短語詞組短語subgrade settlement observation 路基沉降觀測Mechanism of subgrade settlement 路基沉降機(jī)理soft soil subgrade settlement 軟土路基沉降subgrade settlement monitoring system 路基沉降觀測control of subgrade settlement 沉降控制subgrade stability and settlement 路基穩(wěn)定性和沉降differential settlement of subgrade 路基不均勻沉降settlement of subgrade 路基沉降post -construction settlement of subgrade 路基工後沉降 返回 subgrade settlement