(1 湖州职业技术学院建筑工程学院, 湖州 313000; 2 湖州市绿色建筑技术重点实验室, 湖州 313000;3 浙江力丰建筑加固有限公司, 湖州 313000; 4 东南大学土木工程学院, 南京 211189)

摘要: 南京古城墙文物价值非凡,滑坡是古城墙的典型损伤,对包山式城墙危害巨大. 以狮子山段城墙历史滑坡勘察资料为背景,对砖砌体与土体的复合结构进行分析并适当简化. 采用 GEO⁃SLOPE 软件中的瑞典法、简化Bishop 法、Janbu 法、Spencer 四种极限平衡分析方法,对考虑自然情况、不同浸润深度、施加锚杆三种工况下的土坡稳定性进行分析. 结果表明:各种方法对浸润深度的敏感程度很接近,评价土坡稳定性时以简化 Bishop 法得出的结果最安全;对于常见浸润深度 2~ 4m,四种方法所得边坡安全系数为 1. 5 ~ 1. 6;增加锚固长度比增加锚杆预加力对提高边坡安全系数效果更为明显.

关键词: 包山式城墙; 稳定性分析; 滑坡; 极限平衡法; 浸润深度

中图分类号:TU471 文献标志码:A 文章编号:1002⁃848X(2022)16⁃0132⁃05

DOI:10. 19701 / j. jzjg. LS210020

Stability analysis of the soil slope of ancient city wall surrounded by mountains

HU Jian1,2, WANG Fang1,2, ZHU Lei3, MU Baogang4

(1 School of Architecture and Engineering, Huzhou Vocational and Technical College, Huzhou 313000, China; 2 HuzhouKey Laboratory of Green Building Technology, Huzhou 313000, China; 3 Zhejiang Lifeng Building Reinforcement Co., Ltd.,Huzhou 313000, China; 4 School of Civil Engineering, Southeast University, Nanjing 211189, China)

Abstract: The cultural relics of the ancient city wall in Nanjing are of great value, and landslides are typical damages tothe ancient city walls and cause great harm to the city wall surrounded by mountains. Based on the historical landslidesurvey data of the Shizishan section of the city wall, the composite structure of brick masonry and soil was analyzed andappropriately simplified. Using four limit equilibrium analysis methods in GEO⁃SLOPE software, namely Swedish method,simplified Bishop method, Janbu method and Spencer method, the soil slope stability under three conditions of consideringnatural conditions, different infiltration depths and applying anchors was analyzed. The results show that the sensitivity ofvarious methods to the infiltration depth is very close, and the result obtained by the simplified Bishop method is the safestto evaluate the stability of soil slopes. For the common infiltration depth of 2~ 4m, the safety factor of the slope obtained bythe four methods is 1. 5~ 1. 6. Increasing the anchorage length is more effective in improving the safety factor of the slopethan increasing the prestressing force of the anchor bolt.

Keywords:city wall surrounded by mountain; stability analysis; landslide; limit equilibrium method; infiltration depth

∗湖州市科技计划项目(2020YZ07),浙江省基础公益研究计划项目(LGF22D020002),浙江省 2020 年度高校访问工程师校企合作项目(FG2020167).

第一作者:胡健,硕士,讲师,主要从事边坡工程、软基处理等方向的研究,Email:493268163@ qq. com.

[引用本文] 胡健,王芳,朱磊,等. 包山式古城墙土坡稳定性分析 [ J]. 建筑结构,2022,52(16):132⁃136. HUJian,WANG Fang,ZHU Lei,et al. Stability analysis of the soil slope of ancient city wall surrounded by mountains[ J].Building Structure,2022,52(16):132⁃136.