The hard soil and soft rock is one kind of special weak rocky soil which in the Ningxia Liupanshan area highway construction often meets, it has the adverse effect to the road side slope stability.

• 硬土软岩是宁夏六盘山地区公路建设中常遇到的一种特殊软弱岩土,它对公路边坡的稳定性有不利影响。