本文選題：采礦工程 + 顆粒性質(zhì)��； 參考：《巖石力學(xué)與工程學(xué)報》2017年08期

【摘要】：尾礦的力學(xué)特性與粉粒含量有關(guān),但目前對粉粒含量的影響機制研究較少。為了研究粉粒含量對尾礦力學(xué)性質(zhì)的影響及其細(xì)觀機制,通過顯微觀測、三軸試驗和離散元模擬,研究砂粒和粉粒的顯微特征,分析尾礦的臨界粉粒含量,并討論粉粒含量效應(yīng)的細(xì)觀力學(xué)機制。結(jié)果表明:砂粒和粉粒在粒徑分布、棱角性和表面形貌方面存在差異,粒徑小于30μm的顆粒具有獨特的顯微特征;隨著粉粒含量的增加,混合尾礦逐漸由砂性尾礦過渡到粉性尾礦,臨界粉粒含量在30%~50%范圍;理論推導(dǎo)證明,粉粒的粒徑和彈性模量越小,相同力作用下的土體形變越大;從介觀上看,粉粒含量的增加弱化了原有的強力鏈,是導(dǎo)致粉粒含量效應(yīng)的重要原因。研究結(jié)果揭示了混合尾礦的細(xì)觀力學(xué)行為機制,為宏細(xì)觀關(guān)聯(lián)性研究提供了參考。
[Abstract]:The mechanical properties of tailings are related to the content of silt, but the mechanism of influence on the content of silt is less studied at present. In order to study the effect of silt content on the mechanical properties of tailings and its meso-mechanism, the microscopic characteristics of sand and silt were studied by microscopic observation, triaxial test and discrete element simulation, and the critical silt content of tailings was analyzed. The mesomechanical mechanism of powder content effect is also discussed. The results show that there are differences in particle size distribution, angularity and surface morphology between sand particles and silt particles. The mixed tailings gradually transition from sand tailings to silt tailings, and the critical particle content is in the range of 30% or 50%. The theoretical derivation shows that the smaller the particle size and elastic modulus, the larger the soil shape under the same force. The increase of powder content weakens the original strong chain and is an important reason for the effect of powder content. The results reveal the mechanism of mesomechanical behavior of mixed tailings and provide a reference for the study of macro-meso-correlation.
【作者單位】： 重慶大學(xué)煤礦災(zāi)害動力學(xué)與控制國家重點實驗室;中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點實驗室;昆明理工大學(xué)國土資源工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51234004,51004099,41602307)~~
【分類號】：TD926.4
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本文編號：2098960