斜坡岩体卸荷分带量化研究

岩体卸荷及卸荷带划分一直是水利水电工程地质研究的重要内容，它是影响坝基建基面选择的主要因素之一。作者在分析国内外岩体卸荷分带研究成果基础上，提出了采用裂隙开度、裂隙条数、纵波速度、透水性系数等作为岩体卸荷分带的量化指标，并采用裂隙开度、裂隙条数、纵波速度对工程区部分平洞岩体进行卸荷带划分，其结果与现场定性划分的卸荷带界线基本一致。岩体卸荷分带量化指标的建立为岩体卸荷带划分的工程实践提供了参考依据。

A QUANTITATIVE STUDY ON THE CLASSIFICATION OF UNLOADING ZONES OF ROCK MASS SLOPE

In the research of water conservancy and hydroelectric projects, the rock mass unloading and classification of unloading zones are very important contents. At the same time, they are main factors that affects the choice of the bearing surface of a dam foundation. On the basis of the foregone research results, this paper puts forward quantitative indexes of classification of unloading zones: fissure aperture, fissure amount, longitudinal wave velocity and coefficient of permeability. Using these indexes to classify unloading zones, the result is accordant with qualitative investigation on the spot. These indexes offer reference evidences of classification of unloading zones for rock mass slope engineering.