工程地质学报2019，Vol.27Issue(1)：123-133,11.DOI:10.13544/j.cnki.jeg.2019-004
落石冲击荷载作用下的桩板拦石墙结构动力响应
DYNAMIC RESPONSE OF PILE-PLATE ROCK RETAINING WALL UNDER IMPACT OF ROCKFALL
摘要
Abstract
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 pileplate 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-1and 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.关键词
桩板拦石墙/落石/数值模拟/动力响应/混凝土损伤Key words
Pile-plate retaining wall/Rockfall/Numerical simulation/Dynamic response/Concrete damage分类
天文与地球科学引用本文复制引用
胡卸文,梅雪峰,杨瀛,罗刚,吴建利..落石冲击荷载作用下的桩板拦石墙结构动力响应[J].工程地质学报,2019,27(1):123-133,11.基金项目
国家自然科学基金 (41672283, 41731285) （41672283, 41731285）
四川省自然资源厅"8.8"九寨沟地震灾区生态化地质灾害防治重大科技支撑研究课题 (KJ-2018-20) 资助 （KJ-2018-20）
