非对称开挖基坑支撑式围护结构解析解
发布时间：2018-11-25 13:25
【摘要】：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。
[Abstract]:With the development of urban construction, it is more and more common for deep excavation with two or more kinds of excavation depth, but the design is often designed according to the deep side of excavation, ignoring the influence of different excavation depth on both sides. Based on the equivalent beam method, by improving the earth pressure model of shallow side retaining structure, a formula for calculating the depth of braced retaining structure with different excavation depth on both sides is derived. The influence of the asymmetry degree of excavation on the insertion ratio of retaining structure is discussed. The results show that, compared with the one-sided design, the pushing and squeezing effect of the deeper side to the shallow side will increase the insertion ratio of the shallow side of the excavation, and the amplitude of the increase will increase with the increase of the degree of asymmetric excavation. The larger the depth, the greater the effect. The engineering example shows that it is more economical and reasonable to consider comprehensively the influence of dipping difference between two sides than the unilateral design only by deep side.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;华东交通大学土木建筑学院;
【基金】：973项目(No.2015CB057801) 江西省落地计划成果转化项目(No.KJLD4036)~~
【分类号】：TU473
[Abstract]:With the development of urban construction, it is more and more common for deep excavation with two or more kinds of excavation depth, but the design is often designed according to the deep side of excavation, ignoring the influence of different excavation depth on both sides. Based on the equivalent beam method, by improving the earth pressure model of shallow side retaining structure, a formula for calculating the depth of braced retaining structure with different excavation depth on both sides is derived. The influence of the asymmetry degree of excavation on the insertion ratio of retaining structure is discussed. The results show that, compared with the one-sided design, the pushing and squeezing effect of the deeper side to the shallow side will increase the insertion ratio of the shallow side of the excavation, and the amplitude of the increase will increase with the increase of the degree of asymmetric excavation. The larger the depth, the greater the effect. The engineering example shows that it is more economical and reasonable to consider comprehensively the influence of dipping difference between two sides than the unilateral design only by deep side.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;华东交通大学土木建筑学院;
【基金】：973项目(No.2015CB057801) 江西省落地计划成果转化项目(No.KJLD4036)~~
【分类号】：TU473
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