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为了得到较为真实的室内重塑砂土样,利用自制的落砂装置,开展一系列福建标准砂的砂雨法制样试验,研究落距、漏斗管径和细颗粒含量等因素对室内土工三轴试验砂样制备的影响。结果表明:砂样相对密度随落距的增加而增加,而增速随落距的增加逐渐变缓并趋于稳定;相同落距下,漏斗管径越大,砂样的相对密度越小;漏斗管径的减小,可以得到较宽范围的砂样密度;随着砂土中细颗粒含量的增加,制备的砂样相对密度减小。利用牛顿第二定律和能量守恒定律能够较好地阐释落距、漏斗管径和细颗粒含量等因素对砂土制样的影响规律。采用225k V-3D微分辨率ICT对砂雨法制备的砂样进行细观扫描,并借助Image J软件,重构砂样三维模型,计算出沿砂样高度方向的每层孔隙占比,验证了砂雨法制备砂样的空间均匀性,并给出砂雨法制备室内三轴试样的合理化建议。
In order to get a more realistic indoor remolded sand samples, a series of sand and rain sample preparation tests of Fujian standard sands were carried out by using self-made falling sand devices. The influences of factors such as fall distance, funnel diameter and fine particle content on the indoor geotechnical triaxial Impact of test sand preparation. The results show that the relative density of sand samples increases with the increase of the distance between the sand samples and the growth rate decreases with the increase of the drop distance and tends to be stable. The larger the tube diameter, the smaller the relative density of sand samples is. With the decrease of funnel diameter, a wider range of sand sample density can be obtained. With the increase of fine particles in sand, the relative density of sand sample decreases. Using the Newton’s second law and the law of conservation of energy, the effect of falling distance, funnel diameter and fine particle content on sand sample preparation can be well explained. Using the ICT with 225k V-3D micro-resolution ICT, the microscopic scanning of sand samples prepared by the sand and rain method was carried out. With the help of Image J software, the three-dimensional model of sand samples was reconstructed to calculate the proportion of each pore along the sample height. The spatial uniformity of the sand samples prepared by the sand-rain method was also discussed. The reasonable suggestions for preparing the triaxial samples by the sand-rain method were also given.