承压水作用下圆形基坑底板突涌的临界厚度计算公式

随着地下空间开发利用规模的加大,圆形超深基坑开始较多的出现,承压水作用下的基坑底板突涌往往成为这类基坑的重要问题,传统的计算方法忽略了土体自身的强度和基坑的平面形状和尺寸,该文假设基坑底板土体为具有一定强度的弹性体,将圆形基坑隔水土层简化为一受均布荷载的周边固定的圆形薄板,运用弹性薄板理论,就圆形基坑底板突涌的临界厚度计算问题进行探讨,提出了底板剪切型和挠曲型破坏的判别式,并就其规律进行了分析。

Critical Thickness Analysis of Base Plate Gushing in Cylindrical Foundation Pit with Confined Water

With the scale of utilizing underground space growing,the specially deep cylindrical foundation pit becomes more and more to construct,the gushing of base plate with confined water is an important problem in excavation.The conventional method neglected the strength of soil body and the shape and size of excavation.In the paper the layer of soil body is assumed as an elastic body possessing mechanics intensity,the layer of soil with confined water is simplified as a fixed roundness edged plate with a uniform load,by means of the theory of elastic sheet the paper analyses the critical thickness of the layer of soil with confined water in the cylindrical foundation pit is calculated and puts forward discrimination of shearing and bending distortion for base plate.