基坑护坡桩混凝土强度不足病态评估及加固设计

Assessments and Mitigation of Strength Insufficiency Defections in the Slope Protection Piles

先期施工的基坑护坡桩混凝土强度不足病态评估,是一个较少见的问题,以某基坑护坡桩强度检测评估和继续利用为例,从取芯抗压强度取值、芯样代表性判定、用于评估的混凝土强度选择原则确定、评估取值输入与计算方法等方面,深入探讨了和形成了一套基坑护坡桩桩身混凝土强度不足问题的评估方法,在此基础上形成了加固设计方案,应用于基坑工程继续开挖和旧有支护结构的利用,取得成功,为类似工程问题解决提供了借鉴。

The assessment of the strength insufficiency defects in slope protection piles for the deep excavation projects is a topic that receives few attentions in the geotechnical society.This paper presents a case history of testing and evaluation of the concrete strength from the slope protection piles.The compressive strength values,the representative cored samples from the pile,principles of strength determination and calculation of the compressive strength are thoroughly discussed in the paper.The method of assessment of the low strength in the slope protection piles are established and the mitigation of these defected piles are proposed.This approach can be applied in the continuation of the deep excavation and re-use the existing support structures.