山区防洪透水路基结构在强降雨作用下的稳定性分析
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摘要
山区公路陡坡填方路基因其整体稳定性和透水性较差而成为特大降雨造成公路水毁的重灾对象之一。在北京"7.21"公路水毁的恢复工程中,以加筋桩板石笼挡墙形成的山区新型防洪透水路基结构被提出和应用。利用ABAQUS软件对该路基结构进行模拟,以流固耦合算法对其在不同强度降雨条件下的变形和孔压进行了分析,并利用强度折减法对其稳定性做出分析和评价。结果表明,板桩加筋石笼组合挡墙在强降雨前后都有较好的稳定性,是山区公路防洪透水路基的首选支挡结构之一。
The steep embankment subgrade of mountain highway becomes one of the severely affected objects, which is damaged by heavy rainfall, because of its poor overall stability and permeability. The new-style flood-prevention permeable subgrade structure formed by reinforced pile-plate gabion retainingwall is put forward and applied in the restoration project of Beijing 7.21 Highway Damaged by floods. Thesubgrade structure is simulated by ABAQUS software, then its deformation and pore pressure under different strength of rainfall are analyzed by fluid-solid coupling algorithm, and its stability is analyzed andevaluated by strength reduction method. The results show that the permeable pile-plate gabion retainingwall structure has preferable stability whether before or after the rainfall. Therefore, the reinforced pile-plate gabion retaining wall is one of the preferred flood-prevention permeable retaining structures ofmountain highway.
The steep embankment subgrade of mountain highway becomes one of the severely affected objects, which is damaged by heavy rainfall, because of its poor overall stability and permeability. The new-style flood-prevention permeable subgrade structure formed by reinforced pile-plate gabion retainingwall is put forward and applied in the restoration project of Beijing 7.21 Highway Damaged by floods. Thesubgrade structure is simulated by ABAQUS software, then its deformation and pore pressure under different strength of rainfall are analyzed by fluid-solid coupling algorithm, and its stability is analyzed andevaluated by strength reduction method. The results show that the permeable pile-plate gabion retainingwall structure has preferable stability whether before or after the rainfall. Therefore, the reinforced pile-plate gabion retaining wall is one of the preferred flood-prevention permeable retaining structures ofmountain highway.
引文
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[2]张阳阳,李宗坤,李艳.基于ABAQUS的强度折减法边坡失稳判据研究[J].浙江水利水电专科学校学报,2009(1):13-15.
[3]田仕明.高边坡在降雨条件下的稳定性分析[D].昆明:昆明理工大学,2011.
[4]汪仕旭.降雨入渗对土坡稳定性的影响[D].广州:广东工业大学,2011.
[5]费康,张建伟.ABQUS在岩土中的应用[M].北京:中国水利水电出版社,2010.
[6]蒋洋,徐慧,柴贺军,等.石笼单体结构应力-应变特征试验研究[J].公路交通科技,2008(2):94-97.
[7]王金昌,陈页开.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2006:98-101
[8]科迪.降雨强度标准划分[J].北京水利,1995(4):49.
[9]吴庆云,王晓东.降水入渗条件下土质边坡的稳定性分析[J].中国水运,2012,12(7):217-219.
[10]高润德,彭良泉,王钊.雨水入渗作用下非饱和土边坡的稳定性分析[J].人民长江,2001,32(11):25-27.
[11]水利水电科学研究院,等.岩土力学参数手册[M].北京:水利电力出版社,1990.
[12]程曦.基于ABAQUS的内河航道岸坡稳定性数值模拟研究[D].天津:天津大学,2011.
[13]王晓东,吴连海.强度折减有限元法在降雨条件下土质边坡稳定性分析中的应用[J].铁道勘察,2012(6):47-50.
[14]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报,2002,24(3):343-346.