黄土地层盾构隧道衬背空洞注浆过程变形规律

发布时间：2018-05-14 22:08

本文选题：黄土地层 + 盾构隧道　；参考：《解放军理工大学学报(自然科学版)》2015年03期

【摘要】：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31mm,累计隆起值为5mm;管片累计横向位移值为45mm,上浮量达55mm,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41mm,累计隆起值为62mm;管片累计竖向位移值为65mm,累计收敛峰值为47mm。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。
[Abstract]:In order to study the deformation law of cavity grouting on the back of loess shield tunnel, a three dimensional nonlinear finite element method coupled with seepage and stress was used. This paper systematically analyzes the deformation law of tunnel structure system in the process of treating the cavity grouting disease in the back of a certain section of Xi'an subway tunnel, and contrasts with the measured displacement results and verifies each other. The measured results show that in the process of grouting, the accumulative settlement value is 31 mm, the accumulated uplift value is 5 mm, the cumulative transverse displacement value is 45 mm, and the floating amount is 55 mm, which leads to the damage and displacement of the segment. The coupled numerical analysis shows that the accumulated subsidence value is 41 mm, the accumulated uplift value is 62 mm, the cumulative vertical displacement value is 65 mm, and the accumulative convergence peak value is 47 mm. The calculated results of vertical displacement and convergence of the segments based on the seepage stress coupling method are in good agreement with the measured results. Because the complex factors of sediment erosion voids are not taken into account in the seepage process, the vertical displacement and convergence of the segments are not considered. There is a big difference between the ground subsidence value and the measured value, but the variation trend is basically the same.
【作者单位】：长安大学陕西省公路桥梁与隧道重点实验室;郑州新郑综合保税区(郑州航空港区)兴港投资发展有限公司;中国中铁电气化局集团有限公司城铁公司;
【基金】：国家自然科学基金资助项目(51178052,50808020) 陕西省科技统筹创新工程计划资助项目(2015KTZDGY01-05-02)
【分类号】：U455.43;U451

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