出口几何形状可变条件下双层堤基逆向侵蚀管道的试验研究

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

摘要

双层堤地基由弱透水性的上覆粘土层和高透水性的下覆砂层组成,是堤防工程中最常见的地层类型之一,发生灾害性破坏的概率最高,其主要危害是后向侵蚀管道。现有的双层堤基逆向侵蚀管道研究没有充分考虑出口对侵蚀过程的影响。因此,采用自行设计的试验装置来评估不同出口的尺寸、位置和类型的影响,并通过出口区域将圆形出口与槽形出口连接起来,探讨不同出口几何条件下的临界识别条件和管道向上游方向的发展机理。结果表明,出口所承受的局部和全局水力梯度均与出口面积成反比,且受出口位置的影响较小。槽形出口管道的发展过程与圆形出口管道不同,通常是在靠近上游端的出口两角交替发展,然后汇聚成一条管道。管道的平均深度和宽度与出口尺寸和渗流长度成正比。随着槽形出口平均管道面积的增加,水头增加后管道发展更快,对堤坝基础的破坏也会增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on backward erosion piping of a double-layer dike foundation under variable exit geometries

Double-layer dike foundation is composed of a weakly permeable overlying clay layer and a highly permeable underlying sand layer, which is one of the most common stratum types in dike engineering with the highest probability of catastrophic damage, and the main danger is backward erosion piping. Existing research on backward erosion piping of double-layer dike foundation has not fully considered the influence of the exit on the erosion process. Therefore, a self-designed test device is used to assess the influences of the size, position and type of different exits, and the circular exit is connected with the slot exit via the exit area to explore the critical identification conditions and the pipe development mechanism toward the upstream direction under different exit geometry conditions. The results show that both the local and global hydraulic gradients borne by the exit are inversely proportional to the exit area and are less notably affected by the location of the exit. The development process of slot exit pipes differs from that of circular exit pipes, and pipes are usually developed alternately at the two corners of the exit near the upstream end and then converge into one pipe. The average pipe depth and width are proportional to the exit size and the seepage length. With increasing average pipe area of the slot exit, pipes develop more rapidly after head enhancement, and the damage to the dike foundation increases.

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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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