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用砼桩在墨西哥城粘土中进行贯入及拉拔试验,试验结果揭示出若干重要的摩擦,桩特性。首先,桩的最大贯入承载力取决于加荷速率,加荷速率越高,承载力越大。第二,加荷速率对荷载——位移曲线的平均斜率也有类似的影响。第三,虽然拉拨摩擦力的最大值和贯入摩擦力的最大值相等,但是贯入荷载——位移曲线和拉拨荷载——位移曲线并不相同。最后,对于墨西哥城粘土,用于计算摩擦桩承载力的参数α的数值为1.2。
The penetration and pull-out tests were carried out in Mexico clay using rammed piles. The test results revealed several important friction and pile characteristics. First, the maximum penetration bearing capacity of the pile depends on the loading rate. The higher the loading rate, the greater the bearing capacity. Second, the loading rate has a similar effect on the average slope of the load-displacement curve. Third, although the maximum value of the frictional friction force and the maximum value of the penetration friction force are equal, the displacement load curve—displacement curve and pull load—displacement curve are not the same. Finally, for Mexico City clay, the value of the parameter α used to calculate the friction pile bearing capacity is 1.2.