A. 一般黏性土路堑边坡高度不大于20m时边坡坡率不宜陡于1：1
B. 边坡高度大于20m的软弱松散岩石路堑，宜采用分层开挖、分层防护和坡脚预加固技术
C. 当岩石挖方高度超过20m时，应进行路基高边坡个别处理设计
D. 硬质岩石挖方路基宜采用光面爆破或预裂爆破技术
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