In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2 D was used to simulate the triaxial test to study the influence of th...In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2 D was used to simulate the triaxial test to study the influence of the particle micro parameters on the macroscopic characteristics of cohesive soil and calibrate the micro parameters of DEM model on this basis. Embankment slope stability analysis was carried out by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under the gravity increase method is more obvious. Throughout the progressive failure process, the failure trends, maximum displacements, and velocity changes obtained by the two methods were consistent. When slope was destroyed, the upper part was cracked, the middle part was sheared, and the lower part was destroyed by extrusion. The conclusions of this paper can be applied to the safety factor calculation of cohesive soil slopes and the analysis of the instability process.展开更多
为了改善传统模基参数估计(model-based parameter estimation,MBPE)计算量大、参数难选择以及复杂环境电磁场重构困难的问题,提出将滑动窗口法与模基参数估计法相结合(model-based parameter estimation with the sliding window,SW-MB...为了改善传统模基参数估计(model-based parameter estimation,MBPE)计算量大、参数难选择以及复杂环境电磁场重构困难的问题,提出将滑动窗口法与模基参数估计法相结合(model-based parameter estimation with the sliding window,SW-MBPE)算法,通过少量采样数据即可重构二维空间的电磁场分布。将研究区域划分为不同的滑动窗,再通过模基参数估计(model-based parameter estimation,MBPE)算法在各个窗口内重构电磁场,既可大幅度减小计算量,又能灵活适应剧烈变化的电磁场;通过对相邻窗口重复计算区域的平均化处理,使滑动窗边缘得以平滑,以减轻分块效应。分析SW-MBPE算法的主要参数,得出1组适用于空间电磁场重构的模型参数。仿真结果表明,在均匀采样11%的情况下,SW-MBPE算法重构的FSIM值可达到0.8,可取得较好的重构效果。展开更多
基金Project(51808116) supported by the National Natural Science Foundation of ChinaProject(BK20180404) supported by the Natural Science Foundation of Jiangsu Province, China+1 种基金Project(KFJ170106) supported by the Changsha University of Science & Technology via Open Fund of National Engineering Laboratory of Highway Maintenance Technology,ChinaProject(242020R40133) supported by Fundamental Research Funds for the Central Universities, China。
文摘In order to study the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2 D was used to simulate the triaxial test to study the influence of the particle micro parameters on the macroscopic characteristics of cohesive soil and calibrate the micro parameters of DEM model on this basis. Embankment slope stability analysis was carried out by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under the gravity increase method is more obvious. Throughout the progressive failure process, the failure trends, maximum displacements, and velocity changes obtained by the two methods were consistent. When slope was destroyed, the upper part was cracked, the middle part was sheared, and the lower part was destroyed by extrusion. The conclusions of this paper can be applied to the safety factor calculation of cohesive soil slopes and the analysis of the instability process.
