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| 新疆伊犁黄土的物性指标、动力学特性与滑坡 | |
| 引用本文： | 尹光华,王兰民,袁中夏,李志强,刘红玫,王平,吴国栋.新疆伊犁黄土的物性指标、动力学特性与滑坡[J].干旱区地理,2009,32(6). |
| 作者姓名： | 尹光华 王兰民 袁中夏 李志强 刘红玫 王平 吴国栋 |
| 作者单位： | 1. 新疆地震局,新疆乌鲁木齐,830011 2. 甘肃省地震局,甘肃兰州,730000;中国地震局地震预测研究所兰州科技创新基地,甘肃兰州,730000 3. 新疆地质环境监测院,新疆乌鲁木齐,830000 4. 甘肃省地震局,甘肃兰州,730000 |
| 基金项目： | 国家自然科学基金项目(40562001)和(40864003) |
| 摘 要： | 分析了伊犁谷地28个黄土样品的粒径、密度、含水量和孔隙比,测试了震陷、湿陷、动弹模量和塑性指数,探讨了伊犁谷地黄土的物性、动力学特征,讨论了它们与滑坡之间的关系。伊犁谷地的原生黄土主要以粉粒为主,含量为74%,大于75μm的颗粒含量为10%,小于5μm的颗粒含量为15%;黄土天然含水量为4%~16.1%,谷地东部的黄土明显地比谷地西部的更细,伊犁黄土的孔隙比在0.832~0.907之间,有相当的湿陷性。在含水量低于20%时,还会有湿陷。黄土的塑性指数为9左右,比较小,粘粒含量低,易损性大,抗震性能差,具有较强的震陷性。在同样的动应变下,伊犁黄土的动模量较小,随着动应变的增大,其动模量衰减较快。冻融季节是伊犁地区滑坡的多发季节,构造活动强烈的地段也是地质灾害的多发地段。 |
| 关 键 词： | 伊犁黄土 物性 震陷特征 滑坡 地质灾害 |
Physical index,dynamic property and landslide of Ili loess |
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| YIN Guang-hua,WANG Lan-min,YUAN Zhong-xia,LI Zhi-qiang,LIU Hong-mei,WANG Ping,WU Guo-dong.Physical index,dynamic property and landslide of Ili loess[J].Arid Land Geography,2009,32(6). | |
| Authors: | YIN Guang-hua WANG Lan-min YUAN Zhong-xia LI Zhi-qiang LIU Hong-mei WANG Ping WU Guo-dong |
| Institution: | YIN Guang-hua1,WANG Lan-min2,3,YUAN Zhong-xia2,LI Zhi-qiang4,LIU Hong-mei2,WANG Ping2,WU Guo-dong1(1 Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China,2 Earthquake Administration of Gansu Province,Lanzhou 730000,Gansu,3 Lanzhou Science and Technology Innovative Base of Institute of Earthquake Prediction,C.E.A,4 The Geological Environmental Monitoring of Xinjiang,Urumqi 830068,China) |
| Abstract: | We analyzed the particle size, density, water content and void ratio of 28 loess samples in the Hi valley and tested the seismic subsidence, collapsibility, dynamic modulus and plasticity index. The physical property and dynamic characteristic of loess in the Ili Valley were discussed. The relationship between the loess characteristic and the landslide was talked over. The primary loess of Ili valley was formed in late Pleistocene and is mainly com-posed of silt particle, including 74 percent. The particle of 75 -5 μm is 10 percent and that less than 5 μm is 15 percent; the natural water content of loess is 4 -16. 1 percent. The loess of the east valley is obviously finer than that of the west valley. It indicates that the loess was rooted in the west hungriness and related to the conveying function of the westerly wind. The void ratio of Hi loess is 0. 832 -0. 907, going with considerable collapsibility. Although the water content is less than 20 percent, the collapse may happen. The plastic index of the loess is about 9, comparatively small. The clay content is low and the vulnerability is high. The seismic performance is bad and the seismic subsidence is comparatively strong. Under the same dynamic strain condition, the dynamic modulus of Ili loess is smaller. With the accretion of dynamic strain, the attenuation of dynamic modulus is quick. The land-slide often happens in the spring melting season, caused by freezing-thawing function in winter. The geological dis-aster also happens in the distinctly active structure. It is great valuable for reference to recognize the characteristic of Ili loess and prevent the loess landslide. r |
| Keywords: | Ili loess physical property seismic settlement characteristic landslides geohazards |
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