精品文档---下载后可任意编辑列车振动荷载作用下地层动力响应分析高玄涛（中铁第一勘察设计院集团有限公司，西安 710043）摘要：文章以某隧道下穿高速铁路项目为背景，隧道下穿高速铁路施工为特级风险源，对地层沉降要求极为严格。对隧道下穿施工期间，在列车振动荷载作用下产生的地层动力响应进行了三维数值模拟分析。数值模拟计算结果表明，下穿隧道与高铁路基交叉点处为该工程薄弱环节，在设计与施工过程中需对此处实行加强措施，以保证施工安全及不影响列车正常运行。关键词：下穿隧道振动荷载 数值模拟动力响应Analysis of DynamicProperties of the Soil Induced by theVibration Load ofTrainsWhen the Undercrossing Tunnel Was Excavated to Different LocationsGao Xuan tao(China Railway First Survey and Design Institute Group Ltd.,Xi’an 710043,China)Abstract: The article was based on the engineering of a tunnel beneath a high-speed railway, the construction of the tunnel was a premium source of hazard, so the settlement of the strata was limited strictly. In this paper, the dynamic response of strata under the dynamic train loads during the construction of the tunnel beneath existing railway was computed by means of digital simulation. The simulation results indicate thatthe crossing point of the tunnel and the high-speed railway’s roadbed was the weakness, some measurements should be taken to ensure the safety of the construction and the normal operation of the existing high-speed railways. Key words:undercrossing tunnelvibration loaddigital simulationdynamic response近年来，我国轨道交通得到大力进展。随着我国轨道交通的大规模建设，近接工程数量越来越多，施工难度也越来越大。特别是隧道下穿高速铁路施工时，不可避开地对周围土体产生扰动，引起周围地层损失及路基沉降，造成高速铁路轨道的纵、横向不平顺，从而影响列车的运营安全。本文以某隧道下穿高速铁路项目为讨论背景，主要采纳数值模拟的方法对下穿隧道施工至不同位置时列车动载作用下地层动力响应进行讨论分析，为下穿隧道施工提供理论指导。...
