四川轻化工大学学报（自然科学版）2023，Vol.36Issue(6)：73-80,8.DOI:10.11863/j.suse.2023.06.10
压-剪耦合冲击下冻土力学行为与能量演化研究
Study on Mechanical Behavior and Energy Evolution of Frozen Soil Under Compression-Shear Impact Loading
摘要
Abstract
Frozen soil is inevitably subjected to compression-shear dynamic loading in the construction of cold region engineering.To study the mechanical properties and energy evolution of frozen soil under compression-shear impact loading,four kinds of frozen soil samples with different tilt angles(0°,3°,5°,7°)are designed,and the impact experiments are carried out with split Hopkinson pressure bar at three different freezing temperatures(-23℃,-15℃,-7℃).The results show that the failure process of frozen soil under compression-shear impact loading can be divided into elastic stage,plastic stage and failure stage.The compressive strength of 0° samples decreased by 41.4% with the temperature increasing from-23℃ to-7℃,while the compressive strength at-23℃ decreased by 21.0% with the tilt angle increasing from 0° to 7°.The compressive strength of frozen soil shows obvious temperature-sensitive and certain load-path dependent.The failure surface of frozen soil continuously expands outward with the decrease of temperature.The damage process of frozen soil is accompanied by energy accumulation,dissipation and release,and the energy dissipation density decreases with the increase of tilt angle and temperature.关键词
冻土/冲击/压-剪耦合/能量演化/破坏面Key words
frozen soil/impact/compression-shear/energy evolution/failure surface分类
数理科学引用本文复制引用
王艳薇,朱志武..压-剪耦合冲击下冻土力学行为与能量演化研究[J].四川轻化工大学学报（自然科学版）,2023,36(6):73-80,8.基金项目
四川省自然科学基金项目(2022NSFSC0420) （2022NSFSC0420）
