裂缝位置对盾构隧道结构应力与变形的影响研究  

Study on the Influence of Crack Location on Stress and Deformation of Shield Tunnel Structure

作　　者：裘志坚[1] 涂俊胤 窦洪羽 于海坤 贾丁丁 QIU Zhijian;TU Junyin;DOU Hongyu;YU Haikun;JIA Dingding(Hangzhou Metro Group Co.Ltd.,Hangzhou Zhejiang 310003,China;China Railway Construction Bridge Engineering Bureau Group Co.Ltd,Tianjin 300300,China;China Railway 19th Bureau Group Co.Ltd.,Beijing 100176,China)

机构地区：[1]杭州市地铁集团有限责任公司,浙江杭州310003 [2]中铁建大桥工程局集团有限公司,天津300300 [3]中铁十九局集团有限公司,北京100176

出　　处：《铁道建筑技术》2023年第8期140-143,共4页Railway Construction Technology

基　　金：浙江省自然科学基金项目(LQ18E090003)。

摘　　要：以杭州地铁八号线工程为实例,采用扩展有限元法分析盾构隧道衬砌结构在不同裂缝位置下的变形和应力变化规律。计算结果表明:盾构隧道开挖轴线处的地表沉降值最大,随着地表离隧道轴线的水平距离不断增大,地表沉降值不断减小,裂缝位于拱腰两侧,地表最大沉降值最大,衬砌裂缝位于拱顶,地表最大沉降值最小;裂缝位置对隧道衬砌顶部与底部的环向位移影响较大,裂缝位于拱顶或者拱底,衬砌内环裂缝处拉应力急剧降低,而衬砌外环裂缝处压应力急剧增大。Taking the project of Hangzhou Metro Line 8 as an example,the deformation and stress law of shield tunnel lining structure under different crack locations were analyzed by using extended finite element method.The calculation results show that:the maximum surface settlement value is found at the axis of shield tunnel excavation,the surface settlement decreases with the increase of the horizontal distance between the surface and the tunnel axis,the cracks are located on both sides of the arch waist,the maximum surface settlement is the largest,the lining cracks are located at the vault,and the maximum surface settlement is the smallest.The location of cracks has great influence on the circumferential displacement of the top and bottom of tunnel lining.When the cracks are located at the top or bottom of the arch,the tensile stress at the cracks of the inner ring of the lining decreases sharply,while the compressive stress at the cracks of the outer ring of the lining increases sharply.

关 键 词：盾构隧道 裂缝位置 衬砌结构 变形应力 数值模拟 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]