Considering the rheological mechanical characteristics of rock mass, a viscous-plastic model of rock mass which can describe the acceleration creep stage of rock mass was proposed. Moreover, combining with viscous-elastic shearing rheological model of rock mass in series, a new constitutive model of visco-elasticity-plasticity considering the rheology was constructed. Due to the shearing rheological curves of granite, the model of visco-elasticity-plasticity considering the rheology was identified and the rheological parameters of the model were obtained. The comparison between the viscous-elastic-plastic rheological model of rock mass and experimental result of granite shows that the accelerating rheological properties of rock mass can be depicted effectively by the constitutive model of visco-elasticity-plasticity considering the rheology.
Wuchang railway station expansion project was of a urgent construction period, requiring the high level of environmental protection and good quality. And to so large number of foundation engineering, the application of rotary drilling pile construction method could save time, reduce environmental pollution, and was suitable for silt, clay, sand and gravel strata. Through the engineering examples, the construction produces including scheme and technologies are introduced, and production and installation of steel casing, slurry pools and production, borehole-creating, production and hoisting of cages, concrete grouting and inspection key points are discussed in detail. The practice shows that rotary drilling pile construction method has a good overall efficiency in the expansion project of railway station.
According to geological investigation and monitoring results, this paper analyzed the reasons for large deformation in Baozhen Tunnel, discussed the deformation characteristics and presented the corresponding supporting measures.
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