考虑初始渗透压力的裂隙岩体本构模型二次开发及其验证

为充分研究含水裂隙岩体的力学特性,在摩尔库伦模型的基础上,充分考虑初始渗透压力的作用.对本构方程中的柔度张量进行适当的修正,生成考虑初始渗透压力的裂隙岩体本构模型.为了增加对比性,按照同样的理论推导方法及二次开发流程,在不考虑初始渗透压力的影响下,成功地生成未考虑初始渗透压力的裂隙岩体本构模型.在此基础上,利用C⁺⁺语言,将以上两种模型编译成可运行的动态链接库文件.为验证自定义本构模型的准确性,在FLAC3D中建立同一个50 m×50 m×1 m的圆形隧道数值模型进行对比分析.通过分别求解计算3种本构模型,分析各圆形隧道上4个对称点的位移变化情况.结果表明:将初始渗透压力直接引进本构方程中,利用C⁺⁺二次开发出来的本构模型是成功的.

Secondary Development on Fractured Rock Constitutive ModelConsidering Initial Seepage Pressure

In order to study of mechanical properties of water-bearing fractured rock, based on Mohr coulomb model, considering the role of initial seepage pressure, flexibility tensor of the constitutive equation is appropriately amended, the constitutive model of jointed rock considering initial seepage pressure is obtained. By comparison, the constitutive model of jointed rock is also obtained without considering initial seepage pressure, according to the same theoretical derivation method and secondary development process. The C⁺⁺ program of two models is compiled to verify the accuracy of the models, through building the same 50 m×50 m×1 m numerical model for circular tunnel in the FLAC3D, three kinds of constitutive model and 4 symmetric point displacements are analyzed in circular tunnel. The result shows that constitutive model introducing initial seepage pressure is successful accurate.