摘要
为探明岩质边坡锚索的抗拉拔位移特征及建立锚索极限承载力预测模型,结合陕西镇安某边坡治理工程实例,通过现场试验和回归拟合法对锚索位移特征与锚固长度等因素间关系、锚索极限承载力预测等进行了研究。结果表明,锚固长度过长或过短均不利于锚索的抗拉拔位移量降低,锚索的锚固长度存在最佳值,依托工程边坡锚索的最佳锚固长度约为18 m。随着加载循环次数增加,锚索的荷载-位移关系曲线由线性转化为非线性变化,且其弹性位移增量均大于塑性位移增量,初始加载循环条件的位移增量最大。基于回归拟合方法建立了锚索极限承载力预测模型,预测精度达95%,其对类似边坡治理工程具有借鉴意义。
In this paper,based on an example of a slope management project in Zhen’an,Shaanxi Province,it has analysed the relation between the anchor displacement and anchorage length and other factors,the ultimate bearing capacity of the anchor cable,through the field test and regression fitting method,which is to explore the tensile and pullout displacement characteristics and the prediction model of the ultimate load carrying capacity of anchor cables on rocky slopes.The results show that it is not conducive to the reduction of its resistance to pullout displacement as the anchorage length of the anchor cable is too long or too short,and has the optimal anchorage length,depending on the optimal length of the project slope is about 18 m.With the increase in the number of loading cycles,the load-displacement relation curves of the anchor cable is transformed from linear to nonlinear changes,and the elastic displacement is larger than the plastic displacement,and with the largest displacement increments for the initial loading cycle condition.A prediction model of the ultimate bearing capacity of the anchor cable has been established by polynomial regression fitting method,with a prediction accuracy of 95%,which is of reference significance for similar slope management projects.
作者
郭瑞
张建华
杨东
牟岩
武嘉浩
GUO Rui;ZHANG Jianhua;YANG Dong;MU Yan;WU Jiahao(School of Civil Engineering and Architecture,Shaanxi University of Technology,Hanzhong 723000,China;China Southwest Geotechnical Investigation&Design Institute Ltd Co.,Chengdu 610052,China)
出处
《陕西理工大学学报(自然科学版)》
2025年第3期95-101,共7页
Journal of Shaanxi University of Technology:Natural Science Edition
基金
陕西省交通运输厅交通科研项目(HNZB-CG24114)。
关键词
岩质边坡锚索
现场拉拔试验
位移特征
极限承载力
rocky slope anchors
on-site pull-out test
displacement characteristics
ultimate carrying capacity
作者简介
通信作者:郭瑞,男,博士,副教授。
