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基于严格意义上的Lade-Duncan准则,将挡土墙土压力计算问题视为平面应变问题,推得了黏性土与无黏性土的主动和被动土压力计算公式,推导中由于考虑了中主应力的影响,所以更真实地反映了土压力的作用情况。与以往应用Lade-Duncan准则在平面应变条件下的强度公式不同,该推导完全基于LadeDuncan准则,而没有借助由SMP准则得到的中主应力公式。为了验证公式的有效性和优势,将公式计算与实测结果进行对比。结果表明:相对于朗肯理论和基于SMP准则的方法,该方法更为接近实测结果,而又留有一定的安全储备。
Based on the strict Lade-Duncan criterion, the problem of earth pressure on retaining wall is regarded as the problem of plane strain, and the formulas of active and passive earth pressure of clay and non-cohesive soil are deduced. In the derivation, Stress, so more realistically reflect the role of earth pressure situation. Different from the intensity formula of Lade-Duncan criterion in the past under plane strain condition, this derivation is based entirely on LadeDuncan criterion, without using the medium principal stress formula obtained from the SMP criterion. In order to verify the validity and advantage of the formula, the formula is compared with the measured results. The results show that, compared with Rankine theory and SMP-based method, this method is closer to the measured results, while leaving some safety reserves.