广州港南沙四期工程轨道地基处理

Rail foundation treatment in the Guangzhou Port Nansha phase Ⅳ

广州港南沙港区四期工程采用自动化轨道式龙门起重机(ARMG),ARMG对地基基础的要求较高。由于原状软土厚度较大,大面积真空预压处理的地基不能满足使用要求,需要对轨道地基进行二次处理。结合工程地质条件和ARMG使用要求,通过方案比选,采用水泥搅拌桩复合地基对轨道进行二次地基处理。堆场区轨道基础采用钢筋混凝土地基梁结构+水泥搅拌桩复合地基,过路段轨道基础采用钢筋混凝土轨道板结构+水泥搅拌桩复合地基。钢筋混凝土地基梁+水泥搅拌桩复合地基方案可以满足轨道的使用要求,造价较低、过路段差异沉降较小。

Automated Rail Mounted Gantry(ARMG)is adopted in the Guangzhou Port Nansha phase Ⅳ,and ARMG has higher requirements for foundation. Due to the large thickness of undisturbed soft soil, the foundation treated with large-area vacuum preloading cannot meet the requirements for use, and secondary treatment of the rail foundation is required. Combined with the geological condition and the use requirements of ARMG,through the comparison of selection of plans, the composite foundation of cement mixing piles is used for the secondary foundation treatment of the rail. The reinforced concrete foundation beam structure + the composite foundation of cement mixing piles is adopted in the yard area rail foundation. The reinforced concrete rail slab structure + cement mixing pile composite foundation is adopted in the rail foundation in the crossing section. The reinforced concrete foundation beam + cement mixing pile composite foundation scheme can meet the use requirements of the rail with low cost and small differential settlement in the crossing section.