大理岩破坏起裂应力及断裂能特征试验研究.pdfVIP

学兔兔 第36卷第4期 土木 建 筑 与环 境 工 程 Journal of Civil，Architectural Environmental Engineering Vo【．36 No．4 2014年8月 Aug．2O14 doi：10．11835／j．issn．1674—4764．2014．04．011 大理岩破坏起裂应力及断裂能特征试验研究 张黎明 ，高 速 ，任明远 ，王在 泉ra， (青岛理工大学a．理学院；b．蓝色经济区工程建设与安全山东省协同创新中心，山东青岛266033) 摘 要：根据大理岩常规三轴试验数据，探讨不同围压下大理岩破坏的起裂应力和起裂断裂能变化 规律。大理岩起裂应力位于峰值应力的53 ～76 之间，随围压升高向峰值强度逐渐逼近。起裂 断裂能与围压、峰值强度呈正线性关系。起裂应力对应的声发射能量计数率出现突跳，起裂点之后 声发射能量计数率和累计释放能量增加速度明显变快，理论计算求得的起裂点和声发射监测数据 吻合较好。大理岩常规三轴破坏符合Mogi—Coulomb强度准则。 关键词：三轴破坏；起裂应力；断裂能；声发射 中图分类号：TU45 文献标志码：A 文章编号：1674—4764(2014)04—0069—05 Experimental Analysis on Crack Initiation Stress and Rupture Energy of Marble Failure Zhang Liming。，。，Gao Su。，Ren Mingyuan。，Wang Zaiquan。，。 (a．College of Science：b．Co—operative Innovation Center of Engineering Construction and Safety in Shandong Peninsula Blue Economic Zone，Qingdao Technological University，Qingdao 266033，Shandong，P．R．China) Abstract：Based on the marble conventional triaxial test data，the crack initiation stress and rupture energy under different confining pressures are analyzed．Results showed that the crack initiation position is gradually close to the peak strength point with the increase of the confining pressure．The location of the crack initiation Occurs in 50 ～ 70 peak strength．The rupture energy and confining pressure are in positive linear relationship as well as the rupture energy and peak axial stress．And sudden increase of AE energy count corresponds with the crack initiation stress．AE energy count and cumulative energy increase quickly after the crack initiation position，which