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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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

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0519 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/I10/2091

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