岩块尺度对摆型波传播影响研究

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Abstract Based on the grade blocks tectonic theory for discontinuous and self-stress rock mass in depth，the effect of block-rock hierarchy scale on pendulum-type wave propagation is studied. Acceleration response of every block-rock is solved in the block-rock dynamical model on shock loading. Acceleration and frequency characteristics including center frequency and center frequency bandwidth of the block-rock mass are calculated，under the same shock loading energy and different block-rocks scales. The comparison results show that，the higher grade of block-rock structures，the more fast attenuation of block-rock mass acceleration on shock loading，and the main attenuation area is focus on the initial area of the block-rock structures. Pendulum-type wave is a low velocity wave while propagation in the block-rock mass compared with P wave and S wave. The higher grade of block-rock structures，the more lower velocity of pendulum-type wave. Block-rock with a larger frequency band center and wider bandwidth concentrate in the initial area when the higher grade of block-rock structures. The block-rock frequency band center moving to low frequency and the bandwidth becomes smaller on pendulum-type wave propagation，which performance the characteristics of low frequency，however，the changing trend more significantly when the higher grade of block-rock structures. Degree of fragmentation and joint development in rock mass can be inversion by the time-domain and frequency-domain results and testing techniques.

Key words： rock mechanics hierarchy of block-rock pendulum-type wave rock dynamic response frequency band center

Received: 24 April 2012

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/Is2/3459

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