板桩码头中群桩基础联接型式的试验研究

doi:10.13722/j.cnki.jrme.2015.0957

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摘要在深水卸荷式板桩码头结构中，带卸荷承台板的群桩基础可将原本作用于岸壁结构上的一部分土压力荷载，转移传递至更深更广的土层中，从而使码头结构保持稳定且水平位移量控制在允许的范围内。群桩基础结构中卸荷承台板与直立混凝土灌注桩的联接有2种型式可供选择：刚接和铰接，显然，不同的桩台联接型式会影响到灌注桩、卸荷承台板和其他构件的受力和位移性状。出于2种联接型式比选需要，通过土工离心模型试验，模拟再现了这2种桩台联接型式的卸荷式板桩码头的工作性状，试验测量了灌注桩和前墙弯矩、墙身陆侧土压力、拉杆力和码头结构水平变位。结果发现，桩台刚接时码头结构水平变位和拉杆力较小，但灌注桩弯矩反应强烈，尤其是桩顶端处弯矩过大，已接近灌注桩弯矩设计值，极易发生开裂破坏，而桩台铰接时则可大大减小桩顶部弯矩值，桩身受力较为合理，码头结构水平变位和拉杆力也在安全允许范围之内，因此，建议卸荷承台板与直立混凝土灌注桩以铰接为宜。

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关键词 ：桩基础, 板桩式岸壁, 群桩, 桩端约束, 弯矩, 离心模型试验

Abstract：Laterally loaded vertical piles with load-relief platform has successfully been introduced to deep-water sheet-pile bulkhead so that a part of massive lateral load due to horizontal soil movement can be transferred through pile group on to deeper and larger soil layers to keep the bulkhead stable within allowable displacement limits. Two types of head fixity conditions，capped head and pinned head，are often used in pile group. Obviously，head fixity conditions have great effects on force bearing status and displacement characteristics of cast-in-place piles，load-relief platform and other structural elements in the sheet-pile bulkhead. Two series of centrifuge model tests are carried out to simulate the sheet-pile bulkheads with pile group with two different head fixity conditions. The bending moments of piles and front wall，earth pressures on retaining side of front wall are measured together with tension forces of tie-rod and horizontal displacements of structural elements. It is found that the lateral pile group with capped head is more powerful than the pile group with pinned head in carrying earth pressure load，reducing tension forces of tie-rods and limiting horizontal displacements of structural elements. However，it is also found that the maximum bending moments of piles with capped head occur close to the pile cap level，and the estimated values are equal to the value of pile's maximum allowable bending moment. Therefore，it is appropriate to the lateral pile group with pinned head which can eliminate the above problem while tension force of tie-rod and inclination of front wall due to horizontal displacement can also be controlled within their allowable limits.

Key words： pile foundation sheet-pile bulkhead pile group head fixity conditions bending moment centrifuge model testing

引用本文:

徐光明1，李士林2. 板桩码头中群桩基础联接型式的试验研究[J]. 岩石力学与工程学报, 2016, 35(S1): 3365-3371.
(1. State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering，Nanjing Hydraulic Research Institute，Nanjing，Jiangsu 210029，China；2. HydroChina Guiyang Engineering Corporation Limited，. Experimental study of head fixity conditions of pile group in sheet-pile bulkhead. , 2016, 35(S1): 3365-3371.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2015.0957 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/3365

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