强风化嵌岩大直径钻孔灌注桩单桩承载性状试验分析

TEST ANALYSIS OF BEARING CAPACITIES OF LARGE-DIAMETER BORED CAST-IN-PLACE PILE EMBEDDED IN SEVERELY WEATHERED ROCK

为探讨大直径嵌岩灌注桩的承载性状,进行了单桩静载荷试验;试验表明,大直径嵌岩桩的荷载-沉降曲线呈缓变型,无明显的极限荷载特征点,承载力应由位移控制;多种方法拟合结果的比较表明,逆斜率法拟合的结果与实测数据最接近,其拟合曲线可用于单桩承载特性的分析,也可用于单桩承载力的确定。

To discuss the bearing capacities of a large-diameter bored cast-in-place pile embedded in the severely weathered rock,the in-site load tests were made.The test results shown that the load-settlement relations presented the gradually varied morphological characters,and there was no characteristic points on the limited capacity,the pile loading capacity should be determined by the settlement of the pile.Various fitted regression equations were used for the data of actual measurement,and the inverse slope method given the best results.The fitted equation could be used for the analysis of the characteristic of the pile,and the loading capacity of single pile.