康文献, 于怀昌, 王玲玲, 黄志全. 2016: 三轴应力下水对粉砂质泥岩蠕变力学特性影响作用试验研究. 工程地质学报, 24(4): 622-628. DOI: 10.13544/j.cnki.jeg.2016.04.018
    引用本文: 康文献, 于怀昌, 王玲玲, 黄志全. 2016: 三轴应力下水对粉砂质泥岩蠕变力学特性影响作用试验研究. 工程地质学报, 24(4): 622-628. DOI: 10.13544/j.cnki.jeg.2016.04.018
    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

    三轴应力下水对粉砂质泥岩蠕变力学特性影响作用试验研究

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

    • 摘要: 采用岩石流变试验机,在三轴应力下分别对干燥与饱水两种含水状态的粉砂质泥岩开展室内蠕变力学试验。分析了水对粉砂质泥岩蠕变量、蠕变长期强度的影响作用。依据岩石的蠕变性质,选取Burgers蠕变模型对其进行描述,得出两种含水状态下岩石的蠕变模型参数。对比干燥与饱水含水状态下岩石的Burgers蠕变模型参数,分析得出了水影响Burgers蠕变模型参数的基本规律。结果表明:(1)相同应力水平下,水对粉砂质泥岩的瞬时应变特性影响较小,而对岩石的蠕应变特性影响相对较大;(2)饱水试样的蠕变长期强度是干燥试样的39.3%,由于水的作用,粉砂质泥岩的蠕变长期强度大幅降低,在工程中应考虑由于水的影响作用而导致的岩石长期强度降低问题;(3)水对Burgers蠕变模型各参数的影响作用从大到小依次为:η1G1G2η2,即水对Burgers模型中串联的元件力学特性影响较大,而对并联的元件力学特性影响相对较小;(4)由于水的影响作用,粉砂质泥岩达到稳定蠕变阶段所需的时间显著增加,岩石的稳态蠕变速率显著增大;(5)由于水的影响作用,导致粉砂质泥岩的蠕变力学特性发生显著改变。因此,在重大岩石工程中应重视水对岩石时效变形的影响作用。

       

      Abstract: 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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