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Optimization and evaluation of mechanical parameters of curtain grouting materials in deep water rich karst tunnel

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Document pages: 12 pages

Abstract: During the construction of deep buried karst tunnel, mud and water inrush often occur, resulting in serious accidents and heavy economic losses. Therefore, for tunnels in deep water rich areas, how to effectively control water inflow and ensure the stability of surrounding rock has a significant impact on the safety of engineering construction. The case study of this paper simulates the water rich section of doumo tunnel from Shanghai to Kunming, China. Numerical analysis is used to simulate the construction of curtain grouting section and evaluate the effect of various curtain grouting parameters. Select the best grouting parameters and apply them to the grouting method for evaluation. The results show that: (1) the model has good stabilitygrouting effect is the most notable one when the thickness of the grouting circle is outside the 4 m range of the tunnel contour. (2) In the same circle, the grouting quantity of the same ring is presented as a wave form. Therefore the number of the same ring grouting holes should reduce and increase the distance between the adjacent grouting holes appropriately to reduce the number of grouting holes and speed up the grouting progress.

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