活动断裂对铁路路基变形影响研究

铁路的功能和技术特点决定了其选线过程避让活动断裂的困难性。以选择典型的双线铁路路基为研究对象，考虑活动断裂与路基线位的关系为正交和斜交两种，断层倾角为30°，60°两种，断层分为正断层和逆断层，对不同断层影响下的路基变形特征及土工格栅受力特点进行数值模拟分析，结果表明:断层与路基线位交角越小、断层倾角越小，导致的路基变形范围就越大；正断层影响下，土工格栅可发挥抗拉伸作用，在一定程度上减少路基沉降，且断层倾角越小，土工格栅作用效果就越好；逆断层影响下，土工格栅主要受到挤压应力，作用效果较差。

Study on the Influence of Active Fracture on the Deformation of Railway Subgrade

The function and technical characteristics of the railway determine the difficulty of avoiding the active fault in the process of line selection. The typical double-track railway subgrade is selected as the research object, and the relationship between active faults and subgrade line position is considered to be orthogonal and oblique. The dip angle of faults is 30° and 60°, and the faults are divided into normal faults and thrust faults. Numerical analysis software is used to calculate and analyze the deformation characteristics of subgrade and the force characteristics of geogrid under the influence of different faults. The results show that: the smaller the intersection angle between fault and subgrade line position, the smaller the dip angle of fault, the larger the deformation range of subgrade will be. Under the influence of normal faults, the geogrid can play the role of tensile resistance and reduce the subgrade settlement to a certain extent, and the smaller the fault dip angle is, the better the effect of geogrid will be. Under the influence of thrust fault, the geogrid is mainly subjected to extrusion stress and has poor effect.