| The slope protection with vegetation and micro-piles has been widely used in dealing with actual slope reinforcement and protection. The safety factor of stability of slope is one of the main basis for quantitative evaluation of slope stability. Its accurate calculation is of great significance for the prevention of landslide. The slope protection with vegetation and micro-piles not only can soil fixation and water conservation, but also can enhance bearing capacity of slope. this article uses actual outside test combined with finite element software ADINA simulation. By the comparison of safety factor of slope protection with vegetation and micro-piles and the results from finite element software simulation,Provide a theoretical basis for the design of slope protection engineering.By the combination between traditional method of calculating the safety factor of slope and Modern finite element software ADINA, soil with root, soil without root and the influence of micro pile on safety factor of slope stability is analyzed. Meanwhile, under the concrete model similar to practical engineering, the effect of the slope protection with vegetation and micro-piles in rainfall conditions is measured through strain gauge, strain gage, Micro-earth pressure cell. According to the experimental data, the force characteristics of the micro pile are analyzed. Afterwards, the simulation results from the finite element software and the experimental data are in accordance with the general law. The main conclusions of this paper are as follows:(1) Traditional method for calculating safety factor of slope stability is utilized to verify that modern finite element software ADINA for the calculation of slope stability safety factor has some reliability. According to the ADINA calculation of safety factor of slope stability in soil with root, soil without root and soil with micro pile and root, the results demonstrates that the slope protection with vegetation and micro-piles can effectively improve the safety factor of the slope stability. Furthermore, the synergistic effect of slope protection is more obvious.(2) Specific model experiments show that plant cover can well prevent the erosion of rain water and keep the soil and water stable. The root system can significantly enhance the shear strength of the soil and improve the stability of the slope.(3) In the process of continuous loading of concrete model, datas from strain gauge demonstrate that micro pile can effectively resist the load applied on the top. According to ADINA finite element analysis of slope with micro pile, mechanics laws and characteristics of soil stress on slope are very great agreement with the model test results. Under the load, the mechanical characteristics of the micro-pile is that thrust force gradually decreases from the top down and the force of single pile is mainly distributed in the middle part; The force of the same row piles are basically equal; besides, The force of upper pile is greater than the force of row piles; The force of soil slope is gradually reduced from top to bottom. Main load on the top are mainly supported by the micro-pile upper soil. |
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