(1. 華北理工大學(xué) 礦業(yè)工程學(xué)院，唐山 063210;
2. 北京科技大學(xué) 土木與資源工程學(xué)院，北京 100083)
摘 要: 采用槳式流變儀研究了不同質(zhì)量濃度、灰砂比充填料漿在剪切條件下的觸變行為，借助量綱齊次性原理，推導(dǎo)并提出了基于量綱分析的觸變性預(yù)測模型。結(jié)果表明：濃度不同的料漿在觸變形態(tài)上有差異，高濃度料漿剪切應(yīng)力的波動(dòng)性更強(qiáng)；觸變性與質(zhì)量濃度和灰砂比均呈非線性正相關(guān)，且水泥比尾砂更能引發(fā)觸變；剪切過程中，表觀黏度先急速下降，然后維持平穩(wěn)，最后急劇上升，但結(jié)束瞬間的最終值小于初始值；質(zhì)量濃度為64%的料漿剪切應(yīng)力在剪切速率轉(zhuǎn)折點(diǎn)前呈不規(guī)則“U”字型，其他組剪切應(yīng)力基本以剪切速率轉(zhuǎn)折點(diǎn)為中心左右對(duì)稱。設(shè)計(jì)實(shí)驗(yàn)對(duì)預(yù)測模型進(jìn)行驗(yàn)證，結(jié)果顯示平均誤差率為6.2%，且適應(yīng)性良好。
關(guān)鍵字: 充填料漿；剪切；觸變行為；量綱；預(yù)測模型
（1. College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China;
2.School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:The thixotropic behavior of filling slurry with different concentration and cement-sand ratio was studied by paddle rheometer. The thixotropy prediction model based on dimensional analysis was proposed. The results show that the thixotropic morphologies of slurry with different concentration are different, and the shear stress of slurry with high concentration is more fluctuating. The thixotropy is positively correlated with concentration and cement-sand ratio, and the cement can induce thixotropy more than tailings. During the shear process, the apparent viscosity first decreases rapidly, then maintains stable, and finally rises sharply, but the final value is less than the initial value. The shear stress of the slurry with mass concentration of 64% presents an irregular “U” shape before the turning point while the other groups, however, are basically symmetric around the turning point. The experiments are designed to verify the prediction model, and the results show that the average error rate is 6.2%, with good adaptability.
Key words: filling slurry; shear; thixotropic behavior; dimensional; prediction model
