分岔隧道稳定性分析及施工优化研究.pdf

文档介绍：第 27 卷第 3 期岩石力学与工程学报 Vol. 27 No. 3
2008 年 3 月 Chinese Journal of Rock Mechanics and Engineering March,2008



分岔隧道稳定性分析及施工优化研究

李术才 1,王汉鹏 1,郑学芬 2
(1. 山东大学岩土与结构工程研究中心,山东济南 250061;2. 山东城市建设职业学院,山东济南 250014)

摘要:建立中墙承载模型,通过理论分析分别给出连拱和小净距隧道的中墙稳定性判据,据此可得到中墙的合理
厚度。以八字岭分岔隧道为例,分别采用地质力学模型试验和弹塑性损伤有限元模拟分岔隧道的施工全过程,给
出围岩关键点位移和应力随施工过程的变化曲线以及围岩损伤区和塑性区的分布,提出分岔隧道的施工过程的优
化措施。研究爆破施工对隧道稳定性的影响,提出不同中墙宽度、不同围岩情况下装药量的大小及施工措施。根
据上述研究结果,针对原施工设计提出优化建议。对分岔隧道施工进行现场监测,监测数据与试验和计算数据的
对比验证了试验和数值计算的正确性。监测结果表明隧道稳定,说明施工优化建议合理。
关键词:隧道工程;分岔隧道;稳定性;施工优化;模型试验;数值分析
中图分类号:U 45 文献标识码:A 文章编号:1000–6915(2008)03–447–11

FORKED TUNNEL STABILITY ANALYSIS AND ITS CONSTRUCTION
OPTIMIZATION RESEARCH

LI Shucai1,WANG Hanpeng1,ZHENG Xuefen2
(1. Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan,Shandong 250061,China;
2. Shandong Urban Construction Vocational College,Jinan,Shandong 250014,China)

Abstract:The load-bearing model for middle wall is established. The criterion for stability of middle wall in
multi-arch tunnel and tunnel with small spacing is presented through theoretical analysis. According to the
criterion,the rational thickness of the middle wall can be obtained. Taking Baziling forked tunnel for example,the
whole construction process of the tunnel is simulated by geomechanical model test and elastoplastic damage finite
element program respectively. The change curves of displacement and stress at key points with construction steps
and the distribution of damage zone and plastic zone in surrounding rock are presented;and the optimization
measures for construction process are put forward. The influence of blasting construction on tunnel stability is also
researched;and the quantities of charge and construction measures under the conditions of different middle wall
widths and different surrounding rocks are presented. According to the research results,the suggestions are made
to modify the original c