| 强降雨条件下高陡填方雪道路基稳定性分析 |
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| 引用本文： | 杨连祥,,翁效林,,胡继波,,雷尚民,.强降雨条件下高陡填方雪道路基稳定性分析[J].建筑科学与工程学报,2023,0(3):170-179. |
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| 作者姓名： | 杨连祥 翁效林 胡继波 雷尚民 |
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| 作者单位： | (1. 长安大学 公路学院,陕西 西安 710064; 2. 长安大学 特殊地区公路工程教育部重点实验室,陕西 西安 710064) |
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| 摘 要： | 为研究降雨入渗对路基稳定的影响规律,以涞源县冬奥会高陡滑雪赛道跳台路基为工程背景,考虑雪道路基填料的级配和降雨强度等因素,建立有限元模型,分析强降雨条件下高陡填方路基的稳定性,并通过离心试验结果验证数值模拟结果的合理性。结果表明:降雨入渗会导致路基位移增大,最大位移量为22.401 cm,孔压由负变正且相对孔压最大值为85 kPa; 随着路基填料级配趋于良好,路基顶面的位移和相对孔压逐渐减小; 随着降雨时间的增加,路基顶面的位移和相对孔压不断减小,位移由22.401 cm减少至12.35 cm,相对孔压由85 kPa减少至37 kPa,路基安全系数下降至1.2; 在降雨强度和时长相同的条件下,填土级配对路基稳定性的影响较大; 降雨强度存在临界值,一旦超过该临界值(150 mm?d-1),路基位移迅速增大,孔压急速变化,路基失稳时间缩短且破坏程度加剧; 降雨入渗引起的路基滑动破坏往往是浅层滑动,可通过加强路基坡面的防护和排水,减小降雨对路基浅层土体的影响,提高路基的稳定性。
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| 关 键 词： | 强降雨 路基填料 最优级配 高陡路基 失稳 |
Stability analysis of high and steep fill snowway roadbed under heavy rainfall condition |
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| YANG Lianxiang,,WENG Xiaolin,,HU Jibo,,LEI Shangmin,.Stability analysis of high and steep fill snowway roadbed under heavy rainfall condition[J].Journal of Architecture and Civil Engineering,2023,0(3):170-179. |
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| Authors: | YANG Lianxiang WENG Xiaolin HU Jibo LEI Shangmin |
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| Affiliation: | (1.School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China) |
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| Abstract: | In order to study the influence of rainfall infiltration on the stability of roadbed, the finite element model was established based on the engineering background of the high and steep ski jumping platform roadbed of Laiyuan County Winter Olympic Games, considering the factors such as gradation of snow roadbed filler and rainfall intensity. The stability of high and steep fill roadbed under heavy rainfall conditions was analyzed, and the rationality of numerical simulation results was verified by centrifugal test results. The results show that rainfall infiltration will lead to the increase of roadbed displacement, the maximum displacement is 22.401 cm, the pore pressure changes from negative to positive and the maximum relative pore pressure is 85 kPa. As the gradation of roadbed fill tends to be good, the displacement and relative pore pressure of the top surface of the roadbed gradually decrease. With the increase of rainfall time, the displacement and relative pore pressure of the top surface of the roadbed decrease continuously. The displacement decreases from 22.401 cm to 12.35 cm, the relative pore pressure decreases from 85 kPa to 37 kPa, and the safety factor of the roadbed decreases to 1.2. Under the same rainfall intensity and duration, the fill gradation has a great influence on the stability of roadbed. There is a critical value of rainfall intensity. Once the rainfall intensity exceeds the critical value(150 mm?d-1), the roadbed displacement increases rapidly, the pore pressure changes rapidly, the roadbed instability time is shortened, and the damage degree is aggravated. The sliding failure of roadbed caused by rainfall infiltration is often shallow sliding. By strengthening the protection and drainage of roadbed slope, the influence of rainfall on shallow soil of roadbed can be reduced and the stability of roadbed can be improved. |
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| Keywords: | heavy rainfall roadbed filling optimal gradation high and steep roadbed instability |
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