The stress wave amplitude value and the space-time evolution law of energy dissipation significantly impact the rock-breaking effect, which is often neglected in preventing and controlling rock burst and coal and rock dynamic disasters. To study the impact of the shape of shock pulse on the dynamic characteristics of rocks, a split Hopkinson bar experimental system (SHPB) was used to conduct dynamic compression tests on dry and saturated red sandstone at different strain rates(128.88 s-1~711.31 s-1) using a variety of length (200, 300, 400, 500 mm) and spindle-shaped impact bars (bullets). Based on the test results, it is found that the duration of the stress wave has a significant impact on the strain rate and dynamic strength of the rock. When the length of the impact bar is greater than 300 mm, the strain rate-time history curve has a "double peak" phenomenon, and the dynamic strength of the rock has a linear relationship with the duration. When ε· < 300 s-1, the transmission energy increases with the increase of strain rate . When ε· > 300 s-1 and the length of the impact rod is greater than 300 mm, the transmissivity of the rock decreases with the increase of the strain rate, while the dissipated energy increases with the increase of the strain rate.
[1] 国家统计局.中华人民共和国2021年国民经济和社会发展统计公报[J].中国统计,2022 (3):9-26.
[2] 王恩元,张国锐,张超林,等.我国煤与瓦斯突出防治理论技术研究进展与展望[J].煤炭学报,2022,47(1):297-322.
[3] 范立民,迟宝锁,王宏科,等.鄂尔多斯盆地北部直罗组含水层研究进展与水害防治建议[J].煤炭学报,2022,47(10):3535-3546.
[4] 董书宁,姬亚东,王皓,等.鄂尔多斯盆地侏罗纪煤田典型顶板水害防控技术与应用[J].煤炭学报,2020,45(7):2367-2375.
[5] 智国军,鞠金峰,刘润,等.水岩相互作用对煤矿地下水库水质影响机理研究[J].采矿与安全工程学报,2022,39(4):779-785.
[6] 窦林名,田鑫元,曹安业,等.我国煤矿冲击地压防治现状与难题[J].煤炭学报,2022,47(1):152-171.
[7] 康红普.我国煤矿巷道围岩控制技术发展70年及展望[J].岩石力学与工程学报,2021,40(1):1-30.
[8] 宫凤强,赵英杰,王云亮,等.煤的冲击倾向性研究进展及冲击地压“人-煤-环”三要素机理[J].煤炭学报,2022,47(5):1974-2010.
[9] 钱鸣高,石平五,许家林.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2010.
[10] 姜耀东,潘一山,姜福兴,等.我国煤炭开采中的冲击地压机理和防治[J].煤炭学报,2014,39(2):205-213.
[11] 赵毅鑫,姜耀东,田素鹏.冲击地压形成过程中能量耗散特征研究[J].煤炭学报,2010,35(12):1979-1983.
[12] 王光勇,余锐,马东方,等.饱水细砂岩动态抗拉与抗压强度试验对比研究[J].高压物理学报,2020,34(4):49-58.
[13] 王斌,李夕兵,尹土兵,等.饱水砂岩动态强度的SHPB试验研究[J].岩石力学与工程学报,2010,29(5):1003-1009.
[14] 孟召平,彭苏萍,傅继彤.含煤岩系岩石力学性质控制因素探讨[J].岩石力学与工程学报,2002(1):102-106.
[15] 李业学,张启明,周炜,等.干燥和饱水砂岩孔隙度对应力波能耗的影响[J].实验力学,2020,35(1):174-182.
[16] 李宇白,翟越,李艳,等.冻融循环后砂岩抗冲击力学特性及数值模拟[J].地下空间与工程学报,2022,18(5):1580-1587.
[17] 解北京,栾铮,刘天乐,等.静水压下原生组合煤岩动力学破坏特征[J].煤炭学报,2023,48(5):2153-2167.
[18] 曹海,马芹永.玄武岩纤维水泥土的冲击劈裂性能试验研究[J].地下空间与工程学报,2022,18(1):147-153.
[19] 王浩宇,许金余,王鹏,等.含水岩石动态抗压强度与微观机制[J].空军工程大学学报(自然科学版),2016,17(4):107-111.
[20] 王浩宇,许金余,王鹏,等.水-动力耦合作用下红砂岩力学性质及能量机制研究[J].岩土力学,2016,37(10):2861-2868,2876.
[21] 郑广辉,许金余,王鹏,等.不同饱水度红砂岩静态本构关系及动态力学性能研究[J].振动与冲击,2018,37(16):31-37.
[22] 张慧梅,程树范,张嘉凡,等.基于水-岩共同受荷机理的饱和岩石粘弹性损伤模型[J].武汉理工大学学报,2019,41(9):78-83.
[23] 金解放,徐虹,余雄,等.动荷载和含水率对红砂岩破坏及能耗特性的影响[J].岩土力学,2022(12):1-10.
[24] 中国岩石力学与工程学会.岩石动力特性试验规程(T/CSRME001-2019)[S].北京:中国标准出版社,2019.
[25] 解北京,石嘉煜.不同子弹构型霍普金森杆入射波数值模拟分析[J].工程爆破,2023,29(4):1-9.
[26] Chen W, Lu F, Frew D J, et al. Dynamic compression testing of soft materials[J]. Journal of Applied Mechanics, 2002, 69(3):214-223.
[27] Frew D J, Forrestal M J, Chen W. Pulse shaping techniques for testing brittle materials with a split Hopkinson pressure bar. Experimental Mechanics[J]. 2002, 42(1): 93-106.
[28] 潘博,汪旭光,郭连军,等.组合静载条件下SHPB试件长径比优选研究[J].爆破,2022,39(3):1-9.
[29] 解北京,栾铮,陈冬新,等.不同长径比煤样动力学特征及本构模型[J].矿业科学学报,2023,8(2):190-201.
[30] 洪亮. 冲击荷载下岩石强度及破碎能耗特征的尺寸效应研究[D].长沙:中南大学,2008.
[31] Zhang Z X, Ko S Q, Jiang L G, et al. Effects of loadingrate on rock fracture: fracture characteristics and energy partitioning [J]. International Journal of Rock Mechanics and Mining Sciences, 2000,37(5):745-762.
