论文部分内容阅读
土地资源紧缺使得在地基回填基料缺乏的天津沿海港区建设中,首次采用了部分桩体“悬空”的高承台管桩基础,如何确定这些悬空管桩的水平抗力特性是工程实践应用中的难题之一。针对天津东疆保税港区物流加工区二期工程所采用的高承台管桩基础,运用有限元分析软件ABAQUS对水平荷载作用下高承台管桩的受力性状进行模拟。分析了不同桩长、不同桩径、不同桩身弹性模量、不同土质条件下以及不同悬空高度下高承台管桩的荷载传递性状及承载力的变化规律,并与低承台管桩受力性状进行比较。有限元分析结果表明,当悬空高度不大于1.7m时,高承台管桩水平极限承载力变化不大,而当悬空高度超过1.7m时,其承载力迅速减小。增加土体强度、桩身模量和桩径有助于提高高承台管桩水平极限承载力,桩长对其影响不大。
Due to the shortage of land resources, for the first time in the construction of Tianjin coastal port with a lack of foundation backfill material, it is the first time to adopt the foundation of high pile cap pile with partial pile “floating”. How to determine the horizontal resistance characteristics of these dangling pile is an important issue in engineering practice One of the problems. Aiming at the high capped pile foundation used in the second phase of the logistics processing zone in the bonded area of Dongjiang Bonded Port in Tianjin, the finite element analysis software ABAQUS was used to simulate the bearing behavior of the high capped pile under the horizontal load. The variation of load transfer characteristics and bearing capacity of high pile cap pile under different pile lengths, different pile diameters, different elastic modulus of pile body, different soil conditions and different suspended heights is analyzed. Compare. The results of finite element analysis show that when the suspended height is less than 1.7m, the horizontal ultimate bearing capacity of high pile cap pile does not change much, and when the height of suspended pile exceeds 1.7m, its bearing capacity decreases rapidly. Increasing soil strength, pile modulus and pile diameter can help to increase the horizontal ultimate bearing capacity of pile caps with high pile capounts, and pile length has little effect on them.