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土钉墙和桩排组合支护是基坑工程中一种新的挡土形式,其上部的土钉墙和下部的桩排协同作用,使得它受到的土压力和发生的变形既不同于土钉墙,也不同于桩排支护。针对这种组合支护一基坑实例,用三维数值模拟实验方法,探讨了空间受力与变形的特征。分析结果表明,这种组合支护:(1)实际受到的土压力与由郎肯理论确定的土压力不相同,文中给出了修正系数。与单纯的桩排支护相比,它的被动土压力增加约20%,而土钉墙面层最大土压力则减少了近50%;(2)发生的最大变形与本文提出的组合支护无量纲整体刚度系数相关。相同地质条件下,当整体刚度系数从4 000增加到5 000时,组合支护变形有明显减少的趋势。
The combination of soil nailing wall and pile row support is a new type of retaining structure in the foundation pit engineering. The soil nailing wall and the lower pile row in the upper part cooperate with each other so that the earth pressure and the deformation of soil pile are different from the soil Nail wall, but also different from pile support. Aiming at this kind of combined support-foundation pit example, the three-dimensional numerical simulation experiment method is used to discuss the characteristics of space force and deformation. The analysis results show that this combination of support: (1) The actual soil pressure and soil pressure determined by the Rankine theory is not the same, the paper gives the correction factor. Compared with pure pile support, the passive earth pressure increases about 20%, while the maximum soil pressure on soil nail wall decreases by nearly 50%. (2) The maximum deformation and the combined support proposed in this paper Dimensionless integral stiffness coefficient. Under the same geological conditions, when the overall stiffness coefficient increases from 4 000 to 5 000, the deformation of the composite support decreases obviously.