含粘粒砂土抗液化性能的试验研究

通过对含粘粒砂土所作的试验研究, 包括: 粘粒矿物成分不同、粘粒含量不同的重塑土样所作的室内动三轴试验; X光衍射试验, 试验结果对比分析后, 得出了含粘粒砂土抗液化性能的特性。并得出以下结论: (1)粘粒矿物成分不同, 也引起砂土动力稳定性的变化; (2 )动剪应力强度与粘粒含量并非呈单调增加关系, 而呈抛物线型, 并给出回归方程; (3)含粘粒的砂土, 其抗液化能力最低点总是在粘粒含量 8.5～ 9.5 %之间。

EXPERIMENTAL STUDY OF LIQUEFACTION-RESISTANT CHARACTERISTICS OF CLAYEY SAND

Presented in this paper are the results of experimental study and analysis of liquefaction characteristics of clayey sand .The laboratory tests on soil samples after prepared with the same dry density and different clay mineralogical composition and different content of clay particles were so as to determine the main parameters which affect the liquefaction behaviour of clayey sand .The tests were performed run on DSD-200 type dynamic triaxial device. X-ray diffraction analysis was also performed. By comparison of the obtained data, the following conclutions are drawn out: (1) the liquefaction-resistant characteristic of clayey sand varies with different clay mineralogical composition; (2)the relation between the dynamic shear strength and the clay particles is not monotonous, but is parabolic and a regression equation for the parabola is given presented by the authors;(3)when the clay particle content is between 8.5～9.5%, the clayey sand is weakest liquefaction-resistant.