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注浆抬升技术是盾构隧道不均匀沉降治理的有效措施之一,但目前尚存在隧道抬升过程上覆土压力计算困难而无法估算抬升引起的隧道受力变形的问题。利用透明土结合PIV观测技术设计研发了模拟盾构隧道抬升的小比尺室内模型试验系统,通过试验获得了隧道抬升过程极限上覆土压力及上覆土速度场,根据上覆土的剪切滑移特征将上覆土分成了4个不同的运动区域,进而结合相关联流动法则,提出了隧道抬升作用下极限上覆土压力计算模型,并基于虚功平衡方程,推导了极限上覆土压力计算表达式。将计算所得的极限上覆土压力值与试验结果进行对比,两者有较好的吻合度,计算误差在4%~15%之间。
The grouting and lifting technology is one of the effective measures to control the uneven settlement of shield tunnels. However, there is still a problem that the calculation of the earth pressure on the tunnel during the lifting process can not be estimated and the stress and deformation of the tunnel caused by the lifting can not be estimated. Based on the PIV observation technique, a small-scale indoor model test system for simulating shield tunneling was designed and developed. The ultimate overburden pressure and overlying soil velocity field were obtained through experiments. According to the shear slip characteristics of overburden soil The overburden soil is divided into four different movement regions, and then combined with the associated flow law, the calculation model of the ultimate overburden pressure under the tunnel lifting action is proposed. Based on the virtual work balance equation, the expression of the overburden earth pressure is deduced. Comparing the calculated limit overburden pressure with the test results, the two have a good agreement, the calculation error is between 4% and 15%.