隧道下穿既有结构物引起的地表沉降控制标准研究

解决好隧道下穿既有结构物引起的地表沉降问题,对城市地下交通和高速铁路的建设具有重要的意义。在调研国内大量隧道下穿开挖引起的地表沉降控制标准和方法的基础上,根据隧道下穿公路、铁路、隧道和建筑物时引起的地表沉降的不同特点,结合隧道的施工、开挖面积、埋深和工程地质条件等因素,对隧道下穿不同的结构物提出不同的控制沉降措施和建议沉降标准。作者认为,目前的隧道下穿引起的地表最大沉降控制标准是不合理的,沉降控制标准应综合考虑既有结构物的特点、地质条件和施工特点等因素。

CONTROL STANDARDS FOR SETTLEMENT OF GROUND SURFACE WITH EXISTING STRUCTURES DUE TO UNDERGROUND CONSTRUCTION OF CROSSING TUNNELS

Ground settlements due to construction of underground tunnels crossing existing structures are an important issue. It is often encountered in the development of underground traffic and high speed railways lines. This paper investigates the ground settlement standards and methods caused by tunnel excavation. According to the different characteristics of roads,railways,tunnels and buildings,and including different construction characteristics,excavation areas,depths and engineering geological conditions,different existing structures have different control measures and recommended standards.So,the current standards of ground settlements are unreasonable in tunnels crossing,because the characteristics of the existing structure,geological conditions and construction features may not be taken into account in the ground settlement standards.