一般软弱地基是指土层中的淤泥质土、冲填土、杂物土以及其它高压缩性土层。所谓杂物土,是指建筑垃圾和性能较稳定的工业废料的堆积层。 局部软弱地基是指天然土层软弱、坚硬厚薄不均匀性造成的软弱带以及人为的暗塘暗沟,还有河道冲刷堆积厚薄不均堆积层等。 Generally soft ground refers to muddy soil, backfilled soil, miscellaneous soil, and other high compressive soil layers in the soil layer. The so-called waste soil refers to the accumulation of construction waste and industrial waste with stable performance. Local soft ground refers to the weak zone caused by the weakness of the natural soil layer, the unevenness of the hard thickness, the artificial dark pond ditch, and the accumulation of thick and thin layers of accumulated sediments in the river course.