中文摘要：

采用室内三轴试验方法,基于塑性力学理论,获得泥岩峰后软化模量与围压的关系,构建了考虑围压影响的泥岩峰后应变软化模型,基于FLAC^3D平台进行开发,结合工程实例对模型进行验证.研究表明：构建的泥岩峰后应变软化模型可以考虑剪胀角的影响,符合围岩峰后变形的实际情况;数学模型能够较真实的反应岩石峰后非线性力学行为,为实现数值计算由定性向定量的转变奠定基础;通过现场实际应用表明,数值计算结果与现场实际情况吻合.

英文摘要：

Based on the theory of plastic mechanics,the relationship between the softening modulus and confining pressure were obtained using the three axis test method.The strain-softening model of mudstone was established considering the influence of confining pressure.Based FLAC^3D development platform,the model in practical engineering was validated.The results show that the strain-softening model of mudstone considering the effect of dilatancy angle can react the nonlinear mechanical behavior of rock,and provide the basis for the realization of the quantitative to qualitative change.Practical application shows that the numerical results agree with the actual situation.