不同应力路径下辉绿岩能量演化与破坏机制研究  

Energy evolution and failure mechanism of diabase under different stress paths

作　　者：苗胜军[1] 段懿轩 尹紫微 刘泽京 MIAO Shengjun;DUAN Yixuan;YIN Ziwei;LIU Zejing(School of Civil and Resource Engineering,University of Science&Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083

出　　处：《振动与冲击》2023年第14期154-161,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51974014,51574014);国家重点研发计划(2018YFC0604601)。

摘　　要：以灵宝矿区辉绿岩为研究对象,开展了单轴及三轴循环加卸载试验和恒轴压卸围压试验,分析了应力-应变曲线及破坏形态,研究了辉绿岩在不同应力路径下的能量演化过程与破坏机制。研究表明:在三轴循环加卸载变形破坏过程中,随着循环次数的增加,滞回环的面积逐渐增大,岩样耗散能与弹性能均增大,耗散能的增长速率逐渐变大,弹性能的增长速率逐渐变小,且围压越大耗能比越大,岩样内部的裂隙扩展和汇合现象显著增加;在恒轴压卸围压变形破坏过程中,围压对辉绿岩的抗压强度和横向变形影响较大;在相同初始围压下,相比较循环加卸载应力路径,卸围压应力路径下试件破坏时弹性能密度更大。The single&tri axial cyclic loading-unloading pressure test and the constant axial unloading confining pressure test were carried out on the diabase in Lingbao mining area.The stress-strain curves and damage patterns were analyzed,and the energy evolution process and damage mechanism of diabase under different stress paths were studied.The study shows that in the process of deformation and damage by triaxial cyclic loading-unloading,the area of the hysteresis loop gradually increases with the increase of the number of cycles,and both of the dissipation energy and elastic energy of the rock sample increase,however,the growth rate of dissipation energy gradually becomes larger,while the growth rate of elastic energy gradually becomes smaller,the larger the enclosing pressure is,the larger the energy dissipation ratio is,and the fracture expansion and confluence phenomenon inside the rock sample increase significantly.In the process of deformation and damage by constant axial unloading confining pressure,the influence of the confining pressure on the compressive strength and lateral deformation of diabase is rather significant.Under the same initial confining pressure,the elastic energy density of specimen destruction under the unloading stress path is greater than that under the cyclic loading-unloading stress path.

关 键 词：循环加卸载试验 卸围压试验 破坏机制 围压效应 

分 类 号：TU45[建筑科学—岩土工程]