摘要
通过对顺层岩质边坡的受力分析,应用极限平衡理论和Mohr-Column准则,按照Bishop关于边坡稳定性安全系数的定义,推导出在爆破震动载荷作用下,用于判别顺层岩质边坡稳定性的计算方法。研究结果表明垂直向下、水平指向坡外的爆破荷载以及两者的联合爆破荷载对边坡稳定性影响最大,尤其是后两者;水平指向坡外、垂直向下爆破荷载拟静力系数分别与边坡稳定性安全系数间呈负指数关系和S曲线关系;从动荷载拟静力系数0起,爆破震动水平指向坡外、垂直向下动荷载拟静力系数每增加0.05,有层裂长度的顺层边坡安全系数分别减少7.79%-10.67%、1.28%-1.98%,无层裂的顺层边坡安全系数分别减少7.61%-10.55%、1.47%-2.29%。同时,爆破震动产生的层裂长度、边坡长度以及联合爆破荷载的方向对顺层边坡稳定性也有影响。
The rock mass bedding slope was constantly met in the construction of open pit,railway,highway et al, and yielded serious damage. The slope stability under blasting has been continually concerned at home and abroad. Based on the analysis acting forces of the slope slice, a calculation method of safety coefficient on the slope stability was given according to the definition of safety coefficient and Mohr-Column criteria. The reliability of the method was verified. The relation between pseudo-static coefficient under blast seism condition and safety coefficient on rock mass bedding slope was explained. The results show that the greatest acting forces were horizontal dynastic load and vertical dynastic load as well as their combined dynastic load by the computed results in some engineering case, es- pecially the last two forces. The relation between horizontal dynastic load pseudo-static coefficient and the safety coefficient as well as vertical dynastic load pseudo-static coefficient and the safety coefficient was S type and negative exponential function. When horizontal dynastic load pseudo-static coefficient was added 0. 05 from 0, the safety coefficient which the cracked length was zero and 9. 71 m to 12. 76 m was respectively reduced 7.79% to 10. 67% and 7.61% to 10. 55%. When vertical dynastic load pseudo-static coefficient was added 0. 05 from 0,the safety coefficient which the cracked length was zero and 9. 71 m to 12. 76 m was respectively reduced 1.28% to 1.98% and 1.47 % to 2. 29%. Meanwhile, the slope length, the cracked length, the acting direction of cl ombined load affect the slope stability.
出处
《山地学报》
CSCD
北大核心
2007年第2期184-189,共6页
Mountain Research
关键词
拟静力法
顺层岩质边坡
爆破震动
安全系数
Pseudo-static analysis
rock mass bedding slope
blasting
safety coefficient
