砂雨法制备三轴砂样的影响因素及均匀性研究

发布时间：2018-04-28 14:15

本文选题：砂雨法 + 砂样制备　；参考：《长江科学院院报》2016年10期

【摘要】：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。
[Abstract]:In order to obtain more real indoor remolded sand samples, a series of sand rain method tests of Fujian standard sand were carried out by using self-made sand falling device, and the falling distance was studied. The influence of the diameter of funnel pipe and fine particle content on the preparation of sand samples in laboratory geotechnical triaxial test. The results show that the relative density of sand sample increases with the increase of drop distance, and the increase of sand sample increases gradually with the increase of drop distance, and the same drop distance, the larger the diameter of funnel tube, the smaller the relative density of sand sample, the smaller the diameter of funnel pipe, the smaller the diameter of funnel tube, the smaller the relative density of sand sample is. A wide range of sand sample density can be obtained, and the relative density of sand sample decreases with the increase of fine grain content in sand soil. By using Newton's second law and energy conservation law, the influence of falling distance, funnel diameter and fine particle content on sand sample preparation can be well explained. The sand samples prepared by sand rain method were scanned by 225k V-3D microresolution ICT. With the help of Image J software, the 3D model of sand samples was reconstructed, and the porosity ratio of each layer along the direction of sand sample height was calculated. The spatial uniformity of sand samples prepared by sand rain method was verified. The rational suggestions for the preparation of indoor triaxial specimens by sand rain method are also given.
【作者单位】：安徽理工大学土木建筑学院;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;常州工学院土木建筑工程学院;长江科学院水利部岩土力学与工程重点实验室;
【基金】：国家自然科学基金项目(51579237,51309027) 江苏省自然科学基金项目(BK20131141) 深部岩土力学与地下工程国家重点实验室基金项目(SKLGDUEK1110)
【分类号】：TU411

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