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在各种复杂环境下采用泥水盾构法修建隧道工程,需要解决在开挖面上如何及时形成安全有效的泥膜支护问题。采用修正的剑桥模型中正常固结黏土各向等压固结曲线规律,建立泥膜固含率与有效应力之间的关系,结合圆球形颗粒孔隙理想模型的渗透率以及泥膜固含率、渗透率和比阻三者之间的关系,确立新的泥膜形成本构关系模型。将泥膜形成一维模型拓展为二维模型,基于增量分析方法分析泥膜的增长规律,给出泥膜滤失量和厚度分别与位置、时间、重度比和盾构直径等因素的关系。结果表明,修正的剑桥模型能够较好地表征泥膜压缩固结特性;对于高压泥浆,泥浆重度对泥膜增长的影响较小,但对超大直径的盾构其影响不可忽略。
It is necessary to solve the problem of how to form a safe and effective mud film support on the excavation surface in time. The relationship between solid content and effective stress of clay was established by using the regular curve of normal constant pressure clay consolidation curve in the modified Cambridge model. Combined with the permeability of ideal spherical particle model and solid content of mud, Permeability and specific resistance of the relationship between the three established a new mud film formation constitutive model. The one-dimensional model of mud film formation is extended to a two-dimensional model, and the growth law of mud film is analyzed based on incremental analysis method. The relationship between the loss and thickness of mud film and the location, time, severe ratio and shield diameter are given . The results show that the modified Cambridge model can well characterize the compressive and consolidation properties of the mud film. For the high pressure mud, the mud weight has little effect on the growth of the mud film, but its influence on the oversized diameter shield can not be neglected.