小净距隧道洞口段施工方法优化分析  

Optimization Analysis of Excavation Method in Portal Section of Neighborhood Tunnel

作　　者：宿钟鸣[1] 薛晓辉[1] 

机构地区：[1]山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室,山西太原030006

出　　处：《华北水利水电学院学报》2013年第6期22-24,共3页North China Institute of Water Conservancy and Hydroelectric Power

基　　金：山西省交通建设科技项目(11-2-18)

摘　　要：以小净距林屋隧道洞口段开挖为工程背景,对现场爆破振动、拱顶沉降和水平收敛进行监控量测.监测结果表明,在超前大管棚支护下,原设计开挖方法(CRD法)需要进行优化.由此提出了台阶法施工的方案,并结合洞口段地形状况和掌子面实际暴露的围岩状况,建立了有限元数值分析模型,以验证台阶法施工的合理性.监测和数值分析结果表明:台阶法施工的方案可行,体现了新奥法动态设计和施工的理念.结果可为超前大管棚支护下小净距隧道洞口段的开挖提供参考和借鉴.Based on the excavation of portal section in Linwu neighborhood turmel, the blasting vibration, vault settlement and level convergence are measured in the field construction. The results indicate that under the circumstances of advance large pipe-shed roof support, the original excavation method （ Cross Diaphragm Method） needs to be optimized. Thus, construction program with step meth- od is proposed. According to the actual terrain in portal section and exposed surrounding rock, the finite element analytical model is es- tablished to verify the reasonableness of the construction with step method. So the construction with changed step unethod is feasible, which reflects the ideas of dynamic design and construction in New Austrian Tunneling method. The results can provide reference for the excavation of portal section in neighborhood tunnel under the circumstances of advance large pipe-shed roof support.

关 键 词：小净距隧道 超前大管棚支护 数值模拟 台阶法 

分 类 号：TV554[水利工程—水利水电工程] U455.4[建筑科学—桥梁与隧道工程]