饱水花岗岩巷道岩爆声发射时序特性实验研究

发布时间：2019-01-22 14:24

【摘要】：为了探讨水对岩石岩爆性能的影响,采用双轴微机控制伺服压力系统及PCI-2声发射监测系统对干燥及饱水花岗岩进行了室内岩爆模拟声发射试验。研究结果表明:水对花岗岩的强度、变形特征有较大影响。饱水使花岗岩峰值强度下降了12.69%,变形模量下降了8.24%;水在一定程度上抑制了花岗岩内部原生裂纹的孕育进度,降低了岩爆过程中声发射的活跃程度。水平卸荷后,干燥花岗岩累积振铃计数近似直线增长,饱水花岗岩则呈"台阶"状上升;干燥花岗岩岩爆过程中b值历经孕育区、发展区、下降区;饱水花岗岩b值第三阶段则为群聚区,意味着水可以软化岩样,降低岩爆烈度;水改变了花岗岩岩爆过程中内部裂纹的破坏机制,饱水花岗岩水平卸荷后的Ra值呈束状分布,内部裂纹以拉—剪—拉共存的形式破坏,而干燥花岗岩则呈张拉破裂为主,剪切为辅的破坏形式。
[Abstract]:In order to investigate the effect of water on rock burst performance, laboratory rock burst simulation tests were carried out by using a biaxial microcomputer controlled servo pressure system and a PCI-2 acoustic emission monitoring system for dry and saturated granite. The results show that water has great influence on the strength and deformation characteristics of granite. Saturated water decreases the peak strength of granite by 12.69 and the modulus of deformation by 8.240.Water to some extent inhibits the development of primary cracks in granite and reduces the activity of acoustic emission during rock burst. After horizontal unloading, the cumulative ringing count of dry granite increases linearly, while the saturated granite rises in "step" shape, and the b value goes through the inoculation area, the development area and the descending area during the rock burst of dry granite. The third stage of b value of saturated granite is cluster area, which means that water can soften rock samples and reduce rock burst intensity. Water changes the failure mechanism of internal cracks during granite rock burst. The Ra value of saturated granite after horizontal unloading shows a bundle distribution, the internal crack is destroyed in the form of tension-shear-tension coexistence, while the dry granite is mainly tensional fracture. A form of failure supplemented by shear.
【作者单位】：华北理工大学以升创新教育基地;河北省矿业开发与安全技术重点实验室;华北理工大学矿业工程学院;
【基金】：国家自然科学基金项目(51374088,51174071) 国家级大学生创新创业训练计划项目(201410081031) 华北理工大学大学生创新性实验计划项目(X2014067)
【分类号】：TD315

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