摘要
在滑坡治理与边坡防护工程中,圆形截面抗滑桩由于具有便于机械化成桩的施工优势,已被工程广泛应用。然而,与传统的矩形抗滑桩相比,目前对于圆形截面抗滑桩的研究较少,设计和理论体系不够完善,其抗滑效果尚无统一定论。基于圆形截面与矩形截面抗滑桩对比模型试验研究圆形截面与矩形截面抗滑桩的受力变形特征,比较两者的抗滑能力:在满足各试验相似关系的前提下,分别进行无桩空推试验、圆形截面抗滑桩试验和矩形截面抗滑桩试验。观察土体与模型桩受力发生变形的全过程,并对试验结果进行比较。布设土压力盒、钢筋计及百分表,对土压力、钢筋应力、桩顶位移进行监测,分析模型桩的受力特性。研究结果表明,相同条件下圆形截面抗滑桩的受力性能与矩形截面抗滑桩基本一致,受力过程中传力均匀,对桩底嵌固端强度要求低,具有良好的抗滑承载能力,值得在工程实际中推广应用。
In the landslide control and slope protection project, the circular cross-section anti-sliding pile has been widely used in geotechnical engineering practice because of its advantages of mechanized pile construction. However, compared with the traditional rectangular cross-section anti-sliding pile, there is less research on the circular cross-section anti-sliding pile, and the design and theoretical systems are not perfect enough. There is no unified conclusion on anti-sliding effect yet. In this study, the model experiments were conduct to investigate the force and deformation characteristics of circular section and rectangular section anti-slide piles, comparing their anti-slide abilities. On the premise of satisfying the similarity relation of each test, the pile-free push test,circular section anti-sliding piles test and rectangular section anti-sliding piles test were carried out respectively to observe the whole process of the deformation of soil and model piles. The experimental results were compared. Eearth pressure cells, reinforcement stress gauges, and dial indicators were arranged to monitor the earth pressure, reinforcement stress and displacement of pile top. The mechanical characteristics of the model pile were analyzed. The performance of circular cross-section anti-sliding piles is basically the same as that of rectangular cross-section anti-sliding piles under the same conditions. The force transfer is uniform in the process of loading, the requirement for the strength of the fixed end of the pile is low, and the anti-sliding bearing capacity is good. It is worth popularizing and applying in engineering practice.
作者
魏少伟
隋颜阳
杨建民
WEI Shao-wei;SUI Yan-yang;YANG Jian-min(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Beijing Tieke Special Engineering Technology Corporation Limited,Beijing 100081,China;Department of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin University,Tianjin 300072,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2019年第3期951-961,共11页
Rock and Soil Mechanics
基金
广东交通科技项目(No.2012-01-001-05)~~
关键词
抗滑桩
圆形截面
模型试验
anti-slide pile
circular section
model test
