提出了岩石失稳破坏应变梯度理论模型。

The theory of gradient strain is put forward.

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其次主要介绍了不含高阶应力的一类应变梯度理论及其应用；

Then, we introduce a strain gradient theory and its main applications, in which no high-order stresses are included.

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采用基于应变梯度理论的假设应变有限元方法研究了微尺度梁弯曲的尺寸效应。

An assumed strain finite element method based on the theory of strain gradient was proposed to explore the size effect that frequently exhibited in micro-beam bending.

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