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对砂堆三棱柱的基底应力分布及应力凹陷现象进行了研究,基于固定主应力轴假设(FPA假设)将砂堆分为应力状态已知的I区和应力状态未知的II区,并假设了II区内的多种剪应力分布来求解II区内的应力状态,最后,将不同剪应力分布假设下砂堆中线上的静止土压力系数值与Kulhawy公式计算值对比,可得出如下结论:基底法向应力存在应力凹陷现象,自然休止角越大(砂堆越紧密),应力凹陷程度、应力凹陷范围越大;不同剪应力分布假设下,II区应力分布形态不同,法向应力极小值所在处也不同。剪应力二次方分布假设和三次方假设下砂堆基底应力分布最为合理、最为符合真实情形。
Based on the hypothesis of fixed principal stress axis (FPA assumption), the sandbank is divided into zone I with known stress state and zone II with unknown stress state. It is assumed that II region to solve the region II stress state, and finally, under the assumption of different shear stress distribution in the sand pile on the neutral earth pressure coefficient values and calculated Kulhawy formula can be drawn as follows: There is stress sag phenomenon in the normal stress of the substrate. The larger the natural angle of repose (the closer the sands are), the more the stress sag and the sag range. Under different shear stress distributions, the stress distribution in region II is different and the normal stress is very small Where the value is different. Under the assumption of quadratic distribution of shear stress and the cubic assumption, the stress distribution of sand foundation is the most reasonable, most in line with the real situation.