大直径后注浆灌注桩在极软岩地质条件码头中的应用

Application of post-grouting pile with large diameterin wharfs with extremely soft rock geological condition

湄洲湾港秀屿港区石门澳作业区11#泊位工程建设1个10万吨级通用泊位及相应的配套设施,码头平台采用高桩梁板式结构,对地基承载力要求高。针对码头平台下部基础为极软岩的地质条件,对码头平台的大直径灌注桩采用桩端后注浆工艺,通过静载试验对比分析未注浆与后注浆灌注桩。结果表明,经过桩端后注浆的灌注桩有效提高单桩竖向承载力,控制了码头沉降量,减小基桩的入土深度,缩短工程建设工期,节省工程造价,具有显著的经济效益和社会效益。

The project of Berth 11 in Shimen'ao operation area of Xiuyu port area in Meizhou Bay Port,is a project constructing a 100,000 DWT bulk and general cargo wharf with relevant supporting facilities.The wharf is a high-piled beam-slab structure,which requires high foundation bearing capacity.In response to the geological condition of the lower part of the wharf foundation which is extremely soft rock,post-grouting technology is adopted at the pile toe of large-diameter cast-in-place piles,the static load test results of non-grouting and post-grouting cast-in-place piles is compared.The results show that the post-grouting pile can effectively improve the vertical bearing capacity of single pile,control the settlement of wharf,reduce the depth of foundation pile,shorten the project construction period,save the project cost,and has significant economic and social benefits.