充填体抗拉破坏时声发射特性与数值模拟研究 - 有色金属科学与工程.DOCVIP

拉伸试验中充填体声发射特性及数值模拟研究 谢勇a,c 何文b,c 刘贤俊a,c 谢涛a,c 黄翔涛a （江西理工大学，a.建筑与测绘工程学院， b.资源与环境工程学院，c.江西省矿业工程重点实验室， 江西 赣州 341000）( Study on numerical Simulation of damage evolution and acoustic emission characteristics for backfill the tensile test XIE Yonga,c HE Wenb,c LIU Xian-juna,c XIE Taoa,c HUANG Xiang-taoa (a. School of Architectural and Surveying Engineering, b. School of Resources and Environmental Engineering, c. Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000,China) Abstract: The roof?cemented backfill?damage is not only?affected by the?compressive strength , but also for the?tensile failure in the underhand stoping with cemented filling?process. In order to fully?explore cemented backfill roof?tensile failure?during the evolution of?damage law, Uniaxial?tensile member?damage was done?to monitor the whole process?of cementing backfill ?test by using acoustic emission?technique，And used RFPA2D software to simulated for cemented filling on tensile failure and acoustic emission signals . The simulation results show Consolidated cemented backfill?in?the tensile?specimen?is?central disc, the?loading?axis direction appeared crack?initiation, extension and?gathered into?macro?fracture zone and eventually lead to the overall?loss of?failure process.The simulation results also?represent the?distribution?of acoustic emission?during?tensile?failure and had a good consistency Contrasted the?results?of indoor?test?of acoustic emission?characteristics. That?can simulate the?damage evolution?more accurate?rules when the?tensile strength?of cemented backfill?damage by using the?numerical simulation?analysis software——RFPA2D. At the same time ,it provides a theoretical basis for?using acoustic emission technology as the?monitoring?of consolidated filling body?damage. Key word: tensile failure; acoustic emission technique; numerical simulation; the damage evolution law 引言 随着采矿技术的发展和矿山地下开采深度逐步增加，下向胶结充填法已成为于金属矿山常用的一种采矿方法，然而