堆石體在真三軸應(yīng)力狀態(tài)下的非共軸性與剪脹特性
發(fā)布時間：2018-08-29 10:30
【摘要】：基于連續(xù)-離散耦合分析方法,發(fā)展隨機(jī)顆粒不連續(xù)變形分析方法。采用不規(guī)則多面體模擬實際堆石顆粒,制備初始各向同性的堆石料數(shù)值試樣,進(jìn)行等平均靜水壓力p、等中主應(yīng)力系數(shù)b應(yīng)力路徑的真三軸數(shù)值試驗。分析堆石料在真三軸應(yīng)力狀態(tài)下的剪脹特性,以及應(yīng)變增量與應(yīng)力增量的非共軸性。研究結(jié)果表明:剛開始加載時,應(yīng)變增量與應(yīng)力增量共軸,隨著加載的進(jìn)行,應(yīng)變增量的方向發(fā)生偏轉(zhuǎn),偏轉(zhuǎn)量與中主應(yīng)力系數(shù)b有關(guān),在三軸壓縮應(yīng)力路徑(b=0)和三軸拉伸應(yīng)力路徑(b=1)時,幾乎不發(fā)生偏轉(zhuǎn);對比Rowe,Roscoe,改進(jìn)的Roscoe以及Lagioia剪脹模型,改進(jìn)的Roscoe剪脹模型預(yù)測的剪脹曲線與數(shù)值試驗結(jié)果較吻合,在改進(jìn)的Roscoe剪脹模型上引入1個角隅函數(shù),以反映中主應(yīng)力對剪脹特性的影響。
[Abstract]:Based on the continuous-discrete coupling analysis method, the random particle discontinuous deformation analysis method is developed. Using irregular polyhedron to simulate the actual rockfill particles, the initial isotropic numerical specimens of rockfill were prepared, and the true triaxial numerical tests of the iso-mean hydrostatic pressure p and the isometric principal stress coefficient b stress path were carried out. The shear expansion characteristics of rockfill under true triaxial stress and the non-coaxial properties of strain increment and stress increment are analyzed. The results show that at the beginning of loading, the strain increment is coaxial with the stress increment. With the loading, the direction of the strain increment deflects, and the deflection is related to the coefficient b of the middle principal stress. In the case of triaxial compression stress path (b0) and triaxial tensile stress path (bt1), there is almost no deflection. Compared with the Rowe,Roscoe, improved Roscoe and Lagioia shear expansion models, the predicted shear expansion curve of the modified Roscoe expansion model is in good agreement with the numerical test results. A corner function is introduced to the improved Roscoe expansion model to reflect the effect of the principal stress on the dilatancy.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國家重點實驗室;武漢大學(xué)水工巖石力學(xué)教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51379161,51509190) 中央高校基本科研業(yè)務(wù)費專項資金資助項目(2042015kf0022) 博士后科學(xué)基金面上資助項目(2015M572195)~~
【分類號】：TV41
，
本文編號：2210928
[Abstract]:Based on the continuous-discrete coupling analysis method, the random particle discontinuous deformation analysis method is developed. Using irregular polyhedron to simulate the actual rockfill particles, the initial isotropic numerical specimens of rockfill were prepared, and the true triaxial numerical tests of the iso-mean hydrostatic pressure p and the isometric principal stress coefficient b stress path were carried out. The shear expansion characteristics of rockfill under true triaxial stress and the non-coaxial properties of strain increment and stress increment are analyzed. The results show that at the beginning of loading, the strain increment is coaxial with the stress increment. With the loading, the direction of the strain increment deflects, and the deflection is related to the coefficient b of the middle principal stress. In the case of triaxial compression stress path (b0) and triaxial tensile stress path (bt1), there is almost no deflection. Compared with the Rowe,Roscoe, improved Roscoe and Lagioia shear expansion models, the predicted shear expansion curve of the modified Roscoe expansion model is in good agreement with the numerical test results. A corner function is introduced to the improved Roscoe expansion model to reflect the effect of the principal stress on the dilatancy.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國家重點實驗室;武漢大學(xué)水工巖石力學(xué)教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51379161,51509190) 中央高校基本科研業(yè)務(wù)費專項資金資助項目(2042015kf0022) 博士后科學(xué)基金面上資助項目(2015M572195)~~
【分類號】：TV41
，
本文編號：2210928
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