高切坡超前支护桩与坡体共同作用分析

针对高切坡施工常常导致边坡失稳破坏,诱发滑坡发生的现象,提出采用超前支护桩整治不稳定高切坡的设计理论。采用解藕方法研究了超前支护桩与开挖坡体之间的相互作用机制,其中高切坡开挖面采用弹性理论分析；超前支护桩采用可以考虑桩侧向土体屈服的弹塑性理论进行桩的内力理论解,根据两者之间荷载变形关系建立联系求解,为高切坡超前支护桩的设计提供依据。结果表明：桩土相互作用力大于常规主动土压力,与边坡开挖量、开挖高度、支护桩的刚度以及土体性质等因素密切相关。

Interaction of Pre-reinforced Pile-soil of High Cutting Slope

Slope failures or even landslides are often triggered by improper excavation in high slopes construct. The pre-reinforced pile is presented to use to reinforced high cutting slope. In this paper,the interaction mechanism of pile/soil is study according to uncouple method,the deformation of the high cutting is calculated using elastictheo- ry,and the deformation of the pre-reinforced pile is computed used elastic-plastic theory take account on,then to build the equation groups according the load and deformation relation. The analysis demonstrates that the respond of pile/slope is controlled by cutting amount,high of slope,stiffness of pile as well as soil property,and the distribu- ted load along pile is more high than general active pressure.