土塞效应在基坑工程中的研究与应用

Study and Application of Soil Plug Effect in Foundation Pit Engineering

摘要:

狭小面积的基坑在平面与坑深尺寸上类似于沉井、沉箱等施工方法，但基坑围护桩插入土体的深度远高于沉井的设计要求。实际上，狭小的基坑在坑底可以形成相对紧致的土塞，该部分土体在受挤压后可以为基坑围护桩提供较大的被动土压力，对基坑整体稳定属于有利作用。通过对该类型基坑的土塞效应进行理论分析和数值计算，并通过工程案例进行了验证，对类似工程的应用有一定借鉴意义。

Abstract:

The foundation pit of narrow area is similar to the construction method of open caisson and caisson in terms of plane and pit depth. But the depth of pit enclosing pile into soil is much higher than the design requirements of caisson. In practice, the narrow foundation pit can form the relatively compacted soil plug at the pit bottom. This part of soil after compacted can provide the larger passive earth pressure on the enclosing pile of foundation pit, which is beneficial to the overall stability of foundation pit. The theoretical analysis and numerical calculation are carried out through the soil plug effect of this kind of foundation pit. And the verification is carried out through the engineering examples. The certain of reference is provided for the application of similar projects.