作为西南山区最为频发的地质灾害之一,滑坡对山区中大量存在的砖混房屋造成严重影响,尤其农村山区中受灾最为严重,给人民群众生产生活造成巨大安全隐患.研究滑坡引起的上部砖混结构变形特征,对科学指导房屋设计防护及灾后监测点布置具...作为西南山区最为频发的地质灾害之一,滑坡对山区中大量存在的砖混房屋造成严重影响,尤其农村山区中受灾最为严重,给人民群众生产生活造成巨大安全隐患.研究滑坡引起的上部砖混结构变形特征,对科学指导房屋设计防护及灾后监测点布置具有重要现实意义.本文以酉阳高园子滑坡为例,通过现场调查和裂缝参数拟合研究了滑坡区砖混结构变形破坏特征.同时基于PFC3D,构建了有限体积-离散元(Finite Volume Method-Discrete Element Method,FVM-DEM)滑坡-房屋单向耦合模型,模拟并分析了在不同工况下滑坡动态发育过程,进一步揭示了房屋裂缝产生及演化过程.结果表明:相比于普通无柱砖混结构,底框结构抵抗滑坡诱发变形破坏的能力更强,并且处于前后缘段的房屋相对中段房屋更易出现损伤破坏;房屋的长宽比不宜过小,布置房屋长边走向平行斜坡走向有利于减少滑坡对房屋造成的破坏.本文总结了在滑坡作用下,上部砖混结构的变形特征和裂缝开展规律,可为农村山区砖混结构设计和布置提供参考.展开更多
Gas-liquid-solid three-phase flow is common in various fields,making it crucial to accurately and efficiently describe its dynamic behaviors.To better perform the gas-liquid-solid three-phase simulations,a coupling co...Gas-liquid-solid three-phase flow is common in various fields,making it crucial to accurately and efficiently describe its dynamic behaviors.To better perform the gas-liquid-solid three-phase simulations,a coupling code based on GPU named as CoSim-FVDEM is developed,which combines the finite volume method(FVM)and the discrete element method(DEM).This code encompasses unresolved,resolved and resolved-unresolved coupling methods,making it suitable for three-phase flow simulations involving solid particles of various sizes.A series of cases are conducted to validate the accuracy of the developed coupling algorithm,including complex dam breach flow,water entry test of a single sphere and multi-sphere within rotating roller.Finally,a gas-liquid-solid three-phase flow numerical experiment is performed,which involves the bi-disperse granular systems in a rotating roller.Base on the numerical results,the dynamic behaviors of the three-phase flow are analyzed and the computational efficiency is evaluated.The results indicate that the developed coupling code can better be used for the dynamic analysis of large-scale gas-liquid-solid three-phase flow.展开更多
文摘作为西南山区最为频发的地质灾害之一,滑坡对山区中大量存在的砖混房屋造成严重影响,尤其农村山区中受灾最为严重,给人民群众生产生活造成巨大安全隐患.研究滑坡引起的上部砖混结构变形特征,对科学指导房屋设计防护及灾后监测点布置具有重要现实意义.本文以酉阳高园子滑坡为例,通过现场调查和裂缝参数拟合研究了滑坡区砖混结构变形破坏特征.同时基于PFC3D,构建了有限体积-离散元(Finite Volume Method-Discrete Element Method,FVM-DEM)滑坡-房屋单向耦合模型,模拟并分析了在不同工况下滑坡动态发育过程,进一步揭示了房屋裂缝产生及演化过程.结果表明:相比于普通无柱砖混结构,底框结构抵抗滑坡诱发变形破坏的能力更强,并且处于前后缘段的房屋相对中段房屋更易出现损伤破坏;房屋的长宽比不宜过小,布置房屋长边走向平行斜坡走向有利于减少滑坡对房屋造成的破坏.本文总结了在滑坡作用下,上部砖混结构的变形特征和裂缝开展规律,可为农村山区砖混结构设计和布置提供参考.
基金supported by the projects of National Natural Science Foundation of China(grant Nos.52479102 and 52079067).
文摘Gas-liquid-solid three-phase flow is common in various fields,making it crucial to accurately and efficiently describe its dynamic behaviors.To better perform the gas-liquid-solid three-phase simulations,a coupling code based on GPU named as CoSim-FVDEM is developed,which combines the finite volume method(FVM)and the discrete element method(DEM).This code encompasses unresolved,resolved and resolved-unresolved coupling methods,making it suitable for three-phase flow simulations involving solid particles of various sizes.A series of cases are conducted to validate the accuracy of the developed coupling algorithm,including complex dam breach flow,water entry test of a single sphere and multi-sphere within rotating roller.Finally,a gas-liquid-solid three-phase flow numerical experiment is performed,which involves the bi-disperse granular systems in a rotating roller.Base on the numerical results,the dynamic behaviors of the three-phase flow are analyzed and the computational efficiency is evaluated.The results indicate that the developed coupling code can better be used for the dynamic analysis of large-scale gas-liquid-solid three-phase flow.
