| 渗流-应力耦合作用下砂岩声发射及分形损伤特征研究 |
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| 引用本文： | 付小凤.渗流-应力耦合作用下砂岩声发射及分形损伤特征研究[J].水文地质工程地质,2017,0(6):83-83. |
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| 作者姓名： | 付小凤 |
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| 作者单位： | 重庆水利电力职业技术学院，重庆402160 |
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| 基金项目： | 校级科研项目(K201522)作者简介:付小凤（1982-），女，硕士，讲师，一级建造师（建筑工程），主要研究方向为项目管理、工程造价、岩土工程。E-mail:eeptuuy4360347@163.com |
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| 摘 要： | 为探究渗流-应力耦合作用下岩石内部微元体的损伤演化特征，对取自某矿井的砂岩进行了三轴渗透及声发射试验。研究结果表明:砂岩的渗透率变化历经降低、动态平衡、快速增加以及略微回落四个阶段；声发射现象呈阶段性变化特征，随着围压的升高，声发射最大值越滞后；基于柱状分形理论得到的分形特征表明，分形维数逐渐降低，表明砂岩内部损伤经历了一个从无序到有序的变化趋势，分形维数突变点的出现，可作为砂岩即将失稳破坏的前兆；渗流-应力耦合作用下砂岩的损伤值呈指数型函数增加，渗透损伤Ds主要集中于屈服阶段之后，渗透损伤与总损伤的比值随围压的升高呈线性减小；应力加载是损伤产生的主要因素，渗透作用为次要因素；分形维数df与损伤D、渗透损伤Ds之间呈良好的负指数型函数关系。
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| 关 键 词： | 渗流-应力耦合作用 砂岩 声发射 分形 损伤 |
| 收稿时间： | 2016-11-14 |
| 修稿时间： | 2017-03-10 |
A study of the acoustic emission and fractal damage of sandstone under the coupling of seepage and stress |
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| FU Xiaofeng.A study of the acoustic emission and fractal damage of sandstone under the coupling of seepage and stress[J].Hydrogeology and Engineering Geology,2017,0(6):83-83. |
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| Authors: | FU Xiaofeng |
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| Institution: | Chongqing Water Resources and Electric Engineering College, Chongqing402160, China |
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| Abstract: | Mechanical properties of rock under seepage-stress coupling are important in mine engineering. In order to explore the evolution of the internal micro-hydro rock damage force under coupling of mine engineering from a sandstone, three axial penetration and acoustic emission tests are conducted. The results show that the change in permeability of the sandstone includes four stages: decrease, dynamic balance, rapid increase and slight decline. The acoustic emission phenomenon is characterized by a periodic change, and the greater the confining pressure is, the more the acoustic emission is lagged. Fractal characteristics based on the columnar fractal theory show that the fractal dimension decreases gradually. The results also show that the internal damage of the sandstone has experienced a change from disorder to order, and the emergence of the fractal dimension can be used as a precursor to the failure of the sandstone. The damage value of the sandstone under seepage-stress coupling increases exponentially, and the seepage damage Ds mainly concentrates on the yield stage. The ratio of the osmotic damage to the total damage decreases linearly with the increasing confining pressure. Stress loading is the main factor of the sandstone damage and the osmotic damage is a secondary factor. The fractal dimension df has a good negative exponential function with the damage D and the osmotic damage Ds. |
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