南京九华山段城墙内部人防工事破坏机理及加固  

Destruction Mechanism and Reinforcement of the Civil Air Defense Fortifications Inside City Wall of Mount Jiuhua in Nanjing

作　　者：王志强 穆保岗[1] Wang Zhiqiang;Mu Baogang(School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学土木工程学院,南京211189

出　　处：《特种结构》2022年第3期40-46,共7页Special Structures

基　　金：江苏省文旅厅2021年度文物科研课题(2020SK14)。

摘　　要：南京城墙内部现存大量陈旧人防工事,极易发生坍塌导致城墙破坏。为研究城墙与人防工事相互作用关系及人防工事加固措施,本文以九华山段城墙为例,采用理论分析、数值模拟、现场监测的方法,分析了人防工事开挖和衬砌劣化工况下城墙外包砌体的位移曲线和衬砌应力变化情况,探讨了人防工事加固方案。研究结果表明:人防工事衬砌拱顶压力受到墙芯力学性能和洞室尺寸的影响;同人防工事开挖相比,砖衬砌性能劣化会导致城墙水平位移增加1~2倍,底板隆起量增加0.51倍,拱顶下沉量增加0.77倍;锚喷支护+注浆+砖墙支承的加固方案是合理有效的,施工过程中城墙最大水平位移为0.3mm,实现对城墙和人防工事变形的控制。The spare and deserted civil air defense facilities inside Nanjing ancient city wall increase the risk of structure failure and eventually lead to collapse.This study sought to reveal the relationship between the structure of civil air defense facilities and the stability of ancient city wall,and to propose a potentially reliable scheme for the reinforcement of masonry structures.Theoretical analysis,numerical simulation,and in-situ mo-nitoring were applied to the ancient wall near Jiuhua mountain.Two conditions of civil air defense cavern exca-vation and lining degradation were simulated,and the curves of displacement of outer masonry and the variation of lining stress were compared and analyzed.Finally,A strengthening measure was proposed to keep the safety of city wall.The results show that the arch crown pressure of civil air defense facilities lining is affected by the mechanical properties of wall core and cavern size.Compared with the excavation of civil air defense facilities,the deterioration of brick lining performance increases the horizontal displacement of the city wall by 1~2 times,the uplift of the bottom plate by 0.51 times and the subsidence of the arch crown by 0.77 times.The re-inforcement scheme using bolt shotcrete support,grouting and brick wall support is reasonable and effective.By monitoring,the maximum horizontal displacement of the city wall during construction was 0.3mm,the deforma-tion of the city wall and civil defense facilities was controlled.

关 键 词：南京城墙 人防工事 数值模拟 加固方案 

分 类 号：TU746.3[建筑科学—建筑技术科学]