化工矿物与加工2026，Vol.55Issue(3)：58-68,11.DOI:10.16283/j.cnki.hgkwyjg.2026.03.008
循环加卸载条件下不同层理倾角磷块岩损伤特性研究
Research on the damage characteristics of phosphate rock with different bedding dip angles under cyclic loading and unloading
摘要
Abstract
In order to reveal the damage evolution law of sedimentary phosphorite under the coupling action of bedding dip angle and cyclic loading and unloading,standard specimens with 0°,30°,60° and 90° bedding dip angles were prepared,and uniaxial step-by-step cyclic loading and unloading tests were carried out.Combined with RFPA2D numerical simulation,the regulation mechanism of bedding dip angle on stress-strain characteristics,hysteretic evolu-tion,modulus response and damage variables of phosphorite was explored.The results show that the synergistic effect of bedding structure and cyclic load makes the axial strain hysteresis loop of phosphate rock present the evolution process of'loose-dense-loose again'.With the increase of the number of cycles,the loading elastic modulus increa-ses as a whole,the unloading elastic modulus decreases slowly,and the damage variable accumulates monotonously in the form of'decreasing growth rate'.The peak strength shows a typical'V'shape with the increase of bedding dip angle,and the strength of 60° inclination specimen is the lowest.The RFPA2D numerical simulation confirms the con-trol effect of bedding dip angle on the failure mode of phosphate rock from the mesoscopic level,and is consistent with the macroscopic test results.The research results can provide theoretical support for the stability evaluation,support optimization and rockburst prevention and control of layered surrounding rock in deep phosphate rock.关键词
磷块岩/层理倾角/循环加卸载/损伤特性/破坏模式Key words
phosphate rock/bedding dip angle/cyclic loading and unloading/damage characteristics/failure mode分类
矿业与冶金引用本文复制引用
刘通,胡李欢,吝曼卿,李树建,熊欢,尹白琳..循环加卸载条件下不同层理倾角磷块岩损伤特性研究[J].化工矿物与加工,2026,55(3):58-68,11.基金项目
国家自然科学基金项目(52174085). （52174085）
