚微扰动开挖施工技术研究

摘要

为实现浙江省官山大桥大跨度、浅覆盖、小净距隧道锚的微扰动开挖施工，文中采用有限元方法并结合施工组织及施工工效的比较，确定了台阶法在流纹斑岩等硬质岩体隧道锚开挖施工中的适用性。施工过程中采用分区爆破、合理选择爆破器材，以及动态调整爆破参数、开展监控量测等措施，实现了爆破能量精准发力。%In order to achieve micro-disturbance excavation and construction in large-section,shallow-cover,and small-clear-distance tunnel anchor of Guanshan Bridge in Zhejiang Province,both finite el-ement method and construction organization and efficiency comparison are used to study the adaptabili-ty of the bench method in hard rock such as rhyolite porphyry.Besides,partition blasting,reasonable blasting equipment,dynamically adjusting blasting parameters,and construction monitoring are used to ensure the blasting effect.