夯扩桩施工工艺效果的地球物理方法评价

Evaluation of Results of Construction Technique for Compacted Expanded Base Concrete Piles by Geophysical Method

由于夯扩桩成桩方法成本低 ,已逐渐成为软土地基中的一种新的理想桩基形式。为了检测和提高夯扩桩工艺水平 ,我们采用探地雷达检查地下桩形 ,以小应变、静载进行了基桩质量检测。认为 :选择合适的持力层是夯扩桩成功的首要条件 ,特别对横向土层变化较大的地区 ;加料多次夯扩并不一定能增加桩的承载力 ;而未加料的复打则有利于桩的承载力的提高。

Owing to the low cost the compacted expanded base concrete piles are going to be an ideal foundation used in soft soil. In order to improve the examination for the said piles the georadar is used to explore the form of the piles, and the quality of piles is inspected by low strain approach and static loading tests. The results show that the suitable bearing stratum is the first condition for the successful use of the piles, especially in the area with variable horizontal soil. The repeated compacting with additional aggregate may not be able to improve the bearing capacity, but the repeated compacting with no additional aggregate can improve the bearing capacity of the piles.