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Abstract The in-situ rheological test under three-dimensional stress is a very useful way to reflect the actual rheological properties of filed rock mass. The test process，method and results of in-situ large-scale true triaxial test are presented. Variation law of deformation with time is further analyzed；and the experimental curve is described using a nonlinear kinetic creep model. Then，the theoretical rheological equation is established；each parameter of creep model is obtained and the rheological characteristics of deep soft rock are well reflected. The results show that the creep rate of mudstone is not only related to stress state，but also to time. The results can be applied to the estimation of long-term deformation of engineering tunnel in soft rock engineering and design of support，which have important reference values to the optimization design of tunnel support of soft rock.
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Received: 30 December 2008
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