单个围桩-土耦合抗滑结构的土压力试验分析

针对新型桩-土耦合抗滑结构的工作机理研究,通过常规室内模型试验,采用土压力盒等应力测试手段,分析耦合结构中各围桩在滑体中的应力变化。结果表明:黏性土滑坡体中,采用围桩间距为4倍桩径,呈正六边形布置的耦合结构,锚固深度为桩长的2/5,在滑坡推力作用下,抗滑段内各围桩后土压力近似呈抛物线分布,在滑面以上约桩长的10%附近出现最大值。各围桩与桩中土压力值大致相等,围桩与桩间土体能够形成桩土耦合体共同来抵抗外荷载。锚固段内土压力值普遍较小,大致呈三角形分布,为讨论这种耦合结构的计算理论提供依据。

Experimental study on earth pressure of single surround pile-soil coupled anti-slide structure

To examine the coupled anti-slide structure of surround pile-soil’s working mechanism,normal indoor model test and stress testing by soil pressure box are used to analyze the stress change on coupling structure of each surrounding pile in landslide.Results show that in cohesive soil landslide,using the surrounding pile spacing is 4 times the pile diameter,hexagonal arrangement coupled structure,anchorage depth of pile length 2/5,anti-slide pile earth pressure behind the surround pile is approximately parabolic distribution in the landslide thrust,on the surface above the pile length of 10% occur maximum,soil stress value approximately equal at surrounding pile and in the middle of structure,between pile and around pile soil can form pile-soil coupling body to resist external load,anchoring inner soil pressure value is generally small,with roughly triangular distribution.It is hoped that paper can provide the basis for this coupling pile-soil structure calculation theory.