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在路堑边坡施工过程中,研究边坡后缘的变形趋势可以较早地提供整个边坡的变形的信息,对整个施工过程有实际的工程意义。基于数值模拟和现场监测结果,以漳州招银疏港高速公路A3标边坡(ZK14+165)为例来探索在施工过程中路堑边坡上缘的变形演化过程。结果表明:1)除了新开挖平台由于卸荷引起的变形以外,边坡上缘是产生变形的主要区域;2)随着开挖施工的进行,上缘变形越来越大,靠近开挖面处最大;3)变形发生在坡顶以上10m左右的范围内(针对此开挖高度为38.8m的路堑边坡),变形区域由上缘坡面到开挖面近似螺旋曲线的形状。
In the process of cutting slope construction, studying the deformation trend of the slope at the back of the slope can provide the information of the deformation of the whole slope earlier, and has practical engineering significance to the whole construction process. Based on the numerical simulation and on-site monitoring results, the deformation and evolution of the upper edge of the cutting slope during the construction process are explored based on the A3 standard slope of Zhaoxing-Shugang Expressway (ZK14 +165). The results show that: 1) The upper edge of the slope is the main deformation area except for the deformation caused by the unloading of the newly excavated platform; 2) As the excavation progresses, the deformation of the upper edge is larger and larger, 3) Deformation occurred in the range of about 10m above the top of the slope (for the cutting slope with excavation height of 38.8m), and the deformation area is in the shape of an approximate spiral curve from the upper edge of the slope to the excavation face.