应力条件对不同特性细粒土抗集中渗漏侵蚀性的影响

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Sadettin Topçu, Hasan Savaş, Hasan Tosun
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引用次数: 0

摘要

内侵蚀是导致堤坝等挡水土体结构坍塌的最重要因素之一。集中渗漏侵蚀是内部侵蚀的一种形式,发生在开裂的细粒土和压力流条件下。要评估裂缝/空洞的集中渗漏侵蚀风险,就必须确定这些材料的抗侵蚀能力。侵蚀速率和临界剪应力决定了集中渗漏侵蚀的内部抗侵蚀性。本研究使用测试设备测定土壤的抗集中渗漏侵蚀性,该设备允许水流在无应力(无负载)、各向异性压缩应力、各向异性膨胀应力和各向同性应力条件下通过孔洞。样品孔壁发生侵蚀的应力是通过数值建模确定的,作为实验前的应力条件。实验是在四个选定的具有不同侵蚀敏感性的粘性土壤的单一水头下进行的。试验系统获得的随时间变化的流量可用于确定水力参数,如理论水力模型中的管道水力基本定理。此外,还利用连续性方程定量确定了侵蚀速率,并定性比较了通过分散机制形成的集中泄漏侵蚀的临界剪切应力。实验结果表明,应力条件会影响分散侵蚀土样的集中泄漏侵蚀阻力。此外,莫尔-库仑假说中的剪切强度可以解释这些土壤在应力条件下的抗侵蚀性,具体取决于砂/粘土比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of stress conditions on concentrated leak erosion resistant of fine-grained soils with different characteristics

Effect of stress conditions on concentrated leak erosion resistant of fine-grained soils with different characteristics

Internal erosion is one of the most important factors that cause earth structures that retain water, such as embankment dams, to collapse. Concentrated leak erosion, one of the forms of internal erosion, occurs in cracked fine-grained soils and pressurized flow conditions. To evaluate the concentrated leak erosion risk of cracks/voids, it is necessary to ascertain the erosion resistance of these materials. The erosion rate and critical shear stresses determine internal erosion resistance in concentrated leak erosion. This study determined soil’s concentrated leak erosion resistance using test equipment that allowed the flow to pass through a hole with stress-free (no loading), anisotropic-compression stress, anisotropic-expansion stress, and isotropic stress conditions. The stresses that developed in the samples’ hole wall where erosion occurred were determined with numerical modeling as pre-experimental stress conditions. The experiments were performed under a single hydraulic head on four selected cohesive soils with different erosion sensitivity. Time-dependent flow rates obtained from the test system can be used to determine hydraulic parameters, such as energy grade lines, with the help of basic theorems of pipe hydraulics in theoretical hydraulic models. Moreover, the erosion rates were quantitatively determined using the continuity equation, while critical shear stresses were qualitatively compared for concentrated leak erosion developed by the dispersion mechanism. As a result of the experiments, stress conditions influence the concentrated leak erosion resistance in the soil samples with dispersive erosion. Moreover, the shear strength in the Mohr–Coulomb hypothesis can explain the erosion resistance in these soils under stress conditions depending on the sand/clay ratio.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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