| As the special geology property of alluvial-lacustrine deposits plain along the Yellow River, there often exists the different thickness soft-weak soil layer under the roadbed along the road, which affect the highway's long-term stability and safety usage. Study on the foundation treatment technique and settlement problem of alluvial-lacustrine deposits plain's soft-weak soil is essential to the road way construction of area along the Yellow River.On the base of extensive geological, hydrological survey and soil experiment for the soft-weak soil along the Yin Chuan Ring Expressway, the paper studies and summarize the structure property and engineering property of alluvial - lacustrine deposits plain's soft-weak soil; And analyses and studies the applicability, reinforce mechanism, design method, construction technology and related construction parameters of three treatment methods, such as, Replacement of the Gravel Cushion, Sand-wick, Gravel Compaction Pile; Then, through the geotechnical centrifuge model tests, the paper studies the settlement rules of the foundation treated by three treatment methods, analyses the treatment effect, optimizes the design parameters, predicts the final settlement of the soft-weak foundation; And through monitoring construction settlement, soil horizontal displacement, pore water pressure etc., the paper gives a economical analysis of the Yin Chuan Ring Expressway's soft-weak foundation treatment effect.Finally, the results shows: three treatment methods, Replacement of the Gravel Cushion, Sand-wick, Gravel Compaction Pile have been adopted, which can reinforce alluvial -lacustrine deposits plain's soft-weak foundation and reduce settlement, they are reasonable and effective methods to deal with the foundation.At the same time, the treatment methods of alluvial-lacustrine deposits plain's soft-weak foundation is put forward and it can guide expressway construction on this area for later.
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