摘要
采用ANSYS/LS-DYNA数值模拟方法,分4种工况对锦屏一级水电站坝肩高陡边坡开挖爆破的动力稳定性进行了数值模拟研究,采用质点振动速度和安全系数2个指标评价边坡的稳定性,重点研究了潜在滑体在开挖爆破过程中的安全。分析结果表明,受左岸岩体中发育的f5、f8等断层影响,在进行EL.1 910～1 885 m台阶开挖爆破时,边坡关键部位质点振动速度接近10 cm/s的允许值;在爆破动力影响下,使潜在滑体业已降低的静力安全系数进一步受影响,最小安全系数略大于施工安全系数1.15。提出了相应减振措施:每开挖一个台阶后须对潜在滑体进行系统锚索加固和坡面喷护,降低爆破规模和单段药量,实测结果表明,采取锚固支护后,边坡振动速度明显降低。
The numerical simulation method ANSYS/LS-DYNA was adopted to study the dynamical stability of high and steep slope at Jinping one-stage hydropower station in four working conditions.the particle vibrating velocity and safety factor were used to evaluate the stability of slope,emphatically researched the safety of potential slip mass in blasting excavation.The analytic results show that,owing to influence of f5、f8 fault ages etc in left side bank rock mass,the particle vibration velocity approaches the permitted value 10cm/s at key position of slope in EL.1 910 m^1 885 m bench blasting;as a result of blast dynamic influence,the depressed static force safety factor farther suffers from influence at sliding face of potential slip mass,the minimal safety factor is appreciably greater than construction safety factor 1.15.Based on the analysis,the vibration damping measures are put forward such as systematic anchor cable reinforcement and concreting after each bench blasting,minishing blasting scale and charge amount per delay.The monitored results show that the vibration velocity of slope decreases obviously after anchor cable reinforcement.
出处
《爆破》
CSCD
北大核心
2011年第1期35-39,共5页
Blasting
基金
国家自然科学基金项目(50974031)
