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在对某工程中基桩进行高应变动力检测抽检时,发现部分嵌岩桩承载力未达到设计要求,通过钻芯法验证发现:部分基桩桩端沉渣过厚,另有部分基桩桩端未达到进入中等风化岩层的设计要求。该嵌岩桩采用冲击成孔法施工,出现事故的主要原因是上部填土和松散粉土部位未做护筒且泥浆未按要求制配,导致塌孔发生。针对工程的实际状况,对工程基桩进行了全面抽芯检测,根据桩端有无沉渣和桩端持力层的实际情况制定不同的加固方案,取得了理想的加固效果。
In a project of high-strain dynamic detection of the pile foundation, we found that some of the rock-socketed pile bearing capacity does not meet the design requirements, verified by the core found that: part of the pile foundation pile too thick, and some pile ends Did not reach the design requirements of medium-scale weathered rock formation. The rock-socketed pile by the impact of the hole into the construction method, the main reason for the accident is the upper part of the earth and loose silt part of the casing and the mud did not make the system as required, leading to collapses occurred. According to the actual situation of the project, a comprehensive core pulling detection was carried out on the foundation piles. According to the actual situation of whether there is any sediment on the pile end and the bearing capacity of the pile end, different reinforcement schemes were made and the ideal reinforcement effect was achieved.