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抗滑桩的合理桩间距是设计中的关键参数之一。本文通过桩间净距分别为4 d、5d和6 d的粘性土抗滑桩离心模型试验,分析了桩间土拱形态变化及破坏状态。试验结果表明,桩间距较大时,土拱曲线形状趋于平缓,土拱矢高较小,土拱的受力趋于梁的受力,难以形成稳定的土拱;桩间距较小时,土拱矢高较大,土拱的受力呈现受压的特征,容易形成稳定的土拱,即随着桩间距的增大,土拱效应减弱。同时从理论上分析了不同桩间距土拱的破坏图式,提出粘土中合理桩间净距为桩径的4倍左右,该结论对抗滑桩的设计具有一定的参考意义。
Reasonable pile spacing anti-slide pile design is one of the key parameters. In this paper, the centrifugal model tests of clay anti-slide piles with clearance between piles of 4d, 5d and 6d respectively are carried out to analyze the change of soil arches and the failure state between them. The test results show that when the pile spacing is large, the shape of soil arch tends to be gentle, the soil arch height is small, the force of soil arch tends to the force of the beam, it is difficult to form a stable soil arch. When the pile spacing is small, When the pile height is larger and larger, the force of soil arching shows the characteristics of compression, and it is easy to form a stable soil arching. With the increase of pile spacing, soil arching weakened. At the same time, the failure pattern of soil arching with different pile spacing is theoretically analyzed. It is proposed that the reasonable spacing between clay piles is about 4 times of the diameter of pile. This conclusion has some reference significance for the design of anti-slide piles.