摘要
修筑在软岩地基上的港口工程钢筋混凝土嵌岩桩,其在上部荷载作用下的荷载传递规律与软岩-混凝土界面(岩-砼界面)的力学特性息息相关,研究岩-砼界面的受力特征有利于合理评估软岩嵌岩桩的承载性能。通过开展4组饱和状态下岩-砼试件的界面剪切试验,实测得到饱和软岩-混凝土界面的剪切力-位移曲线,岩-砼界面剪切力随位移的增加呈现出“先增、后减、终平”的变化规律。基于桩侧摩阻力退化模型并结合试验实测数据回归得到了模型中的计算参数,建立了无因次化的岩-砼界面剪切力预测模型。模型预测值与试验实测值二者吻合良好,验证了模型的正确性。
The load transfer characteristics of reinforced concrete rock-socketed piles in port engineering built on soft rock foundations are closely related to the mechanical properties of soft rock-concrete interface(rock-concrete interface)under the external load.Exploring the stress characteristics of rock-concrete interface is beneficial to reasonably evaluate the bearing capacity of rock-socketed pile in soft rock.The interfacial shear tests for the four groups of rock-concrete specimens in saturated state were carried out,and the shear force-displacement curve of saturated soft rock-concrete interface was measured.The change laws for the shear force at the rock-concrete interface shows the variation characteristics of"first increase,then decrease,and finally flatten"with the increase of the displacement.Based on the degradation model of pile side friction and the tested data,the calculation parameters of the model were obtained,as well as the prediction model of normalized shear force for rock-concrete interface was established.The predicted results by the model are in good agreement with those based on experiment,validating the correctness of this paper′s proposed model.
作者
李忠芳
舒丹
王姣
粟茜洁
LI Zhong-fang;SHU Dan;WANG Jiao;SU Qian-jie(Changjiang Chongqing Harbour and Waterway Engineering Investigation and Design Institute, Chongqing 401147, China;China Design Group CO. LTD., Nanjing 210014, China;Chongqing Soil and Water Conservation Monitoring Station, Chongqing 401147, China)
出处
《水道港口》
2020年第3期336-339,共4页
Journal of Waterway and Harbor
基金
国家重点研发计划(2018YFB1600403)。
关键词
软岩
嵌岩桩
界面
剪切力
预测模型
soft rock
rock-socketed pile
interface
shear force
prediction model
