论文部分内容阅读
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。
In the deep-water unloading piled-wharf structure, the group pile foundation with the unloading bearing plate can transfer a part of the earth pressure load originally acting on the wharf structure to the deeper and wider soil so that the wharf structure Stable and horizontal displacement control within the allowable range. There are 2 types of connection between the unloading plate supporting platform and the erecting concrete bored pile in group pile foundation structure: rigid connection and hinged connection. Obviously, different forms of pile-table connection will affect bored piles, unloading platens and Force and displacement of other components. For the two kinds of coupling type comparison and selection, through the geotechnical centrifuge model test, this paper simulates and reproduces the working characteristics of the two types of pile-platform unloading type sheet pile wharf, and measures the bending moment of the pouring pile and the front wall, Land-based earth pressure, pull rod force and the wharf structure horizontal displacement. The results show that when the piles are abutted, the wharf structure horizontal displacement and pull rod force are small, but the bending moment of the bored pile is strong, especially the bending moment at the top of the pile is too large, which is close to the design value of bored pile bending moment, While the pile table hinge can greatly reduce the pile top bending moment value, the pile body force is more reasonable, the level of the wharf structure displacement and the rod force is also within the safe allowable range, therefore, it is recommended to unload the deck plate and upright Concrete bored pile hinged appropriate.