重载铁路对隧道结构及基底条件影响研究

摘要

Analysis the dynamic stress of heavy haul railway on the new loess by three-dimensional simulation,and the impact of heavy haul railway on the structure of tunnel and basal conditions.Research indicates that the tunnel for heavy haul railway should set inverted arch at the span ratio of 1/10~1/12,and connected orderly with the side wall along the arc,proposed increasing the thickness of the invert filled,besides,foundation stabilization should be taken for the new loess stratum and the foundation bearing capacity after specification should be higher than the value of the existing standard.%通过三维模拟,研究了新黄土地层中重载列车的动应力作用,分析了重载铁路对隧道结构形式及基底地层的影响。建议重载隧道均应设置仰拱,矢跨比1/10～1/12,并与边墙圆弧顺接;适当加大仰拱填充厚度;对新黄土地基作加固处理,处理后地基承载力宜适当高出既有隧道规范规定值。