冲击载荷作用下层状砂岩动态拉压力学特性研究

doi:10.13722/j.cnki.jrme.2015.0519

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摘要为研究层理面倾角对层状岩体动态拉压力学特性的影响，加工制备含5组不同层理面倾角的层状砂岩试样，在50 mm杆径分离式霍普金森压杆(SHPB)试验平台上进行冲击压缩和冲击劈裂拉伸试验，利用高速摄像仪实时记录试样动态裂纹扩展及破坏过程，分析层理面倾角或对层状砂岩动态应力–应变、动态抗压和抗拉强度、破坏模式及能量吸收特性的影响规律。该层状砂岩层理面之间的差异主要来源于层间矿物组成成分含量的不同。研究表明：(1) 冲击压缩载荷作用下，层状砂岩主要表现为5种典型破坏模式，随倾角增大，层状砂岩动态抗压强度呈倒U型变化；(2) 冲击拉伸载荷作用下，巴西劈裂试样均表现为沿加载方向的劈裂拉伸破坏，随倾角增大，层状砂岩动态抗拉强度增大。层状砂岩的能量吸收率随层理面倾角的不同而不同，选择与层理面合适的加载角(如 = 90°或 = 0°)，可以有效提高岩石破岩的能量利用率。

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关键词 ：岩石力学, 层状砂岩, 动态强度, 层理面, 能量吸收率

Abstract：In order to study the influence of the dip angle of bedding planes on the dynamic properties of bedding rocks，dynamic compressive and dynamic splitting tensile tests were carried out with 50 mm split Hopkinson pressure bars(SHPB) system on the bedding sandstone specimens with five different dip angles. The dynamic strain signals in incident bar and transmitted bar were monitored with the ultra-dynamic strain indicator. The process of dynamic crack development and the failure process of the sandstone specimens were recorded by a high speed camera. The effects of the dip angle( or )of bedding planes on the dynamic properties of bedding sandstones，including the relationships of the dynamic stresses and strains，the dynamic compressive and tensile strengths，the failure patterns and energy absorption properties were analyzed. The differences of interlayer were mainly the different contents of mineral compositions. It was found that the bedding sandstone specimens under the impact compressive loading generated five kinds of failure patterns with change of dip angles. With the increase of dip angle ，the dynamic compressive strength of bedding sandstone showed an inverted U-shaped tendency. Under the impact tensile loading，the splitting failure along the diametric loading direction occurred for all the Brazilian specimens. The dynamic tensile strength of bedding sandstone increased when the dip angle increased. The energy absorption ratio changed as the dip angle varied. With the proper loading angles(such as = 90° or = 0°)，the maximum energy absorption ratio was reached.

Key words： rock mechanics bedding sandstone dynamic strength bedding plane energy absorption ratio

引用本文:

李地元，邱加冬，李夕兵. 冲击载荷作用下层状砂岩动态拉压力学特性研究[J]. 岩石力学与工程学报, 2015, 34(10): 2091-2097.
LI Diyuan，QIU Jiadong，LI Xibing. EXPERIMENTAL STUDY ON DYNAMIC TENSILE AND COMPRESSIVE PROPERTIES OF BEDDING SANDSTONE UNDER IMPACT LOADING. , 2015, 34(10): 2091-2097.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.0519 或 http://www.rockmech.org/CN/Y2015/V34/I10/2091

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