盾构始发与接收时顶力的数值模拟研究——以北京地铁15号线某盾构直接切削玻璃纤维筋桩工程为例  

Study on Numerical Simulation of Thrusting Force of Shield Launching and Receiving: A Case Study on Glassfiber Reinforced Plastic( GFRP) Pile Cut Directly by Shield Machine Used in Line No.15 of Beijing Metro

作　　者：刘军[1] 荀桂富 王芳[2] 金鑫[1] 

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]清华大学水利工程系,北京100084

出　　处：《隧道建设》2016年第3期264-269,共6页Tunnel Construction

基　　金：北京市自然科学基金项目;北京市教育委员会科技计划重点项目(KZ20131001601);北京市属高等学校创新团队建设与教师职业发展计划项目(IDHT20130512)

摘　　要：盾构顶力是盾构始发和接收过程中的主要控制参数。以北京地铁15号线某6 m盾构直接切削玻璃纤维筋桩工程为背景,采用有限差分软件FLAC3D研究分析了盾构始发与接收时不同刀盘正面顶力作用下围护桩体受力以及地表变形规律。研究结果表明:盾构始发中在切割玻璃纤维筋桩体时,若顶力大于10 000 k N,会引起地表隆起;盾构接收中在切割玻璃纤维筋桩体围护结构时,由于桩的一侧为临空面,当盾构顶力大于8 000 k N时,会引起桩体发生向临空侧的倒塌破坏,存在一定的安全隐患。该研究对洞口处玻璃纤维筋桩体的设计和盾构安全施工具有较大的指导意义。The Thrusting force is the main control parameter in the shield launching and receiving. In this paper,the rules of retaining pile stressing and ground surface settlement under different thrusting forces on the cutterhead during shield launching and receiving are studied by means of finite difference FLAC3 D software,with the glassfiber reinforced plastic（ GFRP） pile cut directly by a φ6 m shield machine used in Line No. 15 of Beijing Metro as an example. The study results show that： 1） Settlement would occur to the ground surface when the thrusting force of shield launching is larger than 10 000 k N. 2） The GFRP pile would fall towards the free side when the thrusting force of shield receiving is larger than 8 000 k N. The results can provide guidance for the design of GFPR pile and the safe construction of shield tunneling.

关 键 词：北京地铁 盾构始发 盾构接收 顶力 玻璃纤维筋桩 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]