土木与环境工程学报（中英文）2024，Vol.46Issue(4)：75-81,7.DOI:10.11835/j.issn.2096-6717.2022.032
季冻黄土地区框锚边坡预应力锚杆内力计算方法
Calculation and analysis of internal forces of prestressed anchor on frame anchors supporting slope in the seasonal freeze-thaw loess area
摘要
Abstract
Due to insufficient research on interaction mechanism between freeze-thaw soil and anchor,the influence of freeze-thaw of soil on the internal force of anchor cannot be fully considered in engineering practice.Therefore,development of an empirical relationship of collapsible loess cohesion considering the influence of freeze-thaw cycles based on the triaxial shear test on collapsible loess in Xining City is essential.Based on the deformation coordination relationship between the anchor body and the surrounding soil layer,the analytical formula of the axial force and shear stress of the anchorage section of the frame prestressed anchor under freeze-thaw conditions is deduced,and the results of the theoretical calculation are compared with field tests,and the influence is analyzed.Results show that the cohesion of the soil decreases exponentially with increase of freeze-thaw cycles,and the axial force and shear stress of the anchorage section increase sharply in the first 3 cycles,and then become stable after 7 cycles.The axial force at the anchorage front section is more influenced by freeze-thaw cycles than the back end.However,the variation pattem of shear stress along the anchorage with freeze-thaw cycles is same.Results of the field tests proved the rationality of the calculation method,which can provide a reference for design and calculation of frame supporting structure in such areas.关键词
土体冻融/框锚边坡/湿陷性黄土/黏聚力/锚杆内力Key words
soil freeze-thaw/frame anchors slope/collapsible loess/cohesion/internal force of anchor分类
建筑与水利引用本文复制引用
李伟,李元勋,李辉,董勤喜,向田..季冻黄土地区框锚边坡预应力锚杆内力计算方法[J].土木与环境工程学报（中英文）,2024,46(4):75-81,7.基金项目
青海省科技厅项目(2020-ZJ-718) Qinghai Depaetment of Science and Technology Project(No.2020-ZJ-718) （2020-ZJ-718）
