某一级公路半填半挖段路基稳定性仿真研究
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摘要
随着公路建设的发展,半填半挖路基工程越来越多,其稳定性研究越来越受到科研人员的关注。为了保障某一级公路半填半挖段路基施工安全,从路基稳定性影响因素入手,对路基稳定性的评价方法进行了介绍,并采用Plaxis有限元软件,就路基填筑高度对该边坡稳定性的影响进行了数值模拟研究。得到以下主要结论:随着填筑高度增加,增量位移从填土路基外逐渐向填土路基内转移,最终逐渐发展为一条光滑的圆弧,该圆弧即为路堤边坡失稳时的破裂面;当填筑高度小于12 m时,破裂面位于填挖交界面附近,之后随着填筑高度增加,破裂面上移至填土路堤内部;当填筑高度达20 m时,破裂面发展成为一条坡顶至坡底的狭长圆弧面。
With the development of highway construction,more and more semi-filled and semiexcavated subgrade projects have been built,and the research on its stability has attracted more and more attention from researchers. In order to protect the safety of the construction of a first grade highway,This paper starts with the influencing factors of roadbed stability, the evaluation method of roadbed stability is introduced,and,the influence of filling height on stability of roadbed slope is studied by Plaxis software. The main conclusions are as follows: With the increase of filling height,incremental displacement is transferred from outside to inside of the filling roadbed,and eventually develops into a smooth circular arc,which is the rupture surface of the embankment slope when it is unstable; When the filling height is less than 12 m, the fracture surface is located near the filling-excavation interface. Then,with the increase of filling height,the fracture surface moves to the interior of the filling embankment. When the height of filling reaches 20 m,the fracture surface develops into a circular arc surface.
With the development of highway construction,more and more semi-filled and semiexcavated subgrade projects have been built,and the research on its stability has attracted more and more attention from researchers. In order to protect the safety of the construction of a first grade highway,This paper starts with the influencing factors of roadbed stability, the evaluation method of roadbed stability is introduced,and,the influence of filling height on stability of roadbed slope is studied by Plaxis software. The main conclusions are as follows: With the increase of filling height,incremental displacement is transferred from outside to inside of the filling roadbed,and eventually develops into a smooth circular arc,which is the rupture surface of the embankment slope when it is unstable; When the filling height is less than 12 m, the fracture surface is located near the filling-excavation interface. Then,with the increase of filling height,the fracture surface moves to the interior of the filling embankment. When the height of filling reaches 20 m,the fracture surface develops into a circular arc surface.
引文
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[16]袁堃,汪双杰,牛富俊,等.多年冻土拓宽路基差异沉降特征分析[J].中国公路学报,2016,29(09):21-28.
[17]涂美珍,张正雄,任超.公路边坡稳定性分析与防护方法综述[J].西部交通科技,2015(07):1-6.
[18]吴文彪,郑俊杰,曹文昭.考虑含水率影响的压实黄土路堤稳定性研究[J].岩土力学,2015,36(S1):542-546.
[2]龙兵.水位变化对半填半挖陡坡路基渗流、稳定性及沉降的影响分析[J].城市道桥与防洪,2016(3):38-42.
[3]吴维义.公路半填半挖路基病害机理及处治技术研究[J].路基工程,2018(S1):177-180.
[4]牛志强,闫长斌.高填方路堤工后沉降理论预测模型研究[J].公路工程,2018,43(01):110-113.
[5]牛义昌.半填半挖加筋土路堤稳定性有限元分析[J].江西建材,2017(06):126-127.
[6]农建政.基于改进弹塑性理论的丘陵公路路基沉降差异性分析[J].西部交通科技,2017(11):17-21.
[7]谷柏森,王家强.桩板墙支挡结构半填半挖路基不均匀沉降影响因素及其控制标准[J].土工基础,2015,29(05):30-34.
[8]吴维义.公路半填半挖路基病害机理及处治技术研究[J].路基工程,2018(S1):177-180.
[9]庞应刚,姚裕春,李楚根,等.斜坡高路堤路基病害治理及分析[J].铁道工程学报,2015,32(6):25-28.
[10]贾亮,贺世开,朱彦鹏,等.高填方路堤工后沉降监测试验研究[J].公路交通科技,2017,34(3):15-19.
[11]吴福宝.厦沙高速高填方路堤工后沉降监测及数值分析[J].科学技术与工程,2018,18(19):267-271.
[12]李仁娟.公路路基施工技术及质量控制分析[J].江西建材,2016(04):205-206.
[13]Guney Y,Sari D,Cetin M,et al.Impact of cyclic wetting-drying on swelling behavior of lime-stabilized soil[J].Building&Environment,2007,42(2):681-688.
[14]洪宝宁,化君晖,刘鑫,等.高液限土路堤填筑的双指标控制方法研究[J].岩土力学,2016,37(S1):255-262.
[15]Saride S,Puppala A J,Chikyala S R.Swell-shrink and strength behaviors of lime and cement stabilized expansive organic clays[J].Applied Clay Science,2013,85:39-45.
[16]袁堃,汪双杰,牛富俊,等.多年冻土拓宽路基差异沉降特征分析[J].中国公路学报,2016,29(09):21-28.
[17]涂美珍,张正雄,任超.公路边坡稳定性分析与防护方法综述[J].西部交通科技,2015(07):1-6.
[18]吴文彪,郑俊杰,曹文昭.考虑含水率影响的压实黄土路堤稳定性研究[J].岩土力学,2015,36(S1):542-546.