三峡工程坝基花岗岩力学性能的微观分析

Microscopic Analysis of Mechanical Properties on Granite of Dam Foundation of Three Gorges Project

本文从矿物组成和微结构特征入手，分析了三峡工程坝区花岗岩的力学性能，通过对新鲜岩样、弱风化（下部）岩样、强风化岩样、全风化岩样的研究，认为大部分弱风化（下部）岩样在矿物组成和微观结构上与新鲜岩样差异不是很大，仍然具有较高的力学强度；强风化、全风化岩样强度极低，应予彻底清除。同时，文章简述了风化对岩石力学性能的影响，认为风化作用的实质是改变了岩石的微结构以及矿物组成乃至化学成分，从而影响了岩石的力学性能。

According to mineral constituent and microstructure of sample,the author analyzed granite of dam founda-tion for mechanical properties. Based on the analysis for fresh sample,poor weather(low),strong weather andall weather sample,the author would say that a great of poor weather(low)samples are much the same mineralconstituent and microstructure as fresh samples,and they still have stronger mechanical strength,but strengthof strong and all weather samples are very low,they have to be cleaned.At the same time,here,the author in-dicated the effect of weather on mechanical properties of rock,the weathering truly varied microstructure,min-eral constituent and chemical composition Therefore if had an effect upon mechanical properties of rock.