多元复合地基中桩土应力比的试验研究

通过对刚-柔性桩组合的多元复合地基模型在不同褥垫层厚度的静载荷试验所得的数据,分析了多元复合地基中桩土应力比、桩土荷载分担比随荷载的变化关系及不同褥垫层厚度对桩土应力的影响。试验结果表明:在刚-柔性桩组合的多元复合地基中,随着总荷载的增加,刚性桩分担的荷载百分比及桩土应力比均增加,而柔性桩及桩间土分担的荷载百分比均减小,随着褥垫层厚度的增大,刚性桩和柔性桩与土之间的应力比均降低,但刚性桩的桩土应力比减小的幅度比柔性桩大得多。

EXPERIMENTAL STUDY ON PILE-SOIL STRESS RATIO OF MULTI-ELEMENT COMPOSITE FOUNDATION

Based on the loading test data on multi-element composite foundation,the stress ratio of pilesoil,load sharing ratio of pile-soil under different applied loads are analyzed as well as the effect of the cushion height on stress of pile and soil is also discussed.The test results show as follows:the rigid piles' sharing loads and stress ratio of pile-soil will increase as the applied loads increase,while flexible piles' sharing loads and stress ratio of pile-soil decrease as the applied loads increase;the stress ratios of the both rigid pile-soil and flexible pile-soil will decrease with the increase of the cushion's height,and moreover,the decreasing extent of stress ratio of rigid pile-soil is much bigger than that of flexible pile-sol.