模型支盘桩在重复荷载作用下的工程性状研究  

The test study of model piles with branches and plates under repeatedly load on project performance

作　　者：汤丽君[1] 卢成原[1] 王珊珊[1] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310032

出　　处：《浙江工业大学学报》2007年第2期222-227,共6页Journal of Zhejiang University of Technology

基　　金：浙江省自然科学基金资助项目(502117)

摘　　要：为了研究支盘桩在重复加载下粉粘土中的工程性状,分别对一个双盘模型支盘桩在其极限荷载和0.75倍极限荷载的条件下各进行了5次重复加载-卸载试验;还在粉粘土和粉土中分别进行一次加载试验.根据试验结果,分析了在两种不同土层中支盘桩的承载力和变形特性;研究了重复荷载作用下模型支盘桩在粉粘土中荷载传递的特点、桩身不同位置压力变化的特点,特别是对桩周土体对桩侧表面产生的摩擦力出现复杂变化的原因进行了分析;还分析了离盘不同距离的土体在重复加载过程中的压力变化情况和原因.研究结果表明不同土质条件对支盘桩的承载力和变形有很大的不同,粉土中的工程性状要优于粉粘土;不同强度的荷载重复作用下对桩的沉降变形的收敛影响很大;支盘桩和桩周土体的相互作用机理十分复杂,因此要充分认识支盘桩在重复荷载作用下的工程性状和荷载传递机理还要做大量的研究.The model pile with two plates have repeated load-bearing and load-shedding tests for 5 times under the limit load and 0.75 times of the limit load, in order to studying the project behavior of the pile with plates and branches in slime. The simple loading test in silt and silty clay has also been taken. According to the test results, the bearing capacity and deformation characteristics of the pile in the two different soils have been analyzed. The pile＇s characteristics about load transfer in silty clay, characteristics of pressure changing on different places of pile have been studied, especially the reason why the skin friction of the soil to the pile would appear complex changing has been analyzed. In addition the situation and reason of the pressure changing of soil with different distance from the plate during the repeated loading has been analyzed. It is concluded that the bearing capacity and deformation of the pile is obviously different under different soil conditions, silt is better than silty clay; the repeated loadings of different intensity loads impact obviously to the convergence of settlement deformation. Because of the complex of the mutual effect mechanism of the pile and the soil, further studies should be done to understand the project behavior and load transfer mechanism of the pile with plates and branches under repeated loading.

关 键 词：支盘桩 粉粘土 工程性状 荷载传递机理 模型试验 

分 类 号：TU473[建筑科学—结构工程]