汶川地震后甘肃临夏北塬黄土场地大面积沉陷研究
|
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。
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.
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.
引文
[1]石兆吉,王兰民.土壤动力特性-液化势及危害性评价[M].北京:地震出版社,1999.
[2]罗宇生.湿陷性黄土地基处理[M].北京:中国建筑工业出版社,2008.
[3]Z X Yuan,L M Wang.Collapsibility and Seismic Settlementof Loess[J].Engineering Geology,2009,105(1):119-123.
[4]关文章.湿陷性黄土工程性能新篇[M].西安:西安交通大学出版社,1992.
[5]王峻,王强,王杰民.震后黄土动力学特性试验研究[J].水文地质工程地质,2010,37(4):63-67.
[6]康建成,李吉均.甘肃临夏黄土剖面:15万年环境演变的良好记录[J].地质论评,1993,39(2):165-175.
[7]孙建中.黄土学[M].香港:香港考古学会出版社,2005.
[8]GB50025-2004.湿陷性黄土地区建筑技术规范[S].北京:中国建筑工业出版社,2004.
[9]王兰民.黄土动力学[M].北京:地震出版社,2003.
[2]罗宇生.湿陷性黄土地基处理[M].北京:中国建筑工业出版社,2008.
[3]Z X Yuan,L M Wang.Collapsibility and Seismic Settlementof Loess[J].Engineering Geology,2009,105(1):119-123.
[4]关文章.湿陷性黄土工程性能新篇[M].西安:西安交通大学出版社,1992.
[5]王峻,王强,王杰民.震后黄土动力学特性试验研究[J].水文地质工程地质,2010,37(4):63-67.
[6]康建成,李吉均.甘肃临夏黄土剖面:15万年环境演变的良好记录[J].地质论评,1993,39(2):165-175.
[7]孙建中.黄土学[M].香港:香港考古学会出版社,2005.
[8]GB50025-2004.湿陷性黄土地区建筑技术规范[S].北京:中国建筑工业出版社,2004.
[9]王兰民.黄土动力学[M].北京:地震出版社,2003.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心