| 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。 |
| 关键词: 土钉 支护参数 边坡 极限承载力 安全系数 |
| DOI： |
| 分类号:TU413.6+2 |
| 基金项目:国家自然科学基金资助项目(11102205， 41272251)； 合肥工业大学青年基金资助项目（2013HGQC） |
|
| Influence factors analysis of soil nailing support slope |
|
LI Guoqing, MA Haichun, CUI Kerui, QIAN Jiazhong
|
|
College of Resources and Environment Engineering, Hefei University of Technology, Hefei
|
| 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 |
