Spatial continuity and stress transfer:Primary and complementary factors shaping pure-swarm laboratory catalog into mixed burst-like and swarm-like  

作　　者：Qiquan Xiong Qing Lin Yue Gao Jesse C.Hampton 

机构地区：[1]Geomechanics and Damage Group(GeoD),Department of Civil and Environmental Engineering,University of Wisconsin-Madison,USA [2]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing,102249,China [3]College of Petroleum Engineering,China University of Petroleum,Beijing,102249,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第1期55-70,共16页岩石力学与岩土工程学报(英文)

摘　　要：Natural earthquakes and micro-seismicity resulting from hydraulic fracturing or other engineering practices display distinctively different spatial-temporal features,like mixed burst-and swarm-like features or predominantly swarm-like features.The mechanism(s)contributing to such observations can be diverse.We present the inspections on the dynamic formation process of the single swarm-like tree in laboratory acoustic emission(AE)catalogs.Such largest swarm-like trees can contain>97%AE events from the entire catalog within a test;and all catalogs under investigation display scale-invariance features.The formation of the largest swarm-like tree correlates with the rock fracture process analogue of the source pervasive process,where its AE releases exhibit significant spatial well-organization.Comparison to other laboratory catalogs under different laboratory settings helps us identify the spatial continuity of the rock fracture process as the primary factor in forming the largest swarm-like trees at laboratory scale.The stress transfer process is involved in the rock fracture process for the tests having pre-existing spatial discontinuity.Artificial perturbations on the spatial information induced by the stress transfer process further confirm that stress transfer also serves to shift the pure swarm-like catalog into a mixed burst-and swarm-like catalog.These laboratory observations may provide inspirational insights for understanding the field-scale mechanism(s)shaping the spatial-temporal energy release features.

关 键 词：Rock fracture Laboratory catalogs Swarm-like events Acoustic emission(AE) SCALE-INVARIANCE 

分 类 号：TU45[建筑科学—岩土工程]