岩土工程学报2026，Vol.48Issue(5)：1049-1059,11.DOI:10.11779/CJGE20250108
不同层间倾角下砂-黏复合地层隧道开挖面稳定性离心模型试验
Centrifuge tests on stability of tunnel face in sand-clay layered strata with different interlayer angles
摘要
Abstract
Based on centrifuge model tests,this study systematically investigates the stability of a shield tunnel face in sand-clay composite strata for different interlayer inclination angles and interface positions.The experiments employ a high-speed camera and analysis systems to quantitatively analyze soil movement characteristics around the tunnel face,utilize both rear-mounted stress sensors and front-mounted earth pressure cells to measure support pressures,and capture the dynamic evolution of earth pressure fields during instability processes by real-time earth pressure monitoring systems.A three-dimensional discrete element model is established to validate the experimental results.The research findings indicate that interlayer inclination angles significantly influence the instability and failure modes of the tunnel face.Under positive inclination conditions,sand and clay exhibit relatively independent deformation characteristics.Under negative inclination conditions,the two soil layers deform cooperatively,with instability ranges significantly expanding and continuous shear zones penetrating through the stratum interface.When the interlayer interface is located at the crown,positive inclination conditions result in limited instability zones,while negative inclination conditions still produce significant instability.The critical support pressure is primarily influenced by the interlayer interface position,with the required critical support pressure being smaller when the interface is at the crown compared to when it is at the tunnel axis,while the interlayer inclination angle has relatively limited impact on critical support pressure.Earth pressure in the instability zone exhibits a two-stage evolution pattern characterized by rapid initial decline followed by stabilization.The vertical soil arching ratio distribution in the sand layer aligns with the instability zone contour,forming significant lateral soil arching effects with the arch crown and arch waist located near the ground surface and at the interlayer interface.These research findings can deepen our understanding of tunnel face instability mechanisms in inclined composite strata and provide guidance for construction risk control in engineering practice.关键词
盾构隧道/开挖面稳定性/砂-黏复合地层/层间倾角/离心模型试验Key words
shield tunnel/face stability/sand-clay layered strata/interlayer angle/centrifuge test分类
建筑与水利引用本文复制引用
李铉聪,翁效林,叶飞,邓国华,党博涵,张昕晔..不同层间倾角下砂-黏复合地层隧道开挖面稳定性离心模型试验[J].岩土工程学报,2026,48(5):1049-1059,11.基金项目
国家自然科学基金项目(42277151,52178355) （42277151,52178355）
陕西省秦创原"科学家+工程师"队伍建设项目(S2024-YD-QCYK-0027) （S2024-YD-QCYK-0027）
长安大学中央高校基本科研业务费专项资金项目(300102214201)This work was supported by the National Natural Science Foundation of China(Grant Nos.42277151,52178355) （300102214201）
the Qinchuangyuan"Scientist+Engineer"Team Building Project of Shaanxi Province(Grant No.S2024-YD-QCYK-0027) （Grant No.S2024-YD-QCYK-0027）
and the Fundamental Research Funds for the Central Universities,CHD(Grant No.300102214201). （Grant No.300102214201）
