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| Study on acoustic emission and strain field evolution of red sandstone under different loading and unloading paths |
| WANG Tianzuo1，2，3，WANG Chunli1，2，3，XUE Fei1，2，3，WANG Linxiang1，2，3，XUE Mengya1，2，3 |
(1. School of Civil Engineering，Shaoxing University，Shaoxing，Zhejiang 312000，China；2. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province，Shaoxing University，Shaoxing，Zhejiang 312000，China；3. Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geologic Hazards，Shaoxing University，Shaoxing，
Zhejiang 312000，China) |
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Abstract In order to study the damage evolution law of red sandstone under different cyclic loading and unloading paths，the MTS815 rock mechanics test system was used to perform constant lower limit cyclic loading and unloading test and variable lower limit cyclic loading and unloading test on red sandstone. Meanwhile，acoustic emission(AE) and digital image correlation(DIC) monitoring technique were carried out to capture microfracture and strain evolution information during test. The results showed that compared with the uniaxial compression test，the average compressive strength of the rock under constant lower limit cyclic loading and unloading increased by 6.5%，while the increase under variable lower limit cyclic loading and unloading was not significant. The average ratio of Felicity decreased continuously with the increase of stress under constant lower limit cyclic loading and unloading，while the ratio of Felicity basically remained unchanged in the later period of variable lower limit cyclic loading and unloading. The evolution trend of the apparent strain field was consistent with the variation characteristics of acoustic emission. Under constant lower limit cyclic loading and unloading，the damage deformation of rock increased gradually before failure，showing the characteristics of continuous increase. However，under cyclic loading and unloading of the variable lower limit，the damage strain was relatively dispersed in the early stage of loading and unloading. It was not until the stress exceeds 66% of the peak strength that the large apparent strain points of the rock were dispersed and rapidly concentrated，and the local regional deformation increased sharply，showing the characteristics of abrupt change，and the samples showed severe brittle failure，which should be paid attention to in practical engineering.
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[1] 苏承东，付义胜. 红砂岩三轴压缩变形与强度特征的试验研究[J]. 岩石力学与工程学报，2014，33(增1)：3 164–3 169.(SU Chengdong，FU Yisheng. Experimental study of triaxial compression deformation and strength characteristics of red sandstone[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.1)：3 164–3 169. (in Chinese))
[2] 章清叙，葛修润，黄 铭，等. 周期荷载作用下红砂岩三轴疲劳变形特性试验研究[J]. 岩石力学与工程学报，2006，25(3)：473–478. (ZHANG Qingxu，GE Xiurun，HUANG Ming，et al. Testing study on fatigue deformation law of red-sandstone under triaxial compression with cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(3)：473–478.(in Chinese))
[3] FUENKAJORN K，PHUEAKPHUM D. Effects of cyclic loading on mechanical properties of Maha Sarakham salt[J]. Engineering Geology，2010，112(1)：43–52.
[4] ERARSLAN N，WILLIAMS D J. Investigating the effect of cyclic loading on the indirect tensile strength of rocks[J]. Rock Mechanics and Rock Engineering，2012，45(3)：327–340.
[5] 刘海涛，秦 涛. 砂岩循环加卸载下损伤特性及声发射Kaiser效 应研究[J]. 煤炭科学技术，2019，47(6)：73–80.(LIU Haitao，QIN Tao. Study on damage characteristics and acoustic emission Kaiser effect of sandstone under cyclic loading and unloading conditions[J]. Coal Science and Technology，2019，47(6)：73–80.(in Chinese))
[6] 宋义敏，邢同振，赵同彬，等. 岩石单轴压缩变形场演化的声发射特征研究[J]. 岩石力学与工程学报，2017，36(3)：534–542.(SONG Yimin，XING Tongzhen，ZHAO Tongbin，et al. Acoustic emission characteristics of deformation field development of rock under uniaxial loading[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(3)：534–542.(in Chinese))
[7] MENG Q B，ZHANG M W，HAN L J，et al. Effects of acoustic emission and energy evolution of rock specimens under the uniaxial cyclic loading and unloading compression[J]. Rock Mechanics and Rock Engineering，2016，49(10)：1–14.
[8] VISHAL V，RANJITH P G，SINGH T N. An experimental investigation on behaviour of coal under fluid saturation，using acoustic emission[J]. Journal of Natural Gas Science and Engineering，2015，22：428–436.
[9] NOVIKOV E A，OSHKIN R O，SHKURATNIK V L，et al. Application of thermally stimulated acoustic emission method to assess the thermal resistance and related properties of coals[J]. International Journal of Mining Science and Technology，2018，28(2)：243–249.
[10] 何 俊，潘结南，王安虎. 三轴循环加卸载作用下煤样的声发射特征[J]. 煤炭学报，2014，39(1)：84–90.(HE Jun，PAN Jienan，WANG Anhu. Acoustic emission characteristics of coal specimen under tiaxial cyclic loading and unloading[J]. Journal of China Coal Society，2014，39(1)：84–90.(in Chinese))
[11] 姚吉康，王志亮，何爱林，等. 循环加卸载下花岗岩强度变形及声发射特征[J]. 水利水运工程学报，2018，(2)：77–84.(YAO Jikang，WANG Zhiliang，HE Ailin，et al. Strength and deformation along with acoustic emission characteristics of granite under cyclic loading and unloading[J]. Hydro-Science and Engineering，2018，(2)：77–84.(in Chinese))
[12] LIANG Y P，LI Q M，GU Y L，et al. Mechanical and acoustic emission characteristics of rock：Effect of loading and unloading confining pressure at the postpeak stage[J]. Journal of Natural Gas Science and Engineering，2017，44：54–64.
[13] 张志博，李树杰，王恩元，等. 基于声发射事件时–空维度聚类分析的煤体损伤演化特征研究[J]. 岩石力学与工程学报，2020，39 (增2)：3 338–3 347.(ZHANG Zhibo，LI Shujie，WANG Enyuan，et al. Research on the damage evolution characteristics of coal based on cluster analysis of temporal-spatial dimension of acoustic emission events[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(Supp.2)：3 338–3 347.(in Chinese))
[14] ZHAO C，XING J Q，ZHOU Y M，et al. Experimental investigation on hydraulic fracturing of granite specimens with double flaws based on DIC[J]. Engineering Geology，2020，267：105510.
[15] 王建国，王振伟，马少鹏. 循环载荷作用下岩石材料变形场演化试验研究[J]. 岩石力学与工程学报，2009，28(增2)：3 336–3 341. (WANG Jianguo，WANG Zhenwei，MA Shaopeng. Test study on deformation field evolution of roc material under cyclic load[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.2)：3 336–3 341.(in Chinese))
[16] 赵 程，田加深，松田浩，等. 单轴压缩下基于全局应变场分析的岩石裂纹扩展及其损伤演化特性研究[J]. 岩石力学与工程学报，2015，34(4)：763–769.(ZHAO Chen，TIAN Jiashen，MATSUDA Hiroshi，et al. Crack propagation and damage of rock under uniaxial compression based on global strain field analysis[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(4)：763–769.(in Chinese))
[17] 杨小彬，韩心星，刘恩来，等 单轴循环加卸载岩石非均匀变形演化特征[J]. 煤炭学报，2018，43(2)：449–456.(YANG Xiaobin，HAN Xinxing，LIU Enlai，et al. Properties of non-uniform deformation evolution of rock under uniaxial cyclic loading and unloading[J]. Journal of China Coal Society，2018，43(2)：449–456.(in Chinese))
[18] 杨小彬，韩心星，刘恩来，等. 循环加卸载下花岗岩非均匀变形演化的声发射特征试验研究[J]. 岩土力学，2018，39(8)：2 732–2 739. (YANG Xiaobin，HAN Xinxing，LIU Enlai，et al. Experimental study on the acoustic emission characteristics of non-uniform deformation evolution of granite under cyclic loading and unloading test[J]. Rock and Soil Mechanics，2018，39(8)：2 732–2 739.(in Chinese))
[19] JIN Y，QI Z，CHEN M，et al. Time-sensitivity of the Kaiser effect of acoustic emission in limestone and its application to measurements of in-situ stress[J]. Petroleum Science，2009，(2)：176–180.
[20] PAPARGYRIS A D，COOKE R G，PAPARGYRI S A. The acoustic behaviour of bricks in relation to their mechanical behaviour[J]. Construction and Building Materials，2001，15(7)：361–369.
[21] LAVROV A. The Kaiser effect in rocks：principles and stress estimation techniques[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(2)：151–171.
[22] SONG H P，ZHANG H，FU D H，et al. Experimental analysis and characterization of damage evolution in rock under cyclic loading[J]. International Journal of Rock Mechanics and Mining Sciences，2016，88：157–164. |
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2022, Vol. 41 
