大直径泥浆护壁嵌岩灌注桩承载特性现场试验

Field test on bearing behavior of large diameter rock-socketed cast-in-place piles with mud protection

以威海某高层住宅桩基工程为例,对3根大直径泥浆护壁嵌岩钻孔灌注桩(其中1根采用桩侧后注浆处理)进行静载荷试验分析其承载性能。研究结果表明:3根试桩承载力及沉降均满足设计要求。采用桩侧后注浆处理的试桩的桩身沉降及回弹量相比其余试桩减小幅度均超过29%。

Taking a pile foundation project of a high-rise residential building in Weihai for example,the bearing capacity of 3 large diameter rock-socketed cast-in-place piles with mud protection(one of them is treated by postgrouting） was analyzed through static load test. The results show that the bearing capacity and settlement of the 3 test piles all meet the design requirements. The pile settlement and springback of test pile treated with post-grouting is more than 29% lower than that of the remaining piles.