中南大学学报（自然科学版）2025，Vol.56Issue(2)：610-621,12.DOI:10.11817/j.issn.1672-7207.2025.02.017
预应力盾构隧道的等效刚度梁模型及纵向变形控制研究
Research on equivalent stiffness beam model and longitudinal deformation control of prestressed shield tunnel
摘要
Abstract
Changes in geological conditions,additional loads and constraints often cause uneven longitudinal deformation in shield tunnels,leading to joint leakage.Applying longitudinal prestress effectively addresses this issue.To investigate the longitudinal mechanical properties of prestressed shield tunnels,the longitudinal equivalent stiffness beam models for tunnels were established in two contact states of the circumferential seam of fully closed and partially open.Based on seven proposed longitudinal deformation control indices,and by optimizing the best longitudinal prestress through a case study of a cross-river tunnel project in Shanghai,the influence of optimal prestress on excessive longitudinal bending moments was analyzed.The results show that under an optimal prestress of 9.24 MN,both the longitudinal bending stiffness and curvature radius significantly increase,reducing the circumferential seam deformation by 99.67％and substantially improving the tightness of circumferential seam.During the longitudinal bending process of the optimal prestressed shield tunnel,the longitudinal curvature radius first reaches the limit value of 15 000 m,followed by some bolts entering the yield state,and the opening of the circumferential seam successively reaching 2 mm and 6 mm.Concrete stress reaches the compressive strength,and eventually,some bolts fail due to the tensile deformation.Compared to non-prestressed shield tunnels,the optimal prestressed tunnel shows a 2.46 to 9.33 times increase in excessive longitudinal bending moment and bending stiffness,significantly enhancing the longitudinal load-bearing capacity,though the longitudinal curvature radius decreases by 2.13％to 6.70％.Applying longitudinal prestress is recommended to reduce uneven longitudinal deformation in shield tunnels,with special attention to changes in the tunnel's longitudinal curvature radius and bolt stress during the application process.关键词
等效刚度梁模型/盾构隧道/最佳预应力/纵向变形控制/超限纵向弯矩Key words
equivalent stiffness beam model/shield tunnel/optimal prestress/longitudinal deformation control/excessive longitudinal bending moment分类
土木建筑引用本文复制引用
王亚,廖少明,马思浩,刘颖彬..预应力盾构隧道的等效刚度梁模型及纵向变形控制研究[J].中南大学学报（自然科学版）,2025,56(2):610-621,12.基金项目
国家自然科学基金资助项目(52090082)(Project(52090082)supported by the National Natural Science Foundation of China) （52090082）
