CAJ | 학술논문

岩石结构面的代表性取样是开展不同尺寸模型结构面直剪试验的前提条件，直接影响到结构面抗剪强度尺寸效应试验结果的有效性和可靠性。通过对取样尺寸为10 cm的18组岩石结构面粗糙度系数(JRC)的测量和统计分析，得到该尺寸岩石结构面试样的粗糙度系数分布规律，表明模型结构面取样代表性评价的必要性。基于结构面粗糙度系数非均一性分布特点，以及对简单随机取样法和分层取样法2种概率取样方法的比较分析，提出基于分层取样法的岩石模型结构面代表性取样方法，该方法采用JRC四分位法确定各层样本的数量比例，再利用分层取样公式计算样本的取样数量。通过岩体结构面抗剪强度的力学机制分析，对试样取样代表性和力学可靠性进行校验，结果表明，采用该取样方法能较好地代表该尺寸的表面形态分布，取样结果也较好地满足力学试验的统计精度要求。
암석결구면적대표성취양시개전불동척촌모형결구면직전시험적전제조건，직접영향도결구면항전강도척촌효응시험결과적유효성화가고성。통과대취양척촌위10 cm적18조암석결구면조조도계수(JRC)적측량화통계분석，득도해척촌암석결구면시양적조조도계수분포규률，표명모형결구면취양대표성평개적필요성。기우결구면조조도계수비균일성분포특점，이급대간단수궤취양법화분층취양법2충개솔취양방법적비교분석，제출기우분층취양법적암석모형결구면대표성취양방법，해방법채용JRC사분위법학정각층양본적수량비례，재이용분층취양공식계산양본적취양수량。통과암체결구면항전강도적역학궤제분석，대시양취양대표성화역학가고성진행교험，결과표명，채용해취양방법능교호지대표해척촌적표면형태분포，취양결과야교호지만족역학시험적통계정도요구。
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.