基于强度折减法的港珠澳大桥沉管隧道干坞工程高边坡稳定性分析

在列举和分析比较当前岩土工程领域边坡稳定性分析的各种主要方法的基础上,概述了强度折减法的基本原理、主要特点和优势,并以港珠澳大桥沉管隧道干坞大型临时工程拟建场地的岩质高边坡为实例,应用强度折减法基于FLAC3D软件对该边坡的稳定性进行了计算和分析,确定了边界条件和强度参数,计算了该边坡的安全系数,结果表明自然工况下边坡处于稳定状态,底部开挖以后边坡趋于欠稳定状态,同时指出了边坡的关键变形部位,可为后续的设计和施工提供参考。

Stability Analysis of High Rock Slope in the Dry Dock Project of Hong Kong-Zhuhai-Macao Bridge Immersed Tube Tunnel Based on Strength Reduction Method

This paper enumerates several mainly used analysis methods of side slope stability in the current geotechnical engineering field.By comparative analysis,the characteristics and advantages of the strength reduction method are discussed as well as the basic principles of the method.The safety factors for calculating the side slope stability with the strength reduction method are based on FLAC3D.Taking the high rock slope in the dry-dock large-scale temporary engineering construction site of Hong Kong-Zhuhai-Macao Bridge immersed tube tunnel for example,the paper analyzes the engineering geology of the side slope and then defines its boundary conditions and intensity parameters.The results show that the slope had been in a stable state under natural condition;however,after the bottom excavation it became less stable.The paper also figures out the key deformation parts of the slope,hoping to provide some useful reference for the follow-up engineering design and construction.