摘要
爆破施工不可避免地会造成近场岩体损伤,影响工程安全。为探究爆破损伤的弱化效应,基于扰动因子D,评价爆破损伤对岩体力学性质及稳定性的影响。以纵波波速表征D的空间分布规律,计算损伤区岩体力学性质空间劣化情况,探讨D值的分布规律对岩体安全系数的影响。结果表明,损伤影响范围内岩质边坡力学参数随深度劣化明显;采用D渐变弱化的方式,能较好的反映爆破损伤对边坡稳定的实际影响。
Blasting excavation will inevitably cause the damage of the near field rock masses,which will influence the engineering safety. In order to explore the weakening effect of blasting damage,based on the disturbance factorD and evaluate the influence of blasting damage on mechanical properties and stability of rock mass. The spatial distribution ofD was characterized by the longitudinal wavevelocity,then the spatial deterioration of mechanical properties of rock mass were calculated based onHoek-Brown strength criterion, the influence of the distribution ofD value on the safety factor was explored. The results show that the mechanical parameters of the rock slope in the area affected by thedamage are significantly degraded with the depth;the gradual weakening of the D gradient can betterreflect the actual impact of blasting damage on the stability of the slope.
作者
徐帅
XU Shuai(College of Civil Engi. and Architecture,Zhejiang Univ.,Hangzhou 310058,China)
出处
《低温建筑技术》
2018年第5期108-110,共3页
Low Temperature Architecture Technology
基金
浙江省交通运输厅科研项目(2014H21)
关键词
Hoek-Brown模型
弱化效应
扰动因子
力学性质
工程安全
Hoek -Brown strength criterion
weakening effect
disturbance factor
mechanical properties
engineering safety
