中文摘要：

三趾马红土中石楼隧道4km洞身位于地下水位线以下,围岩极易产生过大变形甚至失稳破坏.通过原位大剪试验,探讨围岩剪应力与剪切位移的变化规律,并得出C、φ值.在此基础上,建立石楼隧道有限元数值模型,分析施工过程中拱顶沉降、水平收敛、应力场、锚杆轴力及初期支护结构弯矩的变化规律,并与现场监测结果进行对比.结果表明：①剪应力与剪切位移呈弱硬化状态;②拱顶沉降、水平收敛在毛洞阶段变形较大,初期支护体系能有效控制围岩变形,拱角极易产生应力集中.建议及早施作仰拱以排除病害,锚杆及支护结构在各自极限范围内,整体是安全的.

英文摘要：

The Shilou tunnel in the Hipparion red clay exists below the groundwater level for 4 kin. As a result, the surrounding rock is easy to produce large deformation and even lead to the instability destruction By using in-situ shear test, we examine and discuss the change in shear stress and shear displacement of the surrounding rock, and acquire the values of C and q~. On this basis, the finite element numerical model of the Hipparion red soil tunnel is established, and change in vault settlement, horizontal convergence, stress field, bolt axial forces and bending moments of suporting structure in the process of construction are analyzed, and the dynamic monitoring results in the construction site are compared. The results show that （ 1 ） shear stress and shear displacement is in a weak hardening state; （2） the deformation of the vault settlement and the convergence during excavation completion is large. As the supporting is gradually completed, the vault settlement and horizontal convergence is controlled effectively. The arch angle force in stress is bigger, and it is easier to produce stress concentration. Thus, the inverted arch can effectively eliminate disease as early as possible. The anchor and supporting structure in the respective limit range are safe as a whole