本文選題：非連續(xù)變形分析(DDA) + 精度　； 參考：《巖土力學(xué)》2017年06期

【摘要】：由石根華提出的非連續(xù)變形分析(DDA)方法理論嚴(yán)密且計(jì)算較為高效,在模擬塊體滑移、轉(zhuǎn)動和張開等大變形、大位移問題方面具備獨(dú)特優(yōu)勢,因而在巖土工程領(lǐng)域得到了廣泛運(yùn)用。然而DDA方法在提出初期不可避免地存在一些精度問題,對此石根華及國內(nèi)外學(xué)者就問題產(chǎn)生原因和改進(jìn)方法開展了大量研究工作。基于部分相關(guān)成果的研究學(xué)習(xí),對改進(jìn)原始DDA計(jì)算精度的各類方法進(jìn)行歸納探討,主要包括:(1)DDA塊體內(nèi)部應(yīng)力位移場的精度控制;(2)塊體接觸問題處理方法的改進(jìn);(3)人為參數(shù)的合理選取;(4)能量耗散機(jī)制的考慮;(5)人工邊界的改進(jìn)等方面。對以上方法的改進(jìn)效果和計(jì)算效率進(jìn)行了簡要分析和討論,在此基礎(chǔ)上對DDA的研究熱點(diǎn)和發(fā)展趨勢進(jìn)行了概述,為該方法的進(jìn)一步發(fā)展和完善提供思路。
[Abstract]:The method of discontinuous deformation analysis proposed by Shi Genhua is rigorous in theory and efficient in calculation. It has unique advantages in simulating large deformation, such as block slip, rotation and opening, and large displacement. Therefore, it is widely used in geotechnical engineering field. However, some precision problems inevitably exist in the initial stage of the DDA method, which has been studied by Shi Genhua and scholars at home and abroad on the cause of the problem and the improvement of the method. Based on the research and learning of some related results, various methods to improve the accuracy of original DDA calculation are summarized and discussed. This paper mainly includes the precision control of stress and displacement field in the DDA block (1) the improvement of the method of dealing with the problem of block contact 3) the reasonable selection of artificial parameters (4) the consideration of energy dissipation mechanism and the improvement of artificial boundary, etc. The improvement effect and computational efficiency of the above methods are briefly analyzed and discussed. On this basis, the research hotspots and development trends of DDA are summarized, which provides ideas for the further development and improvement of the method.
【作者單位】： 武漢大學(xué)土木建筑工程學(xué)院巖土與結(jié)構(gòu)工程安全湖北省重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(No.2014CB046904) 國家自然科學(xué)基金重點(diǎn)項(xiàng)目(No.41130742)~~
【分類號】：TU43;TU452

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 趙榮軍;異常面積計(jì)算[J];物探與化探;2000年02期

，

本文編號：2003710