窗口测线法获取岩体RQD

岩石质量指标RQD是评价岩体质量的一个重要指标，但这一传统的RQD完全取决于钻孔布置数量和方向。若钻孔数量有限，则误差较大，工程实际使用中受到限制。而采用在测量窗口中借助计算机布置测线的方法来计算RQD，可以减少误差，可综合反映岩体的各向异性特征，且可方便地获取大量的RQD，方法简便易行，适合于实际工程应用。

OBTAINING RQD OF ROCK MASS BY SAMPLING WINDOW METHOD

Rock quality of designation (RQD) is an very important index in rock mass quality evaluation. But the reliability and engineering application of conventional RQD are limited by the direction,the number of the bore holes available in investigation and hence the notable errors. The method of obtaining RQD of rock mass by sampling window is presented in this paper. Setting scan lines in all the directions automatically by computer program,the errors can be reduced and anisotropic properties of rock mass can be synthetically reflected by this new method,and a large number of RQD can be easily obtained. The method is simple and easy to handle in engineering application.