主动围压下地下工程岩石的冲击压缩特性试验研究

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (0 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要岩石等脆性材料的力学性能与其所受围压的大小密切相关。为了研究地下工程岩石在围压下的冲击压缩特性，采用具主动围压加载的分离式Hopkinson压杆，对岩石进行主动围压下的SHPB冲击压缩试验，得到岩石在不同围压和不同应变率下的轴向应力–应变曲线，并对试验过程中试件的应力均匀性进行分析。研究表明：岩石类脆性材料在围压作用下其抗压强度和韧性大大提高，并且具有向延性特征发展的趋势，显现出较强的围压效应；在同等级围压下，岩石的峰值强度和峰值应变随应变率的变化表现出显著的应变率相关性，动态强度增长因子与应变率的对数呈近似线性关系，动态强度随应变率的增加而近似线性增长。单轴动荷载下，岩石在以拉应力为主，其他应力联合作用下发生破坏，表现出明显的脆性特征；随着围压的增加，岩石试件将发生脆性向延性的转变，破坏形态以压剪破坏为主，同时发生拉应变破坏和卸载破坏。

	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, 冲击力学性能, 霍普金森压杆, 斜长角闪岩, 主动围压, 应变率

Abstract：The mechanical properties of rock-like brittle materials are closely related to the confining pressure. In order to study the dynamic mechanical properties of rock under confining pressure and get its axial stress-strain curve under distinct confining pressures and strain rates，the underground engineering rock are subjected to impact compression experiments with the split Hopkinson pressure bar(SHPB) of diameter 100 mm with active confining pressure device. At the same time，the dynamic stress equilibrium of SHPB experiment is analyzed. Experimental results show that：(1) The dynamic compressive strength and toughening effects of rock are more prominent under confining pressure and appears development trends to ductile characteristic，which reveals a strong confining pressure effect. (2) Under the same range of confining pressure，rock?s peak strength and peak strain change with the strain rate and reveal significant strain rate dependence. The dynamic strength increase factor keeps an approximately linear relationship with the logarithm of strain rate and dynamic strength appears approximately linearly increase with the stain-rate upwards. (3) The rock demonstrates the obvious fragility characteristic under axial dynamic load. It damages under the action of many stresses combined and mainly by the tensile stress. With the confining pressure increasing，the rock sample reverses from brittle to ductile. Failure modes are characterized by compression shear damage going with tensile strain damage and unloading damage.

Key words： rock mechanics impact mechanical properties Hopkinson pressure bar amphibolites active confining pressure strain rate

收稿日期: 2011-05-20

引用本文:

刘军忠1，许金余1，2，赵德辉1，白二雷1，王振宇3. 主动围压下地下工程岩石的冲击压缩特性试验研究[J]. 岩石力学与工程学报, 2011, 30(S2): 4104-4109.
LIU Junzhong1，XU Jinyu1，2，ZHAO Dehui1，BAI Erlei1，WANG Zhenyu3. EXPERIMENTAL STUDY OF SHOCK COMPRESSION PROPERTIES OF UNDERGROUND ENGINEERING ROCK UNDER ACTIVE CONFINING PRESSURE. , 2011, 30(S2): 4104-4109.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/4104

[2]	蔡美峰，何满潮，刘东燕. 岩石力学与工程[M]. 北京：科学出版社，2002：129-131.(CAI Meifeng，HE Manchao，LIU Dongyan. Rock mechanics and engineering[M]. Beijing：Science Press，2002：129-131.(in Chinese)) " target="_blank">
[3]	李夕兵，周子龙，叶州元，等. 岩石动静组合加载力学特性研究[J]. 岩石力学与工程学报，2008，27(7)：1 387-1 395.(LI Xibing，ZHOU Zilong，YE Zhouyuan，et al. Study of rock mechanical characteristics under coupled static and dynamic loads[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(7)：1 387-1 395.(in Chinese)) " target="_blank">
[5]	RAVICHANDRAN G，SUBHASH G. Critical appraisal of limiting strain rates for compression testing of ceramics in a split Hopkinson pressure bar[J]. Journal of the American Ceramic Society，1994，77(1)：263-267. " target="_blank">
[6]	刘军忠，许金余，吕晓聪，等. 大直径分离式Hopkinson压杆主动围压加载试验技术[C]// 第十一次全国岩石力学与工程学术大会论文集. [S.l.]：[s.n.]，2010：161-166.(LIU Junzhong，XU Jinyu，LU Xiaocong，et al. Large diameter SHPB with confining pressure loads testing techniques[C]// Proceedings of the 11th National Congress on Rock Mechanics and Engineering. [S.l.]：[s.n.]，2010：161-166.(in Chinese)) " target="_blank">
[8]	高富强，杨军，甯尤军. 围压对脆性材料力学性能影响的研究现状[J]. 有色金属，2009，61(2)：46-49.(GAO Fuqiang，Yangjun，NING Youjun. Research status in the effect of confining pressure on brittle material mechanics[J]. Nonferrous Metals，2009，61(2)：46-49.(in Chinese)) " target="_blank">
[10]	东兆星，单仁亮. 岩石在动载作用下破坏模式与强度特性研究[J]. 爆炸器材，2000，29(1)：1-5.(DONG Zhaoxing，SHAN Renliang. Research on the failure pattern and strength properties of rock under dynamic loading[J]. Explosive Materials，2000，29(1)：1-5.(in Chinese)) " target="_blank">
[1]	李夕兵，陈寿如，古德生. 岩石在不同加载波下的动载强度[J]. 中南矿冶学院学报，1994，25(3)：301-304.(LI Xibing，CHEN Shouru，GU Desheng. Dynamic strength of rock under impulse loads with different stress waveforms and durations[J]. Journal of Central South Institute of Mining and Metallurgy，1994，25(3)：301-304.(in Chinese)) " target="_blank">
[4]	巫绪涛，杨伯源，李和平，等. 大直径SHPB装置的数值模拟及试验误差分析[J]. 应用力学学报，2006，23(3)：431-434.(WU Xutao，YANG Boyuan，LI Heping，et al. Numerical simulation and error analysis of large diameter SHPB[J]. Chinese Journal of Applied Mechanics，2006，23(3)：431-434.(in Chinese)) " target="_blank">
[7]	李为民，许金余. 大直径分离式霍普金森压杆试验中的波形整形技术研究[J]. 兵工学报，2009，30(3)：350-355.(LI Weimin，XU Jinyu. Pulse shaping techniques for large-diameter split Hopkinson pressure bar test[J]. Acta Armamentarii，2009，30(3)：350-355.(in Chinese))
[9]	刘军忠，许金余，吕晓聪，等. 冲击压缩荷载下角闪岩的动态力学性能试验研究[J]. 岩石力学与工程学报，2009，28(10)：2 113-2 120. (LIU Junzhong，XU Jinyu，LU Xiaocong，et al. Experimental study on dynamic mechanical properties of amphibolites under impact compressive loading[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(10)：2 113-2 120.(in Chinese)) " target="_blank">