Rock slopes with large intersection angles between the strikes of strata and surface(RS-LISS)represent a unique type of layered rock slope.These slopes are usually considered to be well stabilized and less prone to la...Rock slopes with large intersection angles between the strikes of strata and surface(RS-LISS)represent a unique type of layered rock slope.These slopes are usually considered to be well stabilized and less prone to landslides.However,when such slopes contain a significant number of discontinuities,their stability is greatly weakened.This study provided innovative insights into the stability of RS-LISS and conducted an in-depth investigation of their step-path failure mechanisms.The Riyi landslide on the eastern margin of the Qinghai-Tibet Plateau,China,was taken as a typical case and detailed investigations of geological structure and deformation characteristics of the slope were conducted by means of slope mapping,core drilling,and exploratory adits.A large number of steep-dip and gentle-dip joints were discovered in the slope,along with several critical discontinuities such as faults.Analysis shows that the tectonic stresses and river downcutting over geological time played significant roles in the formation of these discontinuities.Based on the investigation results,a numerical model of DFN for the Riyi landslide was developed.The simulation results indicated that the slope could develop a sliding surface characterized by a steep back and a gentle base,formed through the stepped interconnection of various discontinuities.Additionally,the deformation of the rock mass mainly originated from the major fault,progressively extending downward.The sliding mass may slide suddenly as a whole along the stepped bottom surface,with the compressional fracture zones as lateral boundaries,presenting a"drawer-like"movement towards the free surface.展开更多
传统快速搜索随机树(rapidly-exploring random trees,RRT)路径规划算法具有随机性强、搜索效率低、迭代次数多、路径质量差等问题。通过结合势场法、引入动态步长策略、剔除冗余节点、路径平滑和修改避碰点等方法优化RRT算法路径规划...传统快速搜索随机树(rapidly-exploring random trees,RRT)路径规划算法具有随机性强、搜索效率低、迭代次数多、路径质量差等问题。通过结合势场法、引入动态步长策略、剔除冗余节点、路径平滑和修改避碰点等方法优化RRT算法路径规划过程中的步骤,并在RRT算法上加以改进。基于MATLAB平台,在2D、3D空间下进行多次仿真验证,对比传统RRT算法与改进后的RRT算法的规划时间、迭代次数等性能指标,结果表明,改进后的RRT算法路径规划效率、收敛速度、路径质量等方面有了明显提升。展开更多
基金supported by the National Natural Science Foundation of China(No.U23A2047,No.42277187,No.42307248)Natural Science Foundation of Hebei Province(No.D2022202005)。
文摘Rock slopes with large intersection angles between the strikes of strata and surface(RS-LISS)represent a unique type of layered rock slope.These slopes are usually considered to be well stabilized and less prone to landslides.However,when such slopes contain a significant number of discontinuities,their stability is greatly weakened.This study provided innovative insights into the stability of RS-LISS and conducted an in-depth investigation of their step-path failure mechanisms.The Riyi landslide on the eastern margin of the Qinghai-Tibet Plateau,China,was taken as a typical case and detailed investigations of geological structure and deformation characteristics of the slope were conducted by means of slope mapping,core drilling,and exploratory adits.A large number of steep-dip and gentle-dip joints were discovered in the slope,along with several critical discontinuities such as faults.Analysis shows that the tectonic stresses and river downcutting over geological time played significant roles in the formation of these discontinuities.Based on the investigation results,a numerical model of DFN for the Riyi landslide was developed.The simulation results indicated that the slope could develop a sliding surface characterized by a steep back and a gentle base,formed through the stepped interconnection of various discontinuities.Additionally,the deformation of the rock mass mainly originated from the major fault,progressively extending downward.The sliding mass may slide suddenly as a whole along the stepped bottom surface,with the compressional fracture zones as lateral boundaries,presenting a"drawer-like"movement towards the free surface.
文摘传统快速搜索随机树(rapidly-exploring random trees,RRT)路径规划算法具有随机性强、搜索效率低、迭代次数多、路径质量差等问题。通过结合势场法、引入动态步长策略、剔除冗余节点、路径平滑和修改避碰点等方法优化RRT算法路径规划过程中的步骤,并在RRT算法上加以改进。基于MATLAB平台,在2D、3D空间下进行多次仿真验证,对比传统RRT算法与改进后的RRT算法的规划时间、迭代次数等性能指标,结果表明,改进后的RRT算法路径规划效率、收敛速度、路径质量等方面有了明显提升。
