裂隙岩石蠕变损伤渗流耦合力学实验与模型研究

Coupling mechanics problems of creep, damage and seepage of fissured rock are the hot and difficult point in the present rock mechanics and engineering field. The experiments of creep, damage and seepage coupling mechanics are conducted on fissured rock within rock automatic seepage-rheological triaxial test system. The nonlinear rules of creep deformation of fissured rock under the interaction between damage and seepage are studied. The effects of interaction between creep and damage on the permeability evolution rules in the process of the crack growth and evolution features of fissured rock are revealed, and the relational equations of permeability evolution under the interaction between creep and damage are built. With the key point of permeability evolution of fissured rock, the new permeability growth criterion of fissured rock under the multi-fields coupling of creep-damage- seepage is proposed, and the time-effect mechanism of permeability growth and evolution of fissured rock under the coupling of creep, damage and seepage is revealed. At last, in order to reflect the time-effect permeability evolution rules of fissured rock in the progress of the nonlinear creep damage deformation and the unsteady nonlinear evolution rules of creep damage under the coupling of seepage and stress, the coupled mechanical models of creep, damage and seepage are developed. The research results helps not only to expend and improve seepage mechanics of fracture rock mass, rock rheological damage mechanics and the multi-field coupling theory system forward unprecedented breadth and the depth development, but also meet the demand for current important hydraulic engineering and help to evaluate the long-time stability and safety.

裂隙岩石蠕变损伤渗流耦合力学问题是目前岩石力学与工程领域研究的热点和难点。本项目应用岩石全自动三轴渗流-流变力学实验系统，开展裂隙岩石蠕变损伤渗流耦合力学实验,研究裂隙岩石在损伤渗流耦合作用下蠕变变形过程的非线性规律，揭示蠕变损伤耦合作用对裂隙扩展过程中渗透特性演化规律的影响，建立蠕变损伤耦合渗透性演化关系方程；以岩石裂隙扩展演化为切入点，提出蠕变损伤渗流耦合作用下的新生裂隙扩展准则，揭示岩石裂隙扩展演化的蠕变损伤渗流耦合作用时效机制;建立反映裂隙岩石蠕变损伤非线性变形过程中渗透性时效演化规律和应力渗流耦合“非定常”非线性蠕变损伤演化规律的耦合力学模型。研究成果既有助于拓展和完善裂隙岩石蠕变损伤渗流耦合理论体系向纵深发展；又符合当前重大水利水电工程实际需求，有助于工程长期稳定性与安全性评价。

裂隙岩石蠕变损伤渗流耦合力学问题是目前岩石力学与工程领域研究的热点和难点。本项目应用岩石全自动三轴渗流-流变力学实验系统，开展裂隙岩石蠕变损伤渗流耦合力学实验,研究裂隙岩石在损伤渗流耦合作用下蠕变变形过程的非线性规律，揭示蠕变损伤耦合作用对裂隙扩展过程中渗透特性演化规律的影响，建立蠕变损伤耦合渗透性演化关系方程；以岩石裂隙扩展演化为切入点，提出蠕变损伤渗流耦合作用下的新生裂隙扩展准则，揭示岩石裂隙扩展演化的蠕变损伤渗流耦合作用时效机制;建立反映裂隙岩石蠕变损伤非线性变形过程中渗透性时效演化规律和应力渗流耦合“非定常”非线性蠕变损伤演化规律的耦合力学模型。研究成果既有助于拓展和完善裂隙岩石蠕变损伤渗流耦合理论体系向纵深发展；又符合当前重大水利水电工程实际需求，有助于工程长期稳定性与安全性评价.