边坡工程中抗滑桩合理桩间距的探讨

Discussion on rational spacing between adjacent anti-slide piles in some cutting slope projects

在对边坡工程中抗滑桩间土拱效应分析的基础上,提出应以桩间静力平衡条件、跨中截面强度条件以及拱脚处截面强度条件共同控制来确定桩间距。得到了较为合理的桩间距的计算公式,定量地说明了在其它因素不变的情况下,桩间距随桩后土体粘聚力或内摩擦角的增大而增大,却随着桩后坡体推力的增大而减小。最后以工程实例说明了桩间距的计算过程,并得到了比较合理的计算结果。

Based on the analysis of soil arch effect between adjacent anti-slide piles in some cutting slope projects, some control conditions are provided to calculate rational spacing between adjacent piles.These conditions are static equilibrium equation between slope thrust on the soil arch and resistance on its two end sections near the two piles, intensity principle of the point at internal edge of medial cross-section of the soil arch and intensity condition of two end sections of the soil arch. The rational calculation formula of spacing between adjacent piles is got. According to the formula, it is quantitatively shown that the spacing is increasing with increase of cohesion or internal friction angle of soil behind piles and decreasing with increase of slope thrust behind piles while other effective factors are not varying. In the end, the calculation procedure of spacing between adjacent piles is illustrated by a practical project and the result is rational.