危岩稳定性评价的颗粒流断裂力学法  

Stability evaluation of unstable rock based on particle flow simulation and fracture mechanics

作　　者：陈鹏宇[1] 曾红彪[2] 师华鹏 李雄峰[2] 余宏明[2] 

机构地区：[1]内江师范学院地理与资源科学学院,四川内江641100 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《自然灾害学报》2016年第3期87-95,共9页Journal of Natural Disasters

基　　金：国家自然科学基金项目(41272377)~~

摘　　要：针对危岩稳定性评价问题,结合颗粒流数值模拟方法和断裂力学理论,建立了危岩稳定性评价的颗粒流断裂力学法。选用接触黏结模型,建立了断裂韧度颗粒流数值试验方法,并通过应力强度因子计算公式求取颗粒流数值试样的断裂韧度。根据断裂韧度与接触黏结强度之间的关系,建立了断裂韧度的细观参数标定方法。最后通过实例分析了上述方法在危岩稳定性评价中的应用,分析结果验证了其可行性。Particles flow fracture mechanics method for the stability evaluation of unstable rock was established by combining the particle flow numerical simulation method and fracture mechanics. The contact bond model was chosen to establish particle flow numerical experiment method of fracture toughness, and the fracture toughness of numerical sample was calculated through the stress intensity factor calculation formula. According to the relationship between the fracture toughness and the contact bond strength, the mesoparameters calibration method of the fracture toughness was set up. Finally, through a case study of unstable rock, the feasibility of the proposed method in this paper was verified.

关 键 词：危岩 稳定性 颗粒流 断裂韧度 断裂力学 

分 类 号：P642[天文地球—工程地质学]