基于声光联合试验的预制双裂隙砂岩损伤演化特征研究

doi:10.3724/1000-6915.jrme.2024.0288

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摘要为了研究岩桥长度和含水情况对砂岩力学特性及损伤演化规律的影响，开展干燥及饱和2种情况下不同岩桥长度含预制双裂隙砂岩单轴压缩试验，通过声发射(AE)和数字图像相关技术(DIC)实时监测砂岩内部损伤及表面裂纹扩展情况。结果表明：裂隙试件的强度低于完整试件，且岩桥长度越长，试件的单轴抗压强度越大，饱水试件强度低于干燥试件。裂隙试件会在破坏过程中出现应力降，并与AE计数峰值现象对应，岩桥长度增加使第一应力降逐渐向应力峰值靠近，饱水试件的AE计数变化规律与干燥试件一致。饱水试件和干燥试件的AE定位事件和DIC应变异常区域率先集中在岩桥部位，并沿预制裂隙逐渐向试件边界发育。研究结果有助于富水条件下围岩失稳破坏的监测及预警。

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	陈结1
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	孟历德仁1
	崔义1
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	蒲源源1
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	陈紫阳1

关键词 ：岩石力学, 岩桥, 裂纹演化, 声发射, 数字图像相关技术

Abstract：To investigate the influence of rock bridge length and water content on the mechanical properties and damage evolution patterns of sandstone，uniaxial compression tests were conducted on prefabricated double-fracture sandstone samples with varying rock bridge lengths under both dry and saturated conditions. Acoustic emission(AE) and digital image correlation(DIC) techniques were used to monitor the internal damage and surface crack propagation of the sandstone in real-time. The results indicate that the strength of the fractured samples is lower than that of the intact samples，and the longer the rock bridge length，the greater the uniaxial compressive strength of the samples. Saturated samples exhibited lower strength compared to dry samples. Fractured samples will show stress drops during the failure process，which corresponded to peaks in AE counts. As the rock bridge length increased，the first stress drop gradually approached the stress peak. The AE count patterns of the saturated samples were consistent with those of the dry samples. The AE localization events and DIC strain anomaly regions in both saturated and dry samples initially concentrated at the rock bridge area and then gradually developed along the prefabricated fractures towards the sample boundaries. These findings contribute to the monitoring and early warning of rock instability and failure in water-rich conditions.

Key words： rock mechanics rock bridge crack evolution acoustic emission digital image technology

引用本文:

陈结1，2，孟历德仁1，崔义1，3，蒲源源1，2，陈紫阳1. 基于声光联合试验的预制双裂隙砂岩损伤演化特征研究[J]. 岩石力学与工程学报, 2025, 44(1): 30-42.
CHEN Jie1，2，MENLI Deren1，CUI Yi1，3，PU Yuanyuan1，2，CHEN Ziyang1 . Study on the damage evolution characteristics of prefabricated double-fracture sandstone based on acoustic-optical combined tests. , 2025, 44(1): 30-42.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0288 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I1/30

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