砂卵石地层盾构施工振动影响分布规律研究  

Study on the Vibration Distribution Law of Shield Construction in Sand Gravel Layer

作　　者：张波[1] 马雪梅[1] 曹伍富[2] 任雪峰[1] 

机构地区：[1]北京城建勘测设计研究院有限责任公司,北京100101 [2]北京轨道交通建设管理有限公司,北京100037

出　　处：《施工技术》2013年第19期103-106,121,共5页Construction Technology

基　　金：北京市自然科学基金(重点项目)(8111001)

摘　　要：盾构机在砂卵石层掘进过程中，刀盘切割砂卵石而产生较大振动，振动传到地表，不仅扰民，而且产生较大的环境影响。以北京地铁10号线二期工程某盾构区间为试验段，对盾构施工洞内管片和地表的振动进行现场监测，了解盾构施工诱发的振动规律和沿地表的传播规律。结果表明：在砂卵石层中，盾构施工会诱发较大的环境振动；在洞内的影响距离约为1．5—2倍洞径；刀盘附近地表振动加速度级超出规范要求，地表振动沿垂直施工轴线方向呈现负指数衰减规律。振动波在传播过程中，中高频衰减较快，远离刀盘处振动频率主要为30～50Hz。A greater vibration will be generated due to cutting sand and gravel in the process of shield machine tunneling. The vibration which transmits to surface not only disturbs residents but also makes a greater environment impacting. This paper takes a subway shield zone tunnel of Beijing Metro Line 10 for an example, carries out field tests of vibration of shield segment and ground surface. The propagation laws of environmental vibration are summarized by analysis on test data. The result shows that the vibration caused by shield construction is closed related to the particle size. The vibration influenced distance in the cave will be 1.5 - 2 times of the hole diameter. The surface vibration acceleration level near the cutter-head is beyond the regulatory requirements. The exponential attenuation rules of the surface acceleration will be showed. The high-frequency has a faster attenuation in transmission process. The main frequency is about 30 -50Hz far from cutter-head.

关 键 词：隧道工程 盾构 砂卵石地层 振动 衰减规律 监测 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]