【摘要】：橡膠砂作為一種環(huán)保的巖土材料有廣泛的應(yīng)用前景。應(yīng)用三軸和單剪兩種試驗(yàn)方法對(duì)2種固結(jié)壓力下、7種配比橡膠砂的應(yīng)力-應(yīng)變特性、體變特性和模量衰減特性進(jìn)行了對(duì)比研究,結(jié)果表明:隨著橡膠顆粒含量的增加,橡膠砂模量降低,應(yīng)力-應(yīng)變曲線向應(yīng)變硬化型轉(zhuǎn)變,線性關(guān)系增強(qiáng);隨著橡膠顆粒含量的增加,橡膠砂剪脹特性減弱,剪縮增大;橡膠砂應(yīng)力-應(yīng)變關(guān)系可用擴(kuò)展鄧肯-張模型進(jìn)行模擬,模型參數(shù)受橡膠顆粒含量影響的規(guī)律明顯;隨著橡膠顆粒含量的增加,橡膠砂的靜剪切模量Gs與剪應(yīng)變?chǔ)们�降低,而橡膠砂模量衰減曲線Gs/G0-γ(G0為初始剪切模量)向大應(yīng)變方向偏移;三軸和單剪兩種試驗(yàn)方法得到的橡膠砂應(yīng)力-應(yīng)變特性、體應(yīng)變-剪應(yīng)變規(guī)律類似,但試驗(yàn)參數(shù)明顯受應(yīng)力狀態(tài)和應(yīng)力路徑的影響,兩者的差異主要表現(xiàn)為三軸試驗(yàn)得到的應(yīng)力-應(yīng)變曲線和模量曲線高于單剪試驗(yàn),產(chǎn)生這種差異的主要原因是由于前者的平均應(yīng)力相對(duì)較大。試驗(yàn)還得到了橡膠砂初始模量隨橡膠顆粒含量降低的經(jīng)驗(yàn)關(guān)系。
[Abstract]:Rubber sand as a kind of environmental protection geotechnical material has a wide application prospect. The stress-strain characteristics, bulk deformation characteristics and modulus attenuation characteristics of seven kinds of rubber sand under two kinds of consolidation pressures were studied by using triaxial and single-shear test methods. The results show that the content of rubber particles increases with the increase of rubber particle content. The modulus of rubber sand decreases, the stress-strain curve changes to strain-hardening type, and the linear relationship increases, and with the increase of rubber particle content, the dilatancy of rubber sand decreases and the shear shrinkage increases. The stress-strain relationship of rubber sand can be simulated by extended Duncan Chang model. The model parameters are affected by rubber particle content obviously, and the static shear modulus Gs and shear strain 緯 curve of rubber sand decrease with the increase of rubber particle content. However, the modulus attenuation curve of rubber sand G _ s / G _ 0- 緯 (G _ 0 is the initial shear modulus) deviates to the direction of large strain, and the stress-strain characteristics of rubber sand obtained by triaxial and single-shear methods are similar to those obtained by bulk strain-shear strain. But the test parameters are obviously affected by stress state and stress path. The difference between the two is that the stress-strain curve and modulus curve obtained by triaxial test are higher than those in single shear test. The main reason for this difference is that the average stress of the former is relatively large. The experimental results show that the initial modulus of rubber sand decreases with the content of rubber particles.
【作者單位】： 湖南工業(yè)大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(No.51108177) 湖南省自然科學(xué)基金(No.10JJ4040) 湖南工業(yè)大學(xué)自科基金項(xiàng)目(No.2012HZX20,No.2013HZX09)~~
【分類號(hào)】：TU41

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 傅強(qiáng);謝友均;龍廣成;錢智銘;;橡膠集料自密實(shí)混凝土的統(tǒng)計(jì)損傷本構(gòu)關(guān)系[J];四川大學(xué)學(xué)報(bào)(工程科學(xué)版);2014年04期

相關(guān)碩士學(xué)位論文 前1條

1 任東濱;土工格室加筋橡膠砂墊層動(dòng)力特性大尺寸循環(huán)單剪試驗(yàn)研究[D];湖南工業(yè)大學(xué);2015年

，

本文編號(hào)：2157712