|
|
|
| EFFECTS OF LOADING STRAIN RATE ON MECHANICAL PERFORMANCES OF SALT ROCK |
| JI Wendong，YANG Chunhe，YAO Yuanfeng，KONG Junfeng |
| (State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
|
|
|
|
Abstract Through the triaxial compression test of salt rock under different confining pressures and loading strain rates，influences of loading strain rate on salt rock compressive strength，axial strain，radial strain，Young?s modulus and failure mode are analyzed. In the test scale of loading strain rate，it is found that the influencing characters of salt rock can be divided into three different stages，i.e. elastic stage in which loading strain rate has no effect on salt rock properties，preliminary plastic stage caused by compressive strength difference，and strain hardening stage caused by the stability of strength difference. The final result is that compressive strength increases with the increasing loading strain rate. Test samples under high loading rate have notable internal damage. Cracks appear in these samples are long and obvious which are different from the cracks under low loading rate. The uniaxial compression experiment is undertaken on the rock samples which have been loaded by triaxial compression test. It is found that the Young?s modulus becomes smaller as the loading rate increases，so high strain rate leads to inattentive internal structure and causes more serious structural damage of salt rock. Comparing test results under different confining pressures and combining with uniaxial compression test results，it is found that confining pressure is the precondition of whether the loading rate has influence on properties of salt rock. The higher the confining pressure is，more obvious the influence of loading strain rate on mechanical performances of salt rock is. From the results of experiment，analysis of different strain loading rates of every stage in construction and operation of salt rock cavern in actual project，several beneficial suggestions are proposed.
|
|
Received: 01 April 2011
|
|
|
|
| [1] 杨春和，梁卫国，魏东吼，等. 中国盐岩能源地下储存可行性研究[J]. 岩石力学与工程学报，2005，24(24)：4 409–4 417.(YANG Chunhe，LIANG Weiguo，WEI Donghou，et al. Investigation on possibility of energy storage in salt rock in China[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(24)：4 409–4 417.(in Chinese))
[2] 杨春和，李银平，屈丹安，等. 层状盐岩力学特性研究进展[J]. 力学进展，2008，38(4)：484–494.(YANG Chunhe，LI Yinping，QU Dan?an，et al. Advances in researches of the mechanical behaviors of bedded salt rocks[J]. Advances in Mechanics，2008，38(4)：484–494. (in Chinese))
[3] BIENIAWSKI Z T. Time-dependent behavior of fractured rock[J]. Rock Mechanics and Rock Engineering，1970，2(3)：123–137.
[4] PENG S S，PODNIEKS E R. Relaxation and the behavior of failed rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1972，9(6)：699–712.
[5] PENG S S. Time-dependent aspects of rock behavior as measured by a servocontrolled hydraulic testing machine[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1973，10(3)：235–246.
[6] CHO S H，OGATA Y J，KANEKO K. Strain-rate dependency of the dynamic tensile strength of rock[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(5)：763–777.
[7] CHONG K P，HOYT P M，SMITH J W，et al. Effects of strain rate on oil shale fracturing[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1980，17(1)：35–43.
[8] OLSSON W A. The compressive strength of tuff as a function of strain rate from 10－6 to 103 sec[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1991，28(1)：115–118.
[9] MAHMUTOGLU Y. The effects of strain rate and saturation on a micro-cracked marble[J]. Engineering Geology，2006，82(3)：137–144.
[10] 李永盛. 加载速率对红砂岩力学效应的试验研究[J]. 同济大学学报：自然科学版，1995，23(3)：265–269.(LI Yongsheng. Experimental analysis of mechanical effects of loading rates on red sandstone[J]. Journal of Tongji University：Natural Science，1995，23(3)：265–269.(in Chinese))
[11] 陈升强. 刚性加荷技术和加载形式对岩石变形全过程力学性态的影响[J]. 力学与实践，1984，5(4)：42–44.(CHEN Shengqiang. Influence of rigid loading technique and loading form on mechanical property in whole process of rock deformation[J]. Mechanics in Engineering，1984，5(4)：42–44.(in Chinese))
[12] 尹小涛，葛修润，李春光，等. 加载速率对岩石材料力学行为的影响[J]. 岩石力学与工程学报，2010，29(增1)：2 601–2 615.(YIN Xiaotao，GE Xiurun，LI Chunguang，et al. Influences of loading rates on mechanical behaviors of rock materials[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.1)：2 601–2 615.(in Chinese))
[13] 李海波，王建伟，李俊如，等. 单轴压缩情况下软岩的动态力学特性试验研究[J]. 岩土力学，2004，25(1)：1–4.(LI Haibo，WANG Jianwei，LI Junru，et al. Dynamic mechanical properties of soft rock under uniaxial compression[J]. Rock and Soil Mechanics，2004，25(1)：1–4.(in Chinese))
[14] 廖红建，蒲武川，殷建华. 软岩的应变速率效应研究[J]. 岩石力学与工程学报，2005，24(18)：3 218–3 223.(LIAO Hongjian，PU Wuchuan，YIN Jianhua. Study of strain rate effect of soft rock[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(18)：3 218–3 223.
[15] 梁卫国，徐素国，莫 江，等. 盐岩力学特性应变率效应的试验研究[J]. 岩石力学与工程学报，2010，29(1)：43–50.(LIANG Weiguo，XU Suguo，MO Jiang，et al. Test study of strain rate effects on mechanical performances of salt rock[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：43–50.(in Chinese))
[16] 周维垣. 高等岩石力学[M]. 北京：中国水利水电出版社，1990：219.(ZHOU Weiyuan. Advanced rock mechanics[M]. Beijing：China Water Power Press，1990：219.(in Chinese))
[17] GOODMAN R E. Introduction to rock mechanics[M]. 2nd ed. Chichester：John Wiley，1989：562.
[18] 李 刚，陈正汉，谢 云，等. 高应变率条件下三峡工程花岗岩动力特性的试验研究[J]. 岩土力学，2007，28(9)：1 833–1 840.(LI Gang，CHEN Zhenghan，XIE Yun，et al. Test research on dynamic characteristics of Three Gorges granite under high strain rate[J]. Rock and Soil Mechanics，2007，28(9)：1 833–1 840.(in Chinese))
[19] 杨春和，陈 锋，曾义金. 盐岩蠕变损伤关系研究[J]. 岩石力学与工程学报，2002，21(11)：1 602–1 604.(YANG Chunhe，CHEN Feng，ZENG Yijin. Investigation on creep damage constitutive theory of salt rock[J]. Chinese Journal of Rock Mechanics and Engineering，2002，21(11)：1 602–1 604.(in Chinese))
[20] 李银平，刘 江，杨春和. 泥岩夹层对盐岩变形和破损特征的影响分析[J]. 岩石力学与工程学报，2006，25(12)：2 461–2 466.(LI Yinping，LIU Jiang，YANG Chunhe. Influence of mudstone interlayer on deformation and failure characteristics of salt rock[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 461–2 466.(in Chinese))
[21] HUDSON J A，HARRISON J P. Engineering rock mechanics：an introduction to the principles[M]. London：Elsevier Science Ltd.，2000：67.
[22] 陈卫忠，伍国军，戴永浩，等. 废弃盐穴地下储气库稳定性研究[J]. 岩石力学与工程学报，2006，25(4)：848–854.(CHEN Weizhong，WU Guojun，DAI Yonghao，et al. Stability analysis of abandoned salt caverns used for underground gas storage[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(4)：848–854.(in Chinese)) |
|
|
|
2011, Vol. 30 
