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Abstract Taking the Baihua Bridge rock slope which is seated in Yingxiu Town as case study，three-dimensional discontinuity network simulation method is used to calculate the rock quality designation(RQD). On the basis of accessing discontinuity simulation parameters by statistics of discontinuity measurement data，three-dimensional discontinuity network picture is got by Monte Carlo method. Fifty four survey lines on behalf of drill are fixed up in all directions of main sliding planes，main sliding cross-sections and main sliding horizontal planes. Every RQD value of drilling is obtained by statistics of percentage ratio of sum of core length more than 10 cm of each drill core to total drilling，and then the final RQD value is defined as the expected value of these 54 RQD values. At the same time，volume RQD method is also used to calculate RQD. The relative error can be got by comparing the results from the two methods and the equivalent drilling RQD which is gained by measuring discontinuity surface. The relative error of volume RQD method is 24.6%，simultaneously relative error of three-dimensional discontinuity network simulation method decreases to 3.3%. It is proved that the three-dimensional discontinuity network simulation method has a low relative error and a high accuracy. Consequently，it is a good method to calculate RQD，and has a broad prospects in practical application.
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Received: 21 October 2011
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2012, Vol. 31 
