Study on the formation and dewatering process of the surface filter cake of geotextile on the lateral boundary of geotextile tubes under constant flow grouting

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-07-31 DOI:10.3389/feart.2024.1427659

Mingqiang Sheng, Qixin Zhu, Faming Huang, Chun Zou, Yang Gao, Xinxin Liu

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Abstract

In this article, physical model test and numerical simulation are used to study the formation of filter cake and the filtration performance of the geotextile on the lateral boundary of the ultra-fine tailings grouting geotextile tubes from macro and micro levels. At the macro level, the effects of different grouting flow rates and tailings slurry mass concentrations on the surface filter cake formation and the dehydration performance of geotextile on the lateral boundary of the geotextile tubes were analyzed. At the micro level, the use of CFD-DEM method for fluid and particle of two-way coupling numerical simulation research, lateral drainage boundary of superfine tailings in tubes filter cake forming process is analyzed. The research shows that the increase of grouting flow rates and tailings slurry mass concentrations will make the thickness of filter cake great and the structure more compact, which will lead to more serious silting of the surface layer of geotextile and greatly reduce the dehydration performance; The numerical simulation results regularity is consistent with the results regularity of physical model test on the formation of filter cake on geotextile surface of geotextile tubes: the larger the slurry inlet speed and particles concentrations, the more complete the formation of filter cake on geotextile surface, the denser the cake structure, and the less tailings loss. By studying the effects of grouting flow rates and slurry mass concentrations on the surface filter cake formation and tubes dehydration, this article aims to find suitable slurry filling construction conditions and explore the main influencing factors caused by dehydration and consolidation of ultra-fine tailings grouting geotextile tubes, so as to provide some help for the subsequent flocculating of ultra-fine tailings to solve the problem of surface drying and internal wetting of geotextile tubes.

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恒流灌浆条件下土工布管横向边界上土工布表面滤饼的形成和脱水过程研究

本文采用物理模型试验和数值模拟的方法，从宏观和微观两个层面研究了超细尾矿注浆土工布管横向边界上滤饼的形成和土工布的过滤性能。在宏观层面，分析了不同灌浆流速和尾矿浆液质量浓度对土工布管横向边界表面滤饼形成和土工布脱水性能的影响。在微观层面，利用CFD-DEM方法进行流体与颗粒的双向耦合数值模拟研究，对管内超细尾矿侧向排水边界滤饼形成过程进行了分析。研究表明，灌浆流速和尾矿浆液质量浓度的增加会使滤饼厚度增大，结构更加紧密，导致土工布表层淤积更加严重，脱水性能大大降低；数值模拟结果规律性与土工布管土工布表面滤饼形成的物理模型试验结果规律性一致：浆液进口速度和颗粒浓度越大，土工布表面滤饼形成越完全，滤饼结构越致密，尾矿流失越少。本文通过研究注浆流速和浆液质量浓度对表面滤饼形成和管体脱水的影响，旨在寻找合适的注浆施工条件，探讨超细尾矿注浆土工布管体脱水固结的主要影响因素，为后续超细尾矿絮凝解决土工布管体表面干燥和内部湿润问题提供一定的帮助。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.