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介绍了在软土地基中,首次利用真空预压与遮帘桩的共同作用进行深基坑支护的新工法试验研究情况。结果表明,该工法垂直支护深度至少可达到地面以下7.5m;真空预压中采用直排式代替常规的通道设计,不仅大大提高了负压荷载在土中的传递效率,同时在基坑垂直开挖面上形成了预期的大气支护压力;基坑外侧一定深度范围内设置的遮帘桩,在基坑开挖形成临空面时抵挡了一部分侧向土压力,增加了基坑支护安全储备。
This paper introduces the experimental research on the new method of supporting deep foundation pit in the soft soil foundation by using the vacuum preloading together with the blind piling for the first time. The results show that the vertical support depth of this method can reach at least 7.5m below the ground. In the vacuum preloading, instead of the conventional channel design, vertical displacement not only greatly improves the transmission efficiency of the negative pressure load in the soil, The expected pressure of atmospheric support is formed on the excavation surface. The blind piles set within a certain depth outside the foundation pit resist part of the lateral earth pressure when the excavation of the foundation pit forms a temporary empty surface, and increase the support of the foundation pit Safety reserve.