Stress Field at a Tip of a Prefabricated Spiral V-Notch
-
摘要: 在研究传统切槽爆破的基础上,提出用螺旋切槽爆破方法进行土石方的松动爆破.用断裂力学理论和Westergaard方法,确定了复变应力函数,推导出螺旋切槽在准静态压力作用下的裂纹尖端平面应力、应变场.定义了螺旋切槽孔松动爆破的应力强度因子表达式,能较好地反映螺旋切槽孔的断裂力学性能,是竖直V型切槽爆破、直线裂纹等现有理论的推广.Abstract: Based on the tranditional V-notched blasting, a technique of spirally V-notched blasting to loosen earth and rock was presented. Fracture mechanics and Westergaard stress function were adopted to build a complex stress function to derive the plane stress and strain fields at one tip of the crack under a quasi-static pressure. An expression was formulated to define the stress intensity factor of spiral V-notch loosen blasting. Factors that have effects on the stress intensity factor were studied. It is demonstrated that spiral V-notch loosen blasting is an extension of vertical V-notch blasting, straight cracking, and alike theories.
-
Key words:
- prefabrication /
- spiral notch /
- stress field /
- stress intensity factor /
- quasi-static pressure
-
[1] 叶晓明,李成芳.三维切槽孔爆破方法[J].地下空间,1999,19(3):212—218. [2] 郑周练,陈山林,叶晓明.切槽爆破研究的历史及现状[J].重庆建筑大学学报,2001,23(6):103—108. [3] 沈成康.断裂力学[M].上海:同济大学出版社,1996. [4] 高军石,杨军,张继春.准静态压力作用下岩体爆破成缝方向与机理研究[J].爆炸与冲击,1990,10(1):76—84. [5] 王成瑞.预制V型裂纹尖端应力强度因子的研究[J].应用数学和力学,1992,13(5):469—477. [6] 黎在良,王元汉,李廷芥.应力强度因子的数值计算[M].北京:地震出版社,1996. [7] 张行.断裂力学中应力强度因子的解法[M].北京:国防工业出版社,1992. [8] 杜云贵,张志呈,李通林.切槽爆破中V形切槽产生的力学效应研究[J].爆炸与冲击,1991,11(1):26—30.
计量
- 文章访问数: 2619
- HTML全文浏览量: 148
- PDF下载量: 499
- 被引次数: 0