【摘要】：冰磧土是冰川行進(jìn)融化過(guò)程中漂石、碎石、砂礫、粉土和黏土在毫無(wú)分選的條件下快速混雜堆積生成的一種特殊巖土材料,由其引發(fā)的工程問(wèn)題日益受到巖土工程界關(guān)注。礫石顆粒細(xì)觀組構(gòu)是冰磧土獨(dú)特沉積歷史的反映,直接影響土體的巖土力學(xué)性質(zhì),但迫于原狀冰磧土樣極難取得,巖土工程領(lǐng)域迄今罕有研究。對(duì)此,采用人工精細(xì)切削的方式,成功取得了玉龍雪山西麓原狀冰磧土樣,并對(duì)取回的6塊冰磧土原狀樣進(jìn)行了CT掃描,首次獲得了冰磧土內(nèi)部真實(shí)細(xì)觀組構(gòu)圖像。借助Matlab對(duì)CT圖片進(jìn)行二值化和消噪處理后,運(yùn)用常規(guī)統(tǒng)計(jì)方法對(duì)冰磧土內(nèi)礫石顆粒的面含石量、顆粒定向以及顆粒形狀等剖面組構(gòu)指標(biāo)進(jìn)行了描述。結(jié)果表明,垂直剖面之間的統(tǒng)計(jì)數(shù)據(jù)差異較小,但垂直剖面與水平剖面之間差異較大。
[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.
【作者單位】： 中國(guó)科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(No.41172286) 廣西巖土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室資助課題(No.11-KF-03)
【分類(lèi)號(hào)】：TU445

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