Quantitative correlation method has been applied effectively in analyzing the distribution of fracture groups to identify structural boundary. The application results of the method published from past decades.

In this paper, we present some results of analyzing quantitative correlation of 1494 fracture measurements from 08 different survey sites in Ocdovic-Silua sedimentary rocks on Coto island, belong to Quangninh province of Vietnam by using correlation equation. The obtained results showed that the correlation values among sites are quite good, almost greater than 70%. These results can confirm that the survey sites belong to a structural unit and be affected by the same geodynamic circumstances.

The results obtained from the experiment in this paper have important significantly in identifying the direction of forces which cause rockmass destruction.

1. Introduction

A structural domain shows a volume of rock mass and is characterized by a distinct fracture pattern distribution of the intensity, orientation, spacing, size and shape. However, in this study, the determining structural domain only use the number of fractures (intensity) and their orientation distribution.

The identification of structural domain considered from many past decades by Miller (1983), Kulatilake et al. (1990), Martin et al. (2004) because of its close relationship to potential failure of rock blocks on the slope. Recently, Nguyen et al. (2012) also used correlation coefficient method to analyze fracture frequency along a tunnel and determine structural domain boundaries.

The above studies provided helpful tools for determining fracture patterns inside the rockmass and identifying structural domain boundaries.

In this study, using 1494 fracture measurements from 08 different sites in Ocdovic-Silua sedimentary rocks on Coto island, belong to Quangninh province of Vietnam, we continue extending the correlation coefficient method for identifying the relationship among fractures as a basis to determine the forces caused rockmass destruction in this area.

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