基于抗滑承载力的单排抗滑桩最大桩间距计算方法

Calculation method of the maximum distance of anti-slide piles in one row based on its capacity of shearing resistance

目前关于抗滑桩最大桩间距的研究都是基于桩间土拱效应,不同计算方法之间的结果区别较大,更重要的是当滑体黏聚力c=0时,其桩间距计算结果也等于0,这显然与实际不符。在利用抗滑桩斜截面受剪承载力计算其最大抗滑承载力的基础上,根据极限状态下单根桩的最大抗滑承载力恰好等于桩间距范围内滑坡的剩余推力,推导了基于抗滑桩斜截面受剪承载力的最大桩间距计算公式,并用工程实例验证了其合理性。结果表明,当抗滑桩的截面尺寸确定以后,最大桩间距与设桩处的滑坡剩余推力成反比,滑坡剩余推力越大,桩间距越小,反之亦然。本方法计算简便,利于推广。

Current calculation methods of the maximum spacing between two adjacent anti-slide piles are based on the soil arch effect,and different calculation methods are with different results. what is disaccord with the fact is that when cohesive force c = 0 of the landslide,the calculated maximum pile spacing is also 0. This paper calculates the maximum anti sliding resistance capacity based on the shear resistance capacity on the oblique section of the anti-slide pile. Taking into consideration that the maximum anti-slide resistance capacity of signal pile is exactly equal to the residual thrust within the pile spacing,so the formula applied to calculate the maximum spacing were deduced based on the shear resistance capacity on the oblique section of the antislide piles,and the rationality of the formula was verified by a practical engineering project. The results show that when the section size of the anti-slide pile is determined,the maximum pile spacing is inversely proportional to the residual thrust at the pile site,the larger the residual thrust,the smaller the anti-slide pile spacing,and vice versa. This calculation method is simple and convenient to promote.