Performance test and stability analysis of jute planting bag on subgrade slope
LIU Kunjue1, LIU Wen2, LIU Mingxi2, FAN Xu1
1. Yunnan Construction Investment Holding Group Co., Ltd., 650000 Kunming, China; 2. School of Soil and Water Conservation, Beijing Forestry University, 100083 Beijing, China
Abstract：[Background] In the process of engineering construction, soil erosion often occurs, which affects the stability of the slope. Soil and water conservation slope protection project is important for restoring and building a good ecological environment. The plant bag made of natural jute has outstanding environmental protection and economy. The jute fiber can provide nutrients for plants after decomposition. There are few studies on the stability analysis of the bag itself, and the planting bag itself is more prone to be damaged under heavy rainfall. Therefore, the stability analysis is crucial. [Methods] In order to explore the basic physical and mechanical properties of jute planting bag and its stability in practical engineering, the physical and mechanical properties of density, tension and tear of common jute cloth materials for planting bag were tested. Based on the basic assumptions, the stabilities of jute planting bags under natural conditions and heavy rainfall conditions were calculated according to the force balance method and the conditions of subgrade slope, and the evaluation method of bag stability was proposed by calculating the stability coefficient. [Results] 1) The average tensile strength of the two types of jute cloth were 14.7kN/m and 22.2kN/m, the average elongation at break were 6.1% and 10.7%, and the average tearing strength were 0.35kN/m and 0.56kN/m, respectively. The basic performance met the performance requirements of national standards for planting bags. 2) Under the condition of force equilibrium, the stability coefficient of jute planting bags under natural conditions was 1.51, thus the stability of jute planting bags on the subgrade slope was good. The stability coefficient was 0.52 under the saturated condition of heavy rainfall, which was insufficient. 3) The jute planting bags were reinforced by anchor mesh. The pull-out safety coefficient of the anchor was 1.58, therefore the jute planting bags were of good stability. [Conclusions] The basic performance of jute cloth meets the performance requirements of national standards for planting bags. Under the saturated condition of heavy rainfall, the stability of jute planting bag is insufficient, and reinforcement methods should be adopted. Based on the pullout stability of anchor rod, the stability evaluation method of jute planting bags reinforced by anchor mesh is established. Combined with examples, it is proved that anchor mesh is very effective to enhance the stability of jute planting bags on subgrade slope.
刘昆珏, 刘问, 刘明西, 樊旭. 路基边坡黄麻植生袋的性能测试与稳定性分析[J]. 中国水土保持科学, 2022, 20(6): 67-73.
LIU Kunjue, LIU Wen, LIU Mingxi, FAN Xu. Performance test and stability analysis of jute planting bag on subgrade slope. SSWC, 2022, 20(6): 67-73.
田达鹏. 植生袋绿化技术在高速公路粉土路集中的应用技术要点[J]. 交通世界, 2017,23(22): 164. TIAN Dapeng. The main points of application technology of planting greening technology in the silt road concentration of expressway[J]. Transportation World, 2017, 23(22): 164.
[4]
鲁明星, 谷岩. 植生袋复垦边坡在降雨入渗条件下的稳定性[J]. 金属矿山, 2013, 48(2): 122. LU Mingxing, GU Yan. The stability of planting bags reclamation slope under rainfall infiltration conditions [J]. Metal Mine, 2013, 48(2): 122.
[5]
王中珍, 冯洪成, 丁帅, 等. 可降解黄麻护坡复合植生材料的研究开发[J]. 山东纺织科技, 2017, 59(1): 13. WANG Zhongzhen, FENG Hongcheng, DING Shuai, et al. Research and development of degradable jute slope protection composite planting materials[J]. Shandong Textile Science and Technology, 2017, 59(1): 13.
[6]
陆程铭, 蔡海艇, 徐文杰. 一种新型的软体结构在边坡防护中的应用[J]. 上海水务, 2008, 24(4): 46. LU Chengming, CAI Haiting, XU Wenjie. Application of a new type of soft structure in slope protection [J]. Shanghai Water Affairs, 2008, 24(4): 46.
[7]
石永超, 张琳琳, 翟晶. 生态袋护岸的设计要点探讨[J]. 城市道桥与防洪, 2020,36(10): 108. SHI Yongchao, ZHANG Linlin, ZHAI Jing. Discussion on the design points of ecological bag revetment[J]. Urban Roads Bridges and Flood Control, 2020,36(10): 108.
[8]
姚裕春, 姚令侃, 袁碧玉. 降雨条件下边坡破坏机理离心模型研究[J]. 中国铁道科学, 2004,25(4): 65. YAO Yuchun, YAO Lingkan, YUAN Biyu. Research on centrifugal model of slope failure mechanism under rainfall conditions [J]. China Railway Science, 2004,25(4): 65.
[9]
黄波, 吴平, 万燎榕, 等. 降雨条件下土工袋护坡抗冲刷试验研究[J]. 中国农村水利水电, 2021,62(5): 74. HUANG Bo, WU Ping, WAN Liaorong, et al. Experimental research on the anti-erosion performance of the slope protection using soilbags under rainfall conditions[J]. China Rural Water and Hydropower, 2021,62(5): 74.
[10]
陈善雄,陈守义.考虑降雨的非饱和土边坡稳定性分析方法[J].岩土力学,2001,23(4):447. CHEN Shanxiong, CHEN Shouyi. Stability analysis method of unsaturated soil slope considering rainfall[J]. Rock and Soil Mechanics, 2001,23(4): 447.
[11]
吴苏舒, 张玮, 袁和平. 不同部位护底混凝土联锁排稳定特性研究[J]. 水运工程, 2008,33(11): 53. WU Sushu, ZHANG Wei, YUAN Heping. Research on stability characteristics of concrete interlocking row of bottom protection with different parts [J]. Water Transport Engineering, 2008,33(11): 53.
[12]
隋明昊. 岩质高陡边坡锚杆:土工网垫喷播植草生态护坡结构稳定性研究[D]. 山东青岛: 青岛理工大学, 2012:24. SUI Minghao. Stability research of high steep rock slope by anchor—geomat spraying ecological slope protection structure[D]. Qingdao, Shandong: Qingdao Technological University, 2012:24.
[13]
王艳巧, 刘斯宏, 杨俊杰,等. 土工袋加固砂性土质边坡模型试验与上限解[J]. 岩石力学与工程学报, 2009, 28(S2): 4006. WANG Yanqiao, LIU Sihong, YANG Junjie, et al. Model test and upper limit solution of sandy soil slope reinforced by geotechnical bag[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(S2): 4006.
2022, Vol. 20 
