小净距隧道洞口浅埋段地表变形特征分析

Analysis on Small Spacing Tunnel Ground Subsidence of Shallowly-buried Portal Part

选取典型的小净距隧道洞口浅埋段施工时序,分析地表沉降监测数据并采用FLAC3D施工全过程进行数值模拟,研究隧道左右线洞口段施工时序对隧道地表沉降的影响,现场监控量测数据与数值模拟互为验证,总结典型隧道施工时序中地表沉降的变化特点,为避免施工中出现多个风险部位对施工工序的优化提出建议。

This paper chose the typical construction sequence for the shallow-buried section of the tunnel with small interval,analyzed the data of surface settlement prediction and used FLAC3 D to do numerical simulation during the whole course to study how the construction sequence of the portal section in both sides of the tunnel affect the surface settlement.The data from the on-site inspection and the numerical simulation are verifications for each other.In addition,this paper concluded the change characteristics of surface settlement in the typical construction sequence for tunnels and proposed suggestions to avoid risks during the construction and to optimize the construction sequence.