摘要
为合理评估龙门石窟擂鼓台南洞前室砌筑建筑稳定性,研究调查了南洞砌体建筑形制,查明了文物建筑病害发育现状,采用离散元数值分析方法对砌体建筑的变形和破坏机制展开研究分析,基于调查研究结果,在南洞前室砌体建筑保护工作实施过程中采用新型加固修缮技术.结果表明:建筑砌体破坏模式主要以剪切破坏为主,表现为砌体墙向临空面鼓出变形,砖拱券产生宽大的结构性贯通裂缝;降雨对砌体变形影响显著,不仅加大了结构变形量,还导致变形范围扩展;导致砌体变形的主要因素包括砌体顶部及周边填土侧向土压力、土重量的变化及土体滑动牵引作用,砌体组成材料自然劣化导致的力学强度降低,砌体承力部位支撑条件不良;明确现状洞窟处于不稳定状态,应立即采取加固和保护修缮措施;保护过程采取的加固修缮措施可有效地保证砌体建筑的稳定性.该加固修缮实践采取的技术在龙门石窟保护工作中首次采用,具有一定的创新性.
In order to assess the stability of the masonry buildings in the front of the Leigutai South Cave,a study was conducted on the architectural form and the current condition of these structures.Discrete element numerical analysis was used to investigate the deformation and failure mechanisms of the masonry buildings.Based on the findings,new reinforcement and repair techniques were applied during conservation efforts.The study reveals that shear failure is the primary mode of failure,leading to bulging deformation of the masonry wall towards the free face and the formation of wide structural penetrating cracks in the brick arches.Rainfall is found to have a significant impact on masonry deformation,increasing both the amount and extent of deformation.Factors contributing to deformation include lateral earth pressure,changes in soil weight,soil sliding traction,reduced mechanical strength from natural degradation of masonry materials,and poor support conditions at the load-bearing parts of the masonry.It is evident that the cave is currently unstable,necessitating immediate reinforcement and protection measures.The measures implemented during conservation efforts have proven to be effective in ensuring stability.The technology used in the reinforcement work represents a novel approach in the protection of Longmen Grottoes,demonstrating a certain degree of innovation.
作者
李心坚
卫婉英
刘轶
张芳琳
LI Xinjian;WEI Wanying;LIU Yi;ZHANG Fanglin(Longmen Grottoes Academy,Henan Luoyang 471023,China)
出处
《西安建筑科技大学学报（自然科学版）》
北大核心
2024年第5期782-790,共9页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家自然科学基金(32370105)
国家重点研发计划项目(2021YFC1523400)
河南兴文化工程文化研究专项项目(2022XWH119)
2023年度河南省重点研发专项(231111321100)。
关键词
龙门石窟
古建筑
砖石砌体
离散元分析
加固修缮方法
Longmen grottoes
ancient architecture
masonry structure
discrete element analysis
reinforcement and repair methods
