强风化泥岩地基嵌岩打入桩承载性状分析

摘要

Based on a large-scale pile project in Qingdao, the bearing capacity of 3 rock-socketed piles in strongly weathered mudstone under the ultimate load was analyzed through the static load test. The results show that the Q-s curves of the 3 engineering piles all feature a quick descent, and the settlement of the pile top exceeds 40 mm. The bearing capacity of the piles does not meet the design requirements. Based on the results of standard penetration test and static load test on many engineering piles, it is concluded that the insufficient bearing capacity of the piles is mainly due to the disintegration and softening effect of groundwater on the strongly weathered mudstone.%结合青岛某大型桩基工程,通过静载荷试验分析了强风化泥岩地基3根嵌岩打入桩在极限荷载作用下的承载性能.试验结果表明:3根工程桩的Q-s曲线均表现为陡降型,且桩顶沉降量超过40 mm,桩基承载力未达到设计要求.同时,结合标准贯入试验及多根工程桩的静载试验结果,分析得出基桩承载力不足主要是地下水对强风化泥岩的崩解软化作用所致.