中文摘要：

为了研究垫层厚度对长短桩复合地基工作性状的影响,在室内模型试验的基础上,对无垫层2、cm垫层和5 cm垫层三种情况下长短桩复合地基的荷载与沉降的关系、桩土应力比、荷载分担比等问题进行了分析,结果表明,长短桩复合地基的沉降量随着垫层厚度的增加而增加;长桩桩土应力比随垫层厚度的增加而减小,短桩桩土应力比的变化不如长桩明显;无垫层时,长桩荷载分担比较大,桩间土和短桩荷载分担比很小,铺设垫层后,随垫层厚度的增加,长、短桩荷载分担比都逐渐减小,桩间土荷载分担比逐渐增大。

英文摘要：

In order to study the impact of cushion thickness on the long-short piles composite foundation,the relation between bearing capacity and settlement, pile-soil stress ratio, and load sharing ratio were studied on the basis of laboratory tests in three different conditions.no cushion,2 cm-thick cushion and 5 cm-thick cushion. Conclusions are as follows, the settlement of long-short piles composite foundation increased with increasing cushion thickness; the pile-soil stress ratio of long pile decreased with increasing cushion thickness while the pile-soil stress ratio of short pile changed little; without custion the load sharing ratio of long piles was larger than that of short piles and soil, while with increasing cushion thickness, the load sharing ratio of long and short piles became smaller while that of soil became larger.