为研究降雨作用下河南省伊川县某滑坡的破坏运动特征分析,利用颗粒离散元软件,采用Ball-Wall法建立1:1数值计算模型并进行模拟计算,得出不同时间步长下的速度与位移云图,并在坡体不同的位置记录坡体运动过程中位移及速度变化的情况。研...为研究降雨作用下河南省伊川县某滑坡的破坏运动特征分析,利用颗粒离散元软件,采用Ball-Wall法建立1:1数值计算模型并进行模拟计算,得出不同时间步长下的速度与位移云图,并在坡体不同的位置记录坡体运动过程中位移及速度变化的情况。研究结果表明:该滑坡整体破坏特征为:中部剪切–前缘牵引–后缘拉裂。表现为蠕滑–拉裂式破坏。前期坡体处于蠕滑阶段,坡体在位中前部位移速度最大,该位置率先破坏,其次为后缘部位,中前部与后缘因速度差挤压前方颗粒,随着时间推移,前缘部位颗粒开始剪出,后缘出现张拉裂缝,后续速度变化较为稳定,有整体下滑的趋势。In order to study the failure motion characteristics of a landslide in Yichuan County, Henan Province, under the action of rainfall, a 1:1 numerical calculation model was established by using the particle discrete element software and the Ball-Wall method and simulated. The velocity and displacement cloud patterns under different time steps were obtained, and the displacement and velocity changes during the movement of the slope were recorded at different positions of the slope. The research results show that the overall failure characteristics of the landslide are the middle shear-leading edge traction-trailing edge tensile cracking. The performance is a creep-tensile cracking failure. The slope is in the creep stage in the early stage, and the moving speed of the front part of the slope is the largest in the middle, which is the first to be destroyed, followed by the trailing edge. The front and rear parts of the slope are squeezed by the speed difference. As time goes by, the front edge particles begin to cut out, and tensile cracks appear on the trailing edge. The subsequent speed changes are relatively stable, and there is an overall downward trend.展开更多
基于行驶轨迹全球导航卫星系统(GNSS)数据,提出了出租车运动学片段提取规则和方法。根据主成分分析(PCA)及累积贡献率,确定了8个表征运动学片段的关键指标;结合K‒均值聚类算法,挖掘出租车运动特征模式。为了确保运动特征模式关键指标权...基于行驶轨迹全球导航卫星系统(GNSS)数据,提出了出租车运动学片段提取规则和方法。根据主成分分析(PCA)及累积贡献率,确定了8个表征运动学片段的关键指标;结合K‒均值聚类算法,挖掘出租车运动特征模式。为了确保运动特征模式关键指标权重的客观合理性,采用考虑指标关联性的CRITIC(criteria importance through intercriteria correlation)法和考虑指标离散程度的熵权法,构建了基于纳什均衡的组合赋权的多准则妥协解排序(VIKOR)评价模型,用于多时空情景下出租车运动特征模式评价和出租车行驶状态研判。结果表明,基于纳什均衡的组合赋权法可以有效融合CIRTIC法与熵权法对评价指标的优势,获得更合理的权重系数。就安全性、效率和舒适性而言,出租车行驶状态在主干路和次干路上优于在支路上。早高峰出租车行驶安全性最佳,平峰和晚高峰相对一般。展开更多
文摘为研究降雨作用下河南省伊川县某滑坡的破坏运动特征分析,利用颗粒离散元软件,采用Ball-Wall法建立1:1数值计算模型并进行模拟计算,得出不同时间步长下的速度与位移云图,并在坡体不同的位置记录坡体运动过程中位移及速度变化的情况。研究结果表明:该滑坡整体破坏特征为:中部剪切–前缘牵引–后缘拉裂。表现为蠕滑–拉裂式破坏。前期坡体处于蠕滑阶段,坡体在位中前部位移速度最大,该位置率先破坏,其次为后缘部位,中前部与后缘因速度差挤压前方颗粒,随着时间推移,前缘部位颗粒开始剪出,后缘出现张拉裂缝,后续速度变化较为稳定,有整体下滑的趋势。In order to study the failure motion characteristics of a landslide in Yichuan County, Henan Province, under the action of rainfall, a 1:1 numerical calculation model was established by using the particle discrete element software and the Ball-Wall method and simulated. The velocity and displacement cloud patterns under different time steps were obtained, and the displacement and velocity changes during the movement of the slope were recorded at different positions of the slope. The research results show that the overall failure characteristics of the landslide are the middle shear-leading edge traction-trailing edge tensile cracking. The performance is a creep-tensile cracking failure. The slope is in the creep stage in the early stage, and the moving speed of the front part of the slope is the largest in the middle, which is the first to be destroyed, followed by the trailing edge. The front and rear parts of the slope are squeezed by the speed difference. As time goes by, the front edge particles begin to cut out, and tensile cracks appear on the trailing edge. The subsequent speed changes are relatively stable, and there is an overall downward trend.
文摘基于行驶轨迹全球导航卫星系统(GNSS)数据,提出了出租车运动学片段提取规则和方法。根据主成分分析(PCA)及累积贡献率,确定了8个表征运动学片段的关键指标;结合K‒均值聚类算法,挖掘出租车运动特征模式。为了确保运动特征模式关键指标权重的客观合理性,采用考虑指标关联性的CRITIC(criteria importance through intercriteria correlation)法和考虑指标离散程度的熵权法,构建了基于纳什均衡的组合赋权的多准则妥协解排序(VIKOR)评价模型,用于多时空情景下出租车运动特征模式评价和出租车行驶状态研判。结果表明,基于纳什均衡的组合赋权法可以有效融合CIRTIC法与熵权法对评价指标的优势,获得更合理的权重系数。就安全性、效率和舒适性而言,出租车行驶状态在主干路和次干路上优于在支路上。早高峰出租车行驶安全性最佳,平峰和晚高峰相对一般。
