EXPERIMENTAL STUDY OF SAMPLING REPRESENTATIVENESS
OF STRUCTURAL PLANE OF ROCK MODEL
HUANG Man1，LUO Zhanyou 2，DU Shigui1
(1. Department of Civil Engineering，Shaoxing University，Shaoxing，Zhejiang 312000，China；2. Institute of Geotechnical Engineering，Zhejiang University of Science and Technology，Hangzhou，Zhejiang 310023，China)
Abstract：Representative sampling of rock joints is the precondition for direct shear test of the structural plane models with different sizes，which directly affects the effectiveness and reliability of the experimental result of shear strength scale effect. The joint roughness coefficient(JRC) distribution regularity is obtained by analyzing the statistical results of JRC distribution of 18 groups of rock joints with size of 10 cm. The statistical results indicate the necessity of representative evaluation for structural plane models. According to the distribution features of the nonuniformity of JRC，and the comparative analysis between simple random sampling method and stratified sampling method，the representative sampling method of structural plane model based on stratified sampling is proposed. The stratified proportions are determined by the quartile method of JRC. The sampling quantity is calculated through the stratified sampling formula. The sampling representativeness and mechanical reliability are inspected by the mechanical mechanism analysis of rock joints shear strength. The results show that the sampling method can represent the distribution of surface morphology for the certain size；and the sampling result also preferably meets the accuracy requirement of mechanical experiment.
2013, Vol. 32 
