随着城市轨道交通的发展,土压平衡盾构施工广泛用于地铁隧道施工中,施工地质越复杂,土压平衡盾构施工难度越大。武汉地铁六号线三标盾构施工穿越角砾粘土地层时,土体流动性较差,土压平衡盾构施工难度较大,需利用泡沫剂对土体进行改良。本文以不同混合比的角砾粘土为研究对象,对泡沫改良角砾粘土流动性进行研究,为角砾粘土地层下土压平衡盾构施工泡沫改良土体提供依据。 With the development of urban rail transit, the construction of earth pressure balance shield is widely used in subway tunnel construction. The more complicated the geological construction, the more difficult the earth pressure balance shield construction is. When the third-line shield construction of Wuhan Metro Line 6 passes through the breccia clay stratum, the fluidity of the soil is poor and the earth pressure balance shield construction is more difficult. Therefore, the foam is required to be improved on the soil. In this paper, the different mixed ratio of breccia clay as the research object, the bubble to improve the fluidity of breccia clay to breach clayey clay under the ground shield to provide the basis for the construction of soil pressure balance shield foam.