考虑应变软化效应的裂隙岩体损伤本构模型的开发及应用

地下洞室埋深愈深，应变软化现象愈明显。为研究深部裂隙岩体开挖后巷道围岩的变形特征，基于应变软化模型，结合裂隙岩体损伤及演化本构方程，利用FLAC^3D软件的二次开发功能，采用VC++编程语言，建立考虑应变软化效应的裂隙岩体损伤本构模型。以某矿井地下圆形巷道开挖为例，分别采用应变软化模型和自开发的本构模型对该算例进行数值模拟，巷道围岩的位移、塑性区和安全系数的对比结果表明，开发的本构模型能够较好地反映出岩体应变软化特性和裂隙对岩体的损伤作用，可对维护围岩体的稳定性提供参考。

Development of Constitutive Model of Fractured Rock Mass Based on Strain Softening Effect and Its Application

With the increase of buried depth in underground caverns, the phenomenon of strain softening is more obvious. In order to research the deformation characteristics of the fractured rock mass from deep underground after excavation, we set up a new constitutive model in association with strain softening model and constitutive model of fractured rock mass. Based on the secondary development function of FLAC software, this constitutive model was developed in VC++ programming environment. Excavation of the underground circular tunnel of a mine was taken as an example. Numerical simulation was carried out for the example by using strain softening model and self-developed constitutive model respectively. Analyses on deformation, plastic zone and safety factor in the surrounding rock show that the model can reflect the damage action of strain softening and cracks on rock mass, and the model can provide a reference for maintaining stability of surrounding rock.