螺杆灌注桩承载特性透明土模型试验研究  

Experimental study on the bearing characteristics of screw grouting piles using transparent soil model

作　　者：汪皓 黄雪峰 马泽慧[4] 彭桂皎 王新华 WANG Hao;HUANG Xuefeng;MA Zehui;PENG Gujiao;WANG Xinhua(Hehai College,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Department of Military Facilities Engineering,Army Service College,Chongqing 401311,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Hainan Zhuodian High-tech Development Co.,Ltd.,Haikou 570208,China;Chongqing Zhuodian Construction Engineering Co.,Itd.,Chongqing 401120,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]兰州理工大学土木工程学院,甘肃兰州730050 [3]陆军勤务学院军事设施工程系,重庆401311 [4]重庆交通大学土木工程学院,重庆400074 [5]海南卓典高科技开发有限公司,海南海口570208 [6]重庆卓典建设工程有限公司,重庆401120

出　　处：《四川建筑科学研究》2024年第6期91-98,共8页Sichuan Building Science

基　　金：重庆市研究生联合培养基地建设项目(JDLHPYJD2021004)。

摘　　要：螺杆灌注桩自面世以来在工程中被广泛应用,但是对于其承载特性的研究主要集中于竖向抗拔与抗压方面,对于水平荷载和联合荷载作用下的承载特性研究较少。基于室内透明土模型试验以及非介入式测量的粒子图像测速(particle image velocimetry,简称PIV)技术,对螺杆桩和直杆桩在竖向上拔荷载、水平荷载和竖向、水平联合荷载作用下的承载特性以及桩周土体位移场进行了研究,得到了在不同方向荷载作用下螺杆桩和直杆桩的荷载-位移曲线和桩周土体位移矢量图。分析结果得到了以下结论:(1)螺杆桩竖向抗拔承载力较等直径直杆桩提升约32%,且在同一荷载条件下螺杆桩的位移控制能力要强于直杆桩;(2)在承受水平荷载作用时,螺杆桩水平承载力与位移控制能力和直杆桩无较大差别;(3)联合荷载作用时,螺杆桩的承载力要大于直杆桩,且桩周土体的位移变化会削弱地基的水平承载力;(4)螺杆桩的螺牙对桩周土体的挤密以及咬合作用是这个桩型承载力和位移控制能力都优于同尺寸直杆桩的主要原因。Since its inception,screw grouting piles have been widely used in engineering,but research on their bearing characteristics mainly focuses on vertical pull-out and compression resistance,with less research on their bearing characteristics under horizontal and combined loads.This article was based on indoor transparent soil model experiments and non-invasive measurement PIV(particle image velocimetry)technology to study the bearing characteristics of screw piles and straight rod piles under vertical uplift load,horizontal load,and combined vertical and horizontal loads,as well as the displacement field of the soil around the pile.The load-displacement curves and displacement vector diagrams of screw piles and straight rod piles under different directions of load were obtained.The analysis results show that the vertical pull-out bearing capacity of screw piles is about 32%higher than that of straight rod piles with equal diameter,and the displacement control of screw piles is stronger than that of straight rod piles under the same load conditions.When subjected to horizontal loads,there is no significant difference in the horizontal bearing capacity and displacement control ability between screw piles and straight rod piles.When subjected to combined loads,the bearing capacity of screw piles is greater than that of straight rod piles,and the displacement changes of the soil around the piles will weaken the horizontal bearing capacity of the foundation.The squeezing and interlocking effect of the screw teeth on the soil around the screw pile is the main reason why the bearing capacity and displacement control ability of this pile type are higher than those of straight rod piles of the same size.

关 键 词：螺杆灌注桩 模型试验 竖向上拔荷载 水平荷载 联合荷载 

分 类 号：TU473.1[建筑科学—结构工程]