软弱岩体的动力特性和非线性本构模型

Considering the damage that the time-dependent and dilatation behaviors of the soft rock did to the development of underground space, through theoretical research, laboratory and.field tests and numerical simulation, the creep rule and the stress-strain-time constitutive model of the soft rock are investigated in this project. The mechanical behavior of the soft rock under dynamic loads and the influence of the weak plane and crack to the strength and deformation of the soft rock are investigated. Theoretical criterion is provided to reduce the catastrophic failure of the soft rock project. The time-dependent stress-strain behavior of triaxial tests of the diatomaceous soft rock in both normal consolidated and over consolidated states are simulated using parallel genetic algorithm and a 3D elastic visco-plastic constitutive model based on the concept of “equivalent time” and new time-dependent stress-strain-time constitutive models are established. The results showed that the constitutive model we established magnificently reflected the constitutive behavior of the diatomaceous soft rock and verified the reasonableness and the practicability of the model. The research findings have creativity and widely application future.

针对软岩的时效性和膨胀性给地下空间利用中造成的危害，通过理.论研究、室内外试验和捣抡婕扑悖芯咳硌业牧鞅涔媛桑?描述软岩全应力-应变关系的应力-应变-时间本鼓Ｐ停谎芯吭诙稍叵氯硌业牧ρ匦约把姨逯腥砣趺婊虿牧严抖匀硌仪慷缺湫?的影响，为减轻软岩工程的灾害性破坏提供理论依据。研究成果具.有创新性和广泛的应用前景.。.