| 黄土垂直节理细微观特征及发育机制探讨 |
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| 引用本文： | 冯立,张茂省,胡炜,董英,孟晓捷.黄土垂直节理细微观特征及发育机制探讨[J].岩土力学,2019,40(1):235-244. |
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| 作者姓名： | 冯立 张茂省 胡炜 董英 孟晓捷 |
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| 作者单位： | 中国地质调查局西安地质调查中心 国土资源部黄土地质灾害重点试验室，陕西 西安 710054 |
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| 基金项目： | 国土资源公益性行业科技专项经费项目(No. 201511056-4)；国家自然科学基金项目(No. 41530640)。 |
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| 摘 要： |
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| 关 键 词： | 垂直节理 结构单元 尺度转换 发育机制 |
| 收稿时间： | 2017-06-20 |
Discussion on microscopic,microcosmic characteristics and developmental mechanism of loess vertical joints |
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| FENG Li,ZHANG Mao-sheng,HU Wei,DONG Ying,MENG Xiao-jie.Discussion on microscopic,microcosmic characteristics and developmental mechanism of loess vertical joints[J].Rock and Soil Mechanics,2019,40(1):235-244. |
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| Authors: | FENG Li ZHANG Mao-sheng HU Wei DONG Ying MENG Xiao-jie |
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| Institution: | Key Laboratory of Geo-hazards in Loess Area, Ministry of Land and Resources, Xi’an Center of Geological Survey, Xi’an, Shaanxi 710054, China |
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| Abstract: | It is easy to observe the development of vertical joints of aeolian loess on the edge or shore of a plateau, and these vertical joints can readily induce loess disasters due to changes in the water environment. The vertical joints of loess were investigated in this study. The developmental laws of vertical joints of loess in horizontal and vertical directions were summarized based on their meso-microscopic developmental characteristics. The display forms, transformation mechanisms and the micro-mesoscopic structural basis for forming vertical joints of loess were observed on different evaluation scales. Based on the sedimentary dynamics of loess, the vertical developmental mechanism of vertical joints was discussed. Studies had shown that vertical joints formed gradually during the historical sedimentary process and were the product of diagenesis. It was proposed that the pore concentration zone and vertical tubular channel in loess were the micro-mesoscopic structural basis for the development of vertical joints, for which the results of a three-dimensional CT scanning test provided strong evidence. The vertical joints exhibit different forms on different evaluation scales. Under external actions (wet and dry cycling and loess pile thickening), the vertical joints in the micro-meso-sub-macro point of view can be developed in an upward scale (expansion characteristics) or downward scale (decay characteristics), and they can transform between the two scales. This is referred as the scale conversion mechanism. The vertical developmental mechanism of vertical joints of loess was also proposed based on this. |
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| Keywords: | vertical joints structural unit scale transformation developmental mechanism |
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