散体结构岩质高边坡的开挖参数研究

目前,岩石边坡开挖参数选择多采用工程地质比拟法。使用现行的工程地质比拟法确定边坡开挖的参数,很大程度上取决于使用者的工作经验和新设计边坡与参考表所列边坡的可比性,缺乏理论依据,所设计出的开挖边坡不是过分偏于安全,就是边坡产生局部和整体失稳,发生破坏。为此,针对散体结构岩质边坡,从理论分析的角度出发,通过对几种常用参数的边坡开挖进行数值模拟,比较各种台阶坡比、台阶平台宽度、台阶高度下的边坡开挖的位移应力变化,充分考虑了边坡经开挖后的稳定性和经济性,提出了针对散体结构岩质高边坡的优化开挖参数,为边坡开挖提供理论依据,对工程实践起着重要的指导作用。

STUDY ON EXCAVATION PARAMETERS FOR HIGH ROCK SLOPE OF SCATTERED STRUCTURE

The parameters of rock slope excavation are mostly selected by analogy method of engineering geology at present. However,the selected parameters are chiefly determined by experience of the user and comparability between the newly designed slope and the slopes ranked in reference table,the theory is lack of reliability,and the newly-designed slope is over-safe or under-safe. Therefore,with respect to the rock slope of scattered structure, the slope excavation process is modeled by numerical simulation;and the variation of displacement and stress for various sidestep ratio,height and platform width are compared,the stability and economy of the slope excavation are fully considered;and the optimization parameters of slope excavation are proposed. The research will provide theoretical basis for slope excavation.