人民长江Issue(13)：33-38,6.DOI:10.16232/j.cnki.1001-4179.2015.13.009
动力作用下危岩稳定性计算的断裂力学方法
Calculation method of fracture mechanics for unstable rock stability analysis under dynamic load
邓跃 1周云涛2
作者信息
- 1. 重庆路达工程勘察设计咨询有限公司，重庆401120
- 2. 重庆交通大学 河海学院，重庆400074
- 折叠
摘要
Abstract
In order to study the influence of blasting on unstable rock mass, the attenuation law of the stress wave in rock mass is studied and the dynamic load expression of the blasting stress attenuating to the gravity center of unstable rock is obtained. In combination with the blasting load, the calculation method for fracture factor of the dominant fissure of three types of unstable rock is put forward, and further the time history analysis method for dynamic stability of unstable rock is put forward. By using this method, the dynamic stability of 5 unstable rock masses of Taibai rock in Wanzhou District of Chongqing are calculated and analyzed. It shows that the minimum stability coefficient of three kinds of unstable rock under the blasting dynamic effect is obvi-ously reduced;under the influence of blasting dynamics, the stable state of the rock becomes unstable. The time-history curves of dynamic stability of unstable rock indicate that the stability coefficients of unstable rock in the blasting fluctuate with time, in general, the peak value of dynamic stability coefficient presents a decreasing trend, and with the attenuation of blasting wave it generally tends to the stability coefficient under the natural conditions. As the time goes by, the periodical cycle of the blast dy-namic load becomes longer, which intensified the danger of unstable rock.关键词
岩体工程/稳定系数/断裂力学/时程分析/危岩Key words
rock mass engineering/stability coefficient/fracture mechanics/time history analysis/unstable rock分类
天文与地球科学引用本文复制引用
邓跃,周云涛..动力作用下危岩稳定性计算的断裂力学方法[J].人民长江,2015,(13):33-38,6.
