本文選題：粗粒土 + 高徑比�。� 參考：《中南大學學報(自然科學版)》2015年07期

【摘要】：基于離散元軟件PFC3D,通過編制可破碎的顆粒簇單元,模擬三軸試驗中不同高徑比試樣應(yīng)力應(yīng)變特性的差異,通過比較強度和變形參數(shù)差異探討適合粗粒土的高徑比。研究結(jié)果表明:高徑比越小,試驗得到的內(nèi)摩擦角越大,圍壓越大,由于顆粒破碎導致的內(nèi)摩擦角越小;滿足莫爾-庫侖準則破壞面的最小高徑比隨著圍壓的增加而減小,但都大于現(xiàn)在室內(nèi)試驗常用的高徑比;峰值強度隨著高徑比的增加而減小,隨著圍壓的增大,不同高徑比之間峰值強度相對誤差減小;割線模量與高徑比呈折線形關(guān)系;不同高徑比之間割線模量的差異隨高徑比范圍的不同而不同,且最小高徑比的割線模量與現(xiàn)在室內(nèi)試驗常用高徑比的割線模量在低圍壓下差異較大。依據(jù)模擬結(jié)果,認為粗粒土的三軸試樣高徑比應(yīng)大于2.5。
[Abstract]:Based on the discrete element software PFC3D, the differences of stress-strain characteristics of samples with different aspect ratios in triaxial tests were simulated by compiling broken particle cluster units. The ratio of height to diameter suitable for coarse grained soil was discussed by comparing the strength and deformation parameters. The results show that the smaller the ratio of height to diameter, the greater the angle of internal friction and the larger the confining pressure, the smaller the angle of internal friction due to particle breakage, and the smaller the minimum ratio of height to diameter of the failure surface satisfying the Mohr Coulomb criterion decreases with the increase of confining pressure. The peak strength decreases with the increase of the ratio of height to diameter, and decreases with the increase of confining pressure, and the relative error of peak strength between different ratio of height to diameter decreases, the relationship between Secant modulus and ratio of height to diameter is broken. The difference of Secant modulus between different aspect ratio is different with the range of height to diameter ratio, and the Secant modulus of the minimum aspect ratio is quite different from that of the height to diameter ratio commonly used in laboratory tests under low confining pressure. According to the simulation results, it is considered that the ratio of height to diameter of triaxial specimen should be greater than 2.5.
【作者單位】： 河海大學巖土力學與堤壩工程教育部重點實驗室;河海大學巖土工程科學研究所;香港理工大學土木工程系;
【基金】：國家重點基礎(chǔ)研究發(fā)展規(guī)劃(973計劃)項目(2013CB036404) 高等學校博士學科點專項科研基金資助項目(20110094110002) 高等學校學科創(chuàng)新引智計劃項目(B13024)~~
【分類號】：TU411

【參考文獻】

相關(guān)期刊論文 前10條

1 翁厚洋;朱俊高;余挺;王觀琪;;粗粒料縮尺效應(yīng)研究現(xiàn)狀與趨勢[J];河海大學學報(自然科學版);2009年04期

2 凌華;殷宗澤;朱俊高;蔡正銀;;堆石料強度的縮尺效應(yīng)試驗研究[J];河海大學學報(自然科學版);2011年05期

3 陽云華;趙e，

本文編號：1822093