抗滑桩的模型试验及作用在桩上的下滑力计算方法的探讨

THE MODEL TESTS OF STABILIZING PILES AND A METHOD OF CALCULATING SLIDING FORCE ACTING ON STABILIZING PILES

抗滑桩作为一种新兴支挡结构用以整治滑坡,已收到了良好的效果。但是抗滑桩的工作机理还未彻底弄清楚,计算理论仍不完善。目前人们主要是通过现场试验及室内模型试验,来对抗滑桩进行研究,而室内模型试验几乎都是在砂土中进行的,在粘性土中,国内还没有做过试验,国外也很少,本文通过饱和软粘土中抗滑桩(相对试验土体来说为刚性桩)的模型试验,研究抗滑桩的工作机理。试验测定了几种桩间距时作用在桩上的下滑力,作者根据试验所得到的随着桩间距减小桩上所受到的下滑力增大的规律,提出了一种计算下滑力的方法。按此方法分别对本文的粘土模型试验及铁道部第二勘测设计院的砂土模型试验中的抗滑桩所受到的下滑力进行计算,并将计算值与实测值进行比较,结果表明两组数值吻合良好。

Stabilizing piles, which are new types of supporting structures to stabilize landslides, have got obviously economic effect, but so far, the mechanism of stabilizing piles is not completely realized and its calculating theories have not been pefect yet. Now, people study stabilizing piles through indoor and outdoor model tests, however, most of the model tests are carried out in sand medium and few in clay medium. In this paper, a series of model tests are carried out for several piles′ intervals in saturated soft clay in order to study the mechanism of stabilizing piles and sliding earth pressure acting on stabilizing piles. The. author presents a method of calculating sliding earth pressure acting on stabilizing piles. Both the experimental values in saturated soft clay and the ones in sand are compared with their correspondence theoritical calculating values, and the results express that there are good ageements between the theoritical calculating values and experimental ones.