关于《水工挡土墙设计规范》(SL379-2007)有关土压力计算的商榷

Discussion on Earth Pressure Calculation in Hydraulic Retaining Wall Design Code (SL379-2007)

全面分析《水工挡土墙设计规范》(SL379-2007)出现的主动土压力系数、土压力计算公式不完善、不完整、错误等问题,推导出墙后为水平面与无限斜坡面组合时、墙后填土为有限斜坡面、墙后填土为水平面与有限斜坡面组合等3种情况下的主动土压力计算公式,使得计算简单、明了;分析了衡重式挡土墙衡重台主动土压力计算公式与计算简图存在的错误,推导出正确的计算公式;探讨了岩石坡面对土压力的影响因素,给出了有限范围填土临界破裂角计算公式和有限填土土压力计算判别模式,更好地用于土压力工程计算。

The problems that active earth pressure coefficient and calculation formula of earth pressure are imperfection, incompleteness or error in hydraulic retaining wall design code (SL379-2007) are analyzed comprehensively and the formula of active Earth pressure is derived in 3 different cases when the back wall is composed by horizontal plane and infinite slope, the back wall is composed by finite slope and the back wall is composed by horizontal plane and finite slope to simplify the calculation. The calculation formula of the active earth pressure on the counterweight retaining wall is in contradiction with the calculation diagram and there are some calculation errors so we give out the right one. The influence factors of rock slope on earth pressure are discussed and the critical rupture angle formula and the discriminant model is given which can be used to guide the engineering design.