The interaction between pile and soft soil of the passive pile group subjected to soil movement was analyzed with three-dimensional finite element model by using ANSYS software. The soil was assumed to be elastic-plas...The interaction between pile and soft soil of the passive pile group subjected to soil movement was analyzed with three-dimensional finite element model by using ANSYS software. The soil was assumed to be elastic-plastic complying with the Drucker-Prager yield criterion in the analysis. The large displacement of soil was considered and contact elements were used to evaluate the interaction between pile and soil. The influences of soil depth of layer and number of piles on the lateral pressure of the pile were investigated, and the lateral pressure distributions on the (2×1) pile group and on the (2×2) pile group were compared. The results show that the adjacent surcharge may result in significant lateral movement of the soft soil and considerable pressure on the pile. The pressure acting on the row near the surcharge is higher than that on the other row, due to the "barrier" and arching effects in pile groups. The passive load and its distribution should be taken into account in the design of the passive piles.展开更多
For the Guanshui Road Station tunnel project of Guiyang Metro Line 2,the wind pavilion group was moved out of the main tunnel to reduce the number of openings in the main tunnel,and the wind pavilion group was excavat...For the Guanshui Road Station tunnel project of Guiyang Metro Line 2,the wind pavilion group was moved out of the main tunnel to reduce the number of openings in the main tunnel,and the wind pavilion group was excavated in a triangular configuration at the entrance of the main tunnel.Based on the finite element software ABAQUS,a three-dimensional model is established to study the influence of different triangular-distribution tunnels excavation schemes on the surface settlement and tunnel stability.The objective of this study is to reveal the change rules of surface settlement,deformation and force in the support structures and the surrounding rock and identify the best excavation scheme for this tunnel configuration.Results show that to control the surface settlement and the deformation of the support structures,the optimal excavation sequence involves excavating the upper fresh air exhaust tunnel before the lower running tunnel.To control the stress of the support structures,the optimal excavation involves excavating the lower running tunnel before the upper fresh air exhaust tunnel.In this project,the most reasonable excavation sequence of the tunnel is from top to bottom.The most reasonable thickness of tunnel penetration is 5 m.展开更多
On ths basis of interaction between faults, a finite element model for Southwest China is constructed,and the stress adjustment due to the strong earthquake occurrence in this region was studied. The preliminary resul...On ths basis of interaction between faults, a finite element model for Southwest China is constructed,and the stress adjustment due to the strong earthquake occurrence in this region was studied. The preliminary results show that many strong earthquakes occurred in the area of increased stress in the model. Though the results are preliminary, the quasi 3D finite element model is meaningful for strong earthquake prediction.展开更多
在线学习群体检测是在新一轮科技革命赋能教育创新变革背景下,依据学习者个性化特征优化教育资源分层配置的关键途径。现有学习趣缘社群在线学习群体的检测主要依赖学习者的直接行为记录和互动指标,较少关注学习者潜在的社交参与水平和...在线学习群体检测是在新一轮科技革命赋能教育创新变革背景下,依据学习者个性化特征优化教育资源分层配置的关键途径。现有学习趣缘社群在线学习群体的检测主要依赖学习者的直接行为记录和互动指标,较少关注学习者潜在的社交参与水平和社群结构。为营造数智环境下学习者画像决策辅助全民自主学习的文化氛围,本文提出一种社交参与视角下超图增强的学习趣缘社群群体检测方法。首先,从影响用户社交参与的维度出发,构建能够体现学习者社交参与水平的特征集。其次,提出超图卷积网络(hypergraph convolutional network,HyperGCN)增强的图聚类算法HG-SDCN(structural deep clustering network based on HyperGCN),解决了利用二分图检测在线学习群体时无法有效捕捉学习者多元交互关系和高阶结构的问题。最后,从真实学习趣缘社群收集数据,验证本文提出方法的检测效果。与基线相比,本文方法在Acc(accuracy)、F1、NMI(normalized mutual information)和ARI(adjusted Rand index)等评价指标上分别提升了16.16、9.77、16.01和22.14个百分点。上述结果不仅证明了HyperGCN在捕捉学习者高阶结构实现在线学习群体检测任务中的有效性,还为未来从社交参与维度制定调整个性化教育资源配置策略提供了方法和理论支撑。展开更多
选择合适的海上风力发电机机型对海上风电场的长期高效运行起着至关重要的作用。针对决策者在风机选型决策过程中存在不确定性和主观偏好等问题,提出一种改进的多准则决策(multi-criteria decision making, MCDM)框架及方法:在权重求解...选择合适的海上风力发电机机型对海上风电场的长期高效运行起着至关重要的作用。针对决策者在风机选型决策过程中存在不确定性和主观偏好等问题,提出一种改进的多准则决策(multi-criteria decision making, MCDM)框架及方法:在权重求解算法中将群体决策和直觉模糊数与层次分析法相结合,提出群体直觉模糊层次分析法(group intuitionistic fuzzy analytic hierarchy process, GIAHP)计算指标权重;在备选方案排序算法中将余弦距离引入接近理想点法(technique for order preference by similarity to an ideal solution, TOPSIS),提出多距离TOPSIS确定备选方案排序。最后以山东省海上风电场风机选型为例,并通过敏感性分析验证框架及方法的鲁棒性。该框架及方法为中国海上风电场风机选型提供理论依据,可确保海上风电场长期稳定运行。展开更多
基金Project(50378036) supported by the National Natural Science Foundation of China
文摘The interaction between pile and soft soil of the passive pile group subjected to soil movement was analyzed with three-dimensional finite element model by using ANSYS software. The soil was assumed to be elastic-plastic complying with the Drucker-Prager yield criterion in the analysis. The large displacement of soil was considered and contact elements were used to evaluate the interaction between pile and soil. The influences of soil depth of layer and number of piles on the lateral pressure of the pile were investigated, and the lateral pressure distributions on the (2×1) pile group and on the (2×2) pile group were compared. The results show that the adjacent surcharge may result in significant lateral movement of the soft soil and considerable pressure on the pile. The pressure acting on the row near the surcharge is higher than that on the other row, due to the "barrier" and arching effects in pile groups. The passive load and its distribution should be taken into account in the design of the passive piles.
基金Projects(B200204032,2019B07914)supported by the Fundamental Research Funds for the Central Universities,ChinaProjects(51878667,51678571,51808193)supported by the National Natural Science Foundation of China。
文摘For the Guanshui Road Station tunnel project of Guiyang Metro Line 2,the wind pavilion group was moved out of the main tunnel to reduce the number of openings in the main tunnel,and the wind pavilion group was excavated in a triangular configuration at the entrance of the main tunnel.Based on the finite element software ABAQUS,a three-dimensional model is established to study the influence of different triangular-distribution tunnels excavation schemes on the surface settlement and tunnel stability.The objective of this study is to reveal the change rules of surface settlement,deformation and force in the support structures and the surrounding rock and identify the best excavation scheme for this tunnel configuration.Results show that to control the surface settlement and the deformation of the support structures,the optimal excavation sequence involves excavating the upper fresh air exhaust tunnel before the lower running tunnel.To control the stress of the support structures,the optimal excavation involves excavating the lower running tunnel before the upper fresh air exhaust tunnel.In this project,the most reasonable excavation sequence of the tunnel is from top to bottom.The most reasonable thickness of tunnel penetration is 5 m.
文摘On ths basis of interaction between faults, a finite element model for Southwest China is constructed,and the stress adjustment due to the strong earthquake occurrence in this region was studied. The preliminary results show that many strong earthquakes occurred in the area of increased stress in the model. Though the results are preliminary, the quasi 3D finite element model is meaningful for strong earthquake prediction.
文摘在线学习群体检测是在新一轮科技革命赋能教育创新变革背景下,依据学习者个性化特征优化教育资源分层配置的关键途径。现有学习趣缘社群在线学习群体的检测主要依赖学习者的直接行为记录和互动指标,较少关注学习者潜在的社交参与水平和社群结构。为营造数智环境下学习者画像决策辅助全民自主学习的文化氛围,本文提出一种社交参与视角下超图增强的学习趣缘社群群体检测方法。首先,从影响用户社交参与的维度出发,构建能够体现学习者社交参与水平的特征集。其次,提出超图卷积网络(hypergraph convolutional network,HyperGCN)增强的图聚类算法HG-SDCN(structural deep clustering network based on HyperGCN),解决了利用二分图检测在线学习群体时无法有效捕捉学习者多元交互关系和高阶结构的问题。最后,从真实学习趣缘社群收集数据,验证本文提出方法的检测效果。与基线相比,本文方法在Acc(accuracy)、F1、NMI(normalized mutual information)和ARI(adjusted Rand index)等评价指标上分别提升了16.16、9.77、16.01和22.14个百分点。上述结果不仅证明了HyperGCN在捕捉学习者高阶结构实现在线学习群体检测任务中的有效性,还为未来从社交参与维度制定调整个性化教育资源配置策略提供了方法和理论支撑。
文摘选择合适的海上风力发电机机型对海上风电场的长期高效运行起着至关重要的作用。针对决策者在风机选型决策过程中存在不确定性和主观偏好等问题,提出一种改进的多准则决策(multi-criteria decision making, MCDM)框架及方法:在权重求解算法中将群体决策和直觉模糊数与层次分析法相结合,提出群体直觉模糊层次分析法(group intuitionistic fuzzy analytic hierarchy process, GIAHP)计算指标权重;在备选方案排序算法中将余弦距离引入接近理想点法(technique for order preference by similarity to an ideal solution, TOPSIS),提出多距离TOPSIS确定备选方案排序。最后以山东省海上风电场风机选型为例,并通过敏感性分析验证框架及方法的鲁棒性。该框架及方法为中国海上风电场风机选型提供理论依据,可确保海上风电场长期稳定运行。
