关键词: 土拱效应, 刚性挡墙, 土压力, 主应力拱

Abstract: Based on Coulomb’s earth pressure theory, assuming the trace of the principal stress arching in the back of rigid retaining wall as parabola, the theory formulae are obtained including the lateral coefficients of active and passive earth pressures and the friction coefficients of horizontal differential elements; then improved formulae of active and passive earth pressures are presented. The results show that the calculation results considering soil arching are consistent with the ones of model tests. Being in active limit state, the inner friction angles become smaller, the outer friction angles on the soil-wall interface become larger; the effect of soil arching becomes more distinct; as a result, the application point of resultant active earth pressure is higher. Being in passive limit state, the inner friction angles and the outer friction angles on the soil-wall interface are larger, the effect of soil arching becomes more distinct; and the application point of resultant passive pressures is lower.

Key words: soil arching, rigid retaining wall, earth pressure, principal stress arching