| 场地黄土扰动前后的湿陷性与其物性指标的关系 |
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| 引用本文： | 史宝东,梁庆国,赵涛,王文卓.场地黄土扰动前后的湿陷性与其物性指标的关系[J].西北地震学报,2021,43(4):977-982,988. |
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| 作者姓名： | 史宝东 梁庆国 赵涛 王文卓 |
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| 作者单位： | 1.兰州交通大学土木工程学院，甘肃 兰州 730070;2.甘肃省道路桥梁与地下工程重点实验室，甘肃 兰州 730070;3.土木工程国家级实验教学示范中心(兰州交通大学), 甘肃 兰州 730070 |
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| 基金项目： | 国家自然科学基金（41562013，51968041）；兰州交通大学“百名青年优秀人才培养计划” |
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| 摘 要： | 黄土物性指标可以近似但较为简便快速地评价其湿陷性。原状黄土在不同荷载和浸水的扰动下,随着其物性指标的改变,湿陷性也随之变化,故为了更好地评价这类扰动性黄土的湿陷性,在兰州东岗某场地上进行的两次相隔四十多年室内试验的基础上,采用相关分析的方法,研究扰动前后湿陷性系数与干密度、含水率、孔隙比、饱和度和塑性指数之间的关系。结果表明:(1)扰动前后湿陷性系数和干密度、含水率、饱和度和塑性均呈负相关,和孔隙比呈正相关,且扰动后湿陷性系数整体上低于扰动前,各指标对湿陷性系数的影响减弱。(2)以干密度、含水率、孔隙比、饱和度和塑性指数作为反映扰动前后黄土湿陷性的因子进行多元线性回归和因子权重分析,得出用以评价扰动前后黄土湿陷性的回归公式和影响湿陷性的因子排序。研究结果对于研判扰动黄土的湿陷性并选择合适的地基处理方法具有一定参考价值。
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| 关 键 词： | 扰动黄土 湿陷性 相关性 物性指标 |
| 收稿时间： | 2020/4/6 0:00:00 |
Relationship between collapsibility and physical properties of loess before and after disturbance |
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| SHI Baodong,LIANG Qingguo,ZHAO Tao,WANG Wenzhuo.Relationship between collapsibility and physical properties of loess before and after disturbance[J].Northwestern Seismological Journal,2021,43(4):977-982,988. |
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| Authors: | SHI Baodong LIANG Qingguo ZHAO Tao WANG Wenzhuo |
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| Institution: | 1.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China;2.Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou 730070, Gansu, China;3.National Demonstration Center for Experimental Civil Engineering Education (Lanzhou Jiaotong University), Lanzhou 730070, Gansu, China |
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| Abstract: | The physical properties of loess can be used to simply and quickly evaluate its collapsibility. Under the disturbance of different loads and water infiltration, the collapsibility of intact loess varies with the change in its physical properties. To better evaluate the collapsibility of such disturbed loess, on the basis of two indoor tests conducted on a site in Donggang Town, Lanzhou City with a time span of more than 40 years, the correlation analysis method was used to study the relationships among the collapsibility coefficient and the dry density, water content, porosity, saturation, and plasticity index of loess before and after the disturbance. The results show that: (1) Before and after the disturbance, the collapsibility coefficient is negatively correlated with the dry density, water content, saturation and plasticity, and positively correlated with the porosity ratio. After the disturbance, the collapsibility coefficient is generally lower than that before the disturbance, and the influence of the indices on the collapsibility coefficient is weakened. (2) Using the dry density, water content, porosity ratio, saturation and plasticity index as factors reflecting the collapsibility of loess before and after the disturbance, the multivariate linear regression and factor weight analysis were performed to obtain the regression equation and the sequence of factors affecting the loess collapsibility. The research results have certain reference value for estimating the collapsibility of disturbed loess and choosing an appropriate foundation treatment method. |
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| Keywords: | disturbed loess collapsibility correlation physical indices |
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