(1. School of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；2. Beijing MTR Construction Administration Corporation，Beijing，100037；3. Beijing Rail and Transit Design and Research Institute Corporation，Beijing，100089)
Abstract：For searching the impact of loading frequency on the fatigue life and deformation characteristics of rock，low cyclic fatigue tests of limestone were conducted under 0.5，1.0，1.5，2.0，2.5 and 3.0 Hz loading frequencies by using a MTS 810 dynamic test system. The results indicate that there are well linear relationship between fatigue life and loading frequency in double logarithmic coordinate and fatigue life increases with the raises of frequency. It is mainly due to the strong sensitivity of limestone for loading rate and uniaxial compress strength of limestone increasing with the improvement of loading rate. The axial deformation of limestone goes through three-stage evolution. The cumulative amount of deformation in the second and third evolution stages is almost independent of loading frequency. In the range of loading frequencies，the ultimate deformation of limestone samples in fatigue tests is controlled by uniaxial compressive stress-strain curve，the calculated relative error is nothing to do with loading frequency. The tests results under different frequencies indicate that ultimate deformation law of rock fatigue failure which is hardly impacted by load frequency is a universal law. The average strain increment of each cycle in the second evolution stage reduces with the increase of loading frequency. Combined with the law of limestone deformation evolution，a strain-increment-based fatigue life calculated model was proposed. The evaluation results of this model are more conservation than measured ones，and its parameters are easy to obtain.
GRAF O，BRENNERE. Experiments for investigating the resistance of concrete under often repeated compression loads.1[J]. Bulletin Deutscher Ausschuss fur Stahlbeton Berlin，1934，(76)：17-25.
[2]
BAGDE M N，PETROS V.Waveform effect on fatigue properties of intact sandstone in uniaxial cyclical loading[J]. Rock Mechanicsand Rock Engineering，2005，38(3)：169-196.
[3]
LI N，CHEN W，ZHANG P，et al. The mechanical propertiesand a fatigue-damage model for jointed rock masses subjected todynamic cyclical loading[J]. InternationalJournal ofRock Mechanics andMining Sciences，2001，38(7)：1071-1 079.
[4]
蒋 宇. 周期载荷作用下岩石疲劳破坏及变形发展规律[硕士学位论文][D]. 上海：上海交通大学，2003.(JIANG Yu. Fatigue failure and deformation development law of rock under cyclic load[M. S. Thesis][D]. Shanghai：Shanghai JiantongUniversity，2003.(in Chinese))
[5]
肖建清.循环荷载作用下岩石疲劳特性的理论与实验研究[博士学位论文][D]. 长沙：中南大学，2009.(XIAO Jianqing. Theoretical and experimental study of rock fatigue characteristics under cyclic loading [Ph. D. Thesis][D]. Changsha：Central SouthUniversity，2009.(in Chinese))
[6]
RAY SK，SARKAR M，SINGH TN. Effect of cyclic loading and strain rate on themechanicalbehaviour of sandstone[J].InternationalJournal ofRock Mechanics andMining Sciences，1999，36：543-549.
[7]
ATTEWELL P B，FARMERI W. Fatigue behaviour of rock[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1973，10(1)：1-9.
[8]
ISHIZUKA Y，ABE T. Fatigue behaviour of granite under cyclic loading[C]// Static and Dynamic Considerations in Rock Engineering. Rotterdam：A. A. Balkema，1990：139-147.
[9]
朱劲松，宋玉普. 定侧压混凝土双轴等幅拉压疲劳性能试验研究[J]. 建筑结构学报，2006，27(6)：123-128.(ZHUJinsong，SONGYupu. Experimental study offatigue behavior of concrete under constant- amplitudebiaxial cyclic tension-compression with constant confinement[J]. Journalof Building Structures，2006，27(6)：123-128.(in Chinese))
[10]
宋玉普，赵东拂. 混凝土强度与疲劳寿命试验样本容量分析[J]. 大连理工大学学报，2002，42(4)：464-466.(SONG Yupu，ZHAO Dongfu. Sample size analyses for tests of concrete strength and fatigue life[J]. Journal of Dalian University of Technology，2002，42(4)：464-466.(inChinese))
[11]
杨仕教，曾晟，王和龙. 加载速率对石灰岩力学效应的试验研究[J].岩土工程学报，2005，27(7)：786-788.(YANG Shijiao，ZENGSheng，WANG Helong. Experimental research on mechanical effects of loading rates on limestone[J]. Chinese Journal of Geotechnical Engineering，2005，27(7)：786-788.(in Chinese))
[12]
葛修润，蒋宇，卢允德，等. 周期荷载作用下岩石疲劳变形特性试验研究[J]. 岩石力学与工程学报，2003，22(10)：1 581-1 585.(GEXiurun，JIANG Yu，LU Yunde，et al. Testing study on fatiguedeformation law of rock under cyclic loading[J]. Chinese Journal ofRock Mechanics and Engineering，2003，22(10)：1 581-1 585.(inChinese))
[13]
蒋宇，葛修润，任建喜. 岩石疲劳破坏过程中的变形规律及声发射特性[J]. 岩石力学与工程学报，2004，23(11)：1 810-1 814.(JIANGYu，GE Xiurun，REN Jianxi. Deformation rules and acoustic emission characteristics of rocks in process of fatigue failure[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(11)：1 810-1 814.(in Chinese))
[14]
李树春.周期荷载作用下岩石变形与损伤规律及其非线性特征[博士学位论文][D]. 重庆：重庆大学，2008.(LI Shuchun. Deformation and damage law and its nonlinear characteristics of rock under cyclic load[Ph. D. Thesis][D]. Chongqing：ChongqingUniversity，2008.(inChinese))
[15]
王鸿，许江，李树春，等. 不同水饱和度下岩石滞回曲线演化的试验研究[J]. 矿业研究与开发，2007，29(4)：80-82.(WANGHong，XU Jiang，LI Shuchun，et al. Experimental research on theevolution ofhysteresis curve of fine-sandstone with different watersaturations[J].Mining Research and Development，2007，29(4)：80-82.(in Chinese))
[16]
王瑞敏，赵国藩，宋玉普. 混凝土的受压疲劳性能研究[J]. 土木工程学报，1991，24(4)：38-47.(WANGRuimin，ZHAOGuofan，SONGYupu. Compressivefatigue characteristics ofconcrete[J]. China Civil EngineeringJournal，1991，24(4)：38-47.(in Chinese))
[17]
欧进萍，林燕清. 混凝土高周疲劳损伤的性能劣化试验研究[J]. 土木工程学报，1999，32(5)：15-22.(OUJinping，LINYanqing. Experimental study ofperformance degradation of plain concrete due tohigh-cycle fatigue damage[J]. China Civil EngineeringJournal，1999，32(5)：15-22.(in Chinese))
[18]
李朝阳，宋玉普，赵国藩. 混凝土疲劳残余应变性能研究[J]. 大连理工大学学报，2001，41(3)：355-358.(LIChaoyang，SONGYupu，ZHAOGuofan. Study of residualstrain of concrete under fatigue loading[J]. Journal ofDalian University of Technology，2001，41(3)：355-358.(in Chinese))
2014, Vol. 33 
