毛细阻滞覆盖层储水能力和击穿时间试验研究

doi:10.13722/j.cnki.jrme.2021.0839

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摘要毛细阻滞覆盖层目前在干旱、半干旱地区应用较成熟，但缺乏在湿润地区服役性能和设计准则的研究。为了明确毛细阻滞覆盖层在连续降雨作用下的服役性能，通过土柱降雨入渗试验，研究毛细阻滞覆盖层储水能力和击穿时间与降雨强度、细粒土层厚度和初始含水率的关系。试验结果表明：(1) 降低细粒土层初始含水率、提高细粒土层厚度均有助于提升储水能力；(2) 在试验厚度及含水率范围内，击穿时间随细粒土层初始含水率的降低和厚度的提高而线性增加，与降雨强度呈幂函数负相关关系，在饱和渗透系数附近，击穿时间随降雨强度的增长由迅速降低变为缓慢降低；(3) 极端连续降雨条件下，毛细阻滞覆盖层的入渗速率首先由降雨强度控制，最终趋于饱和渗透系数，该过程可用等效入渗速率描述，降雨强度、初始含水率对等效入渗速率具有显著影响。基于试验结果，提出了毛细阻滞覆盖层的实用储水能力模型，推导了击穿时间的半经验–半理论计算模型，储水能力和击穿时间模型计算结果均与试验结果吻合，可作为毛细阻滞覆盖层在连续降雨条件下的设计依据。研究结果可为毛细阻滞覆盖层在湿润地区和极端降雨情况下的设计和维护提供参考。

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	李晓康1
	李旭1
	王菲1
	2
	刘阿强1
	刘丽1
	刘艳1

关键词 ：土力学, 毛细阻滞覆盖层, 连续降雨, 储水能力, 击穿时间, 土柱试验

Abstract：The capillary barrier cover is maturely used in arid and semi-arid areas，but its service performance and design criteria in humid areas are less studied. In order to clarify the service performance of the capillary barrier cover under continuous rainfall，the relationships between the water storage capacity and the breakthrough time of the capillary barrier cover with the rainfall intensity，the thickness and the initial moisture content of the fine-grained soil layer were studied through the soil column infiltration test. The test results show that：(1) Decreasing the initial water content and increasing the thickness of the fine-grained layer can increase the water storage capacity. (2) Within the range of test thickness and moisture content，the breakthrough time decreases linearly with decreasing the initial water content while with increasing the fine layer thickness，and has a negative power function relationship with the rainfall intensity. Near the saturated permeability coefficient，the breakthrough time changes from a rapid decrease to a slow decrease with increasing the rainfall intensity. (3) Under extreme continuous rainfall，the infiltration rate of the capillary barrier cover is first controlled by the rainfall intensity，and finally tends to saturated permeability coefficient. This process can be described by the equivalent infiltration rate，which is significantly affected by the rainfall intensity and the initial water content. Based on the test results，a practical water storage capacity model and a semi-empirical theoretical model of the breakthrough time were proposed. The calculation results of the models are consistent with the test results，which illustrates that the proposed models can be used as the basis for the design of the capillary barrier cover in continuous rainfall. The research results can provide references for the design and maintenance of capillary barrier cover in humid areas and extreme rainfall conditions.

Key words： soil mechanics capillary barrier cover continuous rainfall water storage capacity breakthrough time；soil column test

引用本文:

李晓康1，李旭1，王菲1，2，刘阿强1，刘丽1，刘艳1. 毛细阻滞覆盖层储水能力和击穿时间试验研究[J]. 岩石力学与工程学报, 2022, 41(7): 1501-1511.
LI Xiaokang1，LI Xu1，WANG Fei1，2，LIU Aqiang1，LIU Li1，LIU Yan1. Experimental study on water storage capacity and breakthrough time of capillary barrier cover. , 2022, 41(7): 1501-1511.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0839 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I7/1501

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