A preliminary study on the piping erosion of soils using glucose dissolution method

A preliminary study on the piping erosion of soils using glucose dissolution method
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葡萄糖溶解法对土壤管道侵蚀的初步研究

DOI:
10.1007/s12665-017-7191-7
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发表时间:
2018-01
影响因子:
2.8
通讯作者:
Chao Xu
Chao Xu
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Yang Yang;Reiko Kuwano;Chao Xu

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管道侵蚀土结构破坏会造成灾难性的后果和巨大的经济损失。管道的室内模拟对侵蚀土壤的研究具有重要意义。目前,对管道侵蚀的模拟方法主要有人工开槽和钻孔等。本文是这种努力的延续,并提出了一种新的方法,通过溶解预先安装在测试材料内的葡萄糖柱来重现管道侵蚀。通过一系列不同密度和围压下的三轴压缩试验对该方法进行了验证,旨在确定管道侵蚀过程中刚度损失与颗粒溶解之间的关系。在局部传感器的帮助下,获得了管道扩展过程中的体积应变和土壤在侵蚀后状态下的小应变刚度。结果表明,管道侵蚀对土体的杨氏模量和泊松比有明显的破坏作用,而受扰动试件的整体抗剪强度受影响较小。
Piping erosion-induced earthen structure failures can cause catastrophic consequences and great economic loss. Experimental laboratory simulation of piping plays a key role for the study of eroded soils. Up till now, piping erosion has been simulated in different ways, such as artificial slot or drilled hole. This paper is a continuation of such efforts and presents a new method of reproducing piping erosion by dissolution of preinstalled glucose column inside the tested material. The proposed method was examined through a series of triaxial compression tests under different densities and confining pressures, aiming to identify the association between stiffness loss and particle dissolution during piping erosion. With the help of local sensors, volumetric strains during piping propagation and small strain stiffness of soil at post-erosion state were obtained. Results showed significant degradation of Young’s modulus and Poisson’s ratio in soil subjected to piping erosion, while the overall shear strength of the disturbed specimens appeared to be less affected.
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