Model test on the displacement field characteristics of the landslide stabilizing piles
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摘要: 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。Abstract: 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.
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图 3 滑坡模型表面的示踪点布控图
Figure 3. Control map of tracing points on the surface of landslide model
图 4 水平荷载和监测点位移随时间变化曲线
Figure 4. Time-dependent curves of horizontal load and displacement of the monitoring points
图 5 监测点57水平速度随时间变化曲线
Figure 5. Time-dependent curves of horizontal velocity of monitoring point 57
图 7 不同时刻抗滑桩及桩周土体位移矢量图
Figure 7. Displacement vectograph of anti-slide piles and surrounding soils at different times
图 8 不同时刻抗滑桩及周围土体水平位移等值线图
Figure 8. Horizontal displacement contours of anti-slide piles and surrounding soils at different times
表 1 模型材料的相关参数
Table 1. Relevant parameters of model materials
项目 容重/(kN·m-3) 黏聚力/kPa 摩擦角/(°) 滑体 22.1 5.6 23.8 滑带 17.1 3.9 18.1 
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