深部开挖扰动下岩体变形破坏的大变形-非连续变形方法研究

随着我国交通建设、水电开发、资源开采等重大工程的飞速发展，地下空间开发不断走向深部。深部地下工程建设中，大规模开挖不仅诱发岩体产生大变形，还会造成岩体在能量驱动下的非连续变形，岩体破坏行为复杂、灾变机制不明，导致工程中凭经验作业、时效性差、灾害频发。其根本原因是开挖扰动应力路径下岩体大变形-非连续变形耦合行为的理论分析和计算手段尚不完善，致使深部岩体变形破坏与致灾过程难以准确描述和科学预测。基于此，本项目试验研究扰动应力路径下深部岩石大变形力学行为；结合有限变形理论和分形理论，揭示开挖扰动下岩石大变形的宏细观机理；建立深部开挖扰动下岩石大变形描述方法和本构方程；探索开挖扰动下岩石变形破坏过程中能量转移转化规律；发展可以同时描述岩体大变形和非连续变形的数值方法。结合工程实测，分析开挖扰动下岩体从连续大变形到非连续破断的过程、特征与规律，为深部工程中围岩灾害防治提供有效指导和理论依据。

As the rapid development of the key projects, such as transportation construction, hydropower engineering and the resource exploitation, the depth of the underground space continues to increase. During the construction of the deep underground engineering, the massive excavation will result in the discontinuous deformation driven by the energy as well as the large deformation of the rock. The behavior of the rock is complicated, the failure mechanism is unclear. Therefore, the problems, such as operating field work by experience, weak effectiveness, frequent disasters, are remarkable in current deep underground engineering. The fundamental cause is that the large deformation and the discontinuous deformation behavior of the rock under the stress paths of the excavation disturbance is short of effective theory and computation method. Thus, the entire process of the deformation, failure and disasters of the deep rock can not be described accurately and forecasted scientifically. Aiming at this problem, the large deformation behavior of the rock under the stress paths of the deep excavation disturbance will be studied with experiments firstly. Based on the finite deformation theory and fractal theory, the macroscopic and mesoscopic mechanism of the rock large deformation will be revealed. The description method and constitutive model of the large deformation of the rock under the deep excavation disturbance will be presented. The energy transfer and transformation law of the rock during deformation and failure will be studied. Then, the numerical method which can deal with both the large deformation and discontinuous deformation behavior of the rock will be developed. According to the engineering practice, the process, characteristic and evolution law of the large deformation and discontinuous deformation of the rock mass under the excavation disturbance will be modeled and analyzed. The study of this project can provide an effective guidance and theoretical basis for the prevention of the surrounding rock disasters of the deep underground engineering.