【摘要】：為了探究不同顆粒大小組成形式的聲發(fā)射特性,更好的了解礦物顆粒大小組成與聲發(fā)射平靜期間的內(nèi)在關(guān)系;通過花崗巖的顆粒大小與聲發(fā)射特性試驗的初步研究,然后采用不同顆粒大小的石英砂模擬材料進行單軸聲發(fā)射試驗,了解不同顆粒組成形式的模擬材料力學(xué)性能、聲發(fā)射特性及探討了組成形式的不同對發(fā)射特性的影響;本次研究主要以室內(nèi)模擬試驗為手段,結(jié)合理論分析,對灰砂比1:4,濃度70%,養(yǎng)護期為28天的(0.1-0.2mm、0.63-1mm)及0.5:1(0.1-0.2mm:0.63-1mm)、1:1、1:0.5的高純石英砂模擬材料和淺灰色粗中粒黑云母花崗巖巖石材料,進行了單軸聲發(fā)射試驗,主要對以下幾個方面進行了研究和探討:(1)對不同顆粒大小組成的石英砂模擬材料和花崗巖巖石材料進行單軸壓縮試驗。(2)研究了顆粒組成形式不同對聲發(fā)射特性的影響。(3)從顆粒的角度用類巖石模擬材料試件來探索巖石材料中出現(xiàn)聲發(fā)射“相對平靜現(xiàn)象”的原因。得到以下結(jié)論:(1)不同顆粒大小及不同配比類巖石材料試件的變形特征與巖石材料的變形破壞特征比較類似,都可以大致的劃分為:初始壓密、彈性變形、塑性變形、裂紋加速擴展至試件破壞4個階段;顆粒的大小組成形式不同,試件的延展性有差別,粗顆粒的延性較細(xì)顆粒的明顯。(2)顆粒組成會影響試件的單軸抗壓強度;細(xì)顆粒的抗壓強度大于粗顆粒的,從0.5:1到1:1再到1:0.5隨(0.1-0.2mm)粒徑顆粒的比例增大,模擬材料試件單軸抗壓強度呈遞增趨勢。(3)用模擬材料驗證了巖石材料在組成成分及粒徑相同的情況下,巖石材料和類巖石材料都有存在有的有聲發(fā)射“相對平靜的現(xiàn)象”,有的就沒有聲發(fā)射“相對平靜現(xiàn)象”;即聲發(fā)射平靜期的出現(xiàn)與顆粒之間組成的形式的關(guān)系規(guī)律不明顯。(4)不同顆粒大小組成形式的模擬材料試件的峰值頻率分布范圍主要分布在[10-120]KHz,顆粒不同每個階段的峰值頻率分布不同,在中后期含0.63-1mm粒徑的試件存在較多低頻,頻帶逐漸變寬。(5)顆粒大小的組成形式不同影響聲發(fā)射的特性。在0.1-0.2mm、0.63-1mm及0.5:1(0.1-0.2mm:0.63-1mm)、1:1、1:0.5的石英砂聲發(fā)射試驗中,只有(1:0.5)石英砂試件中才存在相對明顯的聲發(fā)射“相對平靜的現(xiàn)象”。(6)從(50)N/(50)E值曲線可以看出不同顆粒組成形式的試件內(nèi)部裂紋演化情況不同,聲發(fā)射信號也有所不同,含粗顆粒試件的(50)N/(50)E值曲線大多是“階梯狀”;粗顆粒的內(nèi)部破壞在后期會產(chǎn)生大量低能試件。
[Abstract]:In order to explore the acoustic emission characteristics of different particle size components, we can better understand the relationship between mineral particle size composition and the quiet period of AE. Through the preliminary study on the particle size and acoustic emission characteristics of granite, the uniaxial acoustic emission tests of quartz sand with different particle sizes were carried out to understand the mechanical properties of the simulated materials with different particle composition. The acoustic emission characteristics and the influence of different composition forms on the emission characteristics are discussed. In this study, by means of indoor simulation test and theoretical analysis, the ratio of ash to sand was 1 ~ 4, the concentration was 70%, and the maintenance period was 28 days (0.1 ~ 0.2 mm, P < 0.01). 0.63-1mm) and 0.5 (0.1-0.2mm:0.63-1mm), 1 (1), 1 (0.5) high-purity quartz sand simulation materials and grayish coarse medium-sized biotite granite rock materials were tested by uniaxial acoustic emission (AE). The following aspects were studied and discussed: (1) uniaxial compression tests of quartz sand simulation materials and granite rock materials with different particle size composition were carried out. (2) different particle composition pairs were studied. The influence of acoustic emission characteristics. (3) from the point of view of particles, the causes of the "relatively calm" phenomenon of acoustic emission in rock materials are studied by means of rock-like simulation materials. The results are as follows: (1) the deformation characteristics of rock specimens with different particle sizes and different ratios are similar to those of rock materials, and they can be roughly divided into: initial compaction, elastic deformation and plastic deformation, and the deformation characteristics of rock specimens are similar to those of rock materials, such as initial compaction, elastic deformation, plastic deformation, and so on. The crack propagation is accelerated to four stages of specimen failure; The ductility of the specimens is different when the size of the particles is different, and the ductility of the coarse particles is obvious. (2) the composition of the particles will affect the uniaxial compressive strength of the specimens. When the compressive strength of fine particles is greater than that of coarse particles, the compressive strength of fine particles increases from 0.5 to 1:1 and then from 1 to 1 / 0. 5 with the increase of (0.1-0.2mm) particle size. The uniaxial compressive strength of the simulated material specimen increases gradually. (3) the simulation material is used to verify that the rock material has the same composition and particle size under the condition of the same composition and particle size. There are some acoustic emission "relatively calm" phenomena in rock-like and rock-like materials, and some have no "relative calm" phenomenon in acoustic emission. That is to say, the relationship between the appearance of the quiet period of AE and the form of particle composition is not obvious. (4) the peak frequency distribution range of simulated material specimens with different particle size is mainly distributed in [10 脳 120] KHz,. The peak frequency distribution of particles in different stages is different. There are more low frequencies in the samples with 0.63-1mm particle size in the middle and late stages, and the frequency band becomes wider gradually. (5) the characteristics of acoustic emission are influenced by the composition of the particles. In the test of acoustic emission of quartz sand with 0.1 ~ 0.2mm, 0.63 ~ 1mm and 0.5 ~ (1) (0.1-0.2mm:0.63-1mm), 1 ~ (1), 1 ~ (0.5), 1 ~ (- 1), 1 ~ (0.5) mm, Only (1) 0.5) quartz sand samples have relatively obvious acoustic emission "relatively calm phenomenon". (6) from the curve of (50) N / (50) E value, it can be seen that the internal cracks of the specimens with different particle composition forms can be seen. The evolution of the grain is different, The acoustic emission signals are also different. Most of the (50) N / (50) E curves with coarse particles are "stepped". The internal failure of coarse particles will produce a large number of low-energy specimens at the later stage.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD315

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