粉细砂地层柱洞法下穿市政道路中跨扣拱工序优化研究

摘要

对深孔注浆地层固结体物理力学参数进行直剪试验及三轴试验等室内试验,得到固结体的各物理力学指标,且认为三轴试验所得各指标更为真实、可靠.在此基础上,对粉细砂地层浅埋暗挖车站柱洞法中跨扣拱工序进行了数值模拟,对比分析了地表沉降和结构应力特征,提出了合理施工工序建议.研究结果为石家庄地铁平安大街站提供了技术支持,也可供类似工程参考.%Direct shear test and triaxial test and other laboratory tests are carried out on physical and mechanical parameters of deep hole grouting stratum concretion body.The physical and mechanical indexes of concretion body are obtained,and the index of triaxial test is considered to be more realistic and reliable.Based on this,the numerical simulation of medium-span supporting arch procedure of fine silt sand ground of the shallow-buried excavated station column hole method is carried out.Comparative analysis of surface subsidence and characteristic of structure stress are accomplished,and then reasonable construction procedure suggestions are put forward.Research results provide technical support for the peace street subway station of Shijiazhuang city,and afford reference for the similar projects.