不同支护条件下开挖方式对二元结构边坡稳定性影响分析

Impact of the Different Excavation Sequences for the Stability of Deep Excavation Adjacent to a Soil Covered Rock Slope

以景德镇某地区二元结构基坑工程为研究对象,对采用锚杆和抗滑桩支护条件下采用整体开挖、分步开挖、整体跳挖、分步跳挖等四种开挖方式的基坑的稳定性进行定量分析。借助数值模拟软件建立支护模型,在边坡不同位置设置观测点,通过对比不同工况下模拟结果,总结出抗滑桩对于维持二元结构边坡稳定性具有可靠作用,采用分步跳挖的开挖方式更加有利于二元结构基坑边坡的稳定性。

The impact of different supporting systems for the deep excavation on the stability of an adjacent soil covered rock slope in Jingdezhen is presented in this paper.The stability of the slide resistant caisson with ground anchor supported deep excavation under four different excavation sequences was numerically evaluated.These four excavation sequences are：excavation at the entire site simultaneously;excavation area by area;excavation at alternate area;and excavation sequentially at alternate area.The movement at the soil covered slope were compared and it is concluded that the slide resistant caisson can effectively maintain the stability of the slope.It is also concluded that the excavation sequentially at alternate area method is more favorable to the slope stability.