本文選題：單軸壓縮 + 塊石膠結充填體�。� 參考：《江西理工大學》2015年碩士論文

【摘要】：聲發(fā)射技術作為一種非接觸式、實時、動態(tài)的監(jiān)測手段已經在巖石、混凝土等材料中得到應用。但目前,運用聲發(fā)射技術對塊石膠結充填體穩(wěn)定性方面進行的研究尚屬罕見,而塊石膠結充填采礦法作為現(xiàn)在礦山開采中的一種新型采礦方法已在礦山中得到進一步的應用。因此,對塊石膠結充填體聲發(fā)射特征進行研究并探究其失穩(wěn)破壞的原因是十分有必要的。本文通過室內試驗,運用b值和分形理論對塊石膠結充填體失穩(wěn)破壞的聲發(fā)射特征進行處理、分析。主要研究結論如下:(1)聲發(fā)射b值和關聯(lián)分維值的上升代表著裂紋向著有序的方向發(fā)展,裂紋從小尺度擴展為大尺度,大尺度破壞占主導的地位;聲發(fā)射b值和關聯(lián)分維值的下降代表著裂紋發(fā)展呈現(xiàn)隨機的、均勻的、無序的狀態(tài),裂紋以小尺度破壞為主,但在整個單軸壓縮過程中變化復雜,沒有統(tǒng)一的規(guī)律性,在破壞前沒有明顯的征兆。(2)塊石膠結充填體的失穩(wěn)破壞是由于兩種介質變形不協(xié)調而發(fā)生剪切破壞,剪切面始終發(fā)生在膠結材料上而非塊石,而且其他條件均未變,隨著灰砂比的增加,塊石膠結充填體的聲發(fā)射現(xiàn)象越來越不明顯。以上皆說明塊石膠結充填體的聲發(fā)射信號主要是來自于內部的膠結材料的破壞。(3)內部塊石對裂紋的擴展起到了阻礙作用,導致塊石膠結充填體的聲發(fā)射b值和關聯(lián)分維值不會單調變化,其變化非常復雜,試件破壞后難以形成完整的剪切面,其破壞形式為復雜的剪切破壞,難以找到明顯的主裂紋。
[Abstract]:As a non-contact, real-time and dynamic monitoring method, acoustic emission technology has been applied in rock, concrete and other materials. But at present, it is rare to study the stability of cemented filling body with acoustic emission technology, and as a new mining method in mining, block cemented filling method has been further applied in mining. Therefore, it is necessary to study the acoustic emission characteristics of cemented rock filling and to explore the causes of instability and failure. In this paper, the acoustic emission characteristics of rock cemented filling are treated and analyzed by using b value and fractal theory through laboratory tests. The main conclusions are as follows: (1) the rise of AE b value and correlation fractal dimension value indicates that the crack develops towards the direction of order, the crack grows to a large scale at a small scale, and the large scale damage dominates. The decrease of acoustic emission b value and correlation fractal dimension value represents the random, uniform and disordered state of crack development. The crack is dominated by small scale failure, but the variation is complex in the whole uniaxial compression process, and there is no uniform regularity. There is no obvious sign before the failure. (2) the instability failure of the block cemented filling body is caused by shear failure due to the incongruity of the deformation of the two kinds of media, the shear plane always occurs on the cemented material and not on the block stone, and the other conditions have not changed. With the increase of the ratio of lime to sand, the acoustic emission of cemented filling body is less and less obvious. All these indicate that the acoustic emission signal of the cemented filling is mainly from the damage of the internal cementing material. As a result, the acoustic emission b value and the correlation fractal dimension of the cemented filling body do not change monotonously, but the change is very complex. It is difficult to form a complete shear surface after the failure of the specimen, and the failure form is complex shear failure, so it is difficult to find the obvious main crack.
【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD853.34

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