Internal erosion process and its influence factors in widely graded loose soils due to rainfall infiltration

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-16 DOI:10.3389/feart.2024.1418293

Li Liang, Da-Lang Tian, Zheng-Chuan Li

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引用次数: 0

Abstract

Compared with engineering materials for earth structures subjected to prolonged, sustained hydraulic loading, the internal erosion process of widely graded loose soils (WGLS) under short-term, fluctuating hydraulic loading conditions remains insufficiently elucidated. Therefore, a novel fixed-wall permeameter is developed, capable of applying hydraulic loading at a constant flow rate and collecting effluent flowing out of specimens. A testing protocol is proposed to separate eroded silty clay particles, sandy gravel particles, and seepage water from the collected effluent. Several seepage tests are conducted on remolded specimens with various initial porosity at different inflow rates. The test results show that under a constant inflow rate, the WGLS specimens may undergo suffusion, suffosion, and stabilization stages while seeking the ultimate equilibrium state. The proposed particle migration pattern adeptly reveals the microscale mechanisms of the internal erosion phenomena observed at different stages. The inflow rate is independent of the suffusion critical hydraulic gradient but impacts the suffosion critical hydraulic gradient and internal erosion behavior following suffusion. Because hydraulic shear stress is a comprehensive indicator that considers both hydraulic gradient and initial porosity, it is more appropriate to use it to evaluate the internal stability potential of WGLS.

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降雨入渗导致的宽阶松土内部侵蚀过程及其影响因素

与承受长期、持续水力荷载的土体结构工程材料相比，广泛分级松土（WGLS）在短期、波动水力荷载条件下的内部侵蚀过程仍未得到充分阐明。因此，我们开发了一种新型固定壁渗透仪，能够以恒定流速施加水力荷载，并收集从试样中流出的污水。提出了一种测试方案，以从收集到的流出物中分离出侵蚀的淤泥质粘土颗粒、砂质砾石颗粒和渗水。在不同流入率下，对具有不同初始孔隙率的重塑试样进行了多次渗流试验。试验结果表明，在恒定的流入率下，WGLS 试样在寻求最终平衡状态的过程中可能会经历窒息、窒息和稳定阶段。所提出的粒子迁移模式很好地揭示了不同阶段所观察到的内侵蚀现象的微观机制。流入率与淤积临界水力梯度无关，但会影响淤积临界水力梯度和淤积后的内侵蚀行为。由于水力剪应力是一个综合指标，同时考虑了水力梯度和初始孔隙度，因此用它来评价 WGLS 的内部稳定性潜力更为合适。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.