| 基于离散元和有限差分耦合算法的崩塌体和结构碰撞预测分析 |
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| 引用本文： | 孙新坡,何思明,刘恩龙,苏有文.基于离散元和有限差分耦合算法的崩塌体和结构碰撞预测分析[J].工程力学,2014,31(12):32-39. |
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| 作者姓名： | 孙新坡 何思明 刘恩龙 苏有文 |
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| 作者单位： | 1.西南科技大学土建学院,四川 绵阳 621010; |
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| 基金项目： | 国家自然科学基金项目(41472325);西南科技大学博士基金项目(12zx7124) |
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| 摘 要： | 采用离散元和有限差分耦合计算方法,对龙洞子崩塌挡墙结构碰撞进行了预测分析。构建了3种崩塌挡墙结构模型,并进行了数值模拟。崩塌体由颗粒模拟,挡墙分别由刚性墙、颗粒、FLAC中的实体单元模拟。基于离散元和有限差分耦合算法的数值模拟,分析了不同模型的挡墙动力响应和变形。通过数值模拟结果的对比分析,选出了最优的结构模型和参数,为有效防御崩塌的防护结构设计提供理论依据。
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| 关 键 词： | 崩塌 离散元方法 有限差分方法 耦合算法 压缩试验 |
| 收稿时间： | 2013-09-28 |
PREDICTION ANALYSIS FOR IMPACT OF COLLAPSE BODIES ON STRUCTURES BASED ON UNIFIED DISCRETE ELEMENT AND FINITE DIFFERENCE NUMERICAL SIMULATION |
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| Affiliation: | 1.Southwest University of Science and Technology, Mianyang, Sichuan 621010, China;2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;3.College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China |
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| Abstract: | A method was developed, coupling the discrete element method (DEM) and finite difference method (FDM), and used to perform prediction analysis on the impact of bodies resulting from landslides on the retaining wall of the Longdongzi Tunnel structure. Three kinds of structure models were constructed and simulated numerically. In the numerical models, the collapse bodies were simulated by the assemblies of particles, the retaining wall was simulated by a rigid wall, particles, and solid elements in FLAC. The simulation results from the coupled computational method were used to analyze the dynamic response and deformation of the retaining wall in the various models. By comparing the numerical results, the optimal structural model and computational parameters were chosen, which provides theoretical guidance for effective collapse prevention for protective structure design. |
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