水下振动沉管碎石桩施工密实度控制施工技术

Technology for Controlling Density of Vibration Driven Gravel Piles in Underwater Immersed Tubes

温州状元岙围垦工程第三施工段促淤堤在地基处理过程中用水下振动沉管法进行碎石桩施工。通过调整拔管速度、充盈系数、留振时间等措施,利用重型动力触探对碎石桩进行检测,控制碎石桩密实度。工程实践表明,利用水下振动沉管法打设碎石桩对深层软基进行加固是可行的。

During the foundation treatment for building the siltation inducing dyke for the third phase of Zhuangyuanao Reclamation Project in Wenzhou, gravel piles were built by way of underwater vibration driving of immersed tubes. The den- sity of gravel piles were controlled by readjusting the extracting speed, fullness coefficients and stay-up time, and tested by heavy-duty dynamic penetration testing rigs. The engineering practice of the project showed that it is feasible to improve deep soft soils by way of gravel piles built by underwater vibration driven immersed tubes.