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为了在施工前根据地勘的基本资料准确地对山区高速公路深挖路堑边坡进行施工安全稳定性评价,依托资溪花山界(赣闽界)至里木高速公路中的深挖路堑边坡工程,采用极限平衡法和有限元法对不同断面形式、不同高度、不同加固程度的深挖路堑边坡在施工过程中各个工况下的安全系数、位移场进行了对比分析。结果表明:深挖路堑边坡的稳定性主要与挖方高度、边坡坡面坡度、地层地形差异等因素有关;边坡施工过程中坡面变形较大区域主要集中在全风化层和强风化地层;地形的不同与卸荷的不均匀会导致坡面开挖后侧向变形趋势的不同;深挖路堑边坡处于强风化地层的路基相比中风化地层的路基回弹变形更大,且垂直差异变形更大。
In order to accurately evaluate the construction safety and stability of deep excavation of mountain slopes based on the basic data of geological prospecting before construction, relying on the deep excavation of slope in Lishu Expressway , The safety factor and displacement field of deep-cut cutting slopes with different cross-section forms, different heights and different degrees of reinforcement during construction are contrasted and analyzed with the method of limit equilibrium and finite element method. The results show that the stability of deep cutting slope is mainly related to the height of excavation, the gradient of slope, the difference of formation topography and other factors. In the process of slope construction, the deformation of slope is mainly concentrated in the fully weathered layer and strongly weathered layer ; The difference of topography and the unhomogeneity of unloading will lead to the different tendency of lateral deformation after slope excavation; the embankment of deep-cutting cut in strong weathered formation is more deformation than that of weathered formation, Differences greater distortion.