基于物理模型试验的滑坡-抗滑桩位移场变化特征

Model test on the displacement field characteristics of the landslide stabilizing piles

滑坡-抗滑桩体系演化机理是滑坡灾害防治的重要理论基础,其中桩土相互作用是滑坡-抗滑桩体系中的关键,而位移场是相互作用的重要表征之一,因此,对滑坡-抗滑桩体系位移场的研究具有十分重要的工程意义。以物理模型试验为手段,基于三峡库区堆积层滑坡工程地质特征,建立大型物理试验模型,通过逐级施加荷载来模拟滑坡后缘推力,采用高速摄像机及粒子图像测速技术等获取滑坡坡表与桩顶位移数据,定量分析了体系位移场变化特征。试验结果显示:在滑坡-抗滑桩体系演化过程中,坡表位移场变化呈现出很好的规律性,这为桩土相互作用研究机理起到了一定的推动作用。

The evolution mechanism of landslide anti-slide pile system is an important theoretical basis for landslide hazard prevention.Pile-soil interaction is the key of landslide anti-slide pile system,and displacement field is one of the important symbols of interaction.Therefore,the study of displacement field of landslide anti-slide pile system is of great significance in the field of engineering.Based on the engineering geological characteristics of accumulation landslide in Three Gorges Reservoir area,a large-scale physical test model is established.The thrust of the rear edge of the landslide is simulated by applying load step by step.The displacement data of the landslide slope surface and the top of the piles are obtained by using high-speed video camera and particle image velocity technology,and the variation characteristics of the displacement field of the system are quantitatively analyzed.The test results show that the displacement field presents a good regularity in the evolution process,which plays a certain role in promoting the research on the mechanism of pile-soil interaction.