中文摘要：

盾构法在地下工程中应用广泛，但其技术系统具有极强的地层适应性差异，需要针对特殊地层进行专门设计。大粒径卵漂石地层是盾构法的世界禁区，迄今为止，国内外适用该种地层的技术系统和成功的工程案例较少。根据大粒径卵漂石地层的力学特征及空间分布规律，采用理论分析与现场验证相结合的手段与方法，系统研究重型刀具与大粒径卵漂石的相互作用机理及盾构开挖过程中刀具与地层的能量传递原理，基于能量原理提出重型刀具的劈裂破岩机理。基于应力波传播理论及黎金格新表面理论，提出盾构在富含超大粒径卵漂石地层中的破岩机理——阻尼环境下重型刀具锤击劈裂破岩；相应推导破岩所需的最小扭矩，为盾构机刀盘装备扭矩选取提供依据；在北京地铁九号线06标“军事博物馆站一东钓鱼台站”盾构区间工程中得到验证，并获得成功应用。研究结果对指导盾构选型、盾构隧道施工及反馈设计具有重要理论与实际意义。

英文摘要：

Although the shield tunnel method has been widely used in the underground construction, the technology system must be revised to adapt to different strata. Therefore special design should he implemented to special strata. The excavation in large size cobble and boulder strata with shield method is still the restricted zone around the world. So far, there are no applicable mature technology systems for such strata and no typical successful cases have been reported. According to the mechanical characteristics and space distribution of the large size cobble and boulder strata, the theoretical analysis and the in-situ measurements are combined to systematically study the interaction mechanism between the heavy-duty cutters and the large size cobbles and boulders, and the energy transmission principle between cutter and strata during the shield tunnel excavation process. Based on the energy principle, the rock breaking mechanism with heavy-duty cutters is proposed. The results obtained are as follows ： （ 1 ） the breaking mechanism of shield tunnelling in large size cobble and boulder strata, i. e. , hammering splitting off the rock under damping environment, is proposed on the basis of the stress wave propagation theory and the Rittinger~ new surface theory ; （2） the formula for calculating the minimum torque required to break the rock is derived, and the design method for shield cutter equipment and rock breakage excavation parameters is built ; （3） the breaking mechanism has been verified in the Beijing subway Line 9 Bid 06, the ＂ Military Museum Station--East Diaoyutai station＂ shield section, in which is the shield tunnel method is successfully applied in the large size cobble and boulder strata. The results can provide reference for the selection of shield type, the shield tunnel construction as well as the feedback design.