基于物理模型试验的多层滑带堆积层滑坡-抗滑桩受力特征

Mechanical characteristics of anti-slide pile of multi-layer sliding zone accumulation layer based on physical model test

研究抗滑桩的受力特征是进行抗滑桩设计工作的关键。我国三峡库区部分堆积层滑坡发育多层滑带,而目前抗滑桩的设计方法仅针对单层滑坡,因此,对多层滑带堆积层滑坡—抗滑桩受力特征的研究具有重要意义。基于三峡库区堆积层滑坡工程地质特征,开展了多层滑带堆积层滑坡物理试验模型,在滑坡的后缘施加推力来模拟滑坡演化过程,同时监测滑坡—抗滑桩体系的多场信息。试验结果表明,在多层滑带堆积层滑坡的演化过程中,桩身受力表现出了很好的规律性。根据坡表位移的变化趋势,将滑坡演化分为4个阶段,在此基础上对桩身受力进行分析。滑坡推力分布图式中出现了4个极大值,土体抗力分布图式中出现唯一最大值,该试验结果为抗滑桩的设计提供了一定的理论支持。

The research on the mechanical characteristics of anti-slide pile is the key to the design of anti-slide pile.In the Three Gorges Reservoir area,there are multi-layer slide belts in some accumulation landslides.However,the current design method of anti-slide pile is only for single-layer landslides.Therefore,the research on the mechanical characteristics of multi-layer slide belt accumulation landslide anti-slide pile is of great significance.Based on the engineering geological characteristics of the accumulation landslide in the Three Gorges Reservoir area,this paper develops a physical test model of the accumulation landslide in the multi-layer sliding belt.The thrust is applied to the rear edge of the landslide to simulate the evolution process of the landslide,and the multi field information of the landslide anti-slide pile system is monitored at the same time.The test results show that in the evolution process of multi-layer slide belt accumulation layer landslide,the stress of pile body shows a good regularity.According to the change trend of slope surface displacement,the landslide evolution is divided into four stages,and on this basis,the pile stress is analyzed.There are two maximum values in the landslide thrust distribution diagram and the only maximum value in the soil resistance distribution diagram.The test results provide some theoretical support for the design of anti-slide pile.