下穿既有快速路的不同隧道开挖工法模拟分析  

Simulation Analysis of Different Tunnel Excavation Methods for Underpass of Existing Expressways

作　　者：要海亮 YAO Hailiang(Shanxi Jiaoke Survey&Design Institute Co.,Ltd.,Taiyuan,Shanxi 030032,China)

机构地区：[1]山西交科公路勘察设计院有限公司,山西太原030032

出　　处：《山西交通科技》2024年第3期84-87,107,共5页Shanxi Science & Technology of Transportation

摘　　要：以某新建隧道下穿既有快速路为项目背景,通过有限元数值模拟手段对比分析了CD法和双侧壁导坑法开挖隧道时对既有公路的影响,分析结果表明CD法和双侧壁导坑法开挖造成的路面最大沉降值依次为1.73 cm和1.43 cm,双侧壁导坑法施工过程中的路面沉降及沉降增量均小于CD法。双侧壁导坑法的塑性区分布范围比CD法更大,但均满足隧道开挖时的稳定性要求。Focusing on a new underpass tunnel of the existing expressway,this paper used the finite element numerical simulation means to compare and analyze the influences of the excavation by the CD method and the twin-side heading method on the existing expressway.The analysis results showed that the maximum settlement values of the road surface caused by the excavation of the CD method and the twin-side heading method were 1.73 cm and 1.43 cm,respectively.Using the twin-side heading method caused a smaller settlement and settlement increment than the CD method during the construction process.The distribution range of the plastic zone of the twin-side heading method was larger than that of the CD method,but they all met the stability requirements of tunnel excavation.

关 键 词：隧道 CD法 双侧壁导坑法 沉降 塑性应变 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]