动态扰动对不同含水率砂岩应力松弛影响的研究

发布时间：2018-03-18 04:03

本文选题：砂岩变形　切入点：应力松弛　出处：《东北大学学报(自然科学版)》2017年09期 　论文类型：期刊论文

【摘要】：采用课题组自制的岩石松弛-扰动试验装置,研究了不同含水率砂岩的松弛过程动态扰动的影响,测试轴向应力、轴向应变的变化,观察到了砂岩试样在动态扰动后应变增加、应力降低的现象.根据试验数据,分析了松弛稳定后水对砂岩试样应力松弛量和应力松弛度的影响,基于岩石松弛扰动效应的本构方程,得到不同含水率扰动系数在2~6之间.结果表明:(1)由于水的影响作用,松弛稳定后砂岩试样的应力松弛量增加、应力松弛度增大,水对砂岩试样应力松弛衰减的影响作用增强;(2)在相同的冲击扰动能量作用下,含水率高的砂岩试样在动态扰动后应变增加和应力降低的现象更明显,扰动系数随含水率增加而增大.
[Abstract]:In this paper, the effect of dynamic disturbance on relaxation process of sandstone with different moisture content is studied by using the rock relaxation and disturbance test device made by our research group. The variation of axial stress and axial strain is measured. The strain of sandstone specimen increases after dynamic disturbance. Based on the experimental data, the influence of water on the stress relaxation and stress relaxation of sandstone specimen is analyzed, based on the constitutive equation of rock relaxation disturbance effect. The results show that the disturbance coefficient of different water cut is between 2 and 6. The results show that the stress relaxation of sandstone specimen increases and the stress relaxation degree increases after relaxation and stabilization due to the effect of water. The effect of water on stress relaxation attenuation of sandstone specimen is enhanced. (2) under the same impact disturbance energy, the strain increase and stress decrease of sandstone sample with high water content are more obvious after dynamic disturbance. The disturbance coefficient increases with the increase of moisture content.
【作者单位】：东北大学资源与土木工程学院;
【基金】：国家自然科学基金资助项目(51404067) 中央高校基本科研业务费专项资金资助项目(N140105001,N140106002)
【分类号】：TU45

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