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| Superposition Algorithm for the Outer Pit Passive Earth Pressure Influenced by Inner Pit for Pit-in-Pit |
| SHEN Ming-Liang, LIAO Shao-Ming, SHAO Wei |
| (Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China) |
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Abstract The concerning passive pressure was analyzed based on Coulomb soil pressure theory and superposition principle. According to different shapes of slide wedges, four analytical models and formulas were proposed respectively. The mechanical results calculated by the method in this paper and that of Shanghai technical code for excavation engineering were compared, which demonstrates that the existence of inner pit will greatly reduce the passive pressure of outer one while the design based on Shanghai technical code for excavation engineering will lead to overestimating stability of pitinpit excavation.
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Received: 07 June 2011
Published: 30 January 2012
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