爆破开挖对路堑高边坡稳定性影响分析

ROAD HIGH CUTTING SLOPE STABILITY ANALYSIS UNDER INFLUENCE OF BLASTING FOR EXCAVATION

岩质高边坡是山区公路建设中常见的一类边坡工程,其动力稳定性分析一直是岩土工程密切关注的问题。在分析路堑开挖爆破振动及其效应的基础上,探讨边坡动力稳定性的分析方法和安全评价标准;结合延庆—龙庆峡路改建工程,建立爆炸荷载作用下路堑边坡动力响应的有限元分析模型,探讨不同爆破方法和不同设计边坡条件下,下台阶爆破开挖对上台阶边坡稳定性的影响。研究结果表明,采用缓冲爆破技术,同时设计采用适宜的边坡坡度,可有效降低边坡质点振动速度,控制爆破开挖对路堑边坡稳定性的影响。

High rock slope is a common type of slope in mountainous areas during highway construction, and the issue of its stability has been closely followed by geotechnical research scholars. Based on research of the blasting vibration and its effect during the excavation of cutting slope, the analytical methods and the evaluation criteria of the high rock slope＇s dynamic stability were discussed. Taking Yanqing-Longqingxia road reconstruction project as the background, a finite element analysis model of the dynamic response of high rock cutting slope under the load of explosion was established and the explosion＇s influence on the dynamic stability of upper bench slope during the excavation of lower bench slope with different blasting design parameters and different slope design types was discussed. The results of the detailed research indicated that the particle vibration velocity of slope strikingly decreased when using cushion blasting technology and suitable design degree of slope, and the influence of blasting on the cutting slope stability was effectively controlled.