| 乔木种植位置对岸坡深层锚固作用的影响——以永定河泛区为例 |
| Effect of Planting Position and Arbor Type on the Anchorage Depth of the Yongding River Floodplain Embankment |
| 投稿时间：2021-10-26 修订日期：2021-12-21 |
| DOI：10.15928/j.1674-3075.202110260365 |
| 中文关键词:生态护岸 粉质粘土 深层锚固 种植位置 拓扑指数 有限元 |
| 英文关键词:ecological revetment silty clay soil deep anchorage planting position topological index finite element |
| 基金项目:国家水体污染与治理科技重大专项（2018ZX07105-002)；水利部公益性行业科研专项（201501030）；?中国水科院创新领军人才项目（WE0145B532017)；国家自然科学基金(51809286) |
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| 中文摘要: |
| 以永定河泛区中天堂河下游段两岸作为研究区域，探究该区域的不同类型乔木种植位置对岸坡整体锚固作用的影响，确定坡地区域与坡顶区域最佳的乔木种植方案，以解决洪泛区湿陷性粉质粘土岸坡坡脚处易失稳的安全隐患。采用拓扑根系描绘法、最大摩擦锚固力计算法、经验公式模型法以及ABAQUS有限元模拟法，分别对根系的形态、根系的固土性能、根系力学特性以及锚固岸坡整体稳定性进行分析。研究结果表明：（1）由于紫荆根系具有较为发达的须根，因而紫荆具有较强的锚固性能，相较于紫荆，榆叶梅锚固性能相对较差，在同一深度的埋置条件下，二者的锚固性能相差幅度为5%~25%；（2）当坡地区域的紫荆位于坡脚处，且坡顶区域的榆叶梅位于距离坡肩1.8 m处的种植位置时，岸坡的安全系数达到2.153，岸坡的抗滑锚固效果可达到最佳。坡顶区域与坡地区域的乔木种植位置可对粉质粘土坡体稳定产生双重耦合的影响，当坡地区域植株的种植位置处于坡脚处时，坡顶处任何区域的乔木根际土体均可与之形成有效的土拱效应，以遏制岸坡失稳。 |
| 英文摘要: |
| Embankment stability is crucial for ecological restoration and embankment greening. Here, two banks of the lower Tiantang River in the Yongding River floodplain were selected for investigation. We explored the effect of arbor type and planting location on revetment effectiveness and overall embankment stability. The objective was to determine the optimal planting scheme at the top and bottom of the slope to lower the potential hazard of bank collapse due to instability at the foot of the embankment. Four methods were employed to analyze the root morphology, soil-anchor performance of the root system, root mechanical characteristics and anchored-slope stability. The methods included root morphological topology, calculated maximum frictional anchoring force, an empirical model and the ABAQUS finite-element simulation. From August 31 to October 9, 2020, research on embankment anchoring was carried out on both banks of the lower Tiantang River, and Cercis chinensis and Amygdalus triloba (10-15 m) were selected as the test arbor species. Results show that: (1) C. chinensis, with a more well-developed fibrous root system, provided stronger anchoring than A. triloba. At the same planting depth, the difference in anchoring strength was 5%-25%. (2) When C. chinensis was planted at the foot of the slope and A. triloba was planted at the top, 1.8 m from the slope shoulder, the anti-slip anchoring effect on the embankment was strongest, with a safety factor of 2.153. This study demonstrates that arbor planting positions at the top and bottom of the slope has a coupling effect that stabilizes the silty clay slope. When arbors are planted at the foot of the slope, rhizosphere soil associated with the arbor at the top produces an effective soil arching effect that stabilizes the embankment. |
| 韩纪坤,赵进勇,孟闻远,王琦,张晶,王伟杰,彭文启.2023.乔木种植位置对岸坡深层锚固作用的影响——以永定河泛区为例[J].水生态学杂志,44(2):44-53. |
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