發(fā)布時(shí)間：2018-07-22 13:36

【摘要】：砂漿是建筑中最常用的一種材料,其性能的優(yōu)劣直接影響著構(gòu)筑物的安全。從構(gòu)筑物的材料入手,研究砂漿材料變形破壞過程中的力學(xué)性能,利用聲發(fā)射監(jiān)測(cè)技術(shù)這一先進(jìn)的技術(shù)手段監(jiān)測(cè)砂漿材料破壞過程中聲發(fā)射信號(hào),探究其損傷機(jī)制,進(jìn)而預(yù)防或減少砂漿材料對(duì)構(gòu)筑物的危害有重要的理論意義和實(shí)用價(jià)值。本文以聲發(fā)射監(jiān)測(cè)機(jī)理、損傷理論為理論基礎(chǔ),采用理論分析與室內(nèi)試驗(yàn)相結(jié)合的方法,對(duì)砂漿試樣變形破壞過程中聲發(fā)射特性進(jìn)行了系統(tǒng)的研究,主要研究成果如下:(1)預(yù)制不同配比的砂漿試樣,開展單軸壓縮試驗(yàn),同時(shí)采用聲發(fā)射監(jiān)測(cè)系統(tǒng)進(jìn)行監(jiān)測(cè),研究了砂漿配比、加載速率與砂漿試樣強(qiáng)度之間的關(guān)系,研究表明砂漿試樣峰值強(qiáng)度隨加載速率增大而增大,砂漿試樣峰值強(qiáng)度隨水泥與砂質(zhì)量比的增大而增大;將砂漿試樣變形破壞全過程聲發(fā)射分成三個(gè)階段,初始?jí)好軓椥噪A段、屈服上升階段和破壞殘余階段;結(jié)合聲發(fā)射試驗(yàn)數(shù)據(jù),提出了一種預(yù)測(cè)指標(biāo)K,K值變化情況出現(xiàn)明顯的“回彈”現(xiàn)象,預(yù)示著砂漿試樣即將破壞。(2)預(yù)制鑄鐵、松木兩種夾芯材料的夾芯砂漿試樣,采用聲發(fā)射監(jiān)測(cè)技術(shù)監(jiān)測(cè)其單軸壓縮過程中聲發(fā)射信號(hào),得到了配比與夾芯砂漿試樣的強(qiáng)度關(guān)系,夾芯砂漿試樣峰值強(qiáng)度均隨水泥與砂質(zhì)量比的增大而增大,同一配比下的鑄鐵夾芯砂漿試樣的峰值強(qiáng)度大于松木砂漿試樣的峰值強(qiáng)度;夾芯砂漿試樣的聲發(fā)射事件計(jì)數(shù)特征與聲發(fā)射能量特征變化趨勢(shì)相同;K值變化情況出現(xiàn)明顯的“回彈”現(xiàn)象,也能預(yù)測(cè)夾芯砂漿試樣破壞。(3)根據(jù)聲發(fā)射能量值重新定義損傷變量,利用二參數(shù)威布爾分布理論給出砂漿試樣損傷演化方程,確定了各參數(shù),并對(duì)損傷演化方程進(jìn)行修正,最終建立了砂漿試樣本構(gòu)模型,理論結(jié)果與試驗(yàn)結(jié)果吻合。
[Abstract]:Mortar is one of the most commonly used materials in buildings, and its performance directly affects the safety of structures. Starting with the materials of the structure, the mechanical properties of mortar materials during deformation and failure are studied. The acoustic emission monitoring technology is used to monitor the acoustic emission signals during the destruction of mortar materials, and the damage mechanism is explored. Therefore, it has important theoretical significance and practical value to prevent or reduce the harm of mortar material to the structure. Based on the theory of acoustic emission monitoring and damage theory, the acoustic emission characteristics of mortar samples during deformation and failure are studied systematically by means of theoretical analysis and laboratory test. The main results are as follows: (1) the uniaxial compression test was carried out for prefabricated mortar samples with different ratios, and the relationship between mortar ratio, loading rate and strength of mortar samples was studied by acoustic emission monitoring system. The results show that the peak strength of mortar specimen increases with the increase of loading rate, the peak strength of mortar specimen increases with the increase of cement to sand mass ratio, and the acoustic emission of the whole process of deformation and failure of mortar specimen is divided into three stages, the initial compaction elastic stage. In combination with the acoustic emission test data, an obvious "springback" phenomenon is proposed to predict the change of K value, which indicates that the mortar sample is about to be destroyed. (2) prefabricated cast iron, Acoustic emission monitoring technique was used to monitor the acoustic emission signals of the core mortar samples of two kinds of pine core materials during uniaxial compression, and the relationship between the ratio and the strength of the sandwich mortar samples was obtained. The peak strength of core mortar increased with the increase of cement to sand mass ratio, and the peak strength of cast iron sandwich mortar sample with the same ratio was higher than that of pine mortar sample. The change trend of acoustic emission event counting and acoustic emission energy is the same as that of core mortar. The phenomenon of "springback" appears in the change of K value. It can also predict the failure of sandwich mortar samples. (3) according to the energy value of acoustic emission, the damage evolution equation of mortar specimen is given by using the two-parameter Weibull distribution theory, and the damage evolution equation is modified. Finally, the constitutive model of mortar specimen is established, and the theoretical results are in agreement with the experimental results.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ177.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 徐楊夢(mèng)迪;劉建鋒;徐慧寧;李天一;向高;鄧朝福;吳池;;單軸壓縮下含雜質(zhì)鹽巖的聲發(fā)射特征試驗(yàn)研究[J];四川大學(xué)學(xué)報(bào)(工程科學(xué)版);2016年06期

2 溫韜;唐輝明;劉佑榮;鄒宗興;王康;林成遠(yuǎn);;影響因子修正的新型巖石損傷統(tǒng)計(jì)本構(gòu)模型[J];中國礦業(yè)大學(xué)學(xué)報(bào);2016年01期

3 張黎明;任明遠(yuǎn);馬紹瓊;王在泉;王金良;;大理巖卸圍壓破壞全過程的聲發(fā)射及分形特征[J];巖石力學(xué)與工程學(xué)報(bào);2015年S1期

4 李心睿;徐清;謝紅強(qiáng);肖明礫;何江達(dá);;靜動(dòng)載耦合作用下裂隙巖石損傷本構(gòu)及演化特征[J];巖石力學(xué)與工程學(xué)報(bào);2015年S1期

5 丁靖洋;周宏偉;陳瓊;劉迪;劉建鋒;;鹽巖流變損傷特性及本構(gòu)模型研究[J];巖土力學(xué);2015年03期

6 劉泉聲;黃詩冰;康永水;黃興;;巖體凍融疲勞損傷模型與評(píng)價(jià)指標(biāo)研究[J];巖石力學(xué)與工程學(xué)報(bào);2015年06期

7 紀(jì)洪廣;盧翔;;常規(guī)三軸壓縮下花崗巖聲發(fā)射特征及其主破裂前兆信息研究[J];巖石力學(xué)與工程學(xué)報(bào);2015年04期

8 王云飛;黃正均;崔芳;;煤巖破壞過程的細(xì)觀力學(xué)損傷演化機(jī)制[J];煤炭學(xué)報(bào);2014年12期

9 李浩然;楊春和;劉玉剛;陳鋒;馬洪嶺;;單軸荷載作用下鹽巖聲波與聲發(fā)射特征試驗(yàn)研究[J];巖石力學(xué)與工程學(xué)報(bào);2014年10期

10 金解放;李夕兵;邱燦;陶偉;周學(xué)進(jìn);;巖石循環(huán)沖擊損傷演化模型及靜載荷對(duì)損傷累積的影響[J];巖石力學(xué)與工程學(xué)報(bào);2014年08期

相關(guān)博士學(xué)位論文 前2條

1 汪亦顯;含水及初始損傷巖體損傷斷裂機(jī)理與實(shí)驗(yàn)研究[D];中南大學(xué);2012年

2 李朝紅;基于損傷斷裂理論的混凝土破壞行為研究[D];西南交通大學(xué);2012年

，

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