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1.兰州交通大学土木工程学院,甘肃 兰州 730000
2.中铁西北科学研究院有限公司,甘肃 兰州 730000
3.中国中铁滑坡工程实验室,甘肃 兰州 730000
4.西部环境岩土及场地修复技术工程实验室,甘肃 兰州 730000
Received:29 December 2020,
Revised:2021-04-23,
Published:28 August 2022
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马坤,张永谋,吴红刚等.基于多传感器数据融合分析的路堑滑坡模型试验研究[J].防灾减灾工程学报,2022,42(04):653-663.
MA Kun,ZHANG Yongmou,WU Honggang,et al.Research on Model Test of Cutting Landslide based on Multi‑sensor Data Fusion Analysis[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):653-663.
马坤,张永谋,吴红刚等.基于多传感器数据融合分析的路堑滑坡模型试验研究[J].防灾减灾工程学报,2022,42(04):653-663. DOI: 10.13409/j.cnki.jdpme.20201229002.
MA Kun,ZHANG Yongmou,WU Honggang,et al.Research on Model Test of Cutting Landslide based on Multi‑sensor Data Fusion Analysis[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):653-663. DOI: 10.13409/j.cnki.jdpme.20201229002.
以成都天府国际机场高速公路TJ04标段K17+700~K17+900段滑坡为典型代表,通过地质分析及室内模型试验相结合的方法,运用数据融合及统计学概率运算方法,对降雨作用下路堑边坡的变形破坏过程进行研究。 结果表明:(1)通过地质分析认为K17+700~K17+900段滑坡形成主要原因是地表水入渗及滑坡前缘路基开挖 ;(2)通过模型试验研究已开挖路基在降雨条件下的变形特征,得出其变形机理为:降雨入渗→边坡局部溜坍→地表水入渗加剧→土体含水率上升→孔隙水压力增大→边坡失稳→整体牵引式滑移;(3)通过传感器数据融合及统计学概率分析得出,随着降雨历时增长,含水率的变化曲线与累计降雨量之间呈正相关,相关系数为0.600 15具有显著相关性,孔隙水压力的变化曲线与含水率之间正相关,相关系数为0.921 74具有高度相关性,说明雨水入渗是土体含水率与孔隙水压力增长的直接原因。
Taking the landslide in section K17+700~K17+900 of Chengdu Tianfu International Airport Expressway TJ04 as a typical representative, combining geological analysis and indoor model test, and using data fusion and statistical probability calculation methods, the deformation and failure process of a road cut slope under the action of rainfall was studied. The results show that: (1)Through geological analysis, it is believed that the main reasons for the formation of the landslide in section K17+700~K17+900 are surface water infiltration and excavation of roadbed at the landslide outlet; (2)The deformation characteristics of the excavated roadbed under rainfall conditions are studied through model tests. It is concluded that the deformation mechanism is as follows: rainfall infiltration → partial slump of the slope → intensified surface water infiltration → increase of soil moisture content → increase of pore water pressure → slope instability → overall retrogressive sliding; (3)Data fusion and statistical probability analyses show that, as the rainfall duration increases, there is a positive correlation between the change curve of water cut and the accumulated rainfall. The correlation coefficient is 0.600 15, showing a significant correlation. The change curve of pore water pressure has a positive correlation with the water cut. A correlation coefficient of 0.921 74 shows a high correlation, indicating that the rainfall infiltration is the direct cause of the increase in soil moisture content and pore water pressure.
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