PFC3D-FLAC3D耦合模拟EPB盾构施工影响分析

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"这篇SCI文章探讨了使用PFC3D和FLAC3D软件耦合的数值方法在分析EPB盾构隧道施工过程中引发的土压、机器参数和地表沉降响应。研究通过PFC3D模拟不同室内排放比的盾构隧道掘进情况,而FLAC3D用于模拟周围地层。结果揭示了前盾压力随盾构掘进呈周期性变化,并与排放比成负相关;盾构舱内左右两侧及不同纵向位置的压力差受到排放比的影响;此外,排放比与盾构推力和切削头扭矩在开挖过程中也存在负相关关系;最后,正向地层损失对地表沉降的影响大于负向地层损失。" 本文是一篇深入探讨地球压力平衡(EPB)盾构法隧道建设的科学研究。作者通过将颗粒流计算程序(PFC3D)与有限差分法(FLAC3D)结合,构建了一种高效的数值仿真方案,旨在理解和预测盾构施工中的各种复杂现象。PFC3D是基于离散元素方法(DEM)的软件,常用于模拟土壤和岩石颗粒的行为,而FLAC3D则适用于模拟连续介质的地下结构行为。这种耦合方法允许对地层和隧道结构进行精细化建模,以获得更准确的分析结果。 研究中,作者关注的关键变量是排放比,即在盾构舱内排出渣土与进入舱内的新土之间的比例。通过改变这个比例,他们观察到前盾(即盾构机前端的密封部分)附近的压力变化,发现这些压力呈周期性波动,并且随着排放比的增加而减小。这一发现对于优化盾构操作和防止过大的土压波动具有重要意义,因为过高的压力可能会影响机器性能和地面稳定性。 同时,研究还指出,排放比的变化直接影响盾构推力和切削头扭矩。较低的排放比可能导致更大的推力和扭矩需求,这可能会对机器造成额外的磨损,影响施工效率,甚至可能威胁到施工安全。因此,理解这些参数之间的关系对于优化盾构机的操作参数至关重要。 最后,文章提到正向和负向地层损失对地表沉降的影响。正向地层损失指的是在掘进过程中土体被带入盾构舱,而负向地层损失则是土体在开挖后被留在原地。研究表明,正向地层损失导致的地表沉降更大,这为优化盾构掘进策略提供了新的视角,如控制土体处理方式以减少地表沉降。 这篇研究揭示了EPB盾构法施工中多个关键参数之间的相互作用,为工程实践提供了有价值的理论支持,有助于改进盾构隧道的设计和施工过程,减少对周围环境的影响。通过PFC3D和FLAC3D的耦合应用,未来可以进一步探索更多复杂地质条件下的盾构施工问题。

翻译 This is Elsevier's new document class for typeset journal articles, elsarticle.cls. It is now accepted for submitted articles, both in Elsevier's electronic submission system and elsewhere. Elsevier's previous document class for typeset articles, elsart.cls, is now over 10 years old. It has been replaced with this newly written document class elsarticle.cls, which has been developed for Elsevier by the leading TeX developer STM Document Engineering Pvt Ltd. elsarticle.cls is based upon the standard LaTeX document class article.cls. It uses natbib.sty for bibliographical references. Bugs and problems with elsarticle.cls may be reported to the developers of the class via elsarticle@stmdocs.in. The file manifest.txt provides a list of the files in the elsarticle bundle. The following are the main files available: - elsarticle.dtx, the dtx file - elsdoc.pdf, the user documentation - elsarticle-template-num.tex, template file for numerical citations - elsarticle-template-harv.tex, template file for name-year citations - elsarticle-template-num-names.tex, template file for numerical citations + new natbib option. Eg. Jones et al. [21] - elsarticle-num.bst, bibliographic style for numerical references - elsarticle-harv.bst, bibliographic style for name-year references - elsarticle-num-names.bst, bibliographic style for numerical referencces + new natbib option for citations. To extract elsarticle.cls from *.dtx: latex elsarticle.ins The documentation file is elsdoc.tex in the contrib directory. To compile it: 1. pdflatex elsdoc 2. pdflatex elsdoc 3. pdflatex elsdoc

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用中文总结以下内容: A number of experimental and numerical investigations have been conducted to study the MBPP stack and wavy flow field characteristics with various designs [10,11]. T. Chu et al. conducted the durability test of a 10-kW MBPP fuel cell stack containing 30 cells under dynamic driving cycles and analyzed the performance degradation mechanism [12]. X. Li et al. studied the deformation behavior of the wavy flow channels with thin metallic sheet of 316 stainless steel from both experimental and simulation aspects [13]. J. Owejan et al. designed a PEMFC stack with anode straight flow channels and cathode wavy flow channels and studied the in situ water distributions with neutron radiograph [14]. T. Tsukamoto et al. simulated a full-scale MBPP fuel cell stack of 300 cm2 active area at high current densities and used the 3D model to analyze the in-plane and through-plane parameter distributions [15]. G. Zhang et al. developed a two-fluid 3D model of PEMFC to study the multi-phase and convection effects of wave-like flow channels which are symmetric between anode and cathode sides [16]. S. Saco et al. studied the scaled up PEMFC numerically and compared straight parallel, serpentine zig-zag and straight zig-zag flow channels cell with zig-zag flow field with a transient 3D numerical model to analyze the subfreezing temperature cold start operations [18]. P. Dong et al. introduced discontinuous S-shaped and crescent ribs into flow channels based on the concept of wavy flow field for optimized design and improved energy performance [19]. I. Anyanwu et al. investigated the two-phase flow in sinusoidal channel of different geometric configurations for PEMFC and analyzed the effects of key dimensions on the droplet removal in the flow channel [20]. Y. Peng et al. simulated 5-cell stacks with commercialized flow field designs, including Ballard-like straight flow field, Honda-like wavy flow field and Toyota-like 3D mesh flow field, to investigate their thermal management performance [21]. To note, the terms such as sinusoidal, zig-zag, wave-like and Sshaped flow channels in the aforementioned literatures are similar to the so called wavy flow channels in this paper with identical channel height for the entire flow field. The through-plane constructed wavy flow channels with periodically varied channel heights are beyond the scope of this paper [22,23].

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