桩端持力层起伏较大时提高单桩竖向抗拔承载力的方法分析

Analysis on the Method of Increasing Vertical Uplift Bearing Capacity of Single Pile When the Bearing Layer of Ppile End Fluctuates Greatly

对某工程实例工序优化前后2次试验桩的单桩承载力特征值进行了研究,验证了当承载力检测值不满足设计要求时,通过增加后注浆及刷壁器“破壁”等工序,能够有效提高在桩端持力层起伏较大的情况下的单桩竖向抗拔承载力。

This article studied the bearing capacity characteristic value of two test piles before and after process optimization of a project example,and it is verified that when the bearing capacity test value does not meet the design requirements,the vertical uplift bearing capacity of a single pile can be effectively improved under the condition of large fluctuation of the bearing layer at the pile end by adding post-grouting and addingthe wall brush to“break the wall”.