悬臂式抗滑桩桩间竖直拱的拱形及力学分析  

Analysis on Geometry and Mechanics of Vertical Arching between Cantilever Piles

作　　者：李新哲[1,2] 王振强[2] 覃勤 傅翔[2] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]重庆大学土木工程学院,重庆400030 [3]云南省公路科学技术研究院,昆明650051

出　　处：《地下空间与工程学报》2014年第2期329-332,339,共5页Chinese Journal of Underground Space and Engineering

基　　金：宜昌市科学技术研究与开发项目(A2012-302-02);重庆市国土资源和房屋管理局科技计划项目(CQGT-KJ-2012021)

摘　　要：在对悬臂式抗滑桩对边坡支护所产生的土拱效应分析的基础上,提出了桩间竖直拱的存在及合理桩间距,通过桩间竖直拱的受力特征,得出竖直拱的拱形为悬链线,通过拱脚的受力平衡及拱顶截面满足摩尔库仑定理得出竖直拱存在的最大桩间距,并定量地说明了竖直拱的拱跨随土体的粘聚力和内摩擦角的增加而增加,拱高的变化除了与桩间净距相关之外,随桩间土荷载的增加而减小。最后,通过工程实例对计算公式进行了验证,得出的最大桩间距符合工程实际。The existence of the vertical arch and reasonable pile spacing between piles were put forward based on the analysis of the soil arch effect of slope support from cantilever anti-slide pile. It is concluded according to the ver- tical force characteristic of arch that the vertical arch has a shape of catenary. Through the force balance of the arch foot it is concluded that the vertical arch section meets the Moore Coulomb theorem and there is a maximum pile spac- ing, and it quantitatively illustrates that the vertical arch span increases with the cohesive force and angle of internal friction of soil, the change of the arch height is associated with clear distance between pile and decreases with the in- crease of pile soil load. Finally, the calculation formula is verified by an engineering example, it is concluded that the biggest pile spacing complies with that in engineering practice.

关 键 词：悬臂桩 竖直拱 摩尔库伦定理 力学分析 

分 类 号：TU473.1[建筑科学—结构工程]