摘要
基于上限法、平面刚架理论与弹性地基梁理论,对双排桩加固边坡中结构变形进行解析,通过数值模拟验证所提方法的合理性,研究了影响双排桩桩身位移的6个因素。结果表明:当连系梁厚度/桩径小于0.7、嵌固段与受荷段长度之比小于0.8、桩径小于1.0左右时,对桩身位移影响较大,且呈现出明显的非线性特征;桩身弹性模量对双排桩桩身位移同样具有较大影响,但表现出近似线性的特征。对于双排桩加固边坡,为有效控制边坡变形,可适当增大连系梁厚度、嵌固段长度、桩径、桩身弹性模量或联合注浆改善桩周岩土体的力学性能。研究结果可为边坡中双排桩的设计提供参考。
Based on the upper limit method,the plane rigid frame model and beam-on-elastic-foundation model,the deformation of the structure in the slope reinforced by double-row piles was analyzed;the rationality of the proposed method was verified by numerical simulation,and then the six factors affecting the displacement of the double-row piles were studied using the proposed theoretical calculation method.Results show that the displacement of double-row piles is greatly affected when the ratio of the thickness of connecting beam to the pile diameter is less than 0.7,the ratio of embedded length to loaded length is less than 0.8,and the pile diameter is less than 1.0,and it shows obvious nonlinear characteristics;it is also significantly affected by the elastic modulus of the pile,but it shows a nearly linear characteristic.For the slope reinforced with double-row piles,the thickness of the connecting beam,length of the embedded section,pile diameter,elastic modulus of the pile body can be appropriately increased,or the measures,such as grouting,to improve the mechanical properties of rock and soil around the piles can be taken.The research results can provide references for similar projects.
作者
曾锦秀
ZENG Jinxiu(School of Civil Engineering,Fujian Chuanzheng Communications College,Fuzhou 350007,China;Transportation and Civil Engineering Intelligence and Green Construction Application Technology Collaborative Innovation Center in Fujian Province,Fujian Chuanzheng Communications College,Fuzhou 350007,China)
出处
《福建工程学院学报》
CAS
2021年第6期538-544,共7页
Journal of Fujian University of Technology
关键词
边坡
双排桩
极限分析
平面刚架
弹性地基梁
slope
double-row piles
limit analysis
plane rigid frame
beam-on-elastic-foundation
