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displacement loading is more likely to induce fracture network. Meanwhile, the amplitude of acoustic emission (AE) waveform of limestone during fracturing is between 0.01 and 0.02 mV, and the main frequency...°. The results can be used as a reference for further study on the mechanism of limestone hydraulic fracturing. Key words: true triaxial; hydraulic fracturing; acoustic emission; particle flow code (PFC......
the step and continuous unloading of the equivalent model, the failure process and acoustic admission effect were studied, and the change curves and deterioration laws of unloading rock mass mechanics...; acoustic emission 岩体开挖工程一般伴随着原岩应力的扰动,调整和释放,并产生次生应力场,其实质就是一个卸荷的力学过程[1].在加载时,岩体中的结构面处于受压状态,仍具有较好的力学性能,但在卸荷条件下,岩体从受压状态转变为受拉状态,这些结构面的力学性能会迅速下降,使岩体力学性能降低,导致卸荷条件下岩体的力学特征与常规加载条件下的研究成果不相 符[2-5].为此,一些研究者对卸荷岩石力学进行......
Trans. Nonferrous Met. Soc. China 22(2012) 2792-2798 Experimental studies on pillar failure characteristics based on acoustic emission location technique XU Shuai, LIU Jian-po, XU Shi-da, WEI Jiong... Abstract: Acoustic emission (AE) technique is a useful tool for investigating rock damage mechanism, and is used to study the temporal-spatial evolution process of microcracks during the similar......
conducted on the rock joints under constant normal load (CNL), while the acoustic emission (AE) signals generated during shear tests were monitored with PAC Micro-II system. Before and after shearing... and macroscopic strength, which have the same change rule with shearing.Key words:rock joint; shear behavior; surface morphology; acoustic emission; joint roughness coefficient (JRC); joint matching......
; 文章编号:1672-7207(2015)09-3377-08 Acoustic emission in-situ stress testing of different lithology rock and its application PENG Rui, MENG Xiangrui, ZHAO Guangming, DONG Chunliang, ZUO... in the following) were taken as the core site according to the histogram. Rock lithologies were medium coarse sandstone and sandy mudstone, respectively. Acoustic emission testing instrument was used......
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reviewing of the all monitoring methods. The main research results are as follows. Based on the acoustic wave test, the EDZ of the surrounding rock can be determined by analyzing the velocity-depth curve... and quantitatively. Key words: excavation damaged zone (EDZ); elastic wave velocity; multipoint displacement meter; borehole television (BTV); acoustic emission (AE) 地下洞室的规模,埋深越来越大,结构形式以及它所处的地质条件越来越复杂,向着"长,大,深"方向发......
properties; electromechanical properties; acoustic impedance; [全文内容正在添加中] ......
and acoustic characteristics of the care compositions were made on the basis of epoxy resin.Dependencies of shear modulus,viscosity,the sound speed,and the damping coefficient as functions of polymerization were presented.Dynamics of spectral characteristics of acoustic signals in the polymerization were investigated.Comparison of the experimental results obtained reveals that the dynamics of the variation......