抗滑短桩支护土坡的试验研究

Experimental Study on Soil Slope Supported by Short Anti-sliding Piles

为探究不同长度的抗滑短桩对坡土的支护效果,采用单排抗滑短桩加固无黏性土边坡,抗滑短桩桩长L=0(无抗滑短桩)、18、28、43 cm,开展了天然工况下牵引式滑坡模型试验;分析了模型侧壁观测土条和坡土内小块体的位移变化特征与坡土滑移面的分布规律,研究了不同长度的抗滑短桩对土坡的支护作用机理。结果表明:抗滑短桩能有效加固深层土体;随着抗滑短桩长度的增加,加固的土体范围逐渐增加,滑移面向上抬升;当抗滑短桩长度达到一定值后,滑移面的上移速率开始降低。建议:在实际工程中,应联合使用抗滑短桩与坡脚挡墙以同时加固深层土体及浅层坡土,确保整个边坡达到稳定安全状态。

In order to explore the supporting effect of short anti-sliding piles with different lengths on slope soil,the model test of tractive landslide under natural condition was carried out.The non-cohesive soil slope was reinforced by single row anti-sliding short piles.The length of short anti-sliding piles L equals 0(no short anti-sliding piles),18,28 and 43 cm respectively.Based on the analysis of the displacement characteristics of the model sidewall observation soil strips and small blocks in the slope soil and the distribution law of the slope soil slip surface,the support mechanism of the short anti-sliding piles with different pile length on the soil slope was studied.The results show that the short anti-sliding piles can effectively reinforce deep soil.With the increase of the length of short anti-sliding piles,the thickness of the reinforced soil gradually increases,and the slip surface gradually rises.When the length of the short anti-sliding pile reaches a certain value,the rising rate of the slip surface begins to decrease.In practical engineering,it is suggested that anti-sliding short piles and toe retaining wall should be used together to reinforce deep soil and shallow slope soil,so as to ensure the stability and safety of the whole slope.