CAJ | 학술논문

采用颗粒流方法合理地模拟泥水盾构隧道掘进的全过程及对模拟结果的有效处理是一个难点。基于钱江隧道和上海长江隧道工程复杂地层条件，建立能全面反映盾构隧道掘进全过程的模拟实现方法，并在结果处理中采用细观尺度与宏观表象相结合方法，研究宏观现象下隐藏的细观机制，同时用定量的细观结构变化解释或预测宏观力学行为。研究结果表明：通过设计，颗粒流方法可合理并有效地模拟盾构推进过程中的开挖问题，即开挖量与土体的密实度及开挖面压力有关：当土颗粒刚度大于模拟开挖面的墙体单元刚度时，表示该压力下土体被开挖掉；反之，压力过小盾构机将停止掘进。研究成果在应用于背景工程中取得了良好的一致性，可为类似工程提供参考。
채용과립류방법합리지모의니수순구수도굴진적전과정급대모의결과적유효처리시일개난점。기우전강수도화상해장강수도공정복잡지층조건，건립능전면반영순구수도굴진전과정적모의실현방법，병재결과처리중채용세관척도여굉관표상상결합방법，연구굉관현상하은장적세관궤제，동시용정량적세관결구변화해석혹예측굉관역학행위。연구결과표명：통과설계，과립류방법가합리병유효지모의순구추진과정중적개알문제，즉개알량여토체적밀실도급개알면압력유관：당토과립강도대우모의개알면적장체단원강도시，표시해압력하토체피개알도；반지，압력과소순구궤장정지굴진。연구성과재응용우배경공정중취득료량호적일치성，가위유사공정제공삼고。
It is difficult to properly simulate the whole excavation process during slurry shield tunneling and also to exactly explain its corresponding modeling results. Combined with the complex ground condition in Qianjiang tunnel and Shanghai Yangtze tunnel,the paper suggests a more comprehensive numerical simulation method to describe the characteristic of the whole tunneling process,and with respect to the modeling results handling,the mechanical property and its microscopic structure are connected to quantitatively analyze the face failure mechanism and estimate the mechanical behavior step-by-step. The main results show that:the discrete numerical approach can be considered as an effective way to model the excavation problem for the whole slurry shield process;for example,the volume of excavated soil is well proportional to the soil density and the pressure exerted on excavation face,i.e.,when the stiffness of the particle is larger than that of the wall,then soil is excavated under the pressure;contrariwise,the shield stops tunneling. The research results are well applied to the background projects and good results are achieved;and the established particle flow code(PFC) approach for the whole tunneling process also provides a reference for similar projects.