| 摘要: |
| 在台风和寒潮等极端事件条件下海堤背水坡易受到越浪和溢流的侵蚀作用，海堤背水坡的保护越来越受到重视；同时人们对海岸工程也提出了更多的生态和景观要求。加筋草皮作为一种新兴的护坡方式，发挥了土工织物防冲固草和草根系固土的作用，既提高了植被护坡的抗水力侵蚀能力，也满足生态功能。为研究背水坡加筋草皮的护坡性能，基于室内水槽试验，探究了不同加筋草皮方式在背水坡遭受高速持续水流冲刷和越浪水体斜向冲刷两种作用下抗侵蚀性能。试验结果表明：不同方式的加筋草皮抗侵蚀有差异，抗侵蚀性能由强到弱为三维土工网垫与土工格栅联合加筋、三维土工网垫＞土工格栅＞天然草皮。相同流量下卷破波斜向冲刷作用下较持续水流正向冲刷破坏更为强烈。 |
| 关键词: 护坡 抗冲蚀能力 加筋草皮 背水坡 越浪 土工织物 |
| DOI： |
| 分类号:TV871 |
| 基金项目:国家自然科学基金资助项目（51309092）；江苏省自然科学基金资助项目（BK20130833） |
|
| Experimental studies on scouring resistance of reinforced turf on land-side slope |
|
HU Yu-zhi1,2, PAN Yi1,2, CHEN Yong-ping1,2
|
|
1.State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering, Hohai University, Nanjing;2.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing
|
| Abstract: |
| The land-side slope of a sea embankment would suffer from erosion induced by overtopping and overflow when extreme events such as typhoon and cold wave happen. Previous studies have shown that the protection of the land-side slope of the earthen levees against wave and surge overtopping during large storm surges is of great importance. Recently more attentions have been paid by engineers and researchers to the land-side slope protection. Different types of strengthening systems were introduced to protect the crest and land-side slope of the levees against surge overflow and wave overtopping after Hurricane Katrina. Meanwhile ecological and landscape requirements were put up for coastal engineering construction. As an innovative side slope protection way, reinforced turf has the advantages of fixing the plants, which in turn fix the soil. The reinforced turf protection can strengthen the erosion resistance and meet the requirements of ecological function as well. The scouring resistance of the land-side slope protected by different types of the reinforced turf under high velocity flow parallel to the land-side slope as well as oblique to the land-side slope was investigated by using flume experiments. The samples with different strengthening methods were tested under high speed open flow. After the tests, the erosion of the turf samples was measured. The depths of the erosion of the samples were plotted versus the rates of discharge. Experiment results show that scouring resistance of different types of the reinforced turf are not the same. The reinforcement effects of combined geogrid and three-dimensional geomats are better than those of the geogrid and natural turf. Comparisons are also made between the erosion resistances against the scouring of parallel flow and oblique flow. Scouring oblique to the land-side slope causes worse damage than parallel scouring to the land-side slope under the same flow discharge rate. |
| Key words: slope protection erosion resistance reinforced turf land side slope overtopping geotextiles |
