泾阳原状黄土–古土壤序列抗剪强度各向异性及其机制研究

doi:10.13722/j.cnki.jrme.2019.0319

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摘要通过对陕西省泾阳南塬修石渡剖面(S9～L0)每隔1 m的系统取样，进行不同和相同垂直压力下的直剪试验，微观结构观察及含水率、干密度和孔隙率等物理性质的测试，研究原状黄土抗剪强度的各向异性特征及其形成机制和影响因素。结果表明：黄土结构参数与其抗剪强度表现出不同的各向异性特征；对于L7以上的土层，垂直方向的抗剪强度基本大于水平方向抗剪强度，而L7及以下土层垂直与水平抗剪强度的比值小于1；古土壤层抗剪强度各向异性的程度强于对应黄土层；影响黄土–古土壤序列抗剪强度各向异性的因素主要有孔隙率和含水率，孔隙率对水平抗剪强度的影响较为显著，而含水率对抗剪强度各向异性的影响与孔隙率相反；干密度与抗剪强度的大小成正比，但对其各向异性的影响不大。原状黄土抗剪强度之所以具有各向异性的特征，其根本原因是由于沉积过程中土颗粒不同的排列方式以及剪切过程中土颗粒的旋转和重新排列所致。

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关键词 ：土力学, 抗剪强度, 各向异性, 影响因素, 形成机制, 修石渡剖面

Abstract：System sampling was conducted with an interval of 1 meter at Xiushidu section of Jingyang south plateau，Guanzhong Basin，Shaanxi. Direct shear test was executed under different or same vertical pressures，and microstructure and basis physical properties including dry density，moisture content and porosity were tested. The anisotropic characteristics of the shear strength of undisturbed loess were studied，and their formation mechanisms and influencing factors were also analyzed. The results show that the structural parameters of loess present different anisotropy characteristics as well as the shear strength. The vertical shear strength is generally greater than the horizontal shear strength for the layers above L7，while the ratio of the vertical shear strength to the horizontal shear strength for L7 and below layers is less than 1. The anisotropy degree of paleosol is larger than that of corresponding loess. The main influencing factors on shear strength anisotropy of loess-paleosol sequence are the porosity and the moisture content. The effect of the porosity on the horizontal shear strength is greater than that on the vertical shear strength，while the water content is opposite. The dry density is directly proportional to the shear strength but has little effect on the anisotropy of the shear strength. The shear strength anisotropy of natural loess is due to different arrangements of soil particles by aeolian deposition and rotation and rearrangement of particles during shearing.

Key words： soil mechanics shear strength anisotropy influencing factors formation mechanism Xiushidu section

引用本文:

张奇莹1，2，徐盼盼1，2，钱会1，2. 泾阳原状黄土–古土壤序列抗剪强度各向异性及其机制研究[J]. 岩石力学与工程学报, 2019, 38(11): 2365-2376.
ZHANG Qiying1，2，XU Panpan1，2，QIAN Hui1，2. Study on shear strength anisotropy of undisturbed loess-paleosol sequence in Jingyang county#br#. , 2019, 38(11): 2365-2376.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0319 或 http://www.rockmech.org/CN/Y2019/V38/I11/2365

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