长短桩组合桩基础地基中的应力场和位移分析  

Stress and Displacement in Subsoil of Long-Short Pile Foundation

作　　者：杨桦[1] 杨敏[1] 王伟[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《同济大学学报（自然科学版）》2006年第5期593-597,共5页Journal of Tongji University:Natural Science

摘　　要：利用有限元方法研究了当土层中存在上、下两层或多层可供利用的桩端持力层时,全短桩、全长桩及长短桩组合桩基础土中附加应力和沉降组成各部分大小的变化规律.从应力角度探讨了长短桩组合桩基础对沉降的控制作用.结果表明,由于长桩的存在,将部分荷载传至深层土体,减少了短桩软下卧层土中的附加应力值,从而有效地控制了沉降;同时又充分利用了浅层持力层的承载能力,减少了长桩用量.The stress and settlement distribution of the short pile foundation, long pile foundation, longshort pile foundation have been calculated and compared by finite element method（FEM）, when there are two more bearing strata in soil. The result shows that the whole settlement of the foundation can be reduced effectively by means of long-short pile foundation. The long piles transfer the load to deeper soil layer and then reduce the applied vertical stress in substratum of the short piles. When the capacity of the lower bearing stratum is brought into full play, the number of long piles reduces.

关 键 词：长短桩 应力场 有限元 

分 类 号：TU473[建筑科学—结构工程]