根式沉井基础竖向承载力自平衡试验研究

Self-Balanced Load Test Study of Vertical Bearing Capacity of Root Type Caisson Foundation

根式沉井基础是通过在普通沉井井壁增加根键,利用根键带动基础周围大范围土体承担基础顶部荷载,使其承载力得以提高。为研究其竖向承载特性,并与普通沉井基础进行承载力对比,考察根键对于竖向承载力提高程度,对根式沉井基础及顶入根键前的普通沉井基础进行竖向承载力自平衡试验研究。试验结果表明,根键对提高沉井基础竖向承载力效果明显。

The root type caisson is a one stemming from the common caisson, to the wall of the latter the root studs are added. The studs are used to drive the large range soil around the caisson to better bear the load atop the caisson and to eventually improve the bearing capacity of the caisson. To study the vertical bearing behavior of the root type caisson foundation and to compare the bearing capacity of the foundation to that of the common caisson foundation, the degrees of the vertical bearing capacity improved by the root studs are investigated and the self-balanced load tests are made as well for both the vertical bearing capacity of the root type and common caisson foundations. The results of the tests indicate that the effect of the vertical bearing capacity of the caisson foundation improved by the studs is significant.