Email Alerts
RSS
Influence factors analysis of soil nailing support slope
-
摘要: 为了分析土钉支护参数对边坡稳定性的影响，基于室内土工试验，建立了边坡坡角为60°的模型，试验研究了荷载作用下，土钉长度、土钉倾角、土钉数量、土钉位置等4种参数对边坡坡顶沉降、边坡滑坡模式的影响。结果表明：土钉在坡中位置时，随着土钉长度的增加，边坡的稳定性增加，但是当土钉在坡顶和坡脚位置时，土钉长度对边坡稳定性影响较小；随着土钉倾角的增大，边坡稳定性呈先增后降的趋势，土钉倾角为50°时边坡稳定性最好；土钉数量减少，边坡稳定性明显降低；土钉在边坡的位置对支护效果影响较大，当土钉处于坡中位置时，边坡极限承载力最大，沉降与荷载曲线呈线性关系，表现出“渐进性”破坏。通过计算分析发现，土钉处于坡中位置时边坡的安全系数最大，比较试验与数值模拟结果也证明了土钉在坡中位置对边坡的稳定性影响最大。Abstract: In order to analyze the influences of the soil nailing parameters on the stability of the slope, a slope model with an angle of 60° was established for indoor geotechnical testing. A series of experiments were carried out to analyze how the patterns of the settlement of the slope top and slope landslide were affected by four factors including the length, the angle, the number and the positions of the soil nailing. The simulation with analysis results shows that the stability of the slope increases with the increasing soil nailing length when the soil nailing is placed in the middle of the slope, but the length of the soil nailing has less influences on the stability of the slope whether the soil nailing is placed at the top or the foot of the slope. The slope stability increases firstly and then decreases with the increase of the angle of the soil nailing, and the slope stability achieves its best view when the angle of the soil nailing is 50°. With the number of the soil nailing decreases, the slope stability would drop obviously. The positions of the soil nailing on the slope have a significant influence on the support effect of the soil nailing. When the soil nailing is in the middle position of the slope, the ultimate bearing capacity of the soil nailing attains its largest, and the slope settlement is linearly proportional to the load, and the distortion of the slope appears to be "progressively" damaged. From calculation and analysis it is found that when the soil nail is located in the slope, the safety factor of the slope is the largest. Comparing the experiments with numerical simulation results, it is proved that the soil nailing placed at the middle of the slope has the greatest influences on the slope stability.
-
Key words:
- soil nailing /
- support parameters /
- slope /
- ultimate bearing capacity /
- safety factor
-
图 4 9根土钉位于坡中(锚固角50°)加载及破坏过程
Figure 4. Loading and damaging process of slope placed with nine soil nails at middle of slope (anchor angle 50°)
图 5 9根长土钉不同设计角度下边坡沉降变形与载荷曲线
Figure 5. Settlement deformation and load curves of slope under different soil nailing design angles of nine long soil nails
图 6 土钉位置不同的边坡变形与荷载曲线
Figure 6. Deformation and load curves of slope with soil nailing at different positions
图 7 使用长短土钉时边坡的沉降变形与荷载曲线
Figure 7. Settlement deformation and load curves of slope with long and short soil nailing
图 8 土钉数量对边坡沉降变形与荷载影响曲线
Figure 8. Curves of influence of soil nailing quantity on slope settlement deformation and loads
-
[1] ZHANG Mingju, SONG Erxiang, CHEN Zhaoyuan, et al. Ground movement analysis of soil nailing construction by three-dimensional (3-D) finite element modeling (FEM)[J]. Computers and Geotechnics, 1999, 25(4): 191-204. doi: 10.1016/S0266-352X(99)00025-7 [2] BRIDLE R J. Soil nailing-analysis and design[J]. Internal Journal of Rock Mechanics & Mining Science & Geomechanics Abstracts, 1989, 27(2):A103. http://trid.trb.org/view/313296 [3] 杨光华.深基坑开挖中多支撑支护结构的土压力问题[J].岩土工程学报, 1998, 20(6): 113-115. doi: 10.3321/j.issn:1000-4548.1998.06.026 YANG Guanghua. The earth pressure problems for the multi-braced retaining structure of deep foundation pit[J]. Chinese Journal of Geotechnical Engineering, 1998, 20(6): 113-115. (in Chinese) doi: 10.3321/j.issn:1000-4548.1998.06.026 [4] 杨光华, 黄宏伟.基坑支护土钉力的简化增量计算法[J].岩土力学, 2004, 25(1): 15-19. doi: 10.3969/j.issn.1000-7598.2004.01.004 YANG Guanghua, HUANG Hongwei. Simplified incremental calculation method of soil nailing forces for retaining and protection of foundation pits culverts[J]. Rock and Soil Mechanics, 2004, 25(1): 15-19. (in Chinese) doi: 10.3969/j.issn.1000-7598.2004.01.004 [5] 潘龙, 王建国.土钉支护的能量法稳定分析[J].合肥工业大学学报, 2011, 34(5): 734-738. doi: 10.3969/j.issn.1003-5060.2011.05.022 PAN Long, WANG Jianguo. Stability analysis of soil nailing structures using energy method[J]. Journal of Hefei University of Technology, 2011, 34(5): 734-738. (in Chinese) doi: 10.3969/j.issn.1003-5060.2011.05.022 [6] SHEN C K, BANG S, ROMSTAD K M, et al. Field measurement of an earth support system[J]. Journal Geotechnical Engineering, ASCE, 1981, 107(12): 1625-1642. [7] 张鑫, 宋二祥.土钉支护技术现场测试及有限元分析[J].工业建筑, 1997, 27(11): 14-17. doi: 10.3321/j.issn:1000-8993.1997.11.004 ZHANG Xin, SONG Erxiang. Study on field test and finite element analysis of soil nailing technology[J]. Industrial Architecture, 1997, 27(11): 14-17. (in Chinese) doi: 10.3321/j.issn:1000-8993.1997.11.004 [8] 张明聚, 郭忠贤.土钉支护工作性能的现场测试研究[J].岩土工程学报, 2001, 23(3): 319-323. doi: 10.3321/j.issn:1000-4548.2001.03.013 ZHANG Mingju, GUO Zhongxian. Research on behaviors of soil nailing by field test[J]. Chinese Journal of Geotechnical Engineering, 2001, 23(3): 319-323. (in Chinese) doi: 10.3321/j.issn:1000-4548.2001.03.013 [9] 段建立, 谭跃虎, 樊有维, 等.复合土钉支护的现场测试研究[J].岩石力学与工程学报, 2004, 23(12): 2128-2132. doi: 10.3321/j.issn:1000-6915.2004.12.035 DUAN Jianli, TAN Yuehu, FAN Youwei, et al. Field testing study on composite soil nailing[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23(12): 2128-2132. (in Chinese) doi: 10.3321/j.issn:1000-6915.2004.12.035 [10] 吴九江, 程谦恭, 孟祥龙.黄土高边坡土钉-预加固桩复合支护体系性状分析[J].岩土力学, 2014, 35(7): 2029-2040. http://d.old.wanfangdata.com.cn/Periodical/ytlx201407034 WU Jiujiang, CHEN Qiangong, MENG Xianglong. Behavior of a high steep loess slope strengthened by combination system of soil nails and stabilization piles[J]. Rock and Soil Mechanics, 2014, 35(7): 2029-2040. (in Chinese) http://d.old.wanfangdata.com.cn/Periodical/ytlx201407034 [11] 莫暖娇, 何之民, 陈利洲.土钉墙模型试验分析[J].上海地质, 1999, 71(3): 47-49. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK199900575385 MO Nuanjiao, HE Zhimin, CHEN Lizhou. Model test analysis of the soil nailing wall[J]. Shanghai Geology, 1999, 71(3): 47-49. (in Chinese) http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=QK199900575385 [12] 王丽萍, 张嘎, 张建民, 等.土钉加固黏性土坡动力离心模型试验研究[J].岩石力学与工程学报, 2009, 28(6): 1226-1230. doi: 10.3321/j.issn:1000-6915.2009.06.019 WANG Liping, ZHANG Ga, ZHANG Jianmin, et al. Dynamic centrifuge modeling test of cohesive soil slopes reinforced with soil nailing[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(6): 1226-1230. (in Chinese) doi: 10.3321/j.issn:1000-6915.2009.06.019 -
下载:
点击查看大图
图(9)
计量
- 文章访问数: 664
- HTML全文浏览量: 17
- PDF下载量: 241
- 被引次数: 0
