Abstract
In tunneling with the TBM, the loading test with the main grippers are often conducted to estimate the deformability of the rock mass. In this study, loading tests withgrippers ofa hooded tunnel excavation machine were performed. The elastic moduli of the rock mass were estimated from the loading-displacement curves based on the finite element analysis. The Young's moduli of the rock mass obtained from the gripper loading tests were discussed by comparison with the laboratory test results and the elastic modulus evaluated from the rock displacements mesured with an extensometer. The gripper loading test is useful in that the elastic properties of the rock mass can be approximately estimated without disturbing the tunnel excavation processes.
