盐岩应变硬化自弱化现象研究

doi:10.13722/j.cnki.jrme.2014.1356

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (323 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要为探究盐岩的应变硬化自弱化现象及机制，拟通过单轴压缩卸载、静置、二次加载试验来研究盐岩自弱化后强度指标和变形指标的变化规律。并基于位错理论，对自弱化的微观机制进行阐述。研究结果表明：(1) 盐岩自弱化后的强度和弹性模量随静置时间(弱化时间)的变长而呈现弱化趋势；且4 h之前弱化趋势明显，之后趋势特征不明显。(2) 盐岩弱化后的泊松比和等容变形率在4 h前后有台阶特征。泊松比的前台阶值小于后台阶值，等容变形率的前台阶值大于后台阶值。(3) 盐岩自弱化现象是应变硬化后位错在内部残余应力(摩擦力和位错弹性力)的作用下逐渐远离集中区，均匀化的结果。

	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

关键词 ：岩石力学, 盐岩, 应变硬化, 自弱化, 位错, 等容变形率

Abstract：In order to explore the mechanisms that govern the self-weakening of strain hardening of salt rock，the tests under uniaxial compression unloading，standing still and second time loading were performed with the variation of indices of strength and strain obtained in this study. The micro-mechanism of the phenomenon of self-weakening of strain hardening was explained with the dislocation theory. After self-weakening，the peak strength and elastic modulus of rock salt in the second loading period exhibited a weakening trend with the interval time between two times loading tests. When the interval time was less than 4 h，the strength indices decreased sharply. While for the case of more than 4 h，no evident decrease was observed. When the interval time was approximately 4 h，Poisson?s ratio and isometric deformation rate of salt rock jumped upward and downward. The self-weakening effect was resulted from the behavior of crystal dislocations that was removed away from original dislocation accumulation zone due to the drive of residual stress(mainly friction and unevenly elastic dislocation force).

Key words： rock mechanics salt rock strain hardening self-weakening dislocation isochoric deformation rate

引用本文:

陈结1，2，范金洋1，姜德义1，吴建勋1，刘剑兴1. 盐岩应变硬化自弱化现象研究[J]. 岩石力学与工程学报, 2015, 34(08): 1612-1618.
CHEN Jie1，2，FAN Jinyang1，JIANG Deyi1，WU Jianxun1，LIU Jianxing1. STUDY ON PHENOMENON OF SELF-WEAKENING OF STRAIN HARDENING OF SALT ROCK. , 2015, 34(08): 1612-1618.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1356 或 http://www.rockmech.org/CN/Y2015/V34/I08/1612

[3]	DRURY M R，URAI J L. Deformation-related recrystallization processes[J]. Tectonophysic，1990，172(3/4))：235-253. " target="_blank">
[5]	HAKAN A. Percolation model for dilatancy-induced permeability of the excavation damaged zone in rock salt[J]. International Journal of Rock Mechanics and Mining Sciences，2008，46(2009)：716-724. " target="_blank">
[7]	姜德义，范金洋，陈结，等. 盐岩在围压卸荷作用下的扩容特征研究[J]. 岩土力学，2013，7：1 881-1 886.(JIANG Deyi，FAN Jinyang，CHEN Jie，et al. Study on the characteristics of the salt?s capacity expansion under the action of confining pressure unloading[J]. Rock and Soil Mechanics，2013，7：1 881-1 886.(in Chinese)) " target="_blank">
[9]	殷德顺，和成亮，陈文. 岩土应变硬化指数理论及其分数阶微积分理论基础[J]. 岩土工程学报，2010，32(5)：762-766.(YIN Deshun， HE Chengliang， CHEN Wen. Theory of geotechnical strain hardening index and its rationale from fractional order calculus[J]. Chinese Journal of Geotechnical Engineering，2010，32(5)762-766. (in Chinese))
[10]	蔡向荣. 超高韧性水泥基复合材料基本力学性能和应变硬化过程理论分析[D]. 大连：大连理工大学，2010.(CAI Xiangrong. The basic mechanical performance and strain hardening process theoretical analysis of ultra high toughness cementitious composites[D]. Dalian：Dalian university of technology，2010.(in Chinese)) " target="_blank">
[11]	方健，魏毅静，王承忠. 拉伸应变硬化指数的解析测定及力学分析[J]. 塑性工程学报. 2003，10(3)：12-17.(FANG Jian，WEI Yijing，WANG Chengzhong. Analytical measurement and mechanical analysis of tensile strain hardening exponent[J]. Journal of plasticity engineering，2003，10(3)：12-17.(in Chinese)) " target="_blank">
[8]	刘建锋，徐进，杨春和，等. 盐岩拉伸破坏力学特性的试验研究[J]. 岩土工程学报，2011，33(4)：580-586.(LIU Jianfeng，XU Jin，YANG Chunhe，et al. Mechanical characteristics of tensile failure of salt rock[J]. Chinese Journal of Geotechnical Engineering，2011，33(4)：580-586.(in Chinese))
[12]	代启峰，宋仁伯，范午言，等. DP1180双相钢在高应变速率变形条件下应变硬化行为及机制[J]. 金属学报，2012，48(10)：1 650-1 655. (DAI Qifeng，SONG Renbo，FAN Wuyan，et al. Behaviour and mechanism of strain hardening for dual phase steel DP1180 under high strain rate deformation[J]. Acta metallurgica sinica，2012，48(10)： 1 650-1 655.(in Chinese))
[14]	HOUBEN M E，HOVE A T，PEACH C J，et al. Crack healing in rocksalt via diffusion in adsorbed aqueous films：Microphyysical modelling versus experiments[J]. physical and chemistry of the Earth，2012. " target="_blank">
[16]	WATANABE T，PEACH C J. Electrical impedance measurement of plastically deforming halite rocks at 125 ℃ and 50 MPa[J]. Journal of Geophysical Research，2004，107(B1)：pp. ECV2-1. " target="_blank">
[21]	王仲仁，苑世剑，胡连喜. 弹性与塑性力学基础[M]. 哈尔滨：哈尔滨工业大学出版社，1997. " target="_blank">
[2]	Ter Heege JH，De Bresser JHP，SPIERS C J. Dynamic recrystallization of wet synthetic polycrystalline halite：dependence of grain size distribution on flow stress，temperature and strain[J]. Tectonophysics，2005，396(1/2))：35-57. " target="_blank">
[4]	姜德义，范金洋，陈结，等. 应力因素下的岩盐卸荷扩容试验研究[J]. 岩土力学，2013，34(增1))：41-46.(JIANG Deyi，FAN Jinyang，CHEN Jie，et al. Test study of unloading capacity expansion characteristics of salt rock under stress factors[J]. Rock and Soil Mechanics，2013，34(Supp.1))：41-46.(in Chinese)) " target="_blank">
[1]	CHAN K S，MUNSON D E，BONDER S R. Recovery and healing of damage in WIPP salt[J]. International Journal of Damage Mechanics，1998，7(2))：143-166. " target="_blank">
[6]	纪文栋，杨春和，姚院峰，等. 应变加载速率对盐岩力学性能的影响[J]. 岩石力学与工程学报，2011，30(12)：2 507-2 513.(JI Wendong，YANG Chunhe，YAO Yuanfeng，et al. Effects of loading strain rate on mechanical performances of salt rock[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(12)：2 507-2 513.(in Chinese))
[13]	宋玉泉，海锦涛，管志平. 拉伸变形应变硬化指数的力学解析[J]. 中国科学(E辑)，2001，31(2)：103-108.(SONG Yuquan，HAI Jintao，GUAN Zhiping. Tensile deformation strain hardening exponent analytical mechanics[J]. Science in China，2001，31(2)：103-108.(in Chinese))
[15]	姜德义，范金洋，陈结，等. 围压卸载速率对盐岩扩容损伤影响研究[J]. 岩石力学与工程学报，2013，(增2)：3 154-3 159.(JIANG Deyi，FAN Jinyang，CHEN Jie，et al. Research on capacity expansion damage of the salt under the different rate of confining pressure unloading[J]. Chinese Journal of Rock Mechanics and Engineering，2013，(Supp.2)：3 154-3 159.(in Chinese)) " target="_blank">
[17]	HOUBEN M E，HOVE A T，PEACH C J，et al. Crack healing in rocksalt via diffusion in adsorbed aqueous films：Microphyysical modelling versus experiments[J]. physical and chemistry of the Earth， 2012 " target="_blank">
[19]	钱才富. 位错和位错偶沿单一滑移系从裂纹尖端的发射[J]. 金属学报，1999，(5)：546-550.(QIAN Caifu. Dislocation and dislocation along a single slip system from crack tip emission[J]. Acta Metallurgica Sinica，1999，(5)：546-550.(in Chinese)) " target="_blank">
[18]	MAS D，CHEMENDA A I. Dilatancy factor constrained from the experimental data for rocks and rock-type material[J]. International Journal of Rock Mechanics and Mining Sciences，2014，(67)：136-144. " target="_blank">
[20]	赵敬世. 位错理论基础[M]. 北京：国防工业出版社，1989. " target="_blank">