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By taking Sanshandao Gold Mine Foundation Pit Supporting Project as an example, targeting at the end-suspended pile supporting structure applied in soil-rock mixed stratum common in mountainous and hilly area, this paper introduces unified strength theory and revised Hoek-Brown strength criterion to calculate and analyze active soil pressure, passive soil resistance and overall stability of supporting structure, during which not only the influence of intermediate principal stress, but also the influence of structural surface, weathering degree and disturbing degree of the rock can be taken into consideration. Therefore, theoretically speaking, it is much more scientific than traditional soil pressure theory, and the results are closer to actual engineering properties, thus being of critical theoretical significance and engineering reference value to perfecting design calculation theory of end-suspended pile supporting structure and optimizing design of foundation pit supporting structure.

Theoretical Analysis on Soil Pressure Acting on End-Suspended Pile Supporting Structure to Foundation Pit in Soil-Rock Mixed Stratum