工程地质学报2024，Vol.32Issue(1)：74-85,12.DOI:10.13544/j.cnki.jeg.2022-0003
循环加卸载下黑云母石英片岩的弹性模量与能量演化特征研究
EVOLUTION CHARACTERISTICS OF ELASTIC MODULUS AND ENERGY OF BIOTITE QUARTZ SCHIST UNDER CYCLIC LOADING AND UNLOAD-ING TEST
摘要
Abstract
The biotite quartz schist is a typical anisotropic rock.To study its damage evolution law and anisotropic characteristics,equal plastic strain cyclic loading and unloading tests were carried out on samples with schistosity angles of 0°,45°,and 90°.The results show that the failure modes of specimens with different schistosity plane an-gles are distinct,with tension fracture phenomena observed in the 0°schistosity samples and shear fracture phenom-ena in the 45°schistosity samples being particularly pronounced.With an increase in plastic strain,the elastic mod-ulus of biotite quartz schist first strengthens and then weakens.This phenomenon is more evident under high confi-ning pressure.The turning point in the weakening stage is consistent with the corresponding plastic strain when the initiation strength is stable.As an evaluation index of rock damage and the deterioration process,the elastic modu-lus is less affected by the angles of schistosity than the integrity coefficient.In the process of the internal energy evo-lution of rock,the relationship between dissipated energy and the angles of schistosity is 0°＞90°＞45°.The relation-ship between the decreasing rate of dissipated energy and elastic energy is 45°＞90°＞0°.The corresponding plastic strain of the elastic energy and dissipated energy when it evolves to a stable state is the same as that of damaged strength.This study explores the mechanical behavior of damage evolution of biotite quartz schist through the analy-sis of the evolution characteristics of elastic modulus and energy.关键词
黑云母石英片岩/各向异性/循环加卸载/弹性模量/能量Key words
Biotite quartz schist/Anisotropy/Cyclic loading and unloading/Elastic modulus/Energy分类
建筑与水利引用本文复制引用
裴润生,包含,兰恒星,黄晓林,晏长根..循环加卸载下黑云母石英片岩的弹性模量与能量演化特征研究[J].工程地质学报,2024,32(1):74-85,12.基金项目
国家自然科学基金项目(资助号:42177142,42041006),国家重点研发计划项目(资助号:2019YFC1520601),西安市科协青年人才托举计划(资助号:095920201310),长安大学中央高校基本科研业务费专项资金(资助号:300102212213).This research is supported by the National Natural Science Foundation of China(Grant Nos.42177142,42041006),National Key R&D Program of China(Grant No.2019YFC1520601),Youth Talent Promotion Program of Xi'an Association for Science and Technology(Grant No.095920201310)and the Fundamental Research Funds for the Central Universities,CHD(Grant No.300102212213). （资助号:42177142,42041006）
