含水量对黄土震陷性定量影响研究
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摘要
含水量是影响黄土震陷性非常重要的参数。本文以洮河三级阶地上典型的Q3黄土为研究对象,对其震陷性特征进行了全面、系统的研究。通过在20 m深探井中依次取得4 m、8 m、12 m、16 m、20 m处黄土原状试样进行室内试验,得到以下结果:(1)天然黄土存在震陷性随深度增加而逐渐减弱的规律;(2)通过增湿、减湿获得5%,10%,15%和20%四种不同含水量黄土试样,同一深度黄土随着含水量增加其震陷性增长的规律明显;(3)通过实验数据分析得到了含水量对黄土震陷性定量影响规律,并根据其规律给出了不同动应力作用下的黄土震陷临界含水量。
Water content of loess is a very important parameter for seismic subsidence.The subsidence characters of the typical Q3 loess,located on third terrace of Tao River are systemically investigated.The samples taken at depth of 4 m,8 m,12 m,16 m,20 m in a 20 m depth pit are researched in laboratory.The results show some primary achievements:(1) the seismic subsidence capacity of natural loess gradually weakens with depth increasing;(2) there is a obvious law that the seismic subsidence capacity of loess increases with the growth of water content in same depth from experimenting 4 samples with 5%,10%,15% and 20% water content,which were acquired by humidification and dehumidification of the samples;(3)Through analyzing the experiment data,the quantitative law of water content influence on the seismic subsidence capacity of loess is found,and based on the law,the critical water contents of loess seismic subsidence are given under different dynamic stress.
Water content of loess is a very important parameter for seismic subsidence.The subsidence characters of the typical Q3 loess,located on third terrace of Tao River are systemically investigated.The samples taken at depth of 4 m,8 m,12 m,16 m,20 m in a 20 m depth pit are researched in laboratory.The results show some primary achievements:(1) the seismic subsidence capacity of natural loess gradually weakens with depth increasing;(2) there is a obvious law that the seismic subsidence capacity of loess increases with the growth of water content in same depth from experimenting 4 samples with 5%,10%,15% and 20% water content,which were acquired by humidification and dehumidification of the samples;(3)Through analyzing the experiment data,the quantitative law of water content influence on the seismic subsidence capacity of loess is found,and based on the law,the critical water contents of loess seismic subsidence are given under different dynamic stress.
引文
[1]王兰民,主编.黄土动力学[M].北京:地震出版社,2003:198,208.
[2]张振中,段汝文.黄土震陷研究与预测[J].西北地震学报,1987,9(增刊):14-18.
[3]张振中.黄土地震灾害预测[M].北京:地震出版社,1999:68-70.
[4]王兰民,张振中.地震时黄土震陷量的估算方法[J].自然灾害学报,1993,2(3):85-94.
[5]余雄飞,谢定义.原状黄土的增湿结构弱化特性对动荷载下变形特性的影响[A]∥全国土工建筑物及地基抗震学术讨论会论文汇编[C].北京:中国水利学会岩土力学专业委员会,1986:225-228.
[6]何光,朱鸿博.黄土震陷研究[J].岩土工程学报,1990,12(6):99-103.
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[8]王兰民,袁中夏,石玉成,等.黄土地震灾害区划指标与方法研究[J].自然灾害学报,1999,8(3):87-92.
[9]徐舜华,王兰民,袁中夏.黄土震陷初判指标的界定研究[J].西北地震学报,2006,28(2):140-143.
[10]张冬丽,王兰民,王玉华.有限元方法在黄土地基震陷预测中的应用[J].西北地震学报,2002,24(3):207-214.
[11]徐舜华,秋仁东,王平.黄土震陷下限深度研究[J].西北地震学报,2007,29(3):240-244.
[12]陈希哲.土力学地基基础(第三版)[M].北京:清华大学出版社,2003.
[13]谢定义.试论我国黄土力学研究中的若干新趋向[J].岩土工程学报,2001,23(1):3-13.
[14]孙崇绍.西北黄土地区河谷城市地震动参数小区划研究——以兰州为例[J].西北地震学报,2007,29(1):3-11.
[15]廖胜修,程菊红.黄土场地震动液化实例[J].西北地震学报,2007,29(1):54-57.
[2]张振中,段汝文.黄土震陷研究与预测[J].西北地震学报,1987,9(增刊):14-18.
[3]张振中.黄土地震灾害预测[M].北京:地震出版社,1999:68-70.
[4]王兰民,张振中.地震时黄土震陷量的估算方法[J].自然灾害学报,1993,2(3):85-94.
[5]余雄飞,谢定义.原状黄土的增湿结构弱化特性对动荷载下变形特性的影响[A]∥全国土工建筑物及地基抗震学术讨论会论文汇编[C].北京:中国水利学会岩土力学专业委员会,1986:225-228.
[6]何光,朱鸿博.黄土震陷研究[J].岩土工程学报,1990,12(6):99-103.
[7]湿陷性黄土地区建筑规范(GB50025-2004)[S].北京:中国建筑工业出版社,2004.
[8]王兰民,袁中夏,石玉成,等.黄土地震灾害区划指标与方法研究[J].自然灾害学报,1999,8(3):87-92.
[9]徐舜华,王兰民,袁中夏.黄土震陷初判指标的界定研究[J].西北地震学报,2006,28(2):140-143.
[10]张冬丽,王兰民,王玉华.有限元方法在黄土地基震陷预测中的应用[J].西北地震学报,2002,24(3):207-214.
[11]徐舜华,秋仁东,王平.黄土震陷下限深度研究[J].西北地震学报,2007,29(3):240-244.
[12]陈希哲.土力学地基基础(第三版)[M].北京:清华大学出版社,2003.
[13]谢定义.试论我国黄土力学研究中的若干新趋向[J].岩土工程学报,2001,23(1):3-13.
[14]孙崇绍.西北黄土地区河谷城市地震动参数小区划研究——以兰州为例[J].西北地震学报,2007,29(1):3-11.
[15]廖胜修,程菊红.黄土场地震动液化实例[J].西北地震学报,2007,29(1):54-57.
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