砂漿試樣破壞過程聲發(fā)射試驗研究
發(fā)布時間：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性能,利用聲發(fā)射監(jiān)測技術這一先進的技術手段監(jiān)測砂漿材料破壞過程中聲發(fā)射信號,探究其損傷機制,進而預防或減少砂漿材料對構(gòu)筑物的危害有重要的理論意義和實用價值。本文以聲發(fā)射監(jiān)測機理、損傷理論為理論基礎,采用理論分析與室內(nèi)試驗相結(jié)合的方法,對砂漿試樣變形破壞過程中聲發(fā)射特性進行了系統(tǒng)的研究,主要研究成果如下:(1)預制不同配比的砂漿試樣,開展單軸壓縮試驗,同時采用聲發(fā)射監(jiān)測系統(tǒng)進行監(jiān)測,研究了砂漿配比、加載速率與砂漿試樣強度之間的關系,研究表明砂漿試樣峰值強度隨加載速率增大而增大,砂漿試樣峰值強度隨水泥與砂質(zhì)量比的增大而增大;將砂漿試樣變形破壞全過程聲發(fā)射分成三個階段,初始壓密彈性階段、屈服上升階段和破壞殘余階段;結(jié)合聲發(fā)射試驗數(shù)據(jù),提出了一種預測指標K,K值變化情況出現(xiàn)明顯的“回彈”現(xiàn)象,預示著砂漿試樣即將破壞。(2)預制鑄鐵、松木兩種夾芯材料的夾芯砂漿試樣,采用聲發(fā)射監(jiān)測技術監(jiān)測其單軸壓縮過程中聲發(fā)射信號,得到了配比與夾芯砂漿試樣的強度關系,夾芯砂漿試樣峰值強度均隨水泥與砂質(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度大于松木砂漿試樣的峰值強度;夾芯砂漿試樣的聲發(fā)射事件計數(shù)特征與聲發(fā)射能量特征變化趨勢相同;K值變化情況出現(xiàn)明顯的“回彈”現(xiàn)象,也能預測夾芯砂漿試樣破壞。(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),并對損傷演化方程進行修正,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.
【學位授予單位】：山東科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ177.6
本文編號：2137633
[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.
【學位授予單位】：山東科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ177.6
【參考文獻】
相關期刊論文 前10條
1 徐楊夢迪;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)射特征試驗研究[J];四川大學學報(工程科學版);2016年06期
2 溫韜;唐輝明;劉佑榮;鄒宗興;王康;林成遠;;影響因子修正的新型巖石損傷統(tǒng)計本構(gòu)模型[J];中國礦業(yè)大學學報;2016年01期
3 張黎明;任明遠;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];巖石力學與工程學報;2015年S1期
4 李心睿;徐清;謝紅強;肖明礫;何江達;;靜動載耦合作用下裂隙巖石損傷本構(gòu)及演化特征[J];巖石力學與工程學報;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;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價指標研究[J];巖石力學與工程學報;2015年06期
7 紀洪廣;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];巖石力學與工程學報;2015年04期
8 王云飛;黃正均;崔芳;;煤巖破壞過程的細觀力學損傷演化機制[J];煤炭學報;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)射特征試驗研究[J];巖石力學與工程學報;2014年10期
10 金解放;李夕兵;邱燦;陶偉;周學進;;巖石循環(huán)沖擊損傷演化模型及靜載荷對損傷累積的影響[J];巖石力學與工程學報;2014年08期
相關博士學位論文 前2條
1 汪亦顯;含水及初始損傷巖體損傷斷裂機理與實驗研究[D];中南大學;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;2012年
，本文編號：2137633
本文鏈接：http://sikaile.net/kejilunwen/huagong/2137633.html
