Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang' an University, Xi'an, China.
PLoS One. 2021 Mar 3;16(3):e0247599. doi: 10.1371/journal.pone.0247599. eCollection 2021.
The vertical vibration compaction method (VVCM), heavy compaction method and static pressure method were used to form phyllite specimens with different degrees of weathering. The influence of cement content, compactness, and compaction method on the mechanical properties of phyllite was studied. The mechanical properties of phyllite was evaluated in terms of unconfined compressive strength (Rc) and modulus of resilience (Ec). Further, test roads were paved along an expressway in China to demonstrate the feasibility of the highly weathered phyllite improvement technology. Results show that unweathered phyllite can be used as subgrade filler. In spite of increasing compactness, phyllite with a higher degree of weathering cannot meet the requirements for subgrade filler. With increasing cement content, Rc and Ec of the improved phyllite increases linearly. Rc and Ec increase by at least 15% and 17%, respectively, for every 1% increase in cement content and by at least 10% and 6%, respectively, for every 1% increase in compactness. The higher the degree of weathering of phyllite, the greater the degree of improvement of its mechanical properties.
采用垂直振动压实法（VVCM）、强夯法和静压法对不同风化程度的千枚岩试样进行成型。研究了水泥含量、压实度和压实方法对千枚岩力学性能的影响。用无侧限抗压强度（Rc）和回弹模量（Ec）来评价千枚岩的力学性能。此外，在中国的一条高速公路沿线修筑了试验路，以验证高度风化千枚岩改良技术的可行性。结果表明，未风化千枚岩可用作路基填料。尽管压实度增加，但风化程度较高的千枚岩仍不能满足路基填料的要求。随着水泥含量的增加，改良千枚岩的 Rc 和 Ec 呈线性增加。水泥含量每增加 1%，Rc 和 Ec 分别至少增加 15%和 17%；压实度每增加 1%，Rc 和 Ec 分别至少增加 10%和 6%。千枚岩的风化程度越高，其力学性能的改善程度越大。
