裂隙岩体力学参数的弱化处理

Weakening Treatment to the Mechanic Parameters of Fissured Rock Mass

合理确定含裂隙岩体力学参数是岩土工程设计和岩体数值分析的基础和关键 ,在众多裂隙岩体力学参数弱化处理方法中 ,Hoek Brown准则表现出很好的适用性 ,尤其适用于深厚覆盖层以下的岩体。结合小浪底水利枢纽工程和镇江—扬州长江公路大桥对弱化方法予以介绍和探讨。

It is basic and crucial for geotechnical engineering design and numerical value analysis of rock mass to confirm the mechanic parameters of fissure bearing rock mass. In the weakening treatment of many fissured rock mechanic parameters, Hoek brown rule is characteristic of good applicability, especially for the rock mass beneath deep overburden. Based on two examples, Xiaolangdi Hydro Junction Project and Zhenjiang—Yangzhou Yangtze River Bridge, the authors will introduce and discuss some common weakening methods in which BQ and Hoek brown methods are the most feasible because they take two factors of block intensity and structural plane into consideration. The application of either method should be flexible according to engineering scale,rock mass characters and exploration stage as well as economic benefit.