基于精细化建模的叠层盾构施工扰动数值分析  

Numerical analysis on construction disturbance of overlaying shield based on refined modeling

作　　者：程子聪 沈蓉 王新新 孙廉威 CHENG Zi-cong;SHEN Rong;WANG Xin-xin;SUN Lian-wei(Shanghai Construction Group Co.,Ltd.,Shanghai 200080,China;Department of Architecture and Civil Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]上海建工集团股份有限公司,上海200080 [2]浙江大学建筑工程学院,浙江杭州310058

出　　处：《地基处理》2019年第2期82-87,共6页Journal of Ground Improvement

基　　金：上海建工集团股份有限公司重点科研项目(16YJKF-07)。

摘　　要：结合上海软土地区某越江叠层盾构隧道施工项目,通过精细化建模和数值分析方法针对既有公路越江盾构隧道管片及螺栓在下叠地铁区间盾构隧道掘进下的物理力学响应机制展开了深入的分析和研究。研究结果表明:在下叠穿越中,既有盾构隧道管片整体呈现为顶部和底部外侧受拉,两侧腰部内侧受拉,且最大拉应力出现隧道底部外侧,对应于管片最大拉应力出现的位置,螺栓最大拉应力也出现在既有盾构隧道结构的底部;随着下叠盾构穿越施工中土体损失率的不断增加,既有盾构隧道管片最大拉应力和螺栓最大拉应力也逐渐增大,为保证施工安全,宜将土体损失率控制在0.5%之内。Combining a construction project of river-crossing laminated shield tunnel in soft soil area of Shanghai,the physical and mechanical response mechanism of segments and bolts of the existing river-crossing shield tunnel under the excavation of shield tunnel was analyzed by means of refined modeling and numerical analysis.The results show that segments of existing shield tunnel were tensioned at the top and bottom as well as the waist on both sides in the process of undercrossing,and the maximum tensile stress occurred at the outside of the tunnel bottom.Corresponding to the location where the maximum tensile stress occurred,the maximum bolt tensile stress also occurred at the bottom of the existing shield tunnel.With the increasing of soil loss rate during the construction of udercrossing shield tunnel,the maximum tensile stress of the segments and bolts of existing shield tunnel also increase gradually.In order to ensure the safety of construction,the soil loss rate should be controlled within 0.5%.

关 键 词：精细化模拟 叠层盾构 施工扰动 

分 类 号：U455[建筑科学—桥梁与隧道工程]