为了研究黄土地层盾构隧道衬背空洞注浆过程变形规律,采用渗流-应力耦合三维非线性有限元方法,系统分析了西安地铁某区间隧道衬背空洞注浆病害治理过程中隧道结构体系变形规律,并与实测位移成果进行对比分析、相互印证.实测结果表明,注浆过程中,地表累计沉降值为31 mm,累计隆起值为5 mm；管片累计横向位移值为45 mm,上浮量达55 mm,最终导致了管片破损和位移.耦合数值分析表明,地表累计沉降值为41 mm,累计隆起值为62 mm；管片累计竖向位移值为65 mm,累计收敛峰值为47 mm.基于渗流-应力耦合改变地下水位的方法计算得到的管片竖向位移和收敛结果与实测结果吻合良好,由于未考虑渗流过程中水流携带泥沙侵蚀空洞的复杂因素,地表沉降值与实测值相差较大,但变化趋势基本一致.%To investigate the deformation law of loess shied tunnel during the backing void grouting process,the deformation mechanism of tunnel structure system during backing void grouting in a Xi'an metro section was studied based on 3D fluid-solid coupling nonlinear finite element model,and compared with the monitoring results.The monitoring results indicate that the final ground surface settlement is 31 mm,and that the final uplift value is 5 mm,which are monitored during grouting.Meanwhile,the seg-ment horizontal displacement is 45 mm in total,and the segment final floating displacement is 55 mm, which eventually leads to the segment damage and displacement.The fluid-solid coupling numerical results show that the final ground surface settlement is 41 mm,and that the final uplift value is 62 mm.Mean-while,the segment vertical displacement is 65 mm in total,and the segment maximum convergence dis-placement is 47 mm.The numerical simulation results are got by revising the value of water level in the fluid-solid coupling numerical simulation.The comparison of simulation with the monitoring results indi-cates that the segment vertical displacement and convergence results are in good agreement with the moni-toring results.The numerical ground surface settlement value is largely different from the monitoring results re-gardless of the factors that void is eroded by flow in seepage process,but the change tendency is consistent.
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