循环荷载下染色标定砂土内部侵蚀试验研究

doi:10.13722/j.cnki.jrme.2021.0305

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摘要内部侵蚀是造成堤防、大坝、路基等诸多结构失稳的主要原因之一。现有对土体内部侵蚀特性的研究大多基于静态加载，且无法定量描述细颗粒迁移的相关规律。为此，采用自主研发的土体渗透试验装置，对2组不同级配的染色标定砂土开展循环荷载作用下的内部侵蚀试验，探究循环荷载下砂土内部侵蚀过程中的水力响应机制，并定量描述流失颗粒的粒径组成及成分来源。试验结果表明：循环荷载–水头作用下，在现有土体稳定性判别方法中表现为稳定土体的试样A仍发生了一定质量的颗粒流失，之后又会达到新的平衡状态；而表现为不稳定土体的试样B则会发生持续且显著的颗粒流失，渗透系数显著增加。随着外部水头的提升，流失颗粒平均粒径逐渐增大、且流失颗粒所来源于土层逐渐加深。循环荷载–水头作用下，砂土试样间产生上下波动的孔隙水压力，在各层位间形成振荡的水力梯度，从而影响土体内部稳定性。研究结果加深了对内部侵蚀特性的认识，为完善相关病害的发展机制研究提供理论与试验支撑。

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	戴邵衡
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关键词 ：土力学, 内部侵蚀, 循环荷载, 染色颗粒, 孔隙水压力

Abstract：Internal erosion is a major cause of failures of many infrastructures such as dikes，embankments and dams. At present，studies on internal erosion of sands fail to consider the influence of cyclic loading and cannot describe the migration of fine particles quantitatively. To this end，a series of cyclic loading-controlled seepage tests were conducted on two dyed sands with different particle size distributions to explore the hydraulic response mechanism during internal erosion，and to describe the particle size distribution and the detailed amount of the lost particles after the tests. The results show that with the coupling effect of cyclic loading and ascending water head，specimen A，evaluated to be stable by soil stability assessment methods in the literature，presents a certain amount of particle loss and then reaches a new equilibrium state，while specimen B assessed to be unstable continues to lose fine particles accompanied by the permeability coefficient increasing. It is also indicated that the average particle size of the migrated particles tends to be greater and the depth of the migrated particles tends to be larger with increasing the hydraulic gradient. Under the coupling action of the cyclic loading and the water head，the pore water pressure in sand specimens fluctuates，forming an oscillating hydraulic gradient and therefore affecting the internal stability of the soil samples. The research results deepen the understanding of the internal erosion characteristics of sands and provide theoretical and experimental support for studing the development mechanism of related diseases.

Key words： soil mechanics internal erosion cyclic loading dyeing particles pore water pressure

引用本文:

戴邵衡，张升，童晨曦，卢静，高峰. 循环荷载下染色标定砂土内部侵蚀试验研究[J]. 岩石力学与工程学报, 2022, 41(2): 423-432.
DAI Shaoheng，ZHANG Sheng，TONG Chenxi，LU Jing，GAO Feng. Experimental study on internal erosion of dyed sands under cyclic loading. , 2022, 41(2): 423-432.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0305 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I2/423

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