摘要
山区公路的施工过程中，往往采用爆破的方法进行开挖。在爆破震动作用下，公路边坡的稳定与否直接涉及到施工的安全与经济，并对今后的运营安全有重要影响。用非线性动态有限元DYNA^2D程序对爆破震动作用下的边坡进行了数值模拟，分析了爆破过程中边坡体中应力、速度和加速度的分布和传播规律，以及边坡观测点的位移，并与实测结果进行了对比。研究表明；所采取的爆破方案是切实可行的，数值模拟结果为实际工程施工提供了依据。
Blasting is frequently used in cutting excavation during highway construction in mountainous area. Blasting vibration has negative effects on slopes, and the slope stability will exert great influences on the safety and economy of construction and the transportation. Therefore, a nonlinear FEM software-DYNA^2D was used to simulate the effect of blasting vibration on slope stability. The laws of distribution, transmission of stress, velocity and acceleration, and displacement of observation points are analyzed, which are used to compare with the results of in-situ test. The results are as follows： （1） on the surface of the slope, the maximum velocity and displacement appeared at the bottom of the slope, but the values are permitted; （2） within the rock mass, a large tension stress area exists, but the values of stress are not large enough to break the rock mass; and （3） in practical blasting vibration construction, monitoring should be performed at the bottom and top of slopes to ensure the velocities of permitted vibration. The results show that the adopted scheme of blasting is feasible, and numerical simulation can provide important proposal for practical engineering.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期4837-4842,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
边坡工程
爆破震动
边坡稳定性
数值模拟
slope engineering
blasting vibration
slope stability
numerical simulation
