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中文摘要：
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。
英文摘要：
Beiyuan is a loess tableland in northeast of Linxia county, Gansu province, where the soil deposit is typical Malan loess（Q3 ）. After 2008 Weuehuan Ms8.0 earthquake, cases of serious subsidence of loess ground were found within several mouths 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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