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钻井船插桩对邻近桩P-△效应影响的模型试验
杨喜涛, 王建华, 范怡飞
天津大学
摘要:
为了研究钻井船作业过程中桩靴(spudcan)的贯入对邻近桩P-效应的影响,在砂土层中开展了1g条件下的模型试验,邻近桩桩头条件分为弹性桩头和自由桩头,桩靴边缘到邻近桩边缘净间距为0.25倍桩靴直径。通过对桩靴贯入土层前和桩靴贯入土层过程中邻近桩桩身弯矩的测量,得出两种桩头条件下邻近桩P-效应随桩靴贯入土层深度的变化规律,并对两种桩头条件下邻近桩P-效应随桩靴贯入土层深度的变化情况进行了比较。研究表明:与桩靴贯入土层前相比,两种桩头条件下桩靴的贯入都使邻近桩P-效应减弱,且这种减弱作用在邻近桩桩头受弹性约束时更加明显。这些结论为研究钻井船插桩对邻近桩的影响提供有益参考。
关键词:  模型试验  桩靴  砂土场地  邻近桩  P-效应
DOI:10.11759/hykx20181118001
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
Model Tests on Effects of Spudcan Penetration on the P- effect of Adjacent Piles
yangxitao, wangjianhua, fanyifei
Tianjin University
Abstract:
A series of model tests in sand under 1g condition were conducted to investigate the influence of spudcan penetration on the P- effect of an adjacent pile. The behaviors of piles with elastic and free pile head constraints were observed respectively, and a spudcan-pile clearance of 0.25 times the spudcan diameter was selected. The changing pattern of P- effect with the above two pile head constraints was analyzed by comparing the pile shaft bending moment before and after spudcan penetration. The influence of spudcan penetration was also compared at different penetration depths. Compared with the P-effect before spudcan penetration, it is indicated that spudcan penetration weakens the P- effects under both pile head constraint conditions, and the weakening effect is more obvious in the pile with an elastic pile head. These conclusions can provide a useful guidance for the investigate to the influence of spudcan penetration on the adjacent pile.
Key words:  model test  spudcan  sand  adjacent pile  P- effect
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