摘要
依托西北地区某紧邻繁忙铁路干线的明挖隧道项目,对基坑工程中的支护结构设计、基坑桩顶位移、水平位移和地表沉降的现场监测数据进行分析;采用数值模拟软件对基坑开挖过程进行模拟计算,将模拟数据与现场监测数据进行对比,获取准确模拟参数的同时验证模型的准确性;采用数值模拟对第二道钢支撑位置调整并进一步探究不同开挖距离对既有线路基沉降影响。研究结果表明:基坑开挖过程中采用钢结构支护结构形式完全满足实际工程要求,桩顶位移和地表沉降均在安全控制范围内,且远低于预设的安全控制值;通过有限元分析,第二道钢支撑向上调整0.5 m为最佳优化方案,钢结构支护结构优化后,在不同开挖距离下,既有线路基的沉降均保持在安全控制值以内,证明了装配式基坑支护形式的合理性和可靠性。
Based on a open-cut tunnel project close to a busy railway main line in northwest China,the field monitoring data of support structure design,pile top displacement,horizontal displacement and surface settlement in foundation pit engineering were analyzed.Numerical simulation software was used to simulate the excavation process of foundation pit,and the simulation data was compared with the field monitoring data to obtain accurate simulation parameters and verify the accuracy of the model.Numerical simulation was used to adjust the position of the second steel support and further explore the influence of different excavation distances on the settlement of the existing subgrade.The results show that the use of steel structure support structure in the process of foundation pit excavation fully meets the requirements of practical engineering,and the displacement of pile top and ground settlement are within the safety control range,and far below the preset safety control value.Through finite element analysis,the second steel support is adjusted upward by 0.5 m as the best optimization scheme.Under different excavation distances,the settlement of the existing subgrade of the optimized steel structure is kept within the safe control value,which proves the rationality and reliability of the prefabricated foundation pit support form.
作者
杜耀辉
王彦琦
高岳
轩俊杰
Du Yao-hui;Wang Yan-qi;Gao Yue;Xuan Jun-jie(Lanzhou Jiaotong University,730070,Lanzhou,china;Northwest Minzu University,730030,Lanzhou,china)
出处
《建筑技术》
2025年第14期1775-1780,共6页
Architecture Technology
关键词
明挖隧道
繁忙铁路干线
钢结构支护
数值模拟
现场监测
open-cut tunnel
busy trunk railway
steel structure support
numerical simulation
field monitoring
