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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。
Moraine soil is a special geotechnical material produced by rapid mixed deposition of boulders, gravel, gravel, silt and clay during the melting of the glacier, and the engineering problems caused by it are increasingly influenced by the rock Geotechnical community attention. The meso-structure of gravel particles is a reflection of the unique sedimentary history of moraine soils, which directly affects the geotechnical properties of soils. However, since the original moraine soil samples are extremely difficult to obtain, geotechnical engineering has so far been rarely studied. In this regard, the use of artificial fine cutting method, the success of the Jade Dragon Snow Mountain Xilu undulating moraine soil samples, and the recovered 6 moraine soil samples were CT scans, for the first time won the inner moraine soil real Mesozoic group Construct images. After binarization and de-noising treatment of CT images with Matlab, the authors used the conventional statistical methods to describe the grading parameters such as gravel content, grain orientation and particle shape of the gravel particles in the moraine. The results show that the statistical differences between the vertical profiles are small, but the difference between the vertical profile and the horizontal profile is larger.