云桂铁路高填方段路基下伏断层错动数值模拟研究

云桂铁路高填方段路堤DK707+800~+990存在两条次生活动断层，在地震作用下，下伏断层错动往往将会直接损害断层上修建的路基，可能造成断道等灾害。由于工程的复杂性，利用数值模拟对其进行原型建模。首先对其进行静力分析，包括瞬时重力加载与分步施工模拟，模拟发现经过灌注桩群加固后，该结构在自重下是稳定的，然后对其进行了动力分析模拟断层水平错动对该路基结构的影响；最后通过Abaqus面面接触模型，建立夹砂褥垫层模型，以此来模拟该路基在减隔震措施下的动力响应特性，并与未设褥垫层时进行了对比。

Numerical Simulation Study of Underlying Fault Dislocation in High Fill Embankment

There are two secondary active faults in the high fill subgrade DK707+800~+990 of Yunnan—Cuangxi Railway. The dislocation of the underlying fault will often directly damage the subgrade built across the fault under seismic conditions, resulting in road breaks and other disasters. Due to the complexity of engineering, the numerical simulation was used to model the prototype. Firstly, the static analysis of the subgrade are carried out, including the instantaneous gravity loading and step by step construction simulation. The structure is stable under self-weight after the reinforcement of cast-in-place pile group. And then, the simulation of the influence of horizontal dislocation of the fault on the subgrade structure is run with dynamic analysis. Finally, the surface contact model of Abaqus was used to establish the sand cushion model, so as to analyze the dynamic response characteristics of the embankment under the seismic reducing and isolation measures, and compared with the overall analysis.