Pile Settlement in Liquefying Sand Deposit
Pile Settlement in Liquefying Sand Deposit
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DOI：
10.1061/(asce)0733-9410(1983)109:9(1165
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发表时间：
1983-09
期刊：
影响因子：
--
通讯作者：
De Alba;A. Pedro
中科院分区：
文献类型：
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作者：
De Alba;A. Pedro
模型研究表明，饱和砂土中端承桩沉降对地震引起的超孔隙压力非常敏感。当桩的安全系数在1.5 ~ 3范围内时，在发生液化之前，沉降相当于桩的破坏。程序中考虑的变量包括有效应力水平、砂的相对密度和应力历史、桩径和安全系数。试验是在一种装置中进行的，该装置的设计目的是使模型桩的尖端能够在高达40 psi （276 kPa）的有效应力水平下插入饱和砂土中。在不排水条件下，通过对砂土施加循环载荷，产生超孔隙压力。对三种直径的桩进行试验，在对设备边界条件进行校正后，表现出一致的行为。因此，这些结果可以作为预测全尺寸桩行为的判断要素。
Model studies have shown that end-bearing pile settlement in a saturated sand deposit is very sensitive to excess pore pressures induced by earthquake shaking. Settlement amounting to pile failure will be reached before liquefaction occurs, for pile safety factors in the 1.5 to 3 range. Variables considered in the program were effective stress level, relative density and stress history of the sand, diameter and safety factor of the pile. Tests were carried out in an apparatus designed so that the model pile tip could be inserted into a saturated sand mass under effective stress levels of up to 40 psi (276 kPa). Excess pore pressures were then induced by applying cyclic load to the sand in undrained conditions. Tests with piles of three diameters showed consistent behavior when corrected for apparatus boundary conditions. These results may therefore serve as an element of judgement in predicting the behavior of full-size piles.