软土地区新建公路下穿既有高速铁路影响分析及对策  

Analysis of Influence of Newly-built Road Underneath Passing Existing High Speed Railway in Soft Soil Areas and its Countermeasures

作　　者：李悄[1] 孙宗磊[1] 张军[1] 禚一[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《高速铁路技术》2013年第1期26-30,共5页High Speed Railway Technology

摘　　要：在软土地区,高速铁路无砟轨道对沉降有着严格的控制,需对下穿高速铁路桥梁的新建公路采取的结构形式进行深入研究。文章以廊沧高速公路沧州市西绕城连接线下穿京沪高速铁路青沧特大桥为工程背景,采用基于Plaxis有限元程序的数值计算方法分析新建公路采取不同的结构形式对高速铁路的影响,尽量减小填方,并采用轻型筑路材料减轻路基填料重量,经检算对京沪高速铁路桥梁的影响很小,公路施工、运营期间对高速铁路的安全影响均在允许范围内,并且道路施工时结合第三方监测可保证高速铁路的运营安全。Since the ballastless tracks have strict control over subsidence in soft soil areas, it is necessary to study in depth the structure form of these newly-built roads underneath passing the high-speed railway bridges. This paper takes west ring Beijing-S connection road in Cangzhou city of Langcang highway underneath passing the Qingcang Super Major Bridge of hanghai high speed railway as the engineering background, analyzes the influence of newly-built roads with dif- ferent structure forms on high speed railway by adopting the numerical method based on the Plaxis finite element pro- gram, decreasing the fillings to the greatest extent and using light-duty road building material to lighten the subgrade filler weight, thus there is very slight influence on Beijing-Shanghai high speed railway bridges after calculation. The influ- ence on safety of high speed railway during road construction and operation is within allowable scope and the operation safety of high speed railway can be ensured combining with the third party monitoring during road construction.

关 键 词：高速铁路 软土地区 桩基沉降 数值分析 影响评估 Plaxis有限元 

分 类 号：U442.2[建筑科学—桥梁与隧道工程]