软土地区小型预制桩承载特性模型试验研究  

Model Test Study of Bearing Behavior of Small Prefabricated Piles in Soft Soil Area

作　　者：孙雅珍 刘畅[2,3] 卞荣 王金昌[5] Sun Yazhen;Liu Chang;Bian Rong;Wang Jinchang(Traffic Engineering Institute, Shenyang Jianzhu University, Shenyang 110168, P.R. China;College of Science, Shenyang Jianzhu University, Shen yang 110168, P.R. China;School of Mechanical ＆ Automotive Engineering, Yangzhou Polytechnic Institute, Yangzhou, Jiangsu 225127, P.R. China;State Grid Zhefiang Electric Power Company, Hangzhou , 310007, P. R. China;Traffic Engineering Institute, Zhejiang University, Hangzhou 310012, P. R. China)

机构地区：[1]沈阳建筑大学交通工程学院,沈阳110168 [2]沈阳建筑大学理学院,沈阳110168 [3]扬州工业职业技术学院机械与汽车工程学院,江苏扬州225127 [4]国网浙江省电力公司,杭州310007 [5]浙江大学交通研究所,杭州310012

出　　处：《地下空间与工程学报》2018年第2期355-361,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家电网浙江省电力公司科研项目(5211JY150006);国家自然科学基金(51478276)

摘　　要：通过模拟软土地区小型预制桩原型桩基础的受荷情况,利用相似原理,自主设计一套室内管桩模型试验方案,包括单桩和群桩的水平静载试验、竖向抗拔静载试验以及竖向受压静载试验,对不同荷载下小型预制管桩的水平及竖向承载力特性进行缩尺模型试验研究。结果表明:2×2群桩水平效率系数为0.75,抗拔效率系数为0.66,抗压效率系数为1.12,3×3群桩水平效率系数为0.52,抗拔效率系数为0.62,抗压效率系数为1.06。试验所得群桩效率系数与按照规范计算所得理论值大体一致但都略大于理论值,说明现行桩基规范的群桩效应综合系数法计算群桩效率系数是可行的,但若采用规范表取值则较为保守。该模型试验研究对软土地区小型预制管桩工程设计和应用提供了一定的参考依据。To study the horizontal and vertical bearing behavior of small prefabricated single piles and pile groups under different loads,an indoor test program for the pile models,including the horizontal static,the uplift static and the compression load test,is designed. The bearing behaviors of small prefabricated piles in soft soil area are simulated by the tests with the principle of similarity. The results show that for the 2 by 2 pile group,the horizontal,uplift and compression efficiency coefficient are 0.75,0.66 and 1.12 respectively,and for the 3 by 3 pile group,the coefficients are 0.52,0.62 and 1.06 respectively. The measured group effect coefficients are in agreement with,but slightly larger than the theoretical values. These findings indicate that the comprehensive coefficient method of pile group effect coefficient formula is applicable but relatively conservative. The results provide a reference to the engineering design for small prefabricated piles in soft soil area.

关 键 词：小型预制桩基础 模型试验 承载特性 软土地区 

分 类 号：TU473.1[建筑科学—结构工程]