PIANC Smart Rivers 2022

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River bank collapse frequently occurs in rivers. In order to protect the river bank and stabilize the river situation, a large number of hard revetments have been applied to the river bank collapse zone in the past. However, the rigid bank protection structure is not conducive to the sustainable development of the ecological environment. Therefore, the vegetation-covered bank protection has become an important measure for modern ecological river management. In order to evaluate the stability of the vegetation-covered ecological bank slope and guide the design and application of the ecological bank protection project. In this paper, the finite element method based on the principle of strength reduction is adopted, and the stability of the bank slope is calculated by taking into account the reinforcement effect of the vegetation root system on the soil. For herbaceous vegetation, the root tensile strength is small but the distribution is relatively dense, so the root-containing area of the bank slope is treated as a root-soil complex. For arbor and shrub vegetation, the tensile strength of the root system is relatively large, and the relative distribution range is wide and sparse. Therefore, the root system of the arbor and shrub is considered as the anchor rod structure. At the same time, the hydrostatic pressure in the river channel and the pore water pressure caused by the seepage of the water body were also considered when calculating the stability of the bank slope. The results show that herb vegetation has better stabilization effect on shallow bank slope, while tree and shrub vegetation has better overall stabilization effect on bank slope. Moreover, the protective effects of vegetation distributed on the bank slope and bank top are quite different.

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