KANG Wenxian, YU Huaichang, WANG Lingling, HUANG Zhiquan. 2016: EXPERIMENTAL STUDY OF INFLUENCE OF WATER ON CREEP PROPERTIES OF SILTY MUDSTONE UNDER TRIAXIAL COMPRESSION. JOURNAL OF ENGINEERING GEOLOGY, 24(4): 622-628. DOI: 10.13544/j.cnki.jeg.2016.04.018
    Citation: KANG Wenxian, YU Huaichang, WANG Lingling, HUANG Zhiquan. 2016: EXPERIMENTAL STUDY OF INFLUENCE OF WATER ON CREEP PROPERTIES OF SILTY MUDSTONE UNDER TRIAXIAL COMPRESSION. JOURNAL OF ENGINEERING GEOLOGY, 24(4): 622-628. DOI: 10.13544/j.cnki.jeg.2016.04.018

    EXPERIMENTAL STUDY OF INFLUENCE OF WATER ON CREEP PROPERTIES OF SILTY MUDSTONE UNDER TRIAXIAL COMPRESSION

    • The creep tests of dry and saturated silty mudstone are conducted using rock rheology testing equipment under triaxial compression. Based on the test results, the effects of water on the creep strain, the long-term strength are investigated. Burgers model is selected to describe the creep properties of dry and saturated silty mudstone. Then using the Levenberg-Marquardt algorithm, the Burgers creep model parameters of dry and saturated silty mudstone are obtained. According to the identification results, the effects of water on Burgers creep model parameters are studied. The results show that:(1) Water has little effect on the instantaneous strains of silty mudstone and a great effect on the creep strains of the rock under the same stress level. (2) The long-term strength of saturated silty mudstone is only 39.3 percent of that of the dry rock, so the long-term strength of the rock decrease remarkably owing to the influence of water. (3) The effect of water on the η1 of the Burgers creep model is the highest, followed by the G1, and that on the G2 and η2 is the lowest, which shows water has a greater effect on the series elements than on the parallel elements of Burgers model. (4) The time that the rock needs to reach the steady creep stages significantly increases, and the steady-state creep rate of the rock also increases remarkably owing to the influence of water. (5) Water has very significant effect on the creep properties of silty mudstone, and water greatly enhances the time characteristics of silty mudstone, which change the creep properties of silty mudstone. Therefore, the effect of water on the creep properties of silty mudstone can not be ignored in the engineering design and construction of major project.
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