玉龙雪山西麓原状冰碛土CT扫描试验研究

发布时间：2019-02-26 20:59

【摘要】：冰碛土是冰川行进融化过程中漂石、碎石、砂砾、粉土和黏土在毫无分选的条件下快速混杂堆积生成的一种特殊岩土材料,由其引发的工程问题日益受到岩土工程界关注。砾石颗粒细观组构是冰碛土独特沉积历史的反映,直接影响土体的岩土力学性质,但迫于原状冰碛土样极难取得,岩土工程领域迄今罕有研究。对此,采用人工精细切削的方式,成功取得了玉龙雪山西麓原状冰碛土样,并对取回的6块冰碛土原状样进行了CT扫描,首次获得了冰碛土内部真实细观组构图像。借助Matlab对CT图片进行二值化和消噪处理后,运用常规统计方法对冰碛土内砾石颗粒的面含石量、颗粒定向以及颗粒形状等剖面组构指标进行了描述。结果表明,垂直剖面之间的统计数据差异较小,但垂直剖面与水平剖面之间差异较大。
[Abstract]:Moraine soil is a kind of special geotechnical material, which is formed by the rapid mixed accumulation of drift stone, gravel, silty soil and clay in the process of glacier melting. The engineering problems caused by it have been paid more and more attention in geotechnical engineering field. The micro-fabric of gravel particles is a reflection of the unique depositional history of moraine soil, which directly affects the geotechnical mechanical properties of soil. However, it is very difficult to obtain the original moraine soil samples. So far, there have been few studies in geotechnical engineering field. In view of this, the undisturbed moraine samples at the western foot of Yulong Xueshan Mountain were successfully obtained by means of artificial fine cutting, and the original samples of 6 moraine soils were scanned by CT, and the true meso-fabric images of the moraine soil were obtained for the first time. After binarization and de-noising of CT images by Matlab, the profile fabric indexes of gravel particles in moraine soil, such as surface content of gravel, grain orientation and particle shape, were described by using conventional statistical methods. The results show that the statistical difference between the vertical section and the horizontal section is small, but the difference between the vertical section and the horizontal section is large.
【作者单位】：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;
【基金】：国家自然科学基金资助项目(No.41172286) 广西岩土力学与工程重点实验室资助课题(No.11-KF-03)
【分类号】：TU445

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