| 振动荷载作用下冻土结构弱化机理研究 |
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| 引用本文： | 徐春华,徐学燕,耿永常,蒲毅彬. 振动荷载作用下冻土结构弱化机理研究[J]. 哈尔滨工业大学学报, 2003, 35(12): 1429-1431,1513 |
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| 作者姓名： | 徐春华 徐学燕 耿永常 蒲毅彬 |
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| 作者单位： | 1. 哈尔滨工业大学,土木工程学院,黑龙江,哈尔滨,150090
2. 中国科学院,兰州寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金资助项目(40071021)，中国科学院冻土工程国家重点实验室基金资助项目. |
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| 摘 要： | 基于低温动三轴试验及CT扫描试验对不同围压、负温下冻结粉质黏土的弱化机理进行了分析研究，利用冻结粉质黏土动三轴试验前、后的CT扫描试验数据与图像，定量分析了冻土的密度、结构及损伤度等方面的变化及动三轴试验前、后CT数增量．方差增量与围压、负温之间的关系．分析了在振动荷载作用下冻土内部孔隙、裂隙扩展过程，从附加损伤的角度证实了临界围压值的存在，明确了冻结粉质黏土结构弱化的根本原因是孔隙冰的压融和微裂隙的发育．
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| 关 键 词： | 振动荷载 冻结粉质黏土 弱化机理 低温动三轴试验 CT扫描试验 地震 |
| 文章编号： | 0367-6234(2003)12-1429-03 |
Structural degrade analysis of frozen soil under vibrating load |
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| XU Chun-hua,XU Xue-yan,GENG Yong-chang,PU Yi-bin. Structural degrade analysis of frozen soil under vibrating load[J]. Journal of Harbin Institute of Technology, 2003, 35(12): 1429-1431,1513 |
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| Authors: | XU Chun-hua XU Xue-yan GENG Yong-chang PU Yi-bin |
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| Abstract: | The structural degradation mechanism on frozen silt clay was studied using the experimental data obtained through dynamic triaxial stress - strain test and CT scanning test of frozen soil under different confining pressure and temperature. The characteristics of density, structure, damage degree of frozen soil, and the relation between the increment of CT number, mean square deviation and confining pressure, temperature are discussed in detail using the CT scanning results of frozen silt clay obtained before and after the dynamic triaxial test. There exists a critical confining pressure from the point of density damage increment. It has been definite that pore ice melting under pressure and the growth of micro-cracks are the fundamental canses for the structural degrade of frozen silt clay. |
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| Keywords: | frozen soils computerized tomography soil structure vibrating load |
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