分舱板对海上风机混凝土筒型基础承载模式的影响

INFLUENCES OF BULKHEADS ON THE BEARING MODE OF CONCRETE BUCKET FOUNDATION FOR OFFSHORE WIND TURBINE

出于拖航稳性、施工下沉、精细调平及结构强度的原因,混凝土筒型基础筒内须设置分舱板。一般设计时不考虑分舱板对承载力的作用,实际上分舱板的存在对于筒型基础的承载模式和承载能力本身是有一定的影响。通过数值模型定量对比带分舱板和无分舱板两种混凝土筒型基础的承载特性,得到分舱板对承载模式的影响。结果显示带分舱板的基础与无分舱板的基础承载模式基本相似,当荷载较小时分舱板对承载力的作用不明显,因此基础设计时可以不考虑分舱板的作用,但随着荷载的增加,分舱板对承载力的提高作用逐渐显现,当达到极限承载时,基础竖向承载力提高6.9%,水平承载力提高18.3%,弯矩承载力提高16.5%,在极端条件下,带分舱板的混凝土筒型基础将具有更大的安全储备。

For towing stability,sinking,fine leveling construction and structural strength purposes,it is necessary to set bulkheads in the concrete bucket foundation.Usually the influence of bulkheads on the bearing capacity of a foundation is not considered,however,bulkheads actually have a certain influence on the bearing mode and bearing capacity.The influence of bulkheads on the bearing mode was quantitatively analyzed by the comparison of two concrete bucket foundations with and without bulkheads.The results show that the bearing modes of two foundations with and without bulkheads are similar.No obvious effect on the bearing capacity when the load is small,so it is reasonable that not to consider the role of the bulkheads in foundation design,but as the load increases,the effect of bulkheads on the bearing capacity improvement gradually appears,when the bucket foundation reaches the ultimate bearing capacity,6.9% of vertical bearing capacity,18.3% of horizontal bearing capacity and 16.5% of bending bearing capacity increase,which means that in extreme conditions a concrete bucket foundation with bulkheads will have greater safety margin.