Abstract
Full-face hard rock tunnel boring machines (TBM) are essential equipment in highway and railway tunnel engineering construction. During the tunneling process, TBM have serious vibrations, which can damage some of its key components. The support system,an important part of TBM, is one path through which vibrational energy from the cutter head is transmitted. To reduce the vibration of support systems of TBM during the excavation process, based on the structural features of the support hydraulic system, a nonlinear dynamical model of support hydraulic systems of TBM is established. The influences of the component structure parameters and operating conditions parameters on the stiffness characteristics of the support hydraulic system are analyzed. The analysis results indicate that the static stiffness of the support hydraulic system consists of an increase stage, stable stage and decrease stage. The static stiffness value increases with an increase in the clearances. The pre-compression length of the spring in the relief valve affects the range of the stable stage of the static stiffness, and it does not affect the static stiffness value. The dynamic stiffness of the support hydraulic system consists of a U-shape and reverse U-shape. The bottom value of the U-shape increases with the amplitude and frequency of the external force acting on the cylinder body, however, the top value of the reverse U-shape remains constant. This study instructs how to design the support hydraulic system of TBM.
Highlights
Full-face hard rock tunnel boring machines (TBM) are widely used in highway and railway tunnel engineering construction because excavating tunnels with TBM has advantages such as little environmental disturbance, high tunnel efficiency, low personnel expenditure, and better working conditions and safety [1, 2]
(a) The static stiffness of the support hydraulic system consists of three stages; the increase stage, stable stage, and decrease stage
(c) The pre-compression length of the spring in the relief valve has no influence on the static stiffness value of the support hydraulic system; the pre-compression length does influence the range of the stable stage of the static stiffness
Summary
Full-face hard rock tunnel boring machines (TBM) are widely used in highway and railway tunnel engineering construction because excavating tunnels with TBM has advantages such as little environmental disturbance, high tunnel efficiency, low personnel expenditure, and better working conditions and safety [1, 2]. The dynamic characteristics of the relief valve in the support hydraulic system and the leakage characteristics of the gripper cylinder had not been taken into account in the system model, and linearization may lack some important characteristics. Lei et al [20] analyzed the gripper cylinder internal leakage characteristics of TBM and the influences of the cylinder structure parameters and working conditions parameters on the structure feature of the support hydraulic system. Where βe is the bulk modulus of the working fluid media, V is the initial volume of the rod chamber, ql and ql are the leakage flowrates from the rod-less chambers to the rod chambers of the two cylinders, respectively, and qv , qv2 denote the flowrates of the relief valves.
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