人工制备土样的非线性破坏试验及对朗肯被动土压力的影响

Artificial soil sample preparation for non-linear failure test and influence on Rankine passive earth pressure

通过直剪试验研究了土的非线性破坏准则,给出了刚性挡土墙的朗肯非线性被动土压力公式并采用自适应步长Simpson积分法进行了求解,与线性Mohr-Coulomb破坏准则下朗肯被动土压力进行了对比,结果表明,采用线性Mohr-Coulomb破坏准则计算的被动土压力结果偏大35%～40%,在实际工程设计中偏于不安全。最后讨论了不同深度及非线性参数的影响。

The direct shear test is employed to study the non-linear failure criterion of soil and the Rankine passive earth pressure nonlinear formula is given by using adaptive step Simpson integration. Then this formula is compared with the Rankine passive earth pressure formula based on linear Mohr-Coulomb failure criterion. The results show that adopting the Mohr-Coulomb linear failure criterion can provide a higher 35% -40% passive earth pressure value, and causing insecurity factor in real project. At last the influence of different depth and various nonlinear parameters are also presented.