HU Xiewen, MEI Xuefeng, YANG Ying, LUO Gang, WU Jianli. 2019: DYNAMIC RESPONSE OF PILE-PLATE ROCK RETAINING WALL UNDER IMPACT OF ROCKFALL. JOURNAL OF ENGINEERING GEOLOGY, 27(1): 123-133. DOI: 10.13544/j.cnki.jeg.2019-004
    Citation: HU Xiewen, MEI Xuefeng, YANG Ying, LUO Gang, WU Jianli. 2019: DYNAMIC RESPONSE OF PILE-PLATE ROCK RETAINING WALL UNDER IMPACT OF ROCKFALL. JOURNAL OF ENGINEERING GEOLOGY, 27(1): 123-133. DOI: 10.13544/j.cnki.jeg.2019-004

    DYNAMIC RESPONSE OF PILE-PLATE ROCK RETAINING WALL UNDER IMPACT OF ROCKFALL

    • In view of the difficulty in implementing active reinforcement for the high-level rockfall disaster occurred in the high-steep slope zone of the "5·12" Wenchuan earthquake area in 2008, the pile-plate retaining wall is a passive protection measure used in the proposed interception site, and its applicable terrain slope is 25°~35°. In order to study the dynamic response of such a pile-plate structure under rockfall impact load, numerical simulation is carried out by coupling finite element and infinite element. Combined with the classical elastoplastic theory, the characteristic parameters such as impact force, penetration depth and structural energy dissipation effect of the pile-plate retaining wall during loading and unloading rebound process under different impact conditions are systematically analyzed, and the impact resistance of the structure is clarified. The results show that the "infinite element" boundary can effectively reduce the error caused by the reflection of the stress wave at the artificial truncation boundary. In the case of impact speeds of 10 m·s-1, 15 m·s-1 and 20 m·s-1, 25 m·s-1, the calculated impact forces are 1.9MN, 2.5MN, 3.1MN, 3.7MN, respectively. The results are consistent with the Kawahara model, but larger than the Labiouse model and the Hertz elastic solution. According to the concrete damage theory, the classification of damage level is proposed and the degree of structural damage is effectively quantified. When the impact speed is greater than 20 m·s-1, the pile and plate concrete tensile damage is seriously damaged, and the structure has the risk of completely losing the bearing capacity. The calculation methods and results in this paper can provide practical guidance for the related structural design.
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