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- 저자 : Sixiang Ling (검색결과 3 건)
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Sixiang Ling,Xiyong Wu,Chunwei Sun,Xin Liao,Yong Ren,Xiaoning Li 한국지질과학협의회 2016 Geosciences Journal Vol.20 No.6
This paper reports a geochemical study on the mineralogy and major elements of mid-ridge (A), near mountaintop (B), and valley (C) profiles developed in the Lower Cambrian black shale in Northeast Chongqing, China. The primary objective was to understand the elemental mobility, mineralogical transformation, and weathering progression during black shale chemical weathering in a subtropical climate. Profiles A, B, and C are characterized as weak, weak to moderate, and moderate to intense in terms of weathering intensity, respectively, by the Chemical Index of Alteration (CIA). Results indicate that most elements were mobilized by acidic solutions produced during the oxidation of pyrite and organic matter (OM). Among the major elements, Si was slightly enriched in profile A, but depleted through desilication in profile B and C. Al was enriched in the regolith zone in profile A and C, and Fe was enriched at the oxic front because of secondary clay and sesquioxide formation. The addition and depletion of major elements and the depth of the oxic front increased with the degree of weathering. Gypsum and Fe- (hydro-) oxides were observed to form and re-precipitate in the saprock and fractured shale zones. Clay minerals formed from dissolution of plagioclase and the transformation of other labile clay minerals during weathering. The progressive changes in mineralogical composition of weathered material from profile A to C showed the sequence of mineral decomposition with degree of weathering: first, oxidation of pyrite and OM; then Ca and Mg were removed during dissolution of carbonatite; followed by removal of Na from dissolution of plagioclase; lastly, transformation of clay minerals during weathering; meanwhile, desilication occurs at moderate to intense weathering stages.
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( Sixiang Ling ),( Masahiro Chigira ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
A comprehensive analysis of the distribution of landslides induced by the 1968 M7.9 Tokachi-Oki earthquake and historical strong earthquake in pyroclastic fall deposits was conducted in Hachinohe, northeast Japan. 314 coseismic landslides in 1968 Tokachi-Oki earthquake and 914 older landslides were precisely identified through interpretations of high-resolution aerial photograph and 0.5-m Light Detection And Ranging (LiDAR) data in a 36.3 km2 area. The results indicate that these earthquake-induced landslides primarily clustered near ridge crests or ridge shoulders. Via GIS-based analysis on LiDAR map, geometric parameters of 314 coseismic landslides were obtained, including height, length, width, apparent friction angle (arc tangent of the height-length ratio), and length-width ratio. The fitting relationship between height and length of the 1968 coseismic landslides was H = 0.226L, with a modal apparent friction angle of 12° ~ 14°. The 1968 coseismic landslides mostly occurred on gentle slopes lower than 30º with average slope angle of 26.4º. It suggests that these earthquake-induced landslides of pyroclastic fall deposits are thus highly mobile, even in cases of small landslide volumes. Statistics analysis of morphology of 1968 coseismic landslide, older landslide, and hillslope demonstrates that the cluster of landslide oriented in a northwest-north-east direction, which appears to be related to the relative positions of the shock epicenters. Such phenomenon is greatly controlled by the seismic Arias intensity direction, seismic particle motion, and hillslope morphology. This study provides a framework for susceptibility investigation of earthquake-induced landslides relation to sensitive pyroclastic fall deposits materials.
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Experimental Study on the Effect of Black Shales and Water Interactions on Concrete
( Xin Liao ),( Qingfeng Wang ),( Sixiang Ling ),( Xiyong Wu ),( Wenda Zhang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Black shales, usually containing pyrite, are easily oxidized and generate acidic porewater. This acidic environment is non favorable for tranditional engineering material, e.g., concrete, and is likely to affect the durability of the engineering structure. This study investigated the corrsions of concrete by acid water from black shale at different immersion depth. Electrical conductivity (EC) and pH values of the solution were monitored at intervals. Concentrations of major ion species were determined for immersion solutions. Micro-fissure development within the rock and concrete samples were determined by comparing the ultrasonic before and after the immersion tests. Mineral and strength analysis was conducted with X-ray diffraction and uniaxial compressive strength apparatus. The results indicate that: 1) capillary action was significant for the water-solid interactions of black shale and concrete, where the chemical reaction of black shale mainly occurred; 2) the immersion solution caused corrosion in the surface of black shale and concrete, which dramatically reduced the compressive strength of black shale but increased that of concrete slightly in the immersion period. This change can be attributed to the products formed by the chemical reaction between the sulfate-rich ion solution and concrete filled in pore structure.
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