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土压平衡盾构在自稳性较差的砂土地层施工时若仓内支护压力过小可能诱发掌子面失稳,应引起高度重视。采用三维离散元方法分析了砂土地层土压盾构掘进与停机状态下的掌子面稳定性。研究建立了较为精细的土压盾构机模型并引入盾构动态施工过程,充分考虑了刀盘旋转切削土体与面板支撑对掌子面的影响,探讨了刀盘型式、隧道埋深以及刀盘转速等因素对掌子面极限支护压力与失稳区分布的影响规律,并从细观角度解释了砂土地层土压盾构隧道掌子面失稳机理。与既有研究相比,本文考虑了土压盾构动态施工对掌子面稳定性的影响,更加接近工程实际,研究成果可为确保砂土地层土压盾构隧道施工掌子面稳定提供参考。
Earth pressure balance shield in the self-stability of the sand soil stratum construction if the support pressure within the warehouse is too small may be induced face instability, should be highly valued. The three-dimensional discrete element method was used to analyze the stability of the excavation face under the earth pressure shield and the shutdown status. In this paper, a more elaborate model of earth pressure shield machine is established and the dynamic construction process of the shield is introduced. The influence of cutter body and panel support on the face of the face is fully considered. The cutterhead type, tunnel depth, Plate rotation speed and other factors on the palm support surface pressure and instability zone distribution of the impact of law, and from a microscopic point of view of the earth pressure shield tunnel sand surface instability mechanism. Compared with the previous studies, this paper considers the influence of dynamic construction of earth pressure shield on the stability of the face and closer to the actual project, and the research results can provide reference for ensuring the stability of the face of the earth pressure shield tunnel construction .