摘要
以重庆地铁六号线花卉园—大龙山小净距渐变重叠隧道为背景,采用数值模拟和现场监测相结合的手段,研究了盾构机动载作用下小净距渐变重叠隧道的变形、附加内力及弯矩,揭示了"隧道先开挖,盾构机后通过"施工形式对已有小净距渐变重叠隧道稳定性的影响规律。研究结果表明:盾构机在上洞步进引起的下洞最大位移变化点位于支撑靴后方2～3 m附近,不均匀沉降主要出现在支撑靴前方1.5D(D为隧道直径)到后方2.5D的范围内;盾构机后通过上洞将引起下洞在支撑靴后方产生较大的附加力,而前方影响较小。在此基础上提出了以减弱纵向效应和增强自身抵抗力为主的应对措施,并在重庆轨道六号线的后期施工中得到充分利用,取得了显著效果。
Based on Huahuiyuan—Dalongshan small space gradient overlapping metro tunnels of Chongqing Transit Line 6,the deformation,additional inner force and bending moments were studied under shield dynamic load by numerical simulation and monitoring,and laws of the existing tunnel stability effected by the shield machine passed through were revealed.The results indicate that the maximum deformation occurs about 2 to 3m behind the support boots of shield machine,and uneven settlement mainly occurs in the range between 1.5D( D is the diameter of the tunnel) in front of the support boots and2.5D behind; shield passing will cause significant additional internal force behind the support boots and little influence forward.According to this,the countermeasures have been taken into account,mainly including weakening longitudinal effect and enhancing its own resistance,which are fully utilized in the post-construction of Chongqing Transit Line 6,and a good effect has been achieved.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2013年第5期930-933,949,共5页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家自然科学基金委专项创新研究群体基金项目(50921063)
重庆市科技攻关项目(cstc2012gg-yyjs90001)
关键词
盾构
重叠隧道
附加内力
纵向效应
稳定性
shield overlapping tunnel
additional inner force
longitudinal effect
stability
