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Analytical method for laterally loaded piles in soft clay considering the influence of soil outside the scour hole on the effective overburden pressure
Acta Geotechnica ( IF 5.7 ) Pub Date : 2021-03-15 , DOI: 10.1007/s11440-021-01151-7
Fan Zhang , Guoliang Dai , Weiming Gong

Scour reduces the effective overburden pressure and the undrained shear strength of soil, thus affecting the lateral load-bearing capacity of pile foundations. Compared with general scour, local scour can decrease the reduction of the effective overburden pressure and the undrained shear strength around the pile due to the existence of soil outside the scour hole. To fully reflect the actual situation at a site, the behavior of laterally loaded piles in soft clay should consider both the scour-hole dimensions and the soil stress history. This paper proposes a closed-form analytical solution for laterally loaded piles in soft clay that can simultaneously account for the changes in effective overburden pressure and undrained shear strength caused by the scour-hole dimensions and the soil stress history based on the py curve proposed by Matlock. The average reduced stress is introduced according to Boussinesq’s point load solution. Case studies demonstrate that the analytical method is reliable with reasonable accuracy. According to the parameter study, the load eccentricity is the most sensitive factor compared with the changes in soil properties caused by the scour-hole dimensions and the soil stress history.



中文翻译:

考虑冲刷孔外部土壤对有效覆土压力影响的软黏土侧向受力桩分析方法

冲刷会降低有效的上覆压力和不排水的土壤抗剪强度,从而影响桩基础的侧向承载能力。与普通冲刷相比,局部冲刷可以减少有效覆土压力的降低,以及由于冲刷孔外部存在土壤而导致桩周围不排水的抗剪强度的降低。为了充分反映现场的实际情况,在软黏土中侧向荷载桩的行为应同时考虑冲孔尺寸和土壤应力历程。本文提出了一种软土推力桩,可以基于该同时考虑所造成的冲刷孔尺寸和土壤应力历史在有效覆层压力和不排水剪切强度的变化的封闭形式的解析解p– Matlock提出的y曲线。根据Boussinesq的点荷载解决方案引入平均减小的应力。案例研究表明,该分析方法是可靠的,并且具有合理的准确性。根据参数研究,与冲刷孔尺寸和土壤应力历程引起的土壤性质变化相比,荷载偏心率是最敏感的因素。

更新日期:2021-03-15
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