单轴压缩条件下砂岩冻融循环细观结构损伤演化的实验研究

IF 0.7 4区 地球科学 Q4 GEOGRAPHY, PHYSICAL
Hui Liu , SenLei Han , GengShe Yang , Yuan Zhang , JinJie Yu , ZongXin Feng
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引用次数: 2

摘要

在常年冻土或季节性冻土地区,冻融循环对岩体力学特性产生不利影响,导致山体滑坡、岩石侵蚀等地质灾害。通过核磁共振(NMR)和单轴压缩声发射(AE)实验,分析了冻融循环作用下加载砂岩的细观损伤演化规律。实验结果表明:(1)冻融循环使砂岩内部孔隙增大,孔隙尺寸增大,改变了原有孔隙分布;(2)冻融循环损伤与岩石初始损伤呈正相关,且岩石表面损伤比岩样内部损伤更严重。(3)冻融循环对砂岩力学性能产生负面影响,随着冻融循环次数的增加,砂岩的弹性变形阶段逐渐减小,逐渐从脆性破坏过渡到延性破坏。(4)声发射振铃数和累积能量特征参数可以反映冻融损伤的严重程度和动态演化过程,损伤发展速率在关键时刻呈现突变。经过5个冻融循环后,损伤发展速率突然上升,表现为声发射事件的频率和能量急剧增加。高能声发射事件频繁发生在损伤快速扩张期,可作为损伤传播和恶化的重要参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on mesostructural damage evolution of sandstone subjected to freeze-thaw cycling under uniaxial compression

In perennially frozen or seasonally frozen soil regions, freeze-thaw cycling adversely impacts the mechanical properties of rock mass, resulting in landslides, rock erosion, and other geological disasters. The microscopic damage evolution law of loaded sandstone under the freeze-thaw cycle is analyzed by conducting Nuclear Magnetic Resonance (NMR) and uniaxial compression acoustic emission (AE) experiments. The experimental results have shown that: (1) Freeze-thaw cycling increases sandstone's internal pores, enlarges the pore size, and modifies the original pore distribution. (2) The damage due to freeze-thaw cycling is positively correlated with the initial damage to the rock, and the damage on the rock surface is more severe than inside the rock sample. (3) Freeze-thaw cycling negatively impacts the mechanical properties of sandstone, and the elastic deformation stage of sandstone gradually decreases as the number of freeze-thaw cycles increases and gradually transitions from brittle failure to ductile failure. (4) The characteristic parameters of AE ringing count and accumulated energy can reveal the severity of freeze-thaw damage and the dynamic evolution process, and the damage development rate exhibits abrupt changes at critical moments. After five freeze-thaw cycles, the damage development rate rises suddenly, as manifested by a sharp increase in the frequency and energy of AE events. High-energy AE events frequently occur during the rapid expansion period of damage, which can be adopted as an essential reference for damage propagation and aggravation.

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