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云南省蒙自地区的膨胀土危害频繁,是我国膨胀土危害最严重的地区之一。在充分认识膨胀土的特点、膨胀土的分布范围及基坑周边环境后,对基坑支护结构设计中力学参数的合理取值,水平膨胀力的影响,基坑变形特点,以及土方开挖、防排水、监测等措施方面进行分析。膨胀土场地的深基坑支护设计采用放坡+桩锚的基坑支撑体系是可行的。具有稳定性好、变形小、投入少,在多指标考察下综合效益最优的特点,对膨胀土地区深基坑支护的设计及施工能提供一定的参考和指导。
Expansive soil in Mengzi area of Yunnan Province is more harmful than ever before and it is one of the areas hardest hit by the expansive soil in China. After fully understanding the characteristics of expansive soils, the distribution range of expansive soils and the surrounding environment of foundation pits, the reasonable value of mechanical parameters, the influence of horizontal expansive force, the deformation characteristics of foundation pits and the earth excavation , Drainage, monitoring and other measures for analysis. It is feasible to design the foundation pit supporting system of expansive soil site by grading + pile anchor. It has the characteristics of good stability, small deformation, less investment and optimum comprehensive benefit under the multi-index inspection. It can provide reference and guidance for the design and construction of deep foundation pit support in expansive soil area.