煤岩体的弹塑脆性本构模型及其数值试验

为了准确预测岩石破损区的发生时间和扩展情况，在岩石材料的非均匀特性基础上，建立了一个具有应变硬化的弹塑脆性本构模型，同时编写了相应的有限元计算程序并对其模块化，并通过预置裂纹板的拉伸试验和岩样单轴受压试验来验证该模型。结果表明：所建立的数值模型是可靠的，可以较精确模拟裂纹扩展情况与局部化剪切带的发展模式。新本构中的应变硬化阶段，可以在破坏之前看出应力集中和单元屈服情况，尤其可以区分拉破坏和屈服后的剪破坏。

Elastic-plastic-brittle constitutive model of rocks and its numerical validation

In order to accurately predict the broken time and crack-growth in rock,based on non-uniform characteristics of rock material,a particular elastic-plastic-brittle constitutive model,considering the heterogeneity of rock and the features of deep engineering,was presented,and the corresponding finite element program was written and modularized.Through the simulation of two tests,including the tension test of pre-existing crack board and the compression test of rock samples,it is shown that the present model is rational and accurate,which can more accurately simulate crack growth and the development mode of localized shear band.In the strain-hardening stage of new constitutive model,stress concentration and unit yield happen before the failure of rock,especially tension failure and shear failure after the unit yield can be distinguished.