Experimental studies on the interaction mechanism of landslide stabilizing piles and sandwich-type bedrock
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Zhen Zhong I Rui Yong I Huiming Tang I Changdong Li I Shigui Du
Experimental studies on the interaction mechanism of landslide stabilizing piles and sandwich-type bedrock
Abstract The mechanical properties of stabilizing piles are directly affected by the spatial structure of the bedrock of landslides. To effectively reinforce landslides with a sandwich-type bedrock, the interaction mechanism between manually excavated stabilizing piles and the different types of bedrock must be investigated. The research presents experimental models of manually excavated stabilizing piles for two kinds of sandwich-type bedrock structures, namely hard rock–dominant interlayered bedrock (HDIB) and weak rock– dominant interlayered bedrock (WDIB). Six physical models with different bedrock structure types and dip angles θ were prepared to explore the influence of these two parameters on the pile-bedrock interaction mechanism. The mechanical properties of the pile were investigated based on the monitoring results of the earth pressure distributions against the piles and the bending moment distributions. The embedded section of the pile experiences a rotation subjected to lateral soil movement. The center point of the rotation in the HDIB is at a greater elevation than in the WDIB. The earth pressure in the HDIB appears to increase with dip angle θ but is similar to each other in the WDIB. The pile embedded in the HDIB exhibits flexible behavior, whereas the pile embedded in the WDIB exhibits rigid behavior. With the increase of dip angle θ in the WDIB material, the bending moment steadily rises followed by fluctuation. The maximum bending moment of the embedded section increases with θ. These results provide a basis for improving the design of manually excavated stabilizing piles in sandwich-type bedrock. Keywords Landslide . Stabilizing pile . Model test . Sandwichtype bedrock . Interaction mechanism Introduction The sandwich-type bedrock consists of weak and hard rock layers that form the sandwich composite structure of bedrock (Ma et al. 2020). It commonly exists in Jurassic strata in the Three Gorges Reservoir Area (TGRA), China, as shown in Fig. 1. The Jurassic strata are known as the most slide-prone strata in the TGRA, and the number and volume of the landslides identified in these strata account for 67% and 65% of the total landslides in the TGRA, respectively (Li et al. 2004, Yong et al. 2018, Yao et al. 2020; Tang et al. 2019; Li et al. 2019). As an effective measure of landslide mitigation, stabilizing piles play a significant role in landslide control worldwide. In the past two decades, stabilizing pile designs have been extensively applied. Manually excavated piles are commonly used in the TGRA due to their convenient construction, strong earthquake resistance, and low cost (Zhou et al. 2014; Tang et al. 2016). Unfortunately, stabilizing piles in most of the existing studies are normally assumed to be embedded and fixed into the homogeneous bedrock (Ito and Matsui, 1975; Won et al. 2005; Ashour and Ardalan 2012; Lirer 201
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