【摘要】：目前,國(guó)內(nèi)外大量學(xué)者圍繞聲發(fā)射技術(shù)應(yīng)用于巖石損傷監(jiān)測(cè)進(jìn)行了廣泛研究,促進(jìn)了這一技術(shù)的發(fā)展和應(yīng)用,眾所周知,自然界中的巖石均含有一定量的水分,地下水是影響巖體流變及工程穩(wěn)定性的重要因素。水的存在,使聲發(fā)射信號(hào)變得更加復(fù)雜,針對(duì)這一問(wèn)題,本文在含水巖石破裂過(guò)程聲發(fā)射試驗(yàn)的基礎(chǔ)上,對(duì)不同含水量巖樣損傷破壞聲發(fā)射特征進(jìn)行了研究。首先,對(duì)不同含水量完整巖樣進(jìn)行單軸壓縮試驗(yàn),同時(shí)使用聲發(fā)射實(shí)驗(yàn)儀器對(duì)整個(gè)實(shí)驗(yàn)過(guò)程的聲發(fā)射數(shù)據(jù)進(jìn)行監(jiān)測(cè)和記錄。選取砂巖、花崗巖各15塊并用烘干設(shè)備烘干,分別選出3塊作為干燥巖樣,其余進(jìn)行泡水處理,制成干燥到飽和之間不同含水量的試樣并進(jìn)行試驗(yàn)。試驗(yàn)結(jié)果表明干燥完整巖樣聲發(fā)射事件數(shù)與其加載時(shí)間存在以下幾個(gè)階段：第一階段,試驗(yàn)初始階段聲發(fā)射事件數(shù)增長(zhǎng)緩慢,聲發(fā)射事件數(shù)變化并不明顯；第二階段,聲發(fā)射事件數(shù)變化率大于第一階段,并趨于穩(wěn)定；第三階段,試驗(yàn)即將結(jié)束前,聲發(fā)射事件數(shù)變化率變大,聲發(fā)射事件數(shù)瞬間達(dá)到頂峰直至實(shí)驗(yàn)結(jié)束。由于加載速率分別為砂巖20kN/min、花崗巖30kN/min的自動(dòng)控制系統(tǒng),因此,聲發(fā)射事件數(shù)與應(yīng)力的關(guān)系也遵循這三個(gè)階段。對(duì)于其它含水量巖石,其強(qiáng)度會(huì)隨含水量的增加而減小,聲發(fā)射事件數(shù)也隨含水量的增加而減小,砂巖巖樣的強(qiáng)度明顯小于花崗巖,其聲發(fā)射事件數(shù)也少于花崗巖,但其含水量要大于花崗巖,含水量對(duì)花崗巖聲發(fā)射特征的影響也要小于其對(duì)砂巖的影響。砂巖的破壞形態(tài)會(huì)隨著含水量的增加而破壞的更完全,但總體破壞形態(tài)不變；花崗巖的破壞形態(tài)與含水量多少關(guān)系不大。其次,進(jìn)行了帶預(yù)制裂紋不同含水量砂巖、花崗巖單軸壓縮聲發(fā)射特征實(shí)驗(yàn)研究。實(shí)驗(yàn)結(jié)果顯示,帶預(yù)制裂紋巖石聲發(fā)射特征與完整巖樣聲發(fā)射特征比較相似,但帶預(yù)制裂紋的巖樣聲發(fā)射事件數(shù)的增長(zhǎng)率第一與第二階段的拐點(diǎn)比較靠后,由于其強(qiáng)度也弱于完整巖樣,因此,其聲發(fā)射事件數(shù)也少于完整巖樣。帶預(yù)制裂紋的砂巖破壞形態(tài)是由試樣上下兩端至預(yù)制裂紋根部各有一道裂紋,其含水量越大,破壞越完全,部分區(qū)域會(huì)有粉碎性破壞�；◢弾r的破壞形態(tài)與砂巖相似,但其裂紋相對(duì)較少,幾乎沒(méi)有粉碎性破壞。
[Abstract]:At present, a large number of scholars at home and abroad have carried out extensive research on the application of acoustic emission technology to rock damage monitoring, which has promoted the development and application of this technology. As we all know, rocks in nature contain a certain amount of water. Groundwater is an important factor affecting the rheology and engineering stability of rock mass. The acoustic emission signal becomes more complicated because of the existence of water. In this paper, the characteristics of damage and failure of rock samples with different water content are studied on the basis of acoustic emission test in the process of fracture of water-bearing rock. First, uniaxial compression tests were carried out on intact rock samples with different water content. At the same time, acoustic emission data of the whole experiment process were monitored and recorded by acoustic emission experiment instrument. 15 pieces of sandstone and granite were selected and dried by drying equipment. Three samples were selected as dry rock samples, and the others were treated with bubble water. The samples with different moisture content between drying and saturation were made and tested. The experimental results show that there are several stages between the number of acoustic emission events and the loading time of dry intact rock samples. In the first stage, the number of acoustic emission events increases slowly in the initial stage of the experiment, but the change of the number of acoustic emission events is not obvious. In the second stage, the change rate of the number of acoustic emission events is larger than that of the first stage and tends to be stable, and in the third stage, the change rate of the number of acoustic emission events becomes larger before the end of the experiment, and the number of acoustic emission events reaches its peak instantly until the end of the experiment. Because the loading rate is 20kN / min for sandstone and the automatic control system for granite 30kN/min, the relationship between the number of acoustic emission events and stress also follows these three stages. For other rocks with water content, the strength will decrease with the increase of water content, and the number of acoustic emission events will also decrease with the increase of water content. The strength of sandstone samples is obviously smaller than that of granite, and the number of acoustic emission events of sandstone samples is also less than that of granite. However, the water content of the granite is larger than that of granite, and the influence of water content on the acoustic emission characteristics of granite is smaller than that of sandstone. The failure form of sandstone will be more complete with the increase of water content, but the overall failure pattern will not change, and the failure form of granite has little relation with the amount of water content. Secondly, the acoustic emission characteristics of sandstone with prefabricated cracks and granite under uniaxial compression are studied. The experimental results show that the acoustic emission characteristics of rock with prefabricated cracks are similar to those of intact rock samples, but the growth rate of acoustic emission events of rock samples with prefabricated cracks is lower than that of the second stage. As its strength is weaker than that of intact rock samples, the number of acoustic emission events is also less than that of intact rock samples. The failure pattern of sandstone with prefabricated cracks is that there is a crack from the upper and lower ends of the specimen to the root of the prefabricated crack. The larger the water content, the more complete the failure will be, and there will be comminuted failure in some areas. The failure pattern of granite is similar to that of sandstone, but its crack is relatively few, and there is almost no comminuted failure.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU45

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李博;孫強(qiáng);王思源;藺宗宗;;單軸加載下砂巖聲發(fā)射特征的試驗(yàn)分析[J];地震工程學(xué)報(bào);2013年01期

2 陳景濤;;巖石變形特征和聲發(fā)射特征的三軸試驗(yàn)研究[J];武漢理工大學(xué)學(xué)報(bào);2008年02期

3 劉小蓮;費(fèi)文平;李倩;吳宇雷;;花崗巖卸荷破壞全過(guò)程聲發(fā)射特征試驗(yàn)[J];武漢大學(xué)學(xué)報(bào)(工學(xué)版);2013年04期

4 李俊平;余志雄;周創(chuàng)兵;戴躍華;孟剛;陳從新;劉才華;;水力耦合下巖石的聲發(fā)射特征試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2006年03期

5 劉孝敏,Ｋ．Ｍ．Ｈｏｌｆｏｒｄ,Ｄ．Ｃ．Ｃａｔｅｒ;鋼板桁架疲勞裂紋生長(zhǎng)模型和聲發(fā)射特征的研究[J];中國(guó)科學(xué)技術(shù)大學(xué)學(xué)報(bào);1998年03期

6 紀(jì)洪廣;張?jiān)抡?金延;孔靈銳;;二長(zhǎng)花崗巖三軸壓縮下聲發(fā)射特征圍壓效應(yīng)的試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2012年06期

7 翟松韜;吳剛;張淵;羅春泳;李玉壽;;高溫作用下花崗巖的聲發(fā)射特征研究[J];巖石力學(xué)與工程學(xué)報(bào);2013年01期

8 陳順云,許昭永,楊潤(rùn)海,趙晉明;含V形構(gòu)造花崗巖塊體破壞過(guò)程中的聲發(fā)射特征[J];地震地質(zhì);2003年02期

9 袁子清;唐禮忠;;巖爆傾向巖石的聲發(fā)射特征試驗(yàn)研究[J];地下空間與工程學(xué)報(bào);2008年01期

10 任松;白月明;姜德義;楊春和;陳結(jié);;周期荷載作用下鹽巖聲發(fā)射特征試驗(yàn)研究[J];巖土力學(xué);2012年06期

相關(guān)會(huì)議論文 前4條

1 朱維申;郭彥雙;李術(shù)才;林春金;溫暖冬;楊磊;;含邊裂紋試樣彎曲斷裂聲發(fā)射特征研究[A];第六屆中國(guó)功能材料及其應(yīng)用學(xué)術(shù)會(huì)議論文集（10）[C];2007年

2 費(fèi)鴻祿;徐小荷;唐春安;;巖爆模擬材料失穩(wěn)時(shí)聲發(fā)射特征[A];中國(guó)巖石力學(xué)與工程學(xué)會(huì)第三次大會(huì)論文集[C];1994年

3 周忠良;屠曉利;;大理巖單軸受壓破壞過(guò)程的聲發(fā)射特征研究[A];隧道、地下工程及巖石破碎學(xué)術(shù)研討會(huì)論文集[C];2007年

4 蔡江東;陳亞?wèn)|;孫全平;;基于信號(hào)解構(gòu)的巖石受壓過(guò)程聲發(fā)射特征研究[A];第十二次全國(guó)巖石力學(xué)與工程學(xué)術(shù)大會(huì)會(huì)議論文摘要集[C];2012年

相關(guān)碩士學(xué)位論文 前1條

1 張津之;含水巖石損傷破壞聲發(fā)射特征試驗(yàn)研究[D];東北大學(xué);2013年

，

本文編號(hào)：2459453