端部摩擦作用对砂岩尺寸效应影响的试验
Experiment on Influence of End Friction on Size Effect of Sandstone
-
摘要: 为研究端部摩擦作用对砂岩材料尺寸效应的影响，提出了1种采用岩石垫块消除端部摩擦作用的试验方法，对不同高径比的砂岩试样进行了单轴压缩试验，并与传统试验方法进行对比分析。结果表明：采用岩石垫块的方法对端部摩擦具有很好的抑制作用；受端部摩擦作用环向约束的影响，采用传统试验方法加载时，试样的破坏形态随长径比的增大经历劈裂破坏-拉剪混合破坏-剪切破坏的演变过程，消除端部摩擦后试样的破坏形态均为剪切破坏；在端部摩擦作用下，岩石的峰值强度测试值大于其真实强度，试样的测试值是由真实强度和端部摩擦贡献值2部分组成，端部摩擦贡献值随试样尺寸的增大总体逐渐减小。Abstract: To investigate the influence of the end friction on the size effect of sandstone, a new test method was proposed to reduce the end friction. Uniaxial compression tests were carried out on sandstone samples with different height-diameter ratios. The results show that: the proposed test method in this paper has good inhibiting effect on the end friction. Due to the hoop constraint of end friction, the damage mode of samples experience the evolution from splitting failure to tension-shear hybrid failure and shear failure with the increase of the height-diameter ratio in the traditional uniaxial compression, while the failure patterns are always shear failure when the end friction has been eliminated. Under the influence of end friction, the experimental uniaxial compressive strength is greater than its true strength. The test strength comprises the true strength and the contribution value of end friction, and the contribution value decreases gradually with the increase of the height-diameter ratio.
-
Keywords:
- rock material /
- size effect /
- end friction /
- impact factor /
- height-diameter ratio /
- rock mechanics
-
-
[1] 任利,谢和平,谢凌志,等.基于断裂力学的裂隙岩体强度分析初探[J].工程力学,2013,30(2):156-162. [2] Hudson J A, Crouch S L, Fairhust C, et al. Soft, stiff and servo-controlled testing machines[J]. Eng. Geol., 1972, 6(3): 155-189. [3] Qi Chengzhi, Wang Mingyang, Bai Jiping, et al. Mechanism underlying dynamic size effect on rock mass strength[J]. International Journal of Impact Engineering, 2014, 68(3): 1-7. [4] 梁正召,张永彬,唐世斌,等.岩体尺寸效应及其特征参数计算[J].岩石力学与工程学报,2013,32(6):1157-1166. [5] Li Ming, Mao Xianbiao, Lu Aihong, et al. Effect of specimen size on energy dissipation characteristics of red sandstone under high strain rate[J]. International Journal of Mining Science and Technology, 2014, 24(2):151-156. [6] S K Kourkoulis, E Ganniari-Papageorgiou. Experimental study of the size-and shape-effects of natural building stones[J]. Construction and Building Materials, Construction and Building Materials, 2010, 24(5): 803. [7] 宋良,刘卫群,靳翠军.考虑端面摩擦效应的煤样统计损伤尺度本构模型[J].工程力学,2012,29(11):344. [8] 邵冬亮,李术才,李明田,等.单轴压缩条件下不同裂纹制作方式的裂纹破坏分析及其声发射特征研究[J].山东大学学报(工学版),2011,41(3):131-136. [9] P Bésuelle, J Desrues, S Raynaud. Experimental characterisation of the localisation phenomenon inside a Vosges sandstone in a triaxial cell[J]. International Journal of Rock Mechanics and Mining Sciences, 2000, 37(8): 1223-1237. [10] 尤明庆,苏承东.大理岩试样的长度对单轴压缩试验的影响[J].岩石力学与工程学报,2004,23(22): 3754-3760. [11] 尤明庆,苏承东.平台巴西圆盘劈裂和岩石抗拉强度的试验研究[J].岩石力学与工程学报,2004,23(18):3106-3122. [12] 王朝成.混凝土材料性能测试的三段压理论与试验的研究[D].淮南:安徽理工大学,2007. [13] 张明,卢裕杰,介玉新,等.不同加载条件下岩石强度尺寸效应的数值模拟[J].水力发电学报,2011,30(4): 147-154. [14] 谢和平,高峰,周宏伟,等.岩石断裂和破碎的分形研究[J].防灾减灾工程学报,2003,23(4):1-9. [15] 高峰,谢和平,赵鹏.岩石块度分布的分形性质及细观结构效应[J].岩石力学与工程学报,1994,13(3):240-246. [16] 刘宝琛,张家生,杜奇中,等.岩石抗压强度的尺寸效应[J].岩石力学与工程学报,1998,17(6):611-614. [17] 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. [18] 杨圣奇,苏承东,徐卫亚.岩石材料尺寸效应的试验和理论研究[J].工程力学,2005,22(4):112-118. -
期刊类型引用(2)
1. 王彤标，赵九利，徐维骏，蔡龙春，王毓伦，高明专，王刘文. 基于沉积相的贵州煤矿水患分区与防治. 贵州地质. 2024(03): 318-327+277 . 
百度学术
2. 张国昌. 如何有效加强煤矿防治水工作. 矿业装备. 2022(05): 150-151 . 百度学术
其他类型引用(0)
计量
- 文章访问数: 159
- HTML全文浏览量: 0
- PDF下载量: 0
- 被引次数: 2
下载:
