水物理化学效应下砂岩内变量蠕变本构模型研究.docVIP

  水物理化学效应下砂岩内变量蠕变本构模 型研究# 乔丽苹1,2，王者超1* 5 10 15 20 25 30 35 40 （1. 山东大学 岩土与结构工程中心，山东济南 250061； 2. 中国科学院武汉岩土力学研究所，湖北武汉 430071） 摘要：通过一系列砂岩单轴压缩蠕变试验，获得了干燥、饱水及经不同水化学溶液循环流动 作用至水-岩反应平衡砂岩试件的蠕变特性。由于循环流动的水化学溶液对砂岩产生了润滑、 软化或泥化等水物理作用以及物质扩散与运移等水化学作用，两者作用使得砂岩内部的组成 及结构发生了变化，从而宏观上影响砂岩蠕变特性。内变量理论是一种采用材料内部结构变 量（即内变量）描述材料性质的理论。基于试验数据，以不可恢复应变作为内变量，提出了 水物理化学效应下砂岩的内变量蠕变本构模型。结果表明，基于不可恢复应变的内变量蠕变 本构模型能够很好的反映复杂水物理化学作用下砂岩的蠕变行为。 关键词：砂岩；水物理化学作用；不可恢复应变；内变量；蠕变本构模型 中图分类号：TU45 AN INTERNAL VARIABLE CREEP CONSTITUTIVE MODEL OF SANDSTONE WITH HYDRO-PHYSICO-CHEMICAL EFFECTS QIAO Liping1,2, WANG Zhechao1 (1. Research center of Geotechnical and Structural Engineering, Shandong University, Jinan Shandong, 250061; 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei, 430071) Abstract: The creep behavior of sandstones were studied by performing a series of uniaxial compression creep tests on dry, saturated sandstones, and the sandstones with hydro-physico-chemical effect subject to the circulating flow of different hydro-chemical solutions. The circulating flow of hydro-chemical solution had both hydro-physical effect and hydro-chemical effects on the sandstones, which changed the internal constituent and structure, therefore, the creep behavior of sandstones were changed. The internal variable theory is based on the internal structure variable, i.e., interbal variable. Based on the creep data, using irreversible strain as internal variable, the internal variable creep constitutive model of sandstone with hydro-physico-chemical effects was proposed. The fitting of test data into the model shows that the internal variable creep model is capable of describing the creep behavior of sandstones under complicated hydro-physico-chemical effects. Key words: sandstone；hydro-physico-chemical effect；irreversible strain；internal variable；creep constitutive model 0 引言 岩石及结构面由于时效变形积累导致的流变破坏对岩体工程的稳定性存在很大的影响。 地下水作为地质灾害中的活跃载体，其对岩体工程稳定性的影响从上世纪 60 年代开始，已 基金项目：国家自然科学基金资助项目(No.； 山东省优秀中青