Effect of preloading on post-construction consolidation settlement of soft clay subjected to repeated loading
Effect of preloading on post-construction consolidation settlement of soft clay subjected to repeated loading
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DOI：
10.3208/sandf1972.30.76
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发表时间：
1990-03
影响因子：
3.7
通讯作者：
H. Fujiwara;S. Ue
中科院分区：
文献类型：
--
作者：
H. Fujiwara;S. Ue
软土地基在反复荷载作用下的性状不同于在持续荷载作用下的性状。这两种加载模式之间的沉降差异应该是由于长时间的二次压缩。因此，软粘土地基经受反复荷载往往比经受持续荷载的地基更易压缩。因此，有必要对重复荷载作用下的工后沉降进行预测。在这方面，预压被认为是一种有前途的对策，以减少在重复加载以及持续加载下的粘土沉降。本文研究了卸荷后反复荷载作用下预压对软粘土工后固结沉降的影响。试验结果表明，预固结后土样的沉降主要受预压量、预压固结度、永久荷载量和去除预压后的重复荷载量的影响。采用一种估算卸荷后反复荷载作用下软土地基固结沉降量的方法，将计算得到的沉降时间关系与观测到的固结度进行了比较，并以此作为预压强度和反复荷载强度的参数。
The behavior of the soft clay grounds subjected to repeated loading is different from that subjected to sustained loading. The difference in settlement between these two loading patterns should be due to secondary compression over a long period of time. Consequently, soft clay grounds subjected to repeated loading tend to be more compressible than those subjected to sustained loading. Therefore, it is necessary for engineers to predict post-construction settlements under repeated loading. In this respect, the preloading is considered to be promising as a countermeasure to reduce the settlement of clay under repeated loading as well as under sustained loading. The effect of preloading on post-construction consolidation settlement of soft clay subjected to repeated loading after removal of a part of preload is investigated in the present paper. It has become clear that the settlement of a clay sample after preconsolidation is mainly affected by the amount of preload, the degree of consolidation due to the preload, the amount of permanent load and the amount of repeated load after removal of preload. The calculated settlement versus time relations using a method to estimate the amount of consolidation settlement of soft clay grounds subjected to repeated loading after removal of preloading were compared with the observed degree of consolidation as parameters of the intensities of preload and repeated load.