软土地区坑中坑式基坑工程的变形特性研究

通过翻阅大量的文献,采集、整理、研究大量有关坑中坑式基坑工程的变形数据,对内、外坑开挖深度、间距,围护结构侧向变形值等有关参数之间关系进行分析,结果表明:当开挖总深度不变时,外坑围护结构最大侧向变形随内外坑间距的增大而减小,内坑围护结构最大侧向变形随内外坑间距的增大而增大;内墙插入比对外坑围护结构最大侧向变形量的影响不大,但内坑围护结构最大侧向变形量随内墙插入比的增大而减小。外坑围护结构最大侧向变形量随外墙插入比的增加有减小的趋势。在忽略内坑影响的情况下,外坑开挖深度与地表最大沉降量之间的关系类似,考虑内坑影响时周围地表沉降量相比单级基坑更大,同时内坑的开挖深度与地表最大沉降量不再符合单基坑的线性规律。

Study on deformation characteristicsof pit in pit foundation pit in soft soil area

through reading a large number of literature,collecting,sorting out and studying a large number of deformation data of pit foundation pit engineering,the relationship between internal and external pit excavation depth,spacing,lateral deformation value of envelope structure and other related parameters is analyzed.The results show that when the total excavation depth remains unchanged,the maximum lateral deformation of outer pit enclosure structure decreases with the increase of pit spacing.The maximum lateral deformation of the inner pit envelope increases with the increase of the pit spacing.The maximum lateral deformation of the inner wall is less than that of the external pit envelope,but the maximum lateral deformation of the inner pit envelope decreases with the increase of the insertion ratio of the inner wall.The maximum lateral deformation of the outer pit envelope tends to decrease with the increase of the insertion ratio of the external wall.When the influence of the inner pit is ignored,the relationship between the excavation depth of the outer pit and the maximum settlement of the surface is similar.When the influence of the inner pit is considered,the surrounding surface settlement is larger than that of the single stage foundation pit.At the same time,the excavation depth of the inner pit and the maximum settlement of the surface are no longer in accordance with the linear law of the single foundation pit.