| 汶川地震后甘肃临夏北塬黄土场地大面积沉陷研究 |
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| 引用本文： | 王谦,袁中夏,王兰民,侯景瑞,张国信.汶川地震后甘肃临夏北塬黄土场地大面积沉陷研究[J].西北地震学报,2012,34(2):180-185. |
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| 作者姓名： | 王谦 袁中夏 王兰民 侯景瑞 张国信 |
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| 作者单位： | 1. 中国地震局兰州地震研究所,甘肃兰州 730000;中国地震局黄土地震工程重点实验室,甘肃兰州 730000;甘肃省岩土防灾工程技术研究中心,甘肃兰州 730000
2. 中国地震局兰州地震研究所,甘肃兰州 730000;中国地震局黄土地震工程重点实验室,甘肃兰州 730000 |
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| 基金项目： | 甘肃省地震局地震科技发展基金，中国地震局地震预测研究所基本科研业务经费项目:国家自然科学基金，中国地震局兰州地震研究所论著 |
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| 摘 要： | 北塬是位于甘肃省临夏县东北部的黄土塬,塬上分布为典型的马兰黄土。2008年汶川地震以后该地区陆续发生了较大规模的黄土湿陷灾害,并造成相当的经济损失。通过对北塬湿陷性黄土的野外调查和室内试验,研究了黄土湿陷的原因和机理。结果表明,该地区黄土产生大面积沉陷的主要原因是汶川地震中产生的深大裂缝与底部黄土垂直节理贯通形成渗水通道,水在底部不透水层聚集,土体由下至上产生湿陷,从而导致地基沉降。结合经济可行性和当地实际,针对类似原因引起的黄土湿陷问题提出了防治措施。
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| 关 键 词： | 黄土 湿陷灾害 成灾机理 防治措施 甘肃临夏 |
Study on Large-scale Subsidence of Loess Site after Wenchuan Ms8.0 Earthquake in Beiyuan,Linxia County,Gansu Province |
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| WANG?Qian,YUAN?Zhong-xi,WANG?Lan-min,HOU?Jing-rui and ZHANG Guo-xin.Study on Large-scale Subsidence of Loess Site after Wenchuan Ms8.0 Earthquake in Beiyuan,Linxia County,Gansu Province[J].Northwestern Seismological Journal,2012,34(2):180-185. |
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| Authors: | WANG?Qian YUAN?Zhong-xi WANG?Lan-min HOU?Jing-rui and ZHANG Guo-xin |
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| Institution: | 1,2(1.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China; 2.Key Laboratory of Loess Earthquake Engineering,Gansu Earthquake Administration,CEA,Lanzhou 730000,China; 3.Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province,Lanzhou 730000,China) |
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| Abstract: | Beiyuan is a loess tableland in northeast of Linxia county,Gansu province,where the soil deposit is typical Malan loess(Q3).After 2008 Wenchuan MS8.0 earthquake,cases of serious subsidence of loess ground were found within several months and caused substantial loss in economic.In this paper,the causes and mechanism of these large-scale subsidence of loess are analyzed through field investigation and laboratory test.It is believed that water seepage through channels which formed by connection of surface cracks developed during Wenchuan earthquake with vertical fissures in loess is the main cause.In the water seepage,water accumulates on the impermeable layer at the bottom of loess layer,and the loess partially collapsed from the bottom to the surface.To prevent such hazard,some treatment methods considering the economic condition and local suitability are proposed. |
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| Keywords: | Loess Subsidence hazard Disaster mechanism Prevention and treatment measure Linxia county of Gansu province |
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