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在膨胀土地基下伏采空区上修筑高速公路必须解决膨胀土与采空区两大地质难题。采用高密度电法+浅层地震法综合物探与钻探相结合进行采空区勘察,查明膨胀土下伏采空区的深度、范围及工程特性,并开展膨胀土的土性试验;在对采空区稳定性的评价分析的基础上,用FLAC3D建模计算出采空区的最大沉降与水平移动变形;有针对性地提出强夯+加筋法等综合处治方法对膨胀土下伏采空区进行处治。实践结果表明该处理方法的效果较好,达到了处治目的。
It is necessary to solve the two major geological problems of expansive soil and goaf in the construction of freeway on gob over expansive soil. The combination of high-density electrical method and shallow seismic method combined geophysical prospecting and drilling is used to carry out the goaf exploration. The depth, range and engineering characteristics of the gob area under the expansive soil are ascertained, and the soil test of the expansive soil is carried out. Based on the analysis and evaluation of the stability of the goaf, the maximum settlement and horizontal displacement of the goaf are calculated by FLAC3D modeling. The comprehensive treatment methods such as dynamic compaction and reinforcement are pointed out, Empty area for treatment. The result of practice shows that the treatment effect is better and the treatment goal is reached.