(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. China Railway Siyuan Survey and Design Group Co.，Ltd.， Wuhan，Hubei 430071，China)
Abstract：A node quasi-static method to calculate the safety factor of rock slopes under blasting case is given. Potential sliding surface slope position，failure mode and safety factor of slopes undertaking the blasting loads can be obtained by the node quasi-static method. The node quasi-static method consists of three parts. Firstly，secondary development on UDEC4.0 is conducted based on the FISH language embedded in UDEC4.0，and the calculation program considering the attenuation law of blasting vibration peak acceleration with blast center distance and elevation difference is written. Secondly，strength reduction calculation program is written based on the basic principles of strength reduction. Finally，choosing the discrimination method for slope critical state，and a new slope failure criterion that utilizes the maximum node displacement duration curve to determine the slope critical state is proposed in this paper. Through comparing with the calculation results obtained by UDEC system procedure，the correctness and feasibility of the node quasi-static method is verified. Finally，the node quasi-static method is applied to the blasting design and stability evaluation of Yunfu pyrite open-pit slope.
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2014, Vol. 33 
