| 红山窑风化红砂岩膨胀机制微细观分析 |
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| 引用本文： | 何山,朱珍德,韩立军,王思敬.红山窑风化红砂岩膨胀机制微细观分析[J].岩土力学,2009,30(Z2):192-195. |
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| 作者姓名： | 何山 朱珍德 韩立军 王思敬 |
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| 作者单位： | 1.盐城工学院，江苏 盐城 224000；2.中国矿业大学 岩土工程实验室，江苏 徐州 221116；3.河海大学 岩土工程研究所，南京 210098 |
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| 摘 要： | 通过扫描电镜，将红山窑风化红砂岩吸水前后的颗粒组成结构图放大300倍，从微细观方面揭示了红山窑全、强、中、弱不同风化程度的膨胀红砂岩吸水膨胀的全过程：吸水→水化→体积增加→产生膨胀力→膨胀力超过极限→崩解。从这一过程可以看出，膨胀岩的膨胀变形特性主要是由于膨胀岩中的部分矿物具有亲水性，遇水后发生水化反应而导致体积增 大，并引起膨胀应力；当膨胀力超过胶结物的粘结力时，就发生崩解；对于不同风化程度的膨胀岩，随着风化程度的加深，其吸水膨胀的过程越快，达到崩解的时间越短。
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| 关 键 词： | 膨胀岩 风化 微观结构 水化 膨胀力 |
| 收稿时间： | 2009-08-18 |
Micro and fine analysis of expansion mechanism of weathering red sandstone in Hongshanyao |
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| HE Shan,ZHU Zhen-de,HAN Li-jun,WANG Si-jing.Micro and fine analysis of expansion mechanism of weathering red sandstone in Hongshanyao[J].Rock and Soil Mechanics,2009,30(Z2):192-195. |
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| Authors: | HE Shan ZHU Zhen-de HAN Li-jun WANG Si-jing |
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| Institution: | 1.Yancheng Institute of Technology, Yancheng 224051, China; 2.China University of Mining & Technology, Xuzhou 221116, China; 3. Hohai University; Nanjing 210098, China |
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| Abstract: | The water swelling whole process of different weathering degrees swelling red sandstone with whole weathered, strong weathered, intermediary weathered and weak weathered was revealed in micro and fine by scanning electron microscope and digital image technique and amplifying the particle composition structure diagram before and after weathering 300 times. The water swelling whole process includes: water absorption→hydration→volume increased→producing expansive force→expansive force over limit→disintegration. It was viewed from this course that the hydrophilic of part mineral in swelling rock was the reason of swelling deformation characteristics. Encountering water, the hydration reaction of hydrophilic mineral led to volume enlarging and expansion stress. When the expansion stress was more than cement cohesive force, the disintegration would generate. The weathering degree was higher, and the process of water swelling was more quickly, and the time of reaching disintegration was shorter. |
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| Keywords: | swelling rock weathering microstructure hydration expansive force |
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