本文關(guān)鍵詞：DDARF多尺度網(wǎng)格劃分方法及其應(yīng)用　出處：《現(xiàn)代隧道技術(shù)》2014年04期 　論文類型：期刊論文

  更多相關(guān)文章： 多尺度網(wǎng)格 裂隙擴展 室內(nèi)試驗 地下洞室

【摘要】：為優(yōu)化非連續(xù)變形分析(Discontinuous Deformation Analysis for Rock Failure)中計算精度和計算時間的關(guān)系,文章提出了DDARF多尺度網(wǎng)格劃分方法,分別建立了多尺度網(wǎng)格和均勻網(wǎng)格的單軸壓縮模型,并進行了數(shù)值試驗和室內(nèi)試驗的對比;將多尺度網(wǎng)格劃分方法應(yīng)用于大型地下洞室開挖,對洞室附近區(qū)域進行了針對性研究。結(jié)果表明:DDARF多尺度網(wǎng)格與均勻網(wǎng)格模型單軸壓縮試驗相比,網(wǎng)格數(shù)量相同時提高了裂隙附近的計算精度,裂隙擴展規(guī)律與室內(nèi)試驗更為吻合;多尺度網(wǎng)格劃分方法應(yīng)用于地下洞室的開挖,在相同計算精度下減少了計算時間,提高了效率,位移規(guī)律和FLAC計算結(jié)果吻合度較高;多尺度網(wǎng)格劃分方法完善并加強了DDARF模擬巖體裂隙擴展的功能,對大型巖土工程穩(wěn)定性的優(yōu)化分析具有重要的實用意義。
[Abstract]:Discontinuous Deformation Analysis for Rock failure to optimize discontinuous deformation analysis. The relation between calculation precision and calculation time in the paper. In this paper, the method of DDARF multi-scale mesh generation is proposed, and the uniaxial compression models of multi-scale mesh and uniform grid are established, and the comparison between numerical experiments and laboratory tests is carried out. The multi-scale mesh generation method is applied to the excavation of large underground caverns, and a targeted study on the area near the cavern is carried out. The results show that the multi-scale meshes are compared with the uniaxial compression tests of the uniform mesh model. When the number of meshes is the same, the accuracy of calculation near the crack is improved, and the law of crack expansion is more consistent with the laboratory test. The method of multi-scale mesh is applied to the excavation of underground cavern. The calculation time is reduced and the efficiency is improved under the same calculation precision. The displacement law is in good agreement with the result of FLAC calculation. The method of multi-scale meshing improves and strengthens the function of DDARF to simulate the crack expansion of rock mass, which is of great practical significance to the optimization analysis of the stability of large geotechnical engineering.
【作者單位】： 山東大學(xué)巖土與結(jié)構(gòu)工程研究中心;
【基金】：國家自然科學(xué)基金重點項目(No.51139004) 教育部博士點基金(No.20110131110030) 山東省自然科學(xué)基金重點項目(No.ZR2009AZ001) 中國博士后科學(xué)基金面上項目(2012M521339)
【分類號】：TU452
【正文快照】： 數(shù)值計算中,綜合運用多種手段建立高質(zhì)量、高計算效率的模型是極其重要的一個步驟。網(wǎng)格劃分的形式對計算精度和計算時間將產(chǎn)生直接影響[1~4]。網(wǎng)格密度增加,計算精度會相應(yīng)有所提高,但同時計算時間也會增加;當網(wǎng)格密度增加到一定程度后,計算精度趨于平穩(wěn);網(wǎng)格密度繼續(xù)增加,計

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1 馬海萍;不同產(chǎn)狀節(jié)理對巖體特性的影響及工程應(yīng)用[D];山東大學(xué);2012年

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