BACKGROUND Recent studies have emphasized the importance of anatomic tunnel placement during anterior cruciate ligament (ACL) reconstruction in an effort to restore normal knee kinematics and stability. Secondary to the constraints imposed by a coupled drilling technique, the ability to achieve an anatomic femoral tunnel during transtibial hamstring ACL reconstruction may be limited. HYPOTHES...

In this paper, numerical simulations of face stability shallow tunnels are carried out by using the particle discrete element codes PFC2D from microscopic view. Progressive instability tunnel is achieved through withdrawal baffle used to simulate face. Under different retreating displacement face, evolution laws support pressure on ground deformation, surface settlement and contact force chain ...

An increasing number of railway tunnels are afflicted with tunnel lining diseases. Through on-site detection diseases in double-track tunnels, this paper analyzed its causative factors and developed a section steel arch frame reinforcement. simulation mechanical performance, both the plate concrete met tensile strength code requirements for design (TB 10003-2016). It effectively repaired damage...

The boundary element technique is a practical problem-solving tool and useful in comparison to other currently popular alternatives. In this paper, a circular tunnel of a diameter 3.4 m is to be excavated through a clayey soil and surrounded by concrete lining of a thickness 0.2 m, so the clear internal diameter is 3.0 m. A plane strain analysis is adopted for such problem and the soil is assum...

The secondary lining failure of deep buried soft rock tunnel often occurs, which is obviously related to the time factor. formation mechanism this phenomenon studied in paper. Therefore, combination situ stress measurement and neural network inversion used analyze distribution characteristics stress. At same time, creep surrounding are tested laboratory, key parameters obtained. Combined with r...

The joints between segmental rings can withstand a certain amount of bending moment as well as axial and shear forces. Generally, in the structural analysis of tunnel segmental lining, the joints can be modeled as elastic hinges or rotational springs, and their rigidity should be demonstrated in terms of the rigidity of the joints or their rotational stiffness. Therefore, the bending moment act...