外海深埋沉管隧道基槽水下边坡设计与稳定性分析

Design and stability analysis of submerged trench slope for deep buried immerse tunnel in external sea

以港珠澳沉管隧道为背景,针对其基槽边坡开挖深度大,地层地质条件复杂,受波浪、沉船等因素影响的特点,论述了基槽开挖设计的原则和方法,对边坡稳定性进行探讨,并通过试挖槽试验进行验证.结果表明,深埋沉管隧道基槽边坡最不利滑动面多位于上部地质条件较差土层,边坡根据地层分级设置是合理的,同时外海沉管隧道基槽应考虑波浪、地震、沉船等荷载作用.

Taking HZM immerse tunnel as the background,the design and stability analysis of submerged trench slope are discussed,specifically for the characteristics of the deep excavation,complicated geology condition and particular effects such as wave and shipwrecks,and excavation experiment is carried out to verify the stability of the slope.The results show that the slip faces are located in upper part of mucky layer,and slope classification by stratum types is rational.Wave,earthquake and shipwrecks should be considered during the analysis.