证明了泛函j的一次变分为零相当于满足刚塑性体动力学的全部方程。
It is proved that the vanishing of the first variation of the functional J is equivalent to all the equations which should be satisfied in the dynamics of rigid-plastic continua.
根据刚塑性体的静力平衡条件，推导了方形浅基础地基承载力的理论解。
A new theoretical solution of shallow square foundation is presented based on static equilibrium of rigid-plasticity body.
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