| 基底潜山对土体失水收缩开裂动态过程影响的试验研究 |
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| 引用本文： | 龚绪龙,孙强,张卫强,薛雷. 基底潜山对土体失水收缩开裂动态过程影响的试验研究[J]. 地震工程学报, 2015, 37(1): 11-15 |
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| 作者姓名： | 龚绪龙 孙强 张卫强 薛雷 |
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| 作者单位： | 国土资源部地裂缝地质灾害重点实验室(江苏省地质调查研究院), 江苏 南京 210049;国土资源部地裂缝地质灾害重点实验室(江苏省地质调查研究院), 江苏 南京 210049;中国矿业大学资源与地球科学学院, 江苏 徐州 221116;中国矿业大学资源与地球科学学院, 江苏 徐州 221116;中国科学院工程地质力学重点实验室 中国科学院地质与地球物理研究所, 北京 100029 |
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| 基金项目： | 国土资源部地裂缝地质灾害重点实验室开放课题;国家自然科学基金项目(No:41102201, 41302233) |
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| 摘 要： | 利用失水收缩性强的黏土,进行含有基底潜山和无潜山两种情况下土体失水开裂特征试验。研究表明:(1)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三个阶段;(2)含有潜山的试验中裂缝发育演化时受到了基底起伏的显著影响;(3)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。饱和黏土表面开裂主要是由水分丧失引起的土体基质吸力和表面收缩率的变化产生的,边界条件和基底起伏对开裂有着显著控制作用。
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| 关 键 词： | 地质环境 土体裂缝 地质灾害 潜山 |
| 收稿时间： | 2014-08-20 |
The Influence of a Buried Hill in Basement on the DynamicProcess of Cracking Due to Soil Desiccation |
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| GONG Xu-long,SUN Qiang,ZHANG Wei-qiang and XUE Lei. The Influence of a Buried Hill in Basement on the DynamicProcess of Cracking Due to Soil Desiccation[J]. China Earthguake Engineering Journal, 2015, 37(1): 11-15 |
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| Authors: | GONG Xu-long SUN Qiang ZHANG Wei-qiang XUE Lei |
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| Affiliation: | Key laboratory for Earth Fissures Geological Disaster, Ministry of Land and Resources, Nanjing, Jiangsu 210049, China;Key laboratory for Earth Fissures Geological Disaster, Ministry of Land and Resources, Nanjing, Jiangsu 210049, China;School of Resources and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;School of Resources and Earth Science, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;Key Laboratory of Engineering Geomechanics, Institute of Geology and Geophysics, Chinese Academyof Sciences, Beijing 100029, China |
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| Abstract: | The cracking of soil has resulted in significant geological engineering and environmental problems.Indoor experiments on water loss ratio and the desiccation cracking of clay were carried out at room temperature.The research results indicate that:(1) the cracking progress can be divided into pre-cracking, rapid cracking, and cracking stagnation stages, (2) the cracking process is influenced by the buried hill of basement, and (3) though the surface cracking persists, the pattern of cracking has not significantly changed.The later cracks were approximately perpendicular to the early cracks, especially in the basement zone.The change in metric suction and surface shrinkage through water loss leads to the desiccation and cracking of the clay and the cracking process is controlled primarily by the boundary and geomorphologic form of the basement. |
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| Keywords: | geological environment soil crack geological hazard buried hill |
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