本文選題：單調扭剪 + 循環(huán)扭剪��； 參考：《巖土力學》2017年01期

【摘要】：通過空心圓柱扭剪儀對不同相對密實度的飽和南京砂分別進行了單調扭剪不排水、排水試驗以及循環(huán)扭剪不排水試驗。試驗結果表明:在單調扭剪試驗中,試樣相轉換線的位置與排水條件無關,但相對密實度較大試樣的相轉換線斜率小于相對密實度較小的試樣。在循環(huán)扭剪不排水試驗中,對于相對密實度較小的試樣,當其有效應力路徑接近單調扭剪荷載作用下具有相同初始條件試樣的相轉換線時,孔壓急劇增加,扭剪應變迅速增大,試樣出現(xiàn)不穩(wěn)定現(xiàn)象,隨后發(fā)生初始液化;對于相對密實度較大的試樣,當其有效應力路徑接近單調扭剪荷載作用下試樣的相轉換線時,試樣出現(xiàn)循環(huán)活動現(xiàn)象,隨著循環(huán)扭剪荷載的繼續(xù)施加,有效應力路徑表現(xiàn)為以破壞線為邊界且呈"蝴蝶"形狀的一系列重疊的回滯環(huán),此時孔壓在某一常值上下波動,累積孔壓不再增加。具有相同初始條件的試樣在循環(huán)和單調扭剪荷載作用下得到的相轉換線幾乎相同,這一規(guī)律不受相對密實度的影響。
[Abstract]:Through the hollow cylindrical torsional shear apparatus, the monotone torsional shear undrained test, the draining test and the cyclic torsional shear undrained test were carried out on the saturated Nanjing sand with different relative compactness. The results show that in the monotone torsional shear test, the position of the phase transition line is independent of the drainage condition, but the slope of the phase conversion line of the sample with the larger relative density is smaller than that of the sample with the lower relative compactness. In the cyclic torsional shear undrained test, when the effective stress path is close to the phase transition line of the specimen with the same initial condition under monotone torsional shear load, the pore pressure increases sharply and the torsional shear strain increases rapidly. When the effective stress path is close to the phase transition line of the specimen under monotone torsional shear load, the sample appears the phenomenon of cyclic activity, and the initial liquefaction occurs when the specimen is unstable, and then the initial liquefaction occurs, and when the effective stress path is close to the phase transition line of the specimen under monotone torsional shear load, With the continuous application of cyclic torsional shear load, the effective stress path is shown as a series of overlapping hysteresis loops with the boundary of failure line as the boundary and the shape of "butterfly". Under this condition, the pore pressure fluctuates up and down at a constant value, and the cumulative pore pressure does not increase. The phase transfer lines of specimens with the same initial conditions are almost the same under cyclic and monotone torsional shear loads, and this rule is not affected by relative compactness.
【作者單位】： 浙江大學濱海和城市巖土工程研究中心;溫州大學建筑工程學院;溫州大學浙江省軟弱土地基與海涂圍墾工程技術重點實驗室;
【基金】：國家自然科學基金項目(No.51508417,No.51238009,No.51278383)~~
【分類號】：TU411

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