超密实地基堆场铺面结构优化设计

非洲某集装箱堆场已使用数十年，目前堆4层集装箱，采用正面吊作业，铺面结构无面层和基层，集装箱直接堆在地基上，地基为4 m的人工回填密实贝壳砂层，下面为原状黏土质砂。现堆场改造要求堆5层集装箱，并采用正面吊作业。按英标重型铺面设计手册规定，铺面结构厚度较厚，原因是高强度的贝壳砂层地基不能充分利用。通过铺面结构加铺层设计理论，利用已有的密实贝壳砂层来减少铺面结构设计厚度，同时采用有限元计算对优化后铺面结构基层底拉应力进行复核，优化后铺面结构可以满足设计要求。

Design optimization of yard pavement structure for super-dense foundation

A container yard in Africa has been used for decades.At present,it is stacked with 4 layers of containers,which are operated by reach stacker.The pavement structure has no surface layer and base course.The containers are directly stacked on the foundation.The base is 4 m artificial backfill with compact shell sand layer,and the bottom is undisturbed clay sand.The current yard reconstruction requires stacking 5 layers container,which are operated by reach stacker.According to the structural design of heavy duty pavements for ports and other industries,the thickness of the pavement structure is thick,because the shelly sand layer with high foundation strength cannot be fully utilized.Through the pavement structure overlay design theory,the existing dense shelly sand layer is used to reduce the thickness of the pavement structure design,and the finite element calculation is used to check the tensile stress of the optimized pavement structure base layer.The optimized pavement structure can meet the design requirements.