西部通道口岸场地原为浅海区和蚝田，场地内遍布7.0~24.0 m的淤泥及淤泥质粘土，东侧和南侧海堤所 处的位置海水深，淤泥厚度大，软基处理难度很大。对此分别提出了不同的软基处理方法。对外海堤(东侧、南侧)的填筑采用抛填块石，利用爆炸排淤法结合强夯法进行处理;对场坪内软基采用塑料排水板结合堆载预压 排水固结方法进行处理;隔堤、海堤与场坪的过渡带采用砂石桩加固，隔堤、海堤堤身采用强夯加固。经实践证 明，上述方法是成功的，值得在类似工程中推广。

The site of Shenzhen West Corridor Port was neritic zone and oyster land with lots of 7.0-24.0m mud and silt c1ay.The seae mbankments in east and south were at deep marine zone with great thickness of mud.Therefore,it was difficult to treat subgrade in soft soil zone. The different methods were proposed for treat the subgrade in soft soil zone because of the complexity of the engineering of filling sea and treating subgrade for Shenzhen West Corridor. To the outside sea embankments in east and south, they were filled by stones and treated by the method of explosive drain mud, along with strong consolidation. To the subgrade in soft soil zone within yard plateau, it was treated by the method of plastic drainage plate along with method of stockpile loading pre-pressure for drain water and consolidation. To the insulation embankment and transition zone between sea embankment and yard plateau , they were reinforced by sand pile. The bodies of insulation embankment and sea embankment were treated by strong consolidation. The practices show the application of the methods mentioned above are successful and worth being applied widely.