Experimental study on dynamic mechanical properties of post -high -temperature sandstone
-
摘要: 运用RX3 -20 -12型箱式电阻炉将砂岩试样分别加热至100、200、400、600、800和1 000℃，然后自然冷却至常温，制成经历不同温度的砂岩试件。运用直径为100mm的分离式Hopkinson压杆装置，用薄圆形紫铜片作为波形整形器，以不同弹速轴向冲击砂岩试样，测试经历不同温度后砂岩试样在不同冲击荷载下的动态力学性能，得出了砂岩的应力-应变曲线及各自的破坏形态。结果表明：常温下砂岩的动态压缩破坏的应力-应变曲线具有明显的4阶段特征，但经历100~400℃作用的砂岩应力-应变曲线的平台段消失，温度继续升高时平台段又重新出现；砂岩的峰值应变随温度升高而升高，动态压缩强度也随温度升高而升高，但在800℃以后陡然下降；砂岩的动态压缩破坏形态受温度和冲击荷载的共同影响，冲击荷载越大破碎程度越大，而且破坏过程总是由外层向内芯发展。Abstract: The sandstone samples were heated at the rising temperature rate of 10℃/min from 25℃ to 100, 200, 400, 600, 800 and 1 000℃, respectively, by using a RX3-20-12box-type resistance furnace.They were being kept at the corresponding temperatures for 3h.Then the heated sandstone samples were naturally cooled to 25℃.All the sandstone samples were divided into seven groups according to the temperatures undergone by them.By using a thin red copper circular plate as the pulse shaper, the sandstone samples were impacted by the different-velocity projectiles driven by a 100-mmdiameter split Hopkinson pressure bar setup.And the stress-strain curves of the sandstone samples subjected to impact were obtained as well as their failure modes.Experimental results show that the stress-strain curves of the sandstone samples at constant temperature obviously take on four stages, but the platform stages disappear in the stress-strain curves of the sandstone samples undergoing 100-400℃ and they appear again when the temperatures undergone by the sandstone samples continue to rise.As the temperatures undergone by the sandstone samples rise, their peak strains and stresses increase; but when the temperatures undergone exceed 800℃, the peak stresses fall suddenly.The impact load and the heat temperature can affect the failure mode of sandstone, the break degree increases with the increasing of the impact load and the damage develops from the outer of sandstone to the core.
-
Key words:
- solid mechanics /
- stress -strain curve /
- SHPB /
- sandstone /
- failure mode /
- post -high temperature
-
[1] 孙光忠, 孙毅.岩体力学原理[M].北京: 科学出版社, 2011. [2] 何国梁, 吴刚, 黄醒春, 等.砂岩高温前后超声特性的试验研究[J].岩土力学, 2007, 28(4): 779-784. doi: 10.3969/j.issn.1000-7598.2007.04.028He Guo-liang, Wu Gang, Huang Xing-chun, et al. Experimental study on ultrasonic properties of sandstone before and after high temperature[J]. Rock and Soil Mechanics, 2007, 28(4): 779-784. doi: 10.3969/j.issn.1000-7598.2007.04.028 [3] 邱一平, 林卓英.花岗岩样品高温后损伤的试验研究[J].岩土力学, 2006, 27(6): 1005-1010. doi: 10.3969/j.issn.1000-7598.2006.06.032Qiu Yi-ping, Lin Zhuo-ying. Testing study on damage of granite samples after high temperature[J]. Rock and Soil Mechanics, 2006, 27(6): 1005-1010. doi: 10.3969/j.issn.1000-7598.2006.06.032 [4] 杜守继, 马明, 陈浩华, 等.花岗岩经历不同高温后纵波波速分析[J].岩石力学与工程学报, 2003, 22(11): 1803-1806. doi: 10.3321/j.issn:1000-6915.2003.11.010Du Shou-ji, Ma Ming, Chen Hao-hua, et al. Testing study on longitudinal wave characteristics of granite after high temperature[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(11): 1803-1806. doi: 10.3321/j.issn:1000-6915.2003.11.010 [5] 杜守继, 刘华, 职洪涛, 等.高温后花岗岩力学性能的试验研究[J].岩石力学与工程学报, 2004, 23(14): 2359-2364. doi: 10.3321/j.issn:1000-6915.2004.14.010Du Shou-ji, Liu Hua, Zhi Hong-tao, et al. Testing study on mechanical properties of post-high-temperature granite[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(14): 2359-2364. doi: 10.3321/j.issn:1000-6915.2004.14.010 [6] 支乐鹏, 许金余, 刘军忠, 等.花岗岩高温后的超声特性及力学性能研究[J].地下空间与工程学报, 2012, 8(4): 716-721.Zhi Le-peng, Xu Jin-yu, Liu Jun-zhong, et al. Research on ultrasonic characteristics and mechanical properties of granite under post-high temperature[J]. Chinese Journal of Underground Space Engineering, 2012, 8(4): 716-721. [7] 朱合华, 闫治国, 邓涛, 等. 3种岩石高温后的力学性质的试验研究[J].岩石力学与工程学报, 2006, 25(10): 1945-1950. doi: 10.3321/j.issn:1000-6915.2006.10.001Zhu He-hua, Yan Zhi-guo, Deng Tao, et al. Testing study on mechanical properties of tuff, granite and breccia after high temperatures[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(10): 1945-1950. doi: 10.3321/j.issn:1000-6915.2006.10.001 [8] 许金余, 吕晓聪, 张军, 等.围压条件下岩石循环冲击损伤的能量特性研究[J].岩石力学与工程学报, 2010, 29(2): 4159-4165.Xu Jin-yu, LüXiao-cong, Zhang Jun, et al. Research on energy properties of rock cyclical impact damage under confining pressure[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(2): 4159-4165. [9] 单仁亮, 陈石林, 李宝强.花岗岩单轴冲击全程本构特性的试验研究[J].爆炸与冲击, 2000, 20(1): 32-37. doi: 10.3321/j.issn:1001-1455.2000.01.006Shan Ren-liang, Chen Shi-lin, Li Bao-qiang. Experimental study of granite constitutive properties under uniaxial impact[J]. Explosion and Shock Waves, 2000, 20(1): 32-37. doi: 10.3321/j.issn:1001-1455.2000.01.006 [10] 许金余, 吕晓聪, 张军, 等.循环冲击作用下围压对斜长角闪岩动态特性的影响研究[J].振动与冲击, 2010, 29(8): 60-63;72. doi: 10.3969/j.issn.1000-3835.2010.08.015Xu Jin-yu, LüXiao-cong, Zhang Jun, et al. Fast algorithm for calculation of structural dynamic response in frequency domain under one-dimensional distributed random load[J]. Journal of Vibration and Shock, 2010, 29(8): 60-63;72. doi: 10.3969/j.issn.1000-3835.2010.08.015 [11] 刘石, 许金余, 刘军忠, 等.绢云母石英片岩和砂岩的SHPB试验研究[J].岩石力学与工程学报, 2011, 30(9): 1864-1871.Liu Shi, Xu Jin-yu, Liu Jun-zhong, et al. SHPB experimental study of sericite-quartz schist and sandstone[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(9): 1864-1871. [12] 陶俊林. SHPB实验技术若干问题研究[D].四川: 中国工程物理研究所, 2005. [13] 李为民, 许金余, 沈刘军, 等. Ø100mm SHPB应力均匀及恒应变率加载试验技术研究[J].振动与冲击, 2008, 27(2): 129-132. doi: 10.3969/j.issn.1000-3835.2008.02.030Li Wei-min, Xu Jin-yu, Shen Liu-jun, et al. Study on 100-mm-diameter SHPB techniques of dynamic stress equilibrium and nearly constant strain rate loading[J]. Journal of Vibration and Shock, 2008, 27(2): 129-132. doi: 10.3969/j.issn.1000-3835.2008.02.030 [14] 陶俊林, 陈裕泽, 田常津, 等. SHPB系统圆柱形试件的惯性效应分析[J].固体力学学报, 2005, 26(1): 107-110. doi: 10.3969/j.issn.0254-7805.2005.01.019Tao Jun-lin, Chen Yu-ze, Tian Chang-jin, et al. Analysis of the inertial effect of the cylindrical specimen in SHPB system[J]. Acta Mechanica Solid Sinica, 2005, 26(1): 107-110. doi: 10.3969/j.issn.0254-7805.2005.01.019 [15] Davies E D H, Hunter S C. The dynamic compression testing of solids by the method of the split Hopkinson pressure bar[J]. Journal of Mechanics and Physics of Solids, 1963, 11(3): 155-179. doi: 10.1016/0022-5096(63)90050-4 [16] 王礼立.应力波基础[M].北京: 国防工业出版社, 2005. [17] Frew D J, Forrestal M J, Chen W. Pulse shaping techniques for testing brittle materials with a split Hopkinson pressure bar[J]. Experimental Mechanics, 2002, 42: 93-106. doi: 10.1007/BF02411056 [18] Chen W, Lu F, Frew D J. Dynamic compression testing of soft materials[J]. Journal of Applied Mechanics, 2002, 69(3): 214-223. doi: 10.1115/1.1464871 -
下载:
图(4)
计量
- 文章访问数: 3273
- HTML全文浏览量: 416
- PDF下载量: 443
- 被引次数: 0