工程地质学报2026，Vol.34Issue(3)：975-987,13.DOI:10.13544/j.cnki.jeg.2023-0493
普朗铜矿区冰碛物重塑样工程力学性能试验研究
EXPERIMENTAL STUDY ON ENGINEERING MECHANICAL PROPERTIES OF MORAINE RESHAPED SAMPLE IN PULANG COPPER MINE AREA
摘要
Abstract
To support debris-flow disaster prevention and surface moraine modification by grouting consolidation in the Pulang Copper Mine,this study investigated the engineering mechanical properties of surface moraine.Shear strength,cohesion(c),and internal friction angle(φ)of moraines with different grain-size compositions were examined using a combination of small direct-shear apparatus and large-scale direct-shear equipment for coarse-grained soils.Soil skeleton theory and the Mohr-Coulomb criterion were applied to analyze the strength mechanism.The results show that as particle size increases,cohesion c first decreases and then rises,while the internal friction angle φ increases exponentially.The moraine samples exhibit elastic-plastic-creep behavior.Moreover,an increase in particle size and vertical pressure shifts the shear stress-strain curve from slight hardening to stress softening.As particle size increases,the load-bearing structure of the sample transitions from a fine-particle-dominated mosaic structure to a coarse-particle-controlled skeleton structure.Coarse particles progressively govern the shear strength of the sample,shifting the dominant resistance from cohesion-based to friction-based.关键词
冰碛物/直剪/土骨架/颗粒级配/Mohr-Coulomb准则Key words
Moraine/Straight shear/Soil skeleton/Particle grading/Mohr-Coulomb criterion分类
建筑与水利引用本文复制引用
刘增,孙伟,杜俊,冯兴隆,王少勇,熊治茗,宋浩..普朗铜矿区冰碛物重塑样工程力学性能试验研究[J].工程地质学报,2026,34(3):975-987,13.基金项目
国家自然科学基金项目(资助号:42467022),云南省重大科技项目关键金属矿产资源集中区深部绿色勘查与安全开采(资助号:202202AG050014),云南省基础研究计划项目(资助号:202101BE070001-038,202201AT070146).This research is supported by the National Natural Science Foundation of China(Grant No.42467022),Deep Green Exploration and Safe Mining of Key Metal Mineral Resources Concentration Area of Major Science and Technology Projects in Yunnan Province(Grant No.202202AG050014)and Basic Research Project of Yunnan Province(Grant Nos.202101BE070001-038,202201AT070146). （资助号:42467022）
