峰前卸荷损伤灰岩的再加载力学性能研究

doi:10.13722/j.cnki.jrme.2022.0847

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1229 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要开挖卸荷导致岩体产生卸荷损伤效应，卸荷损伤岩体在荷载作用下的力学性能直接影响工程岩体的稳定和安全，基于此，设计进行灰岩的卸荷损伤试验和损伤岩样的再加载试验。研究结果表明：(1) 初始卸荷损伤对岩石的变形和承载性能影响显著，在卸荷量大于80%时，其抗压强度、变形模量、应变围压柔量均呈现非线性突变趋势；(2) 根据加卸载过程中岩石由稳定破坏向不稳定破坏转变的特点，提出采用耗散能占比来判断卸荷过程中的临界损伤状态，耗散能占比以0.33左右为界限，小于0.33时，初始卸荷损伤对其再加载性能影响较小，大于0.33时，初始卸荷损伤对其再加载性能影响显著；(3) 卸荷过程中，岩样的弹性能和耗散能密度占比呈此消彼长的规律，根据卸荷阶段耗散能增长与岩样损伤发育的相关关系，提出了采用卸荷阶段耗散能与卸荷破坏耗散能比值的方法表示其视观损伤变量；(4) 随着卸荷量增大，损伤岩样再加载时的破坏模式由典型剪切破坏，逐渐向剪张和张剪破坏模式发展；(5) 对卸荷损伤岩样施加一定的侧向应力，可以在一定程度控制张拉裂纹的发展，进而提高其承载能力。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	邓华锋1
	陈天楠1
	李建林1
	肖瑶1
	张恒宾1
	李涛1
	陈兴周2

关键词 ：岩石力学, 卸荷损伤, 再加载试验, 耗散能占比, 临界损伤状态, 视观损伤变量, 破坏模式

Abstract：The excavation unloading effect results in the unloading damage of rock，and the mechanical properties of unloading damage rock under load directly influence the stability and safety of engineering rock. Based on this，the unloading damage test of limestone and the reloading test of damaged rock samples are designed and carried out. The results show that：(1) The initial unloading damage has a significant impact on the deformation and bearing capacity of rock sample. When the unloading amount is greater than 80%，the compressive strength，deformation modulus and strain confining compliance show a nonlinear mutation trend. (2) On the basis of the characteristics of rock transformation from stable failure to unstable failure in the process of loading and unloading，the proportion of dissipated energy is proposed to determine the critical damage state of rock sample during unloading，the proportion of dissipated energy is about 0.33 as the limit. When the proportion of dissipated energy is less than 0.33，the initial unloading damage has little influence on its reloading performance. However，when the proportion of dissipated energy is greater than 0.33，the initial unloading damage has significant effect on its reloading performance. (3) During the unloading，there is a negative correlation between the proportion of elastic energy and the proportion of dissipated energy，therefore in accordance with the correlation between the growth of dissipated energy during unloading and the damage development of rock samples，the ratio of dissipated energy during unloading and dissipated energy in unloading failure is proposed to represent the visual damage variable. (4) With the increase of unloading amount，the failure mode of damaged rock sample under reloading is gradually transitioned from typical shear failure to shear-tensile failure and tensile-shear failure. (5) Applying a lateral stress to the unloading damage rock sample can control the development of tension cracks to a certain extent，and thus improve the bearing capacity of rock sample.

Key words： rock mechanics;unloading damage;reloading experimental;proportion of dissipated energy;critical damage state;visual damage variable failure mode

引用本文:

邓华锋1，陈天楠1，李建林1，肖瑶1，张恒宾1，李涛1，陈兴周2. 峰前卸荷损伤灰岩的再加载力学性能研究[J]. 岩石力学与工程学报, 2023, 42(6): 1301-1311.
DENG Huafeng1，CHEN Tiannan1，LI Jianlin1，XIAO Yao1，ZHANG Hengbin1，LI Tao1，CHEN Xingzhou2. Reloading experimental research on the mechanical properties of limestone considering pre-peak unloading damage#br#. , 2023, 42(6): 1301-1311.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0847 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I6/1301

[2]	哈秋舲，李建林，张永兴，等. 节理岩体卸荷非线性岩体力学[M]. 北京：中国建筑工业出版社，1998：7-40.(HA Qiuling，LI Jianlin， ZHANG Yongxing，et al. Jointed rock mass unloading nonlinear rock mechanics[M]. Beijing：China Construction Industry Press，1998：7-40.(in Chinese))
[4]	周火明，盛谦，李维树，等. 三峡船闸边坡卸荷扰动区范围及岩体力学性质弱化程度研究[J]. 岩石力学与工程学报，2004，23(7)：1 078-1 081.(ZHOU Huoming，SHENG Qian，LI Weishu，et al. Excavation-disturbed zone and weaken degree of mechanical properties for rock mass of TGP shiplock slop[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(7)：1 078-1 081.(in Chinese))
[6]	李新平，肖桃李，汪斌，等. 锦屏二级水电站大理岩不同应力路径下加卸载试验研究[J]. 岩石力学与工程学报，2012，31(5)：882-889.(LI Xinping，XIAO Taoli，WANG Bin，et al. Experimental study of Jinping II hydropower station marble under loading and unloading stress paths[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(5)：882-889.(in Chinese))
[8]	荣浩宇，李桂臣，赵光明，等. 不同应力路径下深部岩石真三轴卸荷特性试验[J]. 煤炭学报，2020，45(9)：3 140-3 149.(RONG Haoyu，LI Guichen，ZHAO Guangming，et al. True triaxial test study on mechanical properties of deep rock mass in different stress paths[J]. Journal of China Coal Society，2020，45(9)：3 140-3 149.(in Chinese))
[12]	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))
[14]	李宏哲，夏才初，闫子舰，等. 锦屏水电站大理岩在高应力条件下的卸荷力学特性研究[J]. 岩石力学与工程学报，2007，26(10)：2 104-2 109.(LI Hongzhe，XIA Caichu，YAN Zijian，et al. Study on marble unloading mechanical properties of Jinping hydropower station under high geostress conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：2 104-2 109.(in Chinese))
[16]	薄英鋆，王华宁，蒋明镜. 深部节理岩体开挖卸荷动力破坏机制的离散元研究[J]. 岩土工程学报，2020，42(增2)：196-201.(BO Yingjun，WANG Huaning，JIANG Mingjing. Cracking mechanism of deep jointed rock mass induced by transient excavation via DEM[J]. Chinese Journal of Geotechnical Engineering，2020，42(Supp.2)：196-201.(in Chinese))
[18]	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 condition based on nuclear magnetic resonance technique[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(Supp.2)：3 523-3 530.(in Chinese))
[22]	ZHANG L M，CONG Y，MENG F Z，et al. Energy evolution analysis and failure criteria for rock under different stress paths[J]. Acta Geotechnia，2021，16(2)：569-580.
[24]	DAI B，GUO Y Z，KONIETZKY H，et al. Experimental investigation on damage evolution behaviour of a granitic rock under loading and unloading[J]. Journal of Central South University，2018，25(5)：1 213-1 225.
[26]	QIU S L，FENG X T，XIAO J Q，et al. An experimental study on the pre-peak-unloading damage evolution of marble[J]. Rock Mechanics and Rock Engineering，2014，47(2)：401-409.
[28]	王瑞红，李建林，蒋昱州，等. 考虑岩体开挖卸荷边坡岩体质量评价[J]. 岩土力学，2008，29(10)：2 741-2 746.(WANG Ruihong，LI Jianlin，JIANG Yuzhou，et al. Quality evaluation of unloaded slope rock mass[J]. Rock and Soil Mechanics，2008，29(10)：2 741- 2 746.(in Chinese))
[31]	李景龙，朱子涵，蔚立元，等. 大理岩峰前卸荷损伤表征及再承载破坏耗能特征[J]. 岩石力学与工程学报，2020，39(12)：2 429-2 438. (LI Jinglong，ZHU Zihan，YU Liyuan，et al. Dissipative characteristics investigation of marble during reloading process considering pre-peak unloading damage[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(12)：2 429-2 438.(in Chinese))
[9]	刘婕，张黎明，丛宇，等. 真三轴应力路径花岗岩卸荷破坏力学特性研究[J]. 岩土力学，2021，42(8)：2 069-2 077.(LIU Jie，ZHANG Liming，CONG Yu，et al. Research on the mechanical characteristics of granite failure process under true triaxial stress path[J]. Rock and Soil Mechanics，2021，42(8)：2 069-2 077.(in Chinese))
[19]	任建喜，葛修润，蒲毅彬，等. 岩石卸荷损伤演化机制CT实时分析初探[J]. 岩石力学与工程学报，2000，19(6)：697-701.(REN Jianxi，GE Xiurun，PU Yibin，et al. Primary study of real-time CT testing of unloading damage evolution law of rock[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(6)：697-701.(in Chinese))
[29]	朱杰兵，汪斌，邬爱清. 锦屏水电站绿砂岩三轴卸荷流变试验及非线性损伤蠕变本构模型研究[J]. 岩石力学与工程学报，2010，29(3)：528-534.(ZHU Jiebing，WANG Bin，WU Aiqing. Influence of confining pressure unloading at post-peak on deformation and permeability characteristics of raw coal[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：528-534.(in Chinese))
[32]	邓华锋，李建林，邓成进，等. 岩石力学试验中岩样选择和抗压强度预测方法研究[J]. 岩土力学，2011，32(11)：3 399-3 403.(DENG Huafeng，LI Jianlin，DENG Chengjin，et al. Analysis of sampling in rock mechanics test and compressive strength prediction methods[J]. Rock and Soil Mechanics，2011，32(11)：3 399-3 403.(in Chinese))
[34]	谢和平，鞠杨，董毓利. 经典损伤定义中的“弹性模量法”探讨[J]. 力学与实践，1997，19(2)：2-6.(XIE Heping，JU Yang，DONG Yuli. Research on plastic modulus method for classical damage mechanical definition[J]. Mechanical and Practice，1997，19(2)：2-6.(in Chinese))
[36]	尹光志，马波，刘超，等. 真三轴应力条件下加卸荷速率对砂岩力学特性与能量特征的影响[J]. 煤炭学报，2019，44(2)：454- 462.(YIN Guangzhi，MA Bo，LIU Chao，et al. Effect of loading and unloading rates on mechanical properties and energy characteristics of sandstone under true triaxial stress[J]. Journal of China Coal Society，2019，44(2)：454-462.(in Chinese))
[27]	李建林，王乐华，孙旭曙. 节理岩体卸荷各向异性力学特性试验研究[J]. 岩石力学与工程学报，2014，33(5)：892-900.(LI Jianlin，WANG Lehua，SUN Xushu. Experimental study on anisotropic mechanical characteristics of jointed rock masses under unloading condition[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(5)：892-900.(in Chinese))
[37]	温韬，唐辉明，刘佑荣. 不同围压下板岩三轴压缩过程能量及损伤分析[J]. 煤田地质与勘探，2016，44(3)：80-86.(WEN TAO，TANG Huiming，LIU Yourong. Energy and damage analysis of slate during triaxial compression under differed confining pressures[J]. Coal Geology and Exploration，2016，44(3)：80-86.(in Chinese))
[30]	朱子涵，蔚立元，孟庆彬，等. 峰前卸荷损伤大理岩的动静力学特性试验研究[J]. 岩石力学与工程学报，2019，38(4)：747-756.(ZHU Jiebing，WANG BIN，WU Aiqing，et al. Experimental study on dynamic and static characteristics of marble considering pre-peak unloading damage[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(4)：747-756.(in Chinese))
[33]	徐颖，李成杰，郑强强，等. 循环加卸载下泥岩能量演化与损伤特性分析[J]. 岩石力学与工程学报，2019，38(10)：2 084-2 091. (XU Ying，LI Chengjie，ZHENG Qiangqiang，et al. Analysis of energy evolution and damage characteristics of mudstone under cyclic loading and unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(10)：2 084-2 091.(in Chinese))
[35]	谢和平，鞠杨，黎立云，等. 岩体变形破坏过程的能量机制[J]. 岩石力学与工程学报，2008，27(9)：1 729-1 740.(XIE Heping，JU Yang，LI Liyun，et al. Energy mechanism of deformation and failure of rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(9)：1 729-1 740.(in Chinese))
[1]	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)：93-98.(HA Qiuling. Rock slope engineering and unloading nonlinear rock(body) mechanics[J]. Chinese Journal of Rock Mechanics and Engineering，1997，16(4)：93-98.(in Chinese))
[3]	李建林，黄天柱，张恒宾，等. 卸荷岩体力学试验研究进展与展望[J]. 三峡大学学报：自然科学版，2022，44(1)：1-13.(LI Jianlin，HUANG Tianzhu，ZHANG Hengbin，et al. Research review and prospect in experimental studies for unloading rock mass mechanics[J]. Journal of China Three University：Natural Science，2022，44(1)：1-13.(in Chinese))
[5]	FENG X T，XU H，YANG C，et al. Influence of loading and unloading stress paths on the deformation and failure features of Jinping marble under true triaxial compression[J]. Rock Mechanics and Rock Engineering，2020，53(1)：3 287-3 301.
[7]	丛宇，王在泉，郑颖人，等. 不同卸荷路径下大理岩破坏过程能量演化规律[J]. 中南大学学报：自然科学版，2016，47(9)：3 140-3 147. (CONG Yu，WANG Zaiquan，ZHENG Yingren，et al. Energy evolution principle of fracture propagation of marble with different unloading stress paths[J]. Journal of Central South University：Science and Technology，2016，47(9)：3 140-3 147.(in Chinese))
[10]	黄润秋，黄达. 高地应力条件下卸荷速率对锦屏大理岩力学特性影响规律试验研究[J]. 岩石力学与工程学报，2010，29(1)：21-33. (HUANG Runqiu，HUANG Da. Experimental research on affection laws of unloading rates on mechanical properties of Jinping marble under high geostress[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：21-33.(in Chinese))
[11]	谢和平，周宏伟，刘建锋，等. 不同开采条件下采动力学行为研究[J]. 煤炭学报，2011，36(7)：1 067-1 074.(XIE Heping，ZHOU Hongwei，LIU Jianfeng，et al. Mining-induced mechanical behavior in coal seams under different mining layouts[J]. Journal of China Coal Society，2011，36(7)：1 067-1 074.(in Chinese))
[13]	苏国韶，陈智勇，蒋剑青，等. 不同加载速率下岩爆碎块耗能特征试验研究[J]. 岩土工程学报，2016，38(8)：1 481-1 489.(SU Guoshao，CHEN Zhiyong，JIANG Jianqing，et al. Experimental study on energy dissipating characteristics of rockburst fragments under different loading rates[J]. Chinese Journal of Geotechnical Engineering，2016，38(8)：1 481-1 489.(in Chinese))
[15]	黄达，谭清，黄润秋. 高围压卸荷条件下大理岩破碎块度分形特征及其与能量相关性研究[J]. 岩石力学与工程学报，2012，31(7)：1 379-1 389.(HUANG Da，TAN Qing，HUANG Runqiu. Fractal characteristics of fragmentation and correlation with energy of marble under unloading with high confining pressure[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(7)：1 379-1 389. (in Chinese))
[17]	LI B，DING Q F，XU N W，et al. Mechanical response and stability analysis of rock mass in high geostress underground powerhouse caverns subjected to excavation[J]. Journal of Central South University，2020，27(10)：2 971-2 984.
[20]	俞缙，李宏，陈旭，等. 砂岩卸围压变形过程中渗透特性与声发射试验研究[J]. 岩石力学与工程学报，2014，33(1)：69-79. (YU Jin，LI Hong，CHEN Xu，et al. Experimental study of permeability and acoustic emission characteristics of sandstone during processes of unloading confining pressure and deformation[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(1)：69-79.(in Chinese))
[21]	张黎明，高速，王在泉，等. 大理岩加卸荷破坏过程的能量演化特征分析[J]. 岩石力学与工程学报，2013，32(8)：1 572-1 578. (ZHANG Liming，GAO Su，WANG Zaiquan，et al．Analysis of marble failure energy evolution under loading and unloading conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(8)：1 572-1 578.(in Chinese))
[23]	彭瑞东，鞠杨，高峰，等. 三轴循环加卸载下煤岩损伤的能量机制分析[J]. 煤炭学报，2014，39(2)：245-252.(PENG Ruidong，JU Yang，GAO Feng，et al. Energy analysis on damage of coal under cyclical triaxial loading and unloading conditions[J]. Journal of China Coal Society，2014，39(2)：245-252.(in Chinese))
[25]	沈军辉，王兰生，王青海，等. 卸荷岩体的变形破裂特征[J]. 岩石力学与工程学报，2003，22(12)：2 028-2 031.(SHEN Junhui，WANG Lansheng，WANG Qinghai，et al. Deformation and fracture features of unloaded rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22 (12)：2 028-2 031.(in Chinese))