考虑基底起伏的土体失水开裂动态过程试验研究

金属矿山 ›› 2015, Vol. 44 ›› Issue (06): 154-157.

考虑基底起伏的土体失水开裂动态过程试验研究

龚绪龙¹，孙强^1,2，张卫强²，姚亚辉²

1.国土资源部地裂缝地质灾害重点实验室，江苏南京 210049；2.中国矿业大学资源与地球科学学院，江苏徐州 221116

出版日期:2015-06-15 发布日期:2015-08-05
基金资助:
* 国家自然科学基金项目（编号：41102201）。

Experimental Study on Dynamic Process of Soil Desiccation Cracking Based on Considering the Relief of Basement

Gong Xulong¹，Sun Qiang^1,2，Zhang Weiqiang²，Yao Yahui²

1.Key laboratory of Earth Fissures Geological Disaster,Ministry of Land and Resources,Nanjing 210049,China；2.School of Resources and Earth Science,China University of Mining and Technology,Xuzhou 221116,China

Online:2015-06-15 Published:2015-08-05

摘要/Abstract

摘要： 土体失水开裂会导致大量的工程和环境问题。利用失水收缩性强的膨润土，进行了土体失水开裂特征试验。研究表明土体失水开裂过程可划分为开裂前Ⅰ、快速开裂Ⅱ、开裂趋于停滞Ⅲ 3个阶段，裂缝发育演化中受到了模型边界和基底起伏的显著影响。在快速开裂阶段Ⅱ前期裂缝主要发育在模型的角部，后期裂缝主要在基底起伏影响范围内发育。在Ⅲ阶段，尽管表面开裂仍在发生，裂缝发育的整体格局已经不再发生显著变化。从裂缝形态看，后期裂缝与前期裂缝主要呈现为垂直相交，特别是在起伏区范围内。

关键词: 膨润土, 干燥开裂, 开裂率, 基底起伏

Abstract: The soil crack resulted by desiccation leads to many engineering and environmental problems.Taking bentonite with a high shrinkage rate for example,the soil desiccation and cracking tests are carried out.the results showed that the process of desiccation and crack were divided into three stages of pre-crackⅠ,rapid crackⅡ,and cracking stagnation Ⅲ.Cracking evolution is influenced by the boundary and relief of basement.At the early stage of rapid crackingⅡ,the cracking is mainly developing in the boundary of the model.However,in the late of crack,the cracking evolution is mainly influenced by relief of basement.In the stage Ⅲ,though the surface cracking still happens,the pattern of cracking development has not significantly being changed.The later cracks are approximately perpendicular to the early cracks,especially in the zone of basement from the view of the cracking shape.

Key words: Bentonite, Desiccation cracking, Cracks ratio, Relief of basement

龚绪龙, 孙强, 张卫强, 姚亚辉. 考虑基底起伏的土体失水开裂动态过程试验研究[J]. 金属矿山, 2015, 44(06): 154-157.

GONG Xu-Long, SUN Qiang, ZHANG Wei-Qiang, YAO Ya-Hui. Experimental Study on Dynamic Process of Soil Desiccation Cracking Based on Considering the Relief of Basement[J]. Metal Mine, 2015, 44(06): 154-157.

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