良好的地基有两个条件：强度高、压缩性低，但在实际施工中，工程地基的性能并不令人满意，因此有必要对地基进行处理。所谓地基处理，就是根据上层建筑的要求对地基进行加固或改进，提高地基土的承载力，保证地基的稳定性，减少建筑物的沉降或不均匀沉降。消除湿陷性黄土的湿陷性，提高其抗液化能力等。建筑加固公司常用的人工地基处理方法有：土置换垫层法、重锤表面压实法、强夯法、振动冲击法、砂桩法、压实法、深层搅拌法、堆载预压法、化学加固法等。

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