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随着城市建设发展的需要,有两种甚至多种开挖深度的深基坑越来越常见,但设计时常按开挖较深侧单边设计,忽略两侧开挖深度不同带来的影响。基于等值梁法,通过改进开挖较浅侧围护结构所受土压力模式,推导了能考虑两侧挖深不同的支撑式围护结构深度计算公式,探讨了基坑开挖的非对称程度对围护结构插入比的影响。结果表明,相比于仅按单边设计,挖深较深侧对挖深较浅侧的推挤作用会使挖深较浅侧围护结构插入比增大,增大的幅度随非对称开挖程度的增加而增大,且挖深较深侧挖深越大,增大效应越显著。工程实例表明,综合考虑两侧挖深差异的影响,比仅按挖深较深侧单边设计更加经济、合理。
With the needs of urban construction and development, there are two or even more kinds of deep foundation pit excavation more and more common, but the design often dig deeper side of the unilateral design, ignoring the impact of different depths of excavation on both sides . Based on the equivalent beam method, by calculating the earth pressure model of the shallow side retaining structure, the depth calculation formula of the support retaining structure with different digging depths on both sides is deduced, and the asymmetry of foundation pit excavation The effect of degree on the insertion ratio of envelope. The results show that the pushing ratio of the deeper side of the digging depth to the shallower side of the digging depth increases the insertion ratio of the retaining structure with the deeper side of digging depth than that of the one with only one side, Increasing the degree of excavation increases, and deeper dig deeper dig deeper, increasing the effect of the more significant. The engineering example shows that it is more economical and reasonable than considering the effect of the difference of excavation depths on both sides of the excavation only deeper than the unilateral design of deeper digging.