Investigating the internal erosion behavior and microscopic mechanisms of chemically stabilized soil: an experimental study

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-08-27 DOI:10.3389/feart.2024.1452449

Buping Zhang, Xinghua Zhu, Xuewen Tao, Mengkui Wang, Aamir Asghar, Guoliang Mi

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引用次数: 0

Abstract

IntroductionInternal erosion triggered by water pipeline leaks seriously threatens the stability of the urban ground. Hangzhou, a city in Zhejiang Province, China, is facing critical challenges due to urban ground collapse (UGC) caused by internal erosion. However, there is a lack of research on the prevention of UGC by improving the internal erodibility of underground soil. Addressing this issue is of utmost importance to ensure the city’s stability and safety. This paper proposes to improve the internal erodibility of typical sandy silt soils with chemical stabilisers.MethodsThe effects of three chemical stabilisers, lignosulphonate (LS), lime (LI), and lignin fibre (LF), on the critical shear stress (τc) and erosion coefficient (kd) of sandy silt soils were investigated, which from Hangzhou, Zhejiang, China, by the hole erosion test (HET) at different mixing amounts and at different conservation times.ResultsThe findings indicate that LF mainly improves the erosion resistance of sandy silt by increasing τc, and the maximum increase is 2.38 times; LI mainly improves the erosion resistance by decreasing kd, and the maximum decrease is 2.18 times. After adding LS, τc and kd did not change significantly. The scanning electron microscope (SEM) test revealed that the inclusion of LF led to the formation of larger agglomerates in the sandy silt soil. The microstructure of sandy silt soil remained dispersed even after adding LS. Various chemical stabilisers used to improve sandy silt soils exhibited distinct erosion mechanisms. Sandy silt soils improved with LF exfoliated into agglomerates, displaying high resistance to erosion. On the other hand, the sandy silt treated with LF still lacks a protective layer and shows minimal improvements in its ability to withstand erosion. In contrast, the LS-amended sandy silt remains stripped with individual soil particles with insignificant changes in erosion resistance.DiscussionThis study can provide a conceptual framework for choosing foundation treatment techniques in future urban development projects.

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调查化学稳定土壤的内部侵蚀行为和微观机制：一项实验研究

导言输水管道泄漏引发的内侵蚀严重威胁着城市地面的稳定性。中国浙江省杭州市正面临着由内侵蚀引发的城市地面塌陷（UGC）的严峻挑战。然而，关于通过改善地下土壤内部侵蚀性来预防城市地面塌陷的研究却十分匮乏。解决这一问题对于确保城市的稳定和安全至关重要。方法通过孔侵蚀试验（HET）研究了木质素磺酸盐（LS）、石灰（LI）和木质素纤维（LF）这三种化学稳定剂在不同掺量和不同养护时间下对中国浙江杭州砂质粉土临界剪应力（τc）和侵蚀系数（kd）的影响。结果表明，LF 主要通过增加 τc 来提高砂质粉土的抗侵蚀性，最大增幅为 2.38 倍；LI 主要通过降低 kd 来提高抗侵蚀性，最大降幅为 2.18 倍。加入 LS 后，τc 和 kd 变化不大。扫描电子显微镜（SEM）测试显示，加入 LF 后，砂质粉土中形成了较大的团聚体。即使添加了 LS，砂质粉土的微观结构仍然很分散。用于改良砂质粉土的各种化学稳定剂表现出不同的侵蚀机制。用 LF 改良过的砂质粉土会剥落成团块，表现出很强的抗侵蚀能力。另一方面，用 LF 处理过的砂质粉土仍然缺乏保护层，抗侵蚀能力的改善微乎其微。与此相反，经 LS 改良的砂质粉土仍然是由单个土壤颗粒剥离而成，抗侵蚀能力变化不大。

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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.