循环冲击作用下风化红砂岩动态响应特性

doi:10.13722/j.cnki.jrme.2018.1448

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Abstract In view of the dynamic response characteristics of weathered red sandstone under cyclic impact，cyclic impact tests under different axial pressures and different impact loads were performed by dynamic-static coupling loading device. The effects of axial pressures and impact loads on mechanical properties and energy dissipation is analyzed. The following conclusions are drawn from the results：The peak of transmitted wave increases with the increase of the number of cyclic shocks with the same incident wave，and there is a peak point in transmission wave peak. The reflected wave has a“double peaks”，it shows two obvious peak points and one valley point. The arrival times of the two peaks and one valley are basically the same. As the average strain rate increases，the dynamic compressive strength decreases gradually when the axial pressure is constant. It is show that the weathered red sandstone has good strain rate effect. The smaller the impact load and axial pressure，the greater the energy utilization rate. On the contrary，the greater the axial pressure，the smaller the energy utilization ratio. With the increase of axial pressure，the peak value of energy utilization rate decreases gradually. The maximum value under different impact loads occur at the axial pressure of 0 MPa，and the maximum value is 24%.

Key words： rock mechanics weathered red sandstone stress wave dynamic compressive strength energy utilization rate

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	Articles by authors
	WANG Tong1
	SONG Zhanping1
	2
	YANG Jianyong3

Cite this article:

WANG Tong1,SONG Zhanping1,2, et al. Dynamic response characteristics of weathered red sandstone under cyclic impact[J]. , 2019, 38(S1): 2772-2778.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1448 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2772

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