Stability analysis of composite soil-nailing wall with prestressed anchors
HUI Chen-yi1, 2, ZHU Yan-peng1, 2, YE Shuai-hua1, 2
1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China
Abstract:Based on the limit equilibrium theory and the slice analysis method for the stability of soil-nailing structure, according to the assumption of parabolic slip surface for the relationship between the composite soil-nailing support structure and the stability factor of safety, using the geometric relationship and the integration method, a searching model for the most dangerous slip surface is established, and a formula for stability factor of safety is derived. The function relations between the geometrical controlling parameters of sliding surface and the stability factor of safety are deduced. The integral stability of a foundation pit with prestressed anchor composite soil nailing structure in Lanzhou is calculated by using the genetic algorithms. Finally, based on the circular sliding failure model, the stability factor of safety is compared and analyzed. The results show that the proposed method can avoid the optimization design into the local minimum value. Therefore, it is proved that this method has the calculation efficiency and certain accuracy.
[1] 朱彦鹏, 马天忠. 地震作用下复合土钉支护边坡稳定性模型及应用[J]. 兰州理工大学学报, 2009, 35(5): 112-115. (ZHU Yan-peng, MA Tian-zhong. Stability model of slope supported by composite soil nailing wall and its application under earthquake[J]. Journal of Lanzhou University of Technology, 2009, 35(5): 112-115. (in Chinese)) [2] 董 诚, 郑颖人, 陈新颖, 等. 深基坑土钉和预应力锚杆复合支护方式的探讨[J]. 岩土力学, 2009, 30(12): 3793-3796, 3802. (DONG Cheng, ZHENG Ying-ren, CHEN Xin-ying, et al. Research on composite support pattern of soil nails and prestressed anchors in deep foundation pits[J]. Rock and Soil Mechanics, 2009, 30(12): 3793-3796, 3802. (in Chinese)) [3] 汤连生, 宋明健, 廖化荣, 等. 预应力锚索复合土钉支护内力及变形分析[J]. 岩石力学与工程学报, 2008, 27(2): 410-417. (TANG Lian-sheng, SONG Ming-jian, LIAO Hua-rong, et al. Analysis of stress and deformation of prestressed anchor cable composite soil nailing[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(2): 410-417. (in Chinese)) [4] 伍 俊, 郑全平, 吴祥云. 复合土钉支护技术的有限元数值模拟及工程应用[J]. 岩土工程学报, 2005, 27(4): 388-392. (WU Jun, ZHENG Quan-ping, WU Xiang-yun. Numerical simulation in finite element and engineering application of compound soil nail support technology[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(4): 388-392. (in Chinese)) [5] 孙剑平, 魏焕卫, 江宗宝, 等. 影响复合土钉墙的变形因素的实测分析[J]. 岩土工程学报, 2010, 32(1): 430-434. (SUN Jian-ping, WEI Huan-wei, JIANG Zong-bao, et al. Factors for displacement of composite soil nailing walls[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(1): 430-434. (in Chinese)) <![CDATA[[6] 魏 屏, 杨 敏, 刘 斌. 复合土钉墙整体稳定性计算中折减系数ξ和]]><![CDATA[的研究[J]. 结构工程师, 2010, 26(4): 74-79. (WEI Ping, YANG Min, LIU Bin. Study on reduction coefficient ξ and]]><![CDATA[for base stability of composite soil-nailed walls[J]. Structural Engineers, 2010, 26(4): 74-79. (in Chinese))]]> [7] 赵德刚, 蒋 宏. 复合土钉墙的变形与稳定性分析[J]. 岩土工程学报, 2006, 28(1): 1687-1690. (ZHAO De-gang, JIANG Hong. Deformation and stability analysis of composite soil-nailed walls[J]. Chinese Journal of Geotechnical Engineering, 2006, 28(1): 1687-1690. (in Chinese)) [8] SHEN C K, HERRMANNLR, ROMSTADKM, et a1. An in site earth reinforcement lateral support system[D]. Berkeley: Davis Department of Civil Engineering, University of California, 1991. [9] 谢 强. 基于深基坑复合土钉支护受力变形的弹塑性三维有限元分析[D]. 兰州: 兰州理工大学, 2007. (XIE Qiang. 3-D Elastic一Plastic finite element analysis of on internal forces and deformation of composite soil-nailing base on deep excavation process[D]. Lanzhou: Lanzhou University of Technology, 2007. (in Chinese)) [10] 杨育文, 袁建新. 深基坑开挖中土钉支护极限平衡分析[J]. 工程勘察, 1998, 26(6): 9-15. (YANG Yu-wen, YUAN Jian-xin. Analysis of soil nailing in the excavation of deep foundation pit limit equilibrium[J]. Geotechnical Investigation & Surveying, 1998, 26(6): 9-15. (in Chinese)) [11] 贺可强, 王胜利, 阳吉宝. 运用遗传算法求解土钉支护结构的整体稳定性系数[J]. 岩土力学, 2003, 24(3): 355-358. (HE Ke-qiang, WANG Sheng-li, YANG Ji-bao. The research of genetic algorithms applied to solving coefficient of integral stability of soil-nail braced structure[J]. Rock and Soil Mechanics, 2003, 24(3): 355-358. (in Chinese)) [12] 朱彦鹏, 李 忠. 深基坑支护结构设计软件1.0[P]. 中国: 20051251,2005. (ZHU Yan-peng, LI Zhong. The software of retaining and protecting for deep foundation excavation 1.0[P]. China: 20051251,2005. (in Chinese))