摘要
开挖顺层岩石高边坡,往往需要进行预加固,因而合理确定坡体开挖松动区范围便成为核心问题。根据坡体开挖后的应力和位移状态,给出了开挖松动区的明确定义;结合重庆万州—梁平高速公路沿线各顺层高边坡失稳实例,对顺层高边坡开挖松动区进行了研究,简述了松动区的特点,分析了开挖松动区的影响因素。从岩体结构出发,以开挖深度和岩层倾角为主控元素,对顺层高边坡开挖松动区的长度进行了统计分析,结果表明:岩层倾角在15～30°的砂泥岩顺层高边坡最易产生开挖失稳,且松动区长度与开挖深度有关,二者比值较为集中地分布在2～5之间。
To cut a bedding high rock slope,usually it is necessary to take some reinforced structures in advance.How to determine the range of disturbed zone properly is a core problem.According to the stress condition and displacement condition after cutting a slope,the disturbed zone can be defined.Taking the bedding high rock slopes of Wanzhou-Liangping Expressway for example,mechanical properties and influential factors of disturbed zone are introduced.In addition,the disturbed zone of bedding high rock slope is studied on the basis of rock mass structure.It is most unstable when the inclination of rock stratum is between 15-30°;also there is a relation between length of disturbed zone and depth of cutting.The results show that the ratio of length of disturbed zone to depth of cutting is situated in between 2 and 5 to most sandstone and mudstone bedding high rock slopes.
出处
《岩土力学》
EI
CSCD
北大核心
2008年第6期1665-1668,共4页
Rock and Soil Mechanics
关键词
顺层高边坡
开挖深度
松动区长度
影响因素
岩层倾角
bedding high rock slope
depth of cutting
length of disturbed zone
influential factors
inclination of rock stratum
