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由于目前对双排桩土拱效应的研究还处于起步阶段,该文采用FLAC3D软件对双排桩土拱效应进行研究。分析双排桩土拱的形成和发育机理,并采用单因素变化法研究了不同影响因素(如滑坡推力、土体性质、桩间距等)对双排桩土拱效应的影响。研究结果表明:在滑坡推力作用下,双排桩会先在后排桩形成土拱效应,然后逐渐传递到前排桩,形成多层土拱效应;不同的影响因素对土拱效应影响性质不同,如:黏聚力、内摩擦角和相对弹性模量对土拱效应起正相关,桩间距、泊松比等起负相关;剪胀角对土拱效应的影响不太明显。
Due to the current research on the double-row pile arching effect is still in its infancy, FLAC3D software is used to study the double-row pile arching effect. The formation and development mechanism of double-row pile arches were analyzed. The influence of different influencing factors (such as landslide thrust, soil properties and pile spacing) on the arching effect of double row piles was studied by single factor variation method. The results show that under the thrust of landslide, the double-row piles will first form the arching effect in the back piles and then gradually pass to the front piles to form the multi-layer soil arching effect. The different influencing factors have different effects on the soil arching effect , Such as: cohesion, internal friction angle and relative elastic modulus have a positive correlation with soil arching effect, and pile spacing, Poisson’s ratio and so on have a negative correlation; dilatancy angle has little effect on soil arching effect.