港口道路、堆场混凝土铺面垫层的设置

Setting of gravel sub-base under concrete pavement of roads and storage yards at the port

回填开山石(渣)形成的港口陆域,经过强夯和振动碾压后作为道路、堆场混凝土铺面的土基,当前一般采用的回弹模量为60 MPa,并在土基上设置200 mm左右的碎石垫层。通过大连港建成的工程实例反算土基回弹模量,认为混凝土铺面下采用土基回弹模量过低,可大幅度提高,且根据规范相关规定可不必设置垫层。

The harbor land area formed by backfilling hill stones（ broken bits） is served as the earth base under the pavement of roads and storage yards after dynamic compaction and vibration rolling. At present, the generally adopted rebound modulus is 60 MPa, and on the earth base, the gravel sub-base which is about 200 mm thick is set. Through the engineering project finished in Dalian port to inversely calculate the rebound modulus of earth base, it is considered that the rebound modulus of earth base adopted under the concrete pavement is too low and can be largely improved.According to relevant regulations of the specification, it is not necessary to set sub-base.