桩土荷载分担比量化的概率模型

Research on a Probability Model of Quantification of Pile-soil Load Share Ratio

运用随机理论,基于二维模拟实验,对刚性桩复合地基褥垫层材料中应力场的分布规律进行了细观研究。结果表明:桩体刺入时,褥垫层在不断的自组织搭拱中产生了一个应力转移的过程;垫层的刚度、材料各向异性的程度与桩土应力比成正比,来源于搭散粒拱、应力的横向转移,力链伸向桩体。探讨了一个简化的量化荷载分担比的概率模型,为更好地研究刚性桩复合地基的可预测性以及其它多种材料组合系统结构的预报研究提供了参考和借鉴。

Based on the two-dimensional simulation experiment and used the stochastic theory,the distribution of stress field in the cushion material of the rigid pile composite foundation was microscopic ally studied. The analysis shows that： there is a stress transfer process in the cushion layer continuous self-organization when the pile body piercing,cushion stiffness and degree of material anisotropy are proportional to the pile-soil stress ratio,which is derived from granular arch and horizontal transfer of stress,and force chain extends to the pile body. Moreover,a probability model of simplified estimation bearing ratio is given with the theory of random. The research should be helpful to research the predictability of rigid pile composite foundation and structure of disaster forecasting.