正面吊作用下混凝土板规范计算厚度过大的原因探讨

大连港大窑湾港区6#和7#泊位集装箱堆场箱角间混凝土板厚按规范计算需40 cm,实际工程仅为20 cm.原设计不允许正面吊作业,实际正面吊进行了相当长时间作业后,混凝土板并未破坏.对铺面设计进行计算比较认为:混凝土板规范计算厚度过大的原因是刚性铺面下采用的土基回弹模量过小.

Reasons of excessive thickness of concrete slab calculated from standard in the container yard pavement under action of reach stacker

According to the standard when calculating the thickness of the concrete slab, the value is 400mm in the container yard in berth No. 6 & berth No.7 of Dayaowan port area of Dalian port. But in the practical project, it was only 200 mm. The reach stacker was not allowed to work here by the original design. However, the concrete slab was not damaged after a lengthy operation of the reach stacker virtually. Different pavement designs were compared by calculations and the conclusion was that the reason why the thickness of slab was overlarge was that the modulus of resilience of earth subgrade adopted under the rigid pavement was too small.