基于同块同压原则的盾构推拼同步技术模型试验研究

Model Test Verification of Synchronous Technology Combining Shield Tunneling with Segment Assembling Based on Principle of Uniform Loading on a Single Segment

为解决长距离隧道单台盾构掘进施工工期过长问题,以上海市域铁路机场联络线3标盾构区间为示范应用工程,在不改变盾构驾驶人员操作习惯的前提下,研发一种对盾构推进油缸压力进行闭环主动控制的推拼同步施工技术,以维持推进系统稳定的总顶推力矢量。同时,给出基于同块同压原则缺失顶力的再分配计算方法,并通过构建相似比为1/2的大型试验平台对成套技术进行试验验证。试验结果表明:原型盾构推进系统总顶推力误差控制为±4%;盾构姿态水平和垂直偏差控制为±12 mm;盾构推进速度控制为设定速度的(-6,+6)mm/min;管片结构抗压安全系数达2.13。

A case study on the 3rd bid section of the Shanghai airport railway link line is presented to effectively shorten the construction period by deploying only one shield in a long-distance shield tunnel.On the premise of keeping the operation habits of shield drivers unchanged,a synchronous technology combining shield tunneling and segment assembling with closed-loop active control on the cylinder pressures of the shield propulsion system is developed,which can maintain the stability of the total thrust force vector.Then,a redistribution calculation method of the missing jacking force is proposed based on the principle of uniform loading on a single segment.Finally,a large-scale test platform with a similarity ratio of 1/2 is established to verify the whole set of the synchronous technology.The test results show the following:first,the error of the total thrust force is controlled within±4%.Second,the horizontal and vertical deviations of shield posture are controlled within±12 mm.Third,the driving speed of the shield ranges from-6 to+6 mm/min of the set value.Finally,the compressive safety factor of the segment structure reaches 2.13.