黄河沙坡头水利枢纽坝基岩体工程地质特性研究

沙坡头坝基岩体以石炭系泥、页岩为主，具有亲水性强，遇水软化、崩解，失水干裂的特性，且具有膨胀性。泥、页岩中微结构面发育，力学强度极低，属极软岩。系统分析了泥、页岩物理力学特性、水理特性、地球物理特征及基坑变形特征，并对参数选取原则和基础处理措施进行了论述。

Study on Engineering Geologic Characteristics of Rock Mass for Dam Foundation of Shapotou Water Control Project

The rock mass for dam foundation of Shapotou Water Control Project is mainly composed of the Carboniferous system mudstone and shale. It is characteri zed by a strong hydrophilicity and it can be softened and collapsed when meeting water and be weather shaken when losing water, with expansibility. The structur e surface in mudstone and shale is developed and the mechanical strength is very low, belonging to soft rock. In this article, the physical and mechanical chara cteristics of the mudstone and shale, the hydraulic characteristics, the geo phy sical characteristic and the deformation characteristic of the foundation pit ar e analyzed systematically. The principle on selecting parameters and foundation treatment measures are also demonstrated.