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Abstract Shear rheological experiments on the saturated sandstone of Wuhan Yangtze River tunnel with JQ200 shear rheometer are conducted. Long-term rheological curves in different stress states of saturated sandstone are obtained. Analyzing its rheological properties and comparing with those of dry sandstone，the results show that saturated sandstone¢s rheological properties are much more distinct than that of dry sandstone and its stress threshold is lower. Based on the shear rheological curves，the five-component viscoelastic rheological model is adopted after distinguishing from many rheological models. Then the model is used to simulate the experimental results. In order to simulate the whole shear rheological curves，the I-NVPB model is proposed. Based on the two shear rheological models mentioned above，all the shear rheological parameters are obtained. The comparison between the shear rheological model and experimental results shows that the I-NVPB model is reasonable and it has important engineering significance and popularization value.
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Received: 20 May 2009
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