【摘要】：利用空心圓柱扭剪儀對(duì)飽和砂土進(jìn)行了應(yīng)力主軸固定和偏應(yīng)力比增大(即定向剪切)、偏應(yīng)力比不變和應(yīng)力主軸單調(diào)旋轉(zhuǎn)(即純應(yīng)力主軸單調(diào)旋轉(zhuǎn))、偏應(yīng)力比和應(yīng)力主軸偏轉(zhuǎn)角同時(shí)增加、偏應(yīng)力比和應(yīng)力主軸偏轉(zhuǎn)角分段增加4個(gè)系列的排水剪切試驗(yàn),著重分析不同應(yīng)力路徑下飽和砂土的變形特性及主應(yīng)力和主應(yīng)變?cè)隽糠较蜃兓?guī)律。試驗(yàn)結(jié)果表明,純應(yīng)力主軸單調(diào)旋轉(zhuǎn)下,主應(yīng)力增量方向在45°~135°范圍內(nèi)變化,主應(yīng)變?cè)隽糠较蛑饾u偏向主應(yīng)力方向;偏應(yīng)力比和應(yīng)力主軸偏轉(zhuǎn)角同時(shí)增加下,砂土變形不斷增大,當(dāng)主應(yīng)力增量方向????45°時(shí),主應(yīng)變?cè)隽糠较蚺c主應(yīng)力增量方向基本一致,但當(dāng)????45°時(shí),主應(yīng)變?cè)隽糠较蛑饾u偏離主應(yīng)力增量方向。當(dāng)應(yīng)力狀態(tài)在偏應(yīng)力比?≤0.75、應(yīng)力主軸偏轉(zhuǎn)角?≤45°范圍內(nèi)時(shí),體應(yīng)變、最大剪應(yīng)變與應(yīng)力路徑無(wú)關(guān),且后期純應(yīng)力主軸旋轉(zhuǎn)下砂土變形不受前期加載歷史的影響。
[Abstract]:The hollow cylindrical torsional shear apparatus was used to fix the stress spindle and increase the deflection stress ratio (i.e. directional shear) of saturated sand. The deflection stress ratio was invariable and the stress spindle rotated monotonously (that is, the pure stress spindle rotated monotonously), and the deflection stress ratio was increased. The deflection angle of the force spindle increases at the same time, In this paper, four series of drainage shear tests are carried out to increase the deflection stress ratio and the deflection angle of the principal axis. The deformation characteristics of saturated sand under different stress paths and the variation law of principal stress and principal strain increment direction are analyzed. The experimental results show that the direction of principal stress increment changes in the range of 45 擄~ 135 擄, the direction of principal strain increment gradually deviates to the direction of principal stress, and the deformation of sand increases with the increase of the deflection stress ratio and the deflection angle of the stress spindle at the same time, when the pure stress spindle rotates monotonously, the direction of principal stress increment changes from 45 擄to 135 擄. When the principal stress increment direction is -45 擄, the principal strain increment direction is basically the same as the principal stress increment direction, but when the principal strain increment direction is -45 擄, the principal strain increment direction gradually deviates from the principal stress increment direction. When the stress state is in the range of deflection stress ratio 鈮，

本文編號(hào)：2261885