既有邻近隧道的深基坑开挖安全评估

Safety Assessment for Deep Foundation Pit Excavation of Adjacent Tunnels

针对基坑周边既有隧道,为了研究深基坑施工阶段的开挖对附近隧道及基坑本身的影响,采用midas GTS NX软件对三维深基坑施工阶段进行分析。分析结果表明:基坑支护结构桩顶最大水平位移、桩顶最大竖向位移、围护桩深层最大水平位移等均满足规范要求;隧道结构最大沉降为0.8mm,隧道结构最大沉降差为0.6mm,均满足规范要求。

For both around the tunnel,midas GTS NX software was used to analyze the 3D deep foundation pit in order to study the phase of the construction of foundation pit excavation of tunnels and foundation pit near itself and the effect.The results of study showed that the foundation pit supporting structure of the maximum horizontal displacement of pile head,the maximum vertical displacement of pile top,the deep maximum horizontal displacement of retaining piles can satisfy the requirements of specification and the maximum settlement of tunnel structure was 0.8mm,and the maximum settlement difference of tunnel structure was 0.6mm,which all met the requirements of specification.