短语词组短语soft substratum soil replacement 软弱下卧层换土soft -soil reinforcement 软基加固soft muddy soil 淤泥质软土soft foundation soil 软弱地基sullage soft -soil 淤泥质软土soft clayey soil 软粘土地基saturated soft clay soil 饱和软粘土soft cohesive soil 软黏性土 返回 soft soil