Investigation on the lateral anti-seepage capacity of a vertical soil sand layer (VSSL) in a sunken lawn

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL
Zhiqiang Zhang , Zijian Wang , Kunyu Chen , Sheping Wang , Yanping Ding , Yuxiang Huang , Jinsuo Lu
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引用次数: 1

Abstract

The use of a sunken lawn is an emerging Low Impact Development (LID) technique to effectively control storm runoffs. However, the random infiltration of rainwater that occurs due to the construction of a sunken lawn in an area of collapsible loess seriously threatens the safety of buildings around it. Setting up a vertical soil sand layer (VSSL) structure next to a sunken lawn as an anti-permeate method has been proposed in this study. To analyze the lateral anti-seepage effects of a VSSL, a sunken lawn model around a building was established based on soil physical parameters, and water seepage in the sunken lawn was investigated using a infiltration experiment and HYDRUS-2D software. The results show that the anti-seepage effects of a VSSL can significantly reduce the average wetting front migration length and water content at the observation points behind the sand layer. The Nash-Sutcliff Efficiency (NSE) index was used to evaluate the accuracy and reliability of the HYDRUS-2D model. The values of the NSE index obtained were greater than 0.82 (varied between 0.82 and 0.98) which confirmed the applicability of the HYDRUS-2D software in accurately describing the hydraulic behavior of the lateral anti-seepage effects of the VSSL in a sunken lawn. Simulation infiltration tests showed that, on the side of the VSSL, the wetting front migration length was reduced by 55.5% on average, and the water content of the observation points behind the sand layer was reduced by 40.5%, increasing the stability of the loess around the building infrastructure. The results are of value in practical applications, such as for devising engineering or non-engineering measures to avoid loess collapsibility around sunken lawns.

Abstract Image

下沉式草坪垂直土砂层横向防渗能力研究
使用下沉草坪是一种新兴的低影响开发(LID)技术,可以有效地控制暴雨径流。然而,在湿陷性黄土地区修建下陷式草坪会导致雨水随意入渗,严重威胁着周边建筑的安全。本研究提出在下陷草坪旁设置垂直土砂层结构作为防渗方法。为分析VSSL的横向防渗效果,基于土壤物理参数,建立了建筑物周围的下陷草坪模型,采用入渗试验和HYDRUS-2D软件对下陷草坪的渗水情况进行了研究。结果表明:VSSL的防渗作用可显著降低湿锋平均迁移长度和砂层后各观测点的含水率;采用Nash-Sutcliff效率(NSE)指数评价HYDRUS-2D模型的准确性和可靠性。得到的NSE指数值均大于0.82(变化范围在0.82 ~ 0.98之间),证实了HYDRUS-2D软件能够准确描述凹陷草坪中VSSL横向防渗效果的水力特性。模拟入渗试验结果表明,在VSSL一侧,湿锋迁移长度平均缩短55.5%,沙层后观测点含水量平均减少40.5%,增加了建筑基础设施周围黄土的稳定性。研究结果对设计工程或非工程措施防止陷地草坪周围黄土湿陷具有一定的实际应用价值。
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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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