渗透水压作用下完整砂岩剪切-渗流耦合试验研究
发布时间：2018-10-14 08:10
【摘要】：利用自主研发的煤岩剪切-渗流耦合试验装置,开展了渗透水压作用下完整砂岩试件剪切-渗流耦合特征试验研究。结果表明:(1)在恒定渗透水压情况下,法向应力越大,砂岩的抗剪强度越高,法向变形则越小,砂岩的剪切变形过程可分为3个阶段:剪切变形的线性增长阶段、非稳定破裂发展阶段和剪断后的摩擦滑移阶段;(2)在恒定渗透水压情况下,法向应力越小,法向和剪切变形量越大,剪切断面的起伏程度越大,表面次生裂纹发育越明显、发育范围越宽,砂岩的破坏程度越严重;(3)在整个剪切过程中,剪应力出现几次明显的应力降,首次应力降出现在线弹性变化末期,同时伴有水流流出,说明首次应力降是第一条宏观贯通的裂纹所致,且法向应力越大,裂隙越窄,导水能力越差。
[Abstract]:In this paper, the shear seepage coupling characteristics of intact sandstone specimens under the action of permeable water pressure have been studied by using the coal and rock shear seepage coupling test equipment developed by ourselves. The results show that: (1) under the condition of constant permeable water pressure, the greater the normal stress, the higher the shear strength and the smaller the normal deformation of sandstone. The shear deformation process of sandstone can be divided into three stages: the linear increasing stage of shear deformation. (2) under the condition of constant permeable water pressure, the smaller the normal stress, the greater the normal and shear deformation, the greater the fluctuation of shear section, and the more obvious the development of surface secondary cracks. (3) during the whole shear process, the shear stress appeared several times obvious stress drop, the first stress drop appeared at the end of linear elastic change, and accompanied by the outflow of water. It shows that the first stress drop is caused by the first macroscopic crack, and the greater the normal stress, the narrower the crack and the worse the water conductivity.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室;中煤科工集团重庆研究院有限公司;
【基金】：国家自然科学基金项目(No.51304255,No.51474040) 中国博士后科学基金资助项目(No.2014M552323) 重庆市项目博士后资助(No.Xm2014037)~~
【分类号】：TU45
，
本文编号：2269842
[Abstract]:In this paper, the shear seepage coupling characteristics of intact sandstone specimens under the action of permeable water pressure have been studied by using the coal and rock shear seepage coupling test equipment developed by ourselves. The results show that: (1) under the condition of constant permeable water pressure, the greater the normal stress, the higher the shear strength and the smaller the normal deformation of sandstone. The shear deformation process of sandstone can be divided into three stages: the linear increasing stage of shear deformation. (2) under the condition of constant permeable water pressure, the smaller the normal stress, the greater the normal and shear deformation, the greater the fluctuation of shear section, and the more obvious the development of surface secondary cracks. (3) during the whole shear process, the shear stress appeared several times obvious stress drop, the first stress drop appeared at the end of linear elastic change, and accompanied by the outflow of water. It shows that the first stress drop is caused by the first macroscopic crack, and the greater the normal stress, the narrower the crack and the worse the water conductivity.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学复杂煤气层瓦斯抽采国家地方联合工程实验室;中煤科工集团重庆研究院有限公司;
【基金】：国家自然科学基金项目(No.51304255,No.51474040) 中国博士后科学基金资助项目(No.2014M552323) 重庆市项目博士后资助(No.Xm2014037)~~
【分类号】：TU45
，
本文编号：2269842
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