石砌体材料力学性能研究——以湘粤古驿道石拱桥为例  

Study on Mechanical Properties of Stone Masonry Materials--Taking the Stone Arch Bridge of Ancient Post Road in Hunan and Guangdong as an Example

作　　者：申抚兵 韩汤益 SHEN Fubing;HAN Tangyi(Municipal Engineering Northwest Design and Research Institute Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《河南科技》2024年第5期59-62,共4页Henan Science and Technology

基　　金：结构抗风与振动控制湖南省重点实验室“钢-UHPC组合桥面板横向抗弯性能与设计研究”(E22340)。

摘　　要：【目的】以湘粤古驿道石拱桥——万岁桥为背景,进行相关室内试验、数据拟合分析研究,为明确石砌体材料的力学性能,尤其是压剪力学性能,以及老旧石拱桥承载力的准确评估提供参考和依据。【方法】参考实桥选择当地普通石灰岩石,制作原石、砌缝砂浆、石砌体等三类试件,进行轴心抗压、压剪试验研究。通过数据比对、归纳总结、拟合分析等方式研究砌缝厚度、侧压力等参数对石砌体材料力学性能的影响规律。【结果】原石抗压性能存在一定的离散性,可能是所用的石材内部存在缝隙、节理等;砌缝厚度、侧压力对石砌体试件的抗压性能、抗剪强度有较大影响,砌缝厚度越小抗压强度越高,侧压力越大抗剪承载力越高。【结论】侧压力是影响石砌体抗剪强度的重要因素,两者呈正相关,且符合摩尔库-伦理论特征,其数学关系可以通过数据拟合的方式进行确定。[Purposes]Based on the stone arch bridge of Xiangyue Ancient Post Road—Wansui Bridge,relevant indoor tests and data fitting analysis were carried out to provide reference and basis for clarifying the mechanical properties of stone masonry materials,especially the compressive and shear mechanical properties,as well as the accurate evaluation of the bearing capacity of old stone arch bridges.[Methods]Referring to the actual bridge and selecting local ordinary limestone,three types of specimens were made,including raw stone,joint mortar,and stone masonry,and axial compressive and shear tests were conducted;Through data comparison,summary and fitting analysis,the influence of joint thickness,lateral pressure and other parameters on the Strength of materials performance of stone masonry is studied.[Findings]There is a certain degree of dispersion in the compressive performance of the raw stone,which may be due to the presence of gaps,joints,etc.inside the stone used;the thickness of masonry joints and lateral pressure has a significant impact on the compressive performance and shear strength of stone masonry specimens,which shows that the smaller the thickness of masonry joints,the higher the compressive strength,and the greater the lateral pressure,the higher the shear bearing capacity.[Conclusions]Lateral pressure is an important factor that affects the shear strength of stone masonry.The two have a positive linear relationship and comply with the characteristics of Mohr-Coulomb theory.Its mathematical relationship can be determined through data fitting.

关 键 词：桥梁工程 石拱桥 石砌体 压剪性能 单轴抗压 

分 类 号：U411[交通运输工程—道路与铁道工程]