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Rankine理论土压力的计算简单方便,常应用于实际工程的设计,但当填土较深时由于计算主动土压力值偏大而使支挡结构的设计不经济。在Rankine假设的基础上采用水平条分法推导了主动土压力的分布。以内摩擦角φ=15°为例,分析了忽略支挡结构与土体间摩擦时主动土压力系数沿填土深度的变化,得出了土压力呈非线性分布的原因。通过算例总结了砂性填土和粘性填土主动土压力的分布特点,提出了主动土压力近似分布图式,为支挡结构的设计提供一定的参考。
Rankine theory earth pressure calculation is simple and convenient, often used in the design of the actual project, but when the fill is deep because of the calculation of the active earth pressure value is too large to make the support structure design uneconomical. Based on the Rankine assumption, the horizontal slice method is used to derive the distribution of active earth pressure. Taking the internal friction angle φ = 15 ° as an example, the reason for the nonlinear distribution of earth pressure is obtained when the active earth pressure coefficient is ignored along the soil filling depth when the friction between the retaining structure and soil is neglected. An example is given to summarize the distribution of active earth pressure of sand-filled and viscous earth fill. An approximate distribution of active earth pressure is proposed to provide some references for the design of support structure.