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抗滑桩是土质边坡滑坡防护和治理的一种重要手段,抗滑桩上滑坡推力是桩截面和配筋设计的重要依据。目前国内外广泛采用的抗滑桩滑坡推力计算式是由Ito基于塑性变形提出的。土拱效应是抗滑桩与桩间土体由于相对滑移而发挥剪切力产生的,对滑坡推力的大小有重要影响。通过考虑土拱效应,结合Ito塑性变形思想,提出滑坡作用在抗滑桩上水平推力的新计算式,采用该式确定滑坡推力。与Ito原文算例中的计算值和实测结果进行比较表明:推荐式的计算结果更符合实测结果。
Anti-slide piles are an important means of landslide protection and treatment. The thrust of anti-slide piles is an important basis for pile section and reinforcement design. At present, the formula of thrust force of anti-slide pile landslide widely used in China and abroad is proposed by Ito based on plastic deformation. Soil arching is caused by the shear force exerted by the relative slip between the anti-slide pile and the soil between the piles, which has an important influence on the size of the landslide thrust. By considering the soil arching effect and combining with the Ito plastic deformation theory, a new formula for horizontal thrust of landslide acting on anti-slide piles is proposed. The formula is used to determine the thrust of landslide. Compared with the calculated results and the measured results in the original Ito example, the results show that the recommended calculation results are more in line with the measured results.