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| Experimental study on mechanical characteristics of cemented backfill under triaxial unloading confining pressure after cured at different temperatures |
| LIU Weizhen1，GUO Zhongping1，HUANG Wanpeng1，2，NIU Shiwei1，HOU Jifeng1，3 |
| (1. College of Energy and Mining Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；2. State Key Laboratory of Coal Mining and Clean Utilization，China Coal Research Institute，Beijing 100013，China； 3. College of Coal Engineering，Shanxi Datong University，Datong，Shanxi 037009，China) |
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Abstract In order to study the unloading mechanical characteristics of cemented backfill in the high geothermal environment of deep coal mine，RTX–4000 rock dynamic triaxial apparatus was used to carry out the conventional triaxial unloading confining pressure test under different initial unloading confining pressures on cemented backfill after cured at different temperatures(20 ℃，35 ℃ and 50 ℃). The deviatoric stress-strain curve of cemented backfill during the whole triaxial unloading process was obtained，and its deformation，failure characteristics and strength criterion were analyzed. The results show that the harmful thermal stress inside cemented backfill after cured at 50 ℃ is easy to cause the stress-strain curve of cemented backfill under unloading to appear micro-rupture phenomenon in the post-peak stage，and then makes the deformation modulus drop suddenly and increase reversely in the process of unloading confining pressure. The unloading failure forms of cemented backfill are mainly local tension cracks，shear cracks and dislocation cracks，in which the dislocation cracks are caused by thermal damage and mechanical damage. Mogi-Coulomb strength criterion can better characterize the unloading failure strength characteristics of cemented backfill under the condition of increasing axial pressure and unloading confining pressure. With the increase of curing temperature，the cohesive force of cemented backfill decreases first and then increases，and the internal friction angle increases first and then decreases. The change of cohesive force is consistent with the change law of unloading peak strength. The greater the cohesive force，the higher the unloading peak strength，indicating that cohesive force is the main factor affecting the unloading peak strength of cemented backfill.
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| [1] 杜明泽，康天合，尹 博，等. 粉煤灰充填材料早龄期物理力学特性及其水化过程分析[J]. 岩石力学与工程学报，2016，35(4)：826–836.(DU Mingze，KANG Tianhe，YIN Bo，et al. Physic-mechanical properties of fly ash filling material at early age and its hydration process[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(4)：826–836.(in Chinese))
[2] 吴再海，纪洪广，姜海强，等. 尾砂胶结含盐冻结充填体力学特性研究[J]. 岩土力学，2020，41(6)：1 874–1 880.(WU Zaihai，JI Hongguang，JIANG Haiqiang，et al. Study of mechanical properties of frozen saline cemented tailings backfill[J]. Rock and Soil Mechanics，2020，41(6)：1 874–1 880.(in Chinese))
[3] OREJARENA L，FALL M. Artificial neural network based modeling of the coupled effect of sulphate and temperature on the strength of cemented paste backfill[J]. Canadian Journal of Civil Engineering，2011，38(1)：100–109.
[4] ALI G，FALL M，ALAINACHI I. Time- and temperature-dependence of rheological properties of cemented tailings backfill with sodium silicate[J]. Journal of Materials in Civil Engineering，2021，33(3)：04020498.
[5] ALAINACHI I，FALL M. Chemically induced changes in the geotechnical response of cementing paste backfill in shaking table test[J]. Journal of Rock Mechanics and Geotechnical Engineering，2021，13(3)：513–528.
[6] 吴 刚. 岩体在加、卸荷条件下破坏效应的对比分析[J]. 岩土力学，1997，18(2)：13–16.(WU Gang. Comparison of failure effects of rock mass under loading and unloading conditions[J]. Rock and Soil Mechanics，1997，18(2)：13–16.(in Chinese))
[7] 周维垣，杨若琼，剡公瑞. 岩体边坡非连续非线性卸荷及流变分析[J]. 岩石力学与工程学报，1997，16(3)：210–216.(ZHOU Weiyuan，YANG Ruoqiong，YAN Gongrui. Nonlinear and discontinuous deformation and rheological analysis for unloaded rock slopes[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(3)：210–216.(in Chinese))
[8] 哈秋舲. 岩石边坡工程与卸荷非线性岩石(体)力学[J]. 岩石力学与工程学报，1997，16(4)：386–391.(HA Qiuling. Rock slope engineering and unloading nonlinear rock mass mechanics[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(4)：386–391.(in Chinese))
[9] 哈秋舲. 加载岩体力学与卸荷岩体力学[J]. 岩土工程学报，1998，20(1)：114.(HA Qiuling. Loading rock mass mechanics and unloading rock mass mechanics[J]. Chinese Journal of Geotechnical Engineering，1998，20(1)：114.(in Chinese))
[10] 尤明庆，华安增. 岩石试样的三轴卸围压试验[J]. 岩石力学与工程学报，1998，17(1)：24–29.(YOU Mingqing，HUA Anzeng. Triaxial confining depressure test of rock sample[J]. Chinese Journal of Rock Mechanics and Engineering，1998，17(1)：24–29.(in Chinese))
[11] 黄润秋，黄 达. 卸荷条件下花岗岩力学特性试验研究[J]. 岩石力学与工程学报，2008，27(11)：2 205–2 213.(HUANG Runqiu，HUANG Da. Experimental research on mechanical properties of granites under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(11)：2 205–2 213.(in Chinese))
[12] 郭印同，杨春和，付建军. 盐岩三轴卸荷力学特性试验研究[J]. 岩土力学，2012，33(3)：725–730.(GUO Yintong，YANG Chunhe，FU Jianjun. Experimental research on mechanical characteristics of salt rock under triaxial unloading test[J]. Rock and Soil Mechanics，2012，33(3)：725–730.(in Chinese))
[13] 赵国斌，周建军，王思敬. 卸荷条件下灰岩力学特性研究[J]. 岩石力学与工程学报，2013，32(增2)：2 994–2 999.(ZHAO Guobin，ZHOU Jianjun，WANG Sijing. Study of mechanical characteristics of limestone under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(Supp.2)：2 994–2 999.(in Chinese))
[14] 王在泉，张黎明，孙 辉，等. 不同卸荷速度条件下灰岩力学特性的试验研究[J]. 岩土力学，2011，32(4)：1 045–1 050.(WANG Zaiquan，ZHANG Liming，SUN Hui，et al. Experimental study of mechanical properties of limestone under different unloading velocities[J]. Rock and Soil Mechanics，2011，32(4)：1 045–1 050.(in Chinese))
[15] 邱士利，冯夏庭，张传庆，等. 不同卸围压速率下深埋大理岩卸荷力学特性试验研究[J]. 岩石力学与工程学报，2010，29(9)：1 807–1 817.(QIU Shili，FENG Xiating，ZHANG Chuanqing，et al. Experimental research on mechanical properties of deep-buried marble under different unloading rates of confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(9)：1 807–1 817.(in Chinese))
[16] 李地元，孙 志，李夕兵，等. 不同应力路径下花岗岩三轴加卸载力学响应及其破坏特征[J]. 岩石力学与工程学报，2016，35(增2)：3 449–3 457.(LI Diyuan，SUN Zhi，LI Xibing，et al. Mechanical response and failure characteristics of granite under different stress paths in triaxial loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(Supp.2)：3 449–3 457.(in Chinese))
[17] 赵国彦，戴 兵，董陇军，等. 不同应力路径下岩石三轴卸荷力学特性与强度准则研究[J]. 岩土力学，2015，36(11)：3 121–3 127. (ZHAO Guoyan，DAI Bing，DONG Longjun，et al. Experimental research on mechanical characteristics and strength criterion of rock of triaxial unloading tests under different stress paths[J]. Rock and Soil Mechanics，2015，36(11)：3 121–3 127.(in Chinese))
[18] 王云飞，焦华喆，李 震，等. 白砂岩卸围压强度与损伤破坏特征[J]. 煤炭学报，2020，45(8)：2 787–2 794.(WANG Yunfei，JIAO Huazhe，LI Zhen，et al. Strength and damage failure characteristics of white sandstone under unloading confining pressure[J]. Journal of China Coal Society，2020，45(8)：2 787–2 794.(in Chinese))
[19] 李建林，王瑞红，蒋昱州，等. 砂岩三轴卸荷力学特性试验研究[J]. 岩石力学与工程学报，2010，29(10)：2 034–2 041.(LI Jianlin，WANG Ruihong，JIANG Yuzhou，et al. Experimental study of sandstone mechanical properties by unloading triaxial tests[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(10)：2 034–2 041.(in Chinese))
[20] 刘泉声，刘恺德，卢兴利，等. 高应力下原煤三轴卸荷力学特性研究[J]. 岩石力学与工程学报，2014，33(增2)：3 429–3 438.(LIU Quansheng，LIU Kaide，LU Xingli，et al. Study of mechanical properties of raw coal under high stress with triaxial unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：3 429–3 438.(in Chinese))
[21] 陈学章，何江达，肖明砾，等. 三轴卸荷条件下大理岩扩容与能量特征分析[J]. 岩土工程学报，2014，36(6)：1 106–1 112.(CHEN Xuezhang，HE Jiangda，XIAO Mingli，et al. Dilatancy and energy properties of marble under triaxial unloading condition[J]. Chinese Journal of Geotechnical Engineering，2014，36(6)：1 106–1 112.(in Chinese))
[22] 金爱兵，刘佳伟，赵怡晴，等. 卸荷条件下花岗岩力学特性分析[J]. 岩土力学，2019，40(增1)：459–467.(JIN Aibing，LIU Jiawei，ZHAO Yiqing，et al. Mechanical characteristics analysis of granite under unloading conditions[J]. Rock and Soil Mechanics，2019，40(Supp.1)：459–467.(in Chinese))
[23] 陈卫忠，刘豆豆，杨建平，等. 大理岩卸围压幂函数型Mohr强度特性研究[J]. 岩石力学与工程学报，2008，27(11)：2 214–2 220. (CHEN Weizhong，LIU Doudou，YANG Jianping，et al. Power function based mohr strength criterion for marble with unloading confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(11)：2 214–2 220.(in Chinese))
[24] 周科平，胡振襄，李杰林，等. 基于核磁共振技术的大理岩卸荷损伤演化规律研究[J]. 岩石力学与工程学报，2014，33(增2)：3 523–3 530.(ZHOU Keping，HU Zhenxiang，LI Jielin，et al. Study of marble damage evolution laws under unloading conditions based on nuclear magnetic resonance technique[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：3 523–3 530.(in Chinese))
[25] WANG J，FU J X，SONG W D. Mechanical properties and microstructure of layered cemented paste backfill under triaxial cyclic loading and unloading[J]. Construction and Building Materials，2020，257：119 540.
[26] WANG J，SONG W D，CAO S，et al. Mechanical properties and failure modes of stratified backfill under triaxial cyclic loading and unloading[J]. International Journal of Mining Science and Technology，2019，29(5)：809–814.
[27] 宋卫东，汪 杰，谭玉叶，等. 三轴加–卸载下分层充填体能耗及损伤特性[J]. 中国矿业大学学报，2017，46(5)：1 050–1 057.(SONG Weidong，WANG Jie，TAN Yuye，et al. Energy consumption and damage characteristics of stratified backfill under triaxial loading and unloading[J]. Journal of China University of Mining and Technology，2017，46(5)：1 050–1 057.(in Chinese))
[28] 龚 囱，李长洪，赵 奎. 加卸荷条件下胶结充填体声发射b值特征研究[J]. 采矿与安全工程学报，2014，31(5)：788–794.(GONG Cong，LI Changhong，ZHAO Kui. Experimental study on b-value characteristics of acoustic emission of cemented filling body under loading and unloading test[J]. Journal of Mining and Safety Engineering，2014，31(5)：788–794.(in Chinese))
[29] LIU W Z，GUO Z P，WANG C，et al. Physico-mechanical and microstructure properties of cemented coal Gangue-Fly ash backfill：Effects of curing temperature[J]. Construction and Building Materials，2021，299：124 011.
[30] 黄 兴，刘泉声，刘恺德，等. 深部软弱地层TBM掘进围岩变形破坏特性室内试验研究[J]. 岩石力学与工程学报，2015，34(1)：76–92.(HUANG Xing，LIU Quansheng，LIU Kaide，et al. Laboratory study of deformation and failure of soft rock for deep ground tunnelling with TBM[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(1)：76–92.(in Chinese))
[31] 方前程，商 丽，商拥辉，等. 加轴压卸围压条件下岩石的力学特性与能量特征[J]. 中南大学学报：自然科学版，2016，47(12)：4 148–4 153.(FANG Qiancheng，SHANG Li，SHANG Yonghui，et al. Mechanical and energy characteristics of granites under unloading test[J]. Journal of Central South University：Science and Technology，2016，47(12)：4 148–4 153.(in Chinese))
[32] 朱子涵，蔚立元，李景龙，等. 峰前卸荷大理岩变形演化规律及破坏耗能特征[J]. 煤炭学报，2020，45(增1)：181–190.(ZHU Zihan，YU Liyuan，LI Jinglong，et al. Deformation evolution and dissipated energy characteristics of marble under pre-peak unloading conditions[J]. Journal of China Coal Society，2020，45(Supp.1)：181–190.(in Chinese))
[33] 李 涛. 不同应力路径下粉砂岩力学特性及卸荷本构模型研究[硕士学位论文][D]. 徐州：中国矿业大学，2015.(LI Tao. Siltstone?s mechanical properties in different stress paths and research of unloading constitutive model[M. S. Thesis][D]. Xuzhou：China University of Mining and Technology，2015.(in Chinese))
[34] XU W B，LIU B，WU W L. Strength and deformation behaviors of cemented tailings backfill under triaxial compression[J]. Journal of Central South University，2020，27(12)：3 531–3 543.
[35] 陈宗平，陈宇良，应武挡. 再生混凝土三向受压试验及强度准则[J]. 建筑材料学报，2016，19(1)：149–155.(CHEN Zongping，CHEN Yuliang，YING Wudang. Mechanical behavior and strength criterion of recycled aggregate concrete(RAC) under triaxial compression[J]. Journal of Building Materials，2016，19(1)：149–155.(in Chinese))
[36] 吕颖慧，刘泉声，胡云华. 基于花岗岩卸荷试验的损伤变形特征及其强度准则[J]. 岩石力学与工程学报，2009，28(10)：2 096–2 103. (LV Yinghui，LIU Quansheng，HU Yunhua. Damage deformation characteristics and its strength criterion based on unloading experiments of granites[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(10)：2 096–2 103.(in Chinese))
[37] 张黎明，王在泉，石 磊. 硬质岩石卸荷破坏特性试验研究[J]. 岩石力学与工程学报，2011，30(10)：2 012–2 018.(ZHANG Liming，WANG Zaiquan，SHI Lei. Experimental study of hard rock failure characteristic under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(10)：2 012–2 018.(in Chinese))
[38] 李地元，谢 涛，李夕兵，等. Mogi-Coulomb强度准则应用于岩石三轴卸荷破坏试验的研究[J]. 科技导报，2015，33(19)：84–90.(LI Diyuan，XIE Tao，LI Xibing，et al. On the Mogi-Coulomb strength criterion as applied to rock triaxial unloading test[J]. Science and Technology Review，2015，33(19)：84–90.(in Chinese))
[39] AL-AJMI A M，ZIMMERMAN R W. Relation between the Mogi and the Coulomb failure criterion[J]. International Journal of Rock Mechanics and Mining Sciences，2005，42(3)：431–439.
[40] AL-AJMI A M，ZIMMERMAN R W. Stability analysis of vertical boreholes using the Mogi-Coulomb failure criterion[J]. International Journal of Rock Mechanics and Mining Sciences，2006，43(8)：1 200–1 211. |
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2022, Vol. 41 
