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IN-SITU MONITORING AND ANALYSIS OF DEFORAMTION OF THE SUPPORT SYSTEM IN MULTI-ARCH TUNNEL
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摘要: 与普通公路隧道相比，连拱隧道因隧道施工复杂，工序转换繁多，其变形特征更加复杂。结合某连拱隧道工程实践，在连拱隧道施工中对支护体系变形进行现场监测的基础上，分析连拱隧道支护体系变形随时间变化的规律及不同开挖工序下支护体系变形特征。监测结果表明:采用台阶法施工，能较好地控制连拱隧道的变形;在隧道施工过程中，右导洞上、下台阶开挖对支护变形影响较大，是隧道结构稳定性主要控制点;左洞上台阶和右洞下台阶开挖的纵向影响距离约为隧道跨度的2倍，右洞上台阶和左洞下台阶开挖的纵向影响距离大致为一倍隧道跨度。Abstract: Different from normal tunnel,the deformation characteristics of the multi-arch tunnel are more complex because of complex construction processes and many construction conversions.Based on the multi-arch tunnel project,the monitoring of support system deformation was carried out.And the law of the deformation developing with time and deformation characteristic of different construction procedures was analyzed.The surrounding rock deformation could be better controlled by using the bench method.Under construction of tunnel,the excavation of the upper bench and the down bench of the right drift has a great effect on surrounding rock deformation.So they are the main stages to control the support structure deformation.The longitudinal incidence of the excavation of the upper bench in the left tunnel and the down bench of the right tunnel is about two times of the span of the tunnel.And the incidence of the down bench in the left tunnel and the upper bench of the right tunnel is about the span of the tunnel.
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Key words:
- tunnel engineering /
- multi-arch /
- support system /
- in-situ monitoring /
- deformation characteristic
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