A new method of sampling in sensitive clay
A new method of sampling in sensitive clay
复制标题
敏感粘土取样新方法
DOI：
10.1139/t79-019
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
C. Poulin
中科院分区：
文献类型：
--
作者：
G. Lefebvre;C. Poulin
最近关于取样技术影响的许多出版物表明，一般而言，取样质量随取样设备直径的增加而提高。然而，所有的研究也得出结论，即使是大直径的采样器在市场上可大大损坏的结构的粘土加拿大东部，相比，通过块采样获得的样品质量。除了与块体取样所需的沟槽的挖掘相关的困难之外，块体取样的深度是有限的，至少在软粘土中是如此，本文中描述的取样技术允许从地面工作并使用与用于常规块体取样的切割方法非常相似的方法来检索深块体。大直径钻孔用水或膨润土泥浆填充，以减少底部隆起的可能性。通过与无侧限抗压试验结果的对比表明，该方法所获得的试样具有良好的抗压强度。
Many recent publications on the influence of sampling techniques indicate that, generally speaking, the quality of the samples increases with the diameter of the sampling equipment. However, all studies also conclude that even the large diameter samplers available on the market substantially damage the structure of the clays of eastern Canada, as compared to the sample quality obtained by block sampling. In addition to the difficulties associated with the excavation of the trenches necessary for block sampling, the depth of block sampling is limited, at least in soft clays.The sampling technique described in the present paper allows the retrieval of deep blocks, working from the ground surface and using a cutting method quite similar to that used for conventional block sampling. The large diameter borehole is filled with water or bentonite slurry to reduce the possibility of bottom heave. By comparing the results of unconfined compression tests it is shown that the samples obtained by this method are of a...