浚县城墙稳定性分析与评价
2018-09-20周伟华李志敬杨华南
周伟华 李志敬 杨华南
摘要:浚县城墙大部分地段,城墙结构已遭到严重破坏。采用极限平衡分析方法(简化Bishop法,M-P法),结合实际情况,考虑自然状态工况和降雨工况(按表层1m土体饱和考虑)两种工况,分析了修复后浚县城墙的整体稳定性,进行了2种不同强度参数的参数敏感性分析。城墙稳定性分析结果表明,无论是自然状态工况还是降雨工况,采用简化Bishop法和M-P法两种计算方法搜索的最危险滑面的安全系数均大于一级边坡安全系数标准(1.30),城墙修复后是稳定的。
Abstract: The wall structure have been severely disrupted in Xun county city most of the area. Using limit equilibrium analysis method (simplified Bishop method, the M - P method), combined with the actual situation, consider the state of nature condition and rainfall conditions (according to the surface of 1 M soil saturated consider) two kinds of working condition, the overall stability of Xun county after the restoration of the wall are analyzed, the two different strength parameters sensitivity analysis of parameters is carried out. Wall stability analysis results show that the working condition of natural state and working condition of rainfall, the simplified Bishop method is adopted and the M - P method of two kinds of calculation methods to search the most dangerous sliding surface safety coefficients is greater than the standard level of slope safety factor (1.30), the wall is stable after repair.
关键词:城墙;稳定性分析;降雨工况;最危险滑面;安全系数
Key words: city wall;stability analysis;working condition of rainfall;the most dangerous sliding surface;the margin of safety
中图分类号:TU361 文献标识码:A 文章编号:1006-4311(2018)29-0252-02
0 引言
浚县城墙,始建于明洪武三年(1370年)。浚县城墙在战争中,屡遭破坏,由于长期未加保护,城墙残垣断壁逐渐被拆毁、侵占,原城门、城楼及大部分城池渐次拆除,上世纪70年代仅有西门以北沿卫河一段保存较完整。由于长期雨水冲刷、人为破坏及粗壮植物根系等因素的破坏作用,浚县城墙大部分地段,城墙结构已遭到严重破坏,具体表现为:①内侧夯土全部被挖空,仅剩外侧砖石,且部分外侧砖石已出现较严重倾斜。②城墙顶部已长满植被,由于根系的生长,顶部砖石及内侧夯土已毁坏。③部分墙体出现了贯通裂缝。
浚县城墙作为省级重点文物保护对象,应对其满目疮痍的现状进行修复加固,城墙修复前,有必要对加固墙体的稳定性进行分析与评价,以验证采取防护措施的合理性,为城墙的修复加固提供技术支持。……
