土压平衡盾构穿越浅基础拉杆拱桥施工沉降控制技术研究  

Settlement control method for shallow foundation tied arch bridge lying over earth-pressure balance shield construction

作　　者：温法庆[1] WEN Faqing(China Railway 18th Bureau Group Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《隧道与地下工程灾害防治》2019年第2期114-123,共10页Hazard Control in Tunnelling and Underground Engineering

基　　金：山东省住房城乡建设科技计划资助项目(2017-R1-025)

摘　　要：在土压平衡盾构穿越浅基础拉杆拱桥施工过程中,桥台基础的沉降需要严格控制。为研究静压注浆法对桥台基础沉降的控制作用,以某市地铁施工为例,建立土压平衡盾构穿越浅基础拉杆拱桥的模型,并在FLAC3D中模拟盾构分步掘进的施工过程。数值模拟结果显示,在施工过程中桥台基础的沉降大于规范要求。采取静压注浆法加固桥台基础,并结合加固后的地层参数,再次建立模型进行数值模拟计算。通过比较两次所得的模拟沉降数据可知,认为静压注浆法可以有效控制桥台基础沉降。在实际施工过程中对拉杆拱桥的桥台、桥面沉降进行监测,监测数据与加固后的模拟沉降数据吻合较好,验证静压注浆法对桥台加固、控制桥台桥面沉降的有效性。The settlement of bridge abutment should be strictly controlled during the tunneling shield construction under the shallowfoundation of tied arch bridges.To investigate the effect of static pressure injection method on the settlement control of bridge abutment,the tunneling shield models in a subway construction under shallowfoundation of tied arch bridges was set up and the sequential excavation of the tunneling shields was simulated by FLAC3 D.The numerical simulation results indicated that the settlement of bridge abutment would exceed the regulation requirement.Reinforced by the static pressure injection method,the bridge abutment was numerically simulated once again by adjusting relative parameters.The latter simulating results indicated the settlement of bridge abutment was well controlled.By monitoring the settlements of bridge abutment and deck in the construction,the numerical results were validated and the static pressure injection method was proved to be effective on settlement controlling of bridge abutment.

关 键 词：盾构 拉杆拱桥 静压注浆 数值模拟 沉降控制 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]