不同边载条件下刚性桩复合地基桩土荷载分担试验研究  

Experimental study on pile-soil load sharing of rigid pile composite foundation under different side loading conditions

作　　者：徐韶骏 马骥 Xu Shaojun;Ma Ji(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑科学》2020年第3期81-85,共5页Building Science

摘　　要：本文通过室内模型试验,结合现场实测资料,对刚性桩复合地基在不同埋深条件下的桩土荷载分担特性进行研究。试验以边载模拟埋深,对不同边载条件下刚性桩复合地基中桩土荷载分担进行实测与分析,结合工程实测,探究不同埋深情况下复合地基的桩土荷载分担规律,得到认识如下:①埋深效应导致桩间土承载力提高,因此随着边载提高复合地基承载力增大;②边载增加,土荷载分担增加,桩荷载分担降低,桩的承载力发挥系数λ降低;③随着总荷载增加,桩荷载分担增速加快,在桩的承载力设计和桩身强度设计中应考虑相应安全储备。上述研究结果丰富了复合地基的理论,对提高复合地基的认识,具有积极的指导意义。Through the indoor model test,combined with the engineering survey data,the pile-soil load sharing characteristics of rigid pile composite foundation under different buried depth conditions are studied. The buried depth with the side load is simulated,and the pile-soil load sharing in the rigid pile composite foundation under different side loading conditions is measured and analyzed. Combined with the engineering survey,the pile-soil load sharing law of the composite foundation under different buried depths is explored: ① With the increase of the side load,when the load reaches the characteristic value of the bearing capacity of the composite foundation,the load sharing of the soil becomes larger,and the load sharing of the pile decreases. As the side load increases,the coefficient of single pile bearing capacity decreases;② When the load increases,the soil load sharing increases when the characteristic value of the composite foundation bearing capacity is reached,and the bearing capacity of the pile gradually decreases;③ As the total load increases,the pile load sharing speed increases,and the corresponding safety reserve should be considered in the design of pile bearing capacity and pile strength design.The above research results enrich the theory of composite foundations and have positive guiding significance for improving the understanding of composite foundations.

关 键 词：刚性桩复合地基 边载 桩土荷载分担 单桩承载力发挥系数 

分 类 号：TU473.1[建筑科学—结构工程]