摘要
在盾构隧道混凝土管片的设计中,管片截面内力的计算是重要的一环。为了研究水土合算和水土分算模型对管片截面内力的影响,以琼州海峡海底隧道为研究背景,利用ANSYS软件建立了管片的等刚度圆环模型、铰接模型和梁-弹簧模型,并通过水土合算和水土分算两种方法计算研究了管片的内力特征。研究表明,两种计算方法的弯矩差异很大,轴力差异较小,水土合算的最大弯矩比水土分算大2.2～2.9倍,轴力比水土分算大11%～16%。数值模拟了水土分算模型下覆水深度对混凝土管片内力的影响,研究表明当覆水深度从40 m增加到120 m时,混凝土管片的最大弯矩增加了4.0%,最大轴力增加了51.4%,管片的轴力相对于弯矩受水压影响较大。
In the design of concrete segments of shield tunnels,the calculation of internal forces of segment sections is an important part.In order to study the influences of combining calculation of water and soil pressure and separate calculation of water and soil pressure on internal forces of segment sections,with Qiongzhou strait sub-sea tunnel as the research background,ANSYS software is used to build the equivalent stiffness annulus model,hinged model and beam-spring model of the segments,and the internal force characteristics of the segments are calculated by the two methods,the combining calculation of water and soil pressure and the separate calculation of water and soil pressure.The results show that the difference of the bending moment between the two methods is great while the difference of the axial force is small,the maximum bending moment of combining calculation of water and soil pressure is 2.2~2.9 times larger than that of separate calculation of water and soil pressure,and the axial force is 11%~16% larger than that of separate calculation of water and soil pressure.The influence of water depth on the internal forces of the concrete segment under model of separate calculation of water and soil pressure is numerically simulated.It is found that when the depth of water is increased from 40 m to 120 m,the maximum bending moment of the concrete segment increases by 4%,the maximum axial force increases by 51.4%,and the axial force of the segment is more influenced compared to the bending moment.
作者
李守巨
郭凯
于贺
Li Shouju;Guo Kai;Yu He(State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, Liaoning;School of Architecture & Civil Engineering,Shenyang University of Technology , Shenyang 110870)
出处
《工程建设》
2019年第3期1-8,共8页
Engineering Construction
基金
国家重点基础研究发展计划"973"项目(2015CB057804)
国家自然科学基金资助项目(11572079)
工业装备结构分析国家重点实验室开放基金资助项目(S14206)
关键词
混凝土管片
水土合算
水土分算
内力
有限元方法
concrete segment
combining calculation of water and soil pressure
separate calculation of water and soil pressure
internal force
finite element method
