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传统的土压力计算方法所求结果实际为极限状态土压力值,在工程设计中采用该值可能导致浪费或是产生偏于不安全的后果。而目前对于非极限状态下土压力计算的研究主要假定直线破裂面并针对填土为松散的干砂这一特定情况。鉴于此,考虑不同密实度砂土摩擦角与位移的关系,建立滑裂面为曲面情况下土压力的逐层计算方法,推导非极限状态下被动土压力强度、合力及其作用点的计算公式。分别验算填土为不同密实程度砂土以及饱和砂土的模型试验,与实测数据对比,发现两者结论比较吻合。
The traditional calculation method of earth pressure actually results in the limit earth pressure value, which may lead to waste or unsafe consequences in engineering design. At present, the research on earth pressure calculation under the non-limit state mainly assumes the straight-line rupture surface and aiming at the specific situation that the earth filling is loose dry sand. In view of this, taking into account the relationship between the friction angle and displacement of different compacted sand so as to establish a layer-by-layer calculation method of earth pressure under the condition that the sliding surface is curved, the formula of passive earth pressure intensity, resultant force and its action point under non-limit state . The different types of sand and saturated sand as well as saturated sand were tested respectively. Compared with the measured data, it was found that the two conclusions are in good agreement.