摘要
在盾构机顶推进程中,在管片与传力垫间存在缺陷会导致管片受力不均匀,形成的劈裂拉应力超过材料的抗拉强度时将出现裂缝,因此进行盾构施工阶段管片力学行为研究有重要意义。,利用大型通用软件ADINA建立三维有限元模型,通过接触算法,分析了传力垫与管片之间不同位置的缺陷对结构力学行为的影响,结果表明:缺陷的出现对管片受力性能影响较大,会导致管片提前开裂,并降低管片的极限荷载,不同位置的缺陷对的荷载值的影响程度不同,对裂缝分布的影响不明显。
Due to the gap between the segment and the bearing pad will lead to non-uniform stress in the segment to a certain extent or even a splitting tensile stress when the segments were pushed by the shield tunneling machine,structural response of the segment in the construction phase is the key research issue on the mechanical performance of tunnel segment lining now The three-dimensional finite element method was adopted in this paper to investigate this issue. The finite element model with a certain assembly tolerance between the segment and the bearing pad was established using the general finite element software ADINA. The structural behavior between the segment and the bearing pad was analyzed using contact algorithm to simulate the actual behavior due to the influence of the assembly tolerance. The finite element analysis results show that the assembly tolerance between the segment and the bearing pad could significantly affect the mechanical behavior of the segment under the jack loading. It will decrease the cracking load and ultimate load of segment. Different locate of assembly tolerance will decrease differently. But it has little influence on the distribution area and the orientation of crack.
出处
《公路工程》
北大核心
2015年第2期195-198,202,共5页
Highway Engineering
关键词
管片
传力垫
有限元分析
力学行为
缺陷
segment
bearing pad
finite element analysis
structural behavior
assembly tolerance
