内河高桩码头大直径PHC管桩沉桩现场试验及参数优化

Field test and parameter optimization of large diameter PHC pipe pile sinking for high-pile wharf in inland rivers

依托安徽淮北港区孙疃作业区综合码头工程,开展内河高桩码头大直径预应力高强混凝土(PHC)管桩沉桩现场试验及参数优化研究。通过初始地勘报告获得沉桩参数后,进行沉桩可打性分析并优化施工工艺,进行试沉桩、高低应变和静载试验,并根据试验结果进行桩基设计参数优化。结果表明:结合沉桩现场试验中的桩端进入持力层深度和最后贯入度结果,验证了内河高桩码头大直径PHC管桩施工工艺、沉桩设备、沉桩控制参数和停锤标准的可行性;明确了内河高桩码头大直径PHC管桩单位面积极限侧摩阻力标准值和极限桩端阻力标准值的调整系数范围为5%~10%;采用(7)层粉细砂作为桩基持力层,同步优化桩基参数。

Based on the comprehensive wharf project of Suntuan operation area in Huaibei Port area,Anhui Province,we carry out the on-site test and parameter optimization research on large diameter prestressed high-intensity concrete(PHC)pipe pile sinking for high-pile wharf in inland rivers.After obtaining the parameters of pile sinking through the initial geological survey report,we carry out the feasibility analysis of pile sinking and the improvement of construction planning,conduct trial pile sinking,high and low strain and static load tests,and optimize pile foundation design parameters based on the test results.The results indicate that the feasibility of the construction process,pile sinking equipment,pile sinking control parameters,and stopping hammer standards for large-diameter PHC pipe piles of high-pile wharf in inland rivers are verified by the depth of the pile tip entering the bearing layer and the final penetration results in the comprehensive pile sinking on-site test.The adjustment coefficient range for the ultimate lateral friction resistance standard value and ultimate pile end resistance standard value for unit area of large-diameter PHC pipe piles of high-pile wharf in inland rivers is determined by 5%to 10%.The⑦layer of fine sand as the bearing layer of the pile foundation is proposed,and the pile foundation parameters are synchronously optimized.