岩体尖端裂纹扩展特性研究

岩体在压剪状态下的力学特性研究应用至今已有十余年,发展比较完善。而对于拉剪应力状态下岩体的力学特性,以及在拉剪应力状态下岩体的损伤扩展与演化方面的研究成果较少。为此,对岩体在拉剪应力状态下岩体的损伤扩展与演化进行理论分析研究,在前人提出的裂纹尖端塑性区内方向应变能概念的基础上,基于岩石破坏准则,对复合型裂纹扩展进行了研究,研究成果对解决实际岩体工程问题有一定的参考价值。

Study on Crack-Tip Propagation Characteristic of Rock Mass

The study on the mechanics characteristics of rock mass under the shear-compression condition is over ten years. Now it has been mature. However, for the mechanics characteristics and its damage, propagation, evolution of rock mass under the shear-tension condition, the researches hardly come true. This paper elaborates the theoretical analysis on the damage, propagation and evolution of rock mass under the shear-tension condition. A new concept of strain energy a- long radius from crack tip within plastic zone is presented based on research results of the predecessors. Then the mixed crack propagation is also studied based on the failure criterions of rock mass. These studying results have some application and reference value for solving practical rock mass problems.