采用波动方法探测土石混合体结构特性的可行性研究

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Abstract Soil-rock mixtures are seen as the macro-density and equivalent homogeneous medium constituted by soil and rock under random distribution；and the explosion effect of deep explosion source is replaced by equivalent impact load. The platform of continuum media mechanics of discrete element method(CDEM) is used；and the uniform random technique is adopted. By studying the impact of internal structural properties of soil-rock mixtures on stress wave propagation process，the relationships between internal structural properties(including percentage of rock，feature size of rock block and distribution of soil-rock) and wave responses are established. The study results show that in certain of the same loading and material properties，the maximum amplitude and dominant frequency of acceleration wave have regular changes under the effect of percentage of rock and feature size of rock block. Under the uniform distribution，the impact of different distributions of soil-rock on wave response is very small and can be neglected. The fitting surfaces of wave response(maximum amplitude and dominant frequency) with the variations of percentage of rock and feature size of rock block are given；and the maximum amplitude and dominant frequency both meet the testability of actual project. Taking an assigned wave response for example，percentage of rock and feature size of rock block are given easily on the fitting impact surface by means of the assigned maximum amplitude and dominant frequency. The feasibility of wave method for detecting structural properties of soil-rock mixtures is illustrated from three aspects of regularity，testability and handleability.

Key words： rock mechanics soil-rock mixtures wave method percentage of rock feature size of rock block distribution of soil-rock

Received: 04 March 2011

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http://www.rockmech.org/EN/Y2011/V30/I9/1855

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