Abstract: Mixed retaining structure is usually used in the treatment engineering of high and steep slope，geological complicated environment slope． It is a comprehensive retaining systeMwhich is set in the top and bottoMof the slope to withstand loads of rock and soil slope by the interaction and coordination of different retaining structure．According to the design prac- tice，there are nine types of common mixed retaining structures and the study on the mechanics characteristic and design method of mixed retaining structure is very necessary．Different retaining structures are not isolated，but has effects on each other．The effects can be direct or indirect passing through the rock and soil mass． The key probleMin geotechnical engi- neering and construction is hoWto consider the efect．

Key words: mixed retaining structure, mechanical characteristic, design methods, interaction

摘要： 混合支挡结构常运用在高陡边坡、地质环境复杂的边坡治理工程中，它是在边坡的上下部通过不同的支挡结 构相互作用、相互协调共同承受边坡岩土体荷载的综合支挡体系。根据设计实践，常见混合支挡结构有9种类型， 对混合支挡结构的力学特征、设计方法的分析研究是很有必要的。不同支挡结构并不孤立，而是相互之间存在着作 用，这种作用可是直接的，也可是通过岩土体间接传递，设计施工关键的问题是如何考虑这种作用。

关键词: 混合支挡结构, 力学特征, 设计方法, 相互作用