基于变形控制的高填方路基后处理技术参数研究
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摘要
随着我国基本建设的发展,高填方路基在公路建设中得到越来越多的应用。软土地区的路基由于其渗透系数小,逐层填方过程中缺乏良好的排水通道,在填方路基荷载作用下,随着填方高度的增加会产生呈线性增加的超孔隙水压力,土体的有效应力难以得到有效增加,影响路基的稳定,拖延施工进度。高填方路基后处理技术有效解决了这个技术难题。
高填方路基的沉降变形为工程界普遍关注的问题。本文在前人研究的基础上针对无砂砼小桩后处理高填方路基的沉降变形随着设计参数的变化发展规律展开研究。通过数值模拟方法,建立无砂砼小桩后处理模型,建立桩长、桩径、桩间距、后处理填方平台高度变化时的有限元模型,进行系统的数值分析,得到下列结论：
(1)无砂砼小桩后处理技术在成孔形成桩体过程中,由于桩体的良好排水通道作用,可以加速排水固结,加速固结沉降,总沉降小；后期填方荷载由后处理复合地基所承担,工后沉降小；
(2)桩径、桩间距、后处理填方平台高度不变时,加大桩长可以加速固结沉降,工后沉降随着桩长的增加而减小,总沉降量减小；
(3)桩长、桩间距、后处理填方平台高度不变时,增大桩径可以加速固结沉降,减小工后沉降,总沉降量减小;
(4)桩长、桩径、后处理填方平台高度不变时,减小桩间距可以加速固结沉降,减小工后沉降,总沉降量减小；
(5)桩长、桩径、桩间距不变,增加后处理填方平台高度可以减小沉降量,减小工后沉降。
With the development of infrastructure, high-fill embankment in highway construction has been more and more used. Because t the permeability of the soft soils is very small, and there is no good drainage channels in the fill loads, excess pore water pressure will increase linearly with the process of filling increases, threatening the stability of the roadbed and affecting construction progress. The post-processing technique effectively solves the problem. At present, post-processing techniques used is non-sand concrete micro-pile technology.
The settlement of high embankment is the general concern of the society of the engineering. Based on previous studies, this article researches the settlement of high fill embankment which uses non-sand concrete micro-pile technology and the influence of the parameters change with the law of development. By numerical simulation, the establishment of a small pile of sand concrete post-processing model, a pile length, pile diameter, pile spacing, post-treatment fill platform height fill the finite element model, concluded that:
(1) Non-sand concrete micro-pile technology, due to the good drainage of the pile, can speed up the drainage and consolidation, can decrease the total settlement; post-filling load is controlled by the composite foundation;
(2) When the pile diameter, pile spacing and the post-processing platform are a fixed value, the greater length of the pile can speed up the consolidation settlement, can decrease the settlement of post-fill amount and can reduce the total settlement amount;
(3) When the pile spacing, pile length and the post-processing platform are a fixed value, the greater diameter of the pile can speed up the consolidation settlement, can decrease the settlement of post-fill amount and can reduce the total settlement amount;
(4) When the pile diameter, pile length and the post-processing platform are a fixed value, the smaller spacing of the pile can speed up the consolidation settlement, can decrease the settlement of post-fill amount and can reduce the total settlement amount;
(5) When the pile diameter, pile length and pile spacing are a fixed value, the increased post-processing platform can reduce the total settlement and the settlement of post-fill amount.
高填方路基的沉降变形为工程界普遍关注的问题。本文在前人研究的基础上针对无砂砼小桩后处理高填方路基的沉降变形随着设计参数的变化发展规律展开研究。通过数值模拟方法,建立无砂砼小桩后处理模型,建立桩长、桩径、桩间距、后处理填方平台高度变化时的有限元模型,进行系统的数值分析,得到下列结论：
(1)无砂砼小桩后处理技术在成孔形成桩体过程中,由于桩体的良好排水通道作用,可以加速排水固结,加速固结沉降,总沉降小；后期填方荷载由后处理复合地基所承担,工后沉降小；
(2)桩径、桩间距、后处理填方平台高度不变时,加大桩长可以加速固结沉降,工后沉降随着桩长的增加而减小,总沉降量减小；
(3)桩长、桩间距、后处理填方平台高度不变时,增大桩径可以加速固结沉降,减小工后沉降,总沉降量减小;
(4)桩长、桩径、后处理填方平台高度不变时,减小桩间距可以加速固结沉降,减小工后沉降,总沉降量减小；
(5)桩长、桩径、桩间距不变,增加后处理填方平台高度可以减小沉降量,减小工后沉降。
With the development of infrastructure, high-fill embankment in highway construction has been more and more used. Because t the permeability of the soft soils is very small, and there is no good drainage channels in the fill loads, excess pore water pressure will increase linearly with the process of filling increases, threatening the stability of the roadbed and affecting construction progress. The post-processing technique effectively solves the problem. At present, post-processing techniques used is non-sand concrete micro-pile technology.
The settlement of high embankment is the general concern of the society of the engineering. Based on previous studies, this article researches the settlement of high fill embankment which uses non-sand concrete micro-pile technology and the influence of the parameters change with the law of development. By numerical simulation, the establishment of a small pile of sand concrete post-processing model, a pile length, pile diameter, pile spacing, post-treatment fill platform height fill the finite element model, concluded that:
(1) Non-sand concrete micro-pile technology, due to the good drainage of the pile, can speed up the drainage and consolidation, can decrease the total settlement; post-filling load is controlled by the composite foundation;
(2) When the pile diameter, pile spacing and the post-processing platform are a fixed value, the greater length of the pile can speed up the consolidation settlement, can decrease the settlement of post-fill amount and can reduce the total settlement amount;
(3) When the pile spacing, pile length and the post-processing platform are a fixed value, the greater diameter of the pile can speed up the consolidation settlement, can decrease the settlement of post-fill amount and can reduce the total settlement amount;
(4) When the pile diameter, pile length and the post-processing platform are a fixed value, the smaller spacing of the pile can speed up the consolidation settlement, can decrease the settlement of post-fill amount and can reduce the total settlement amount;
(5) When the pile diameter, pile length and pile spacing are a fixed value, the increased post-processing platform can reduce the total settlement and the settlement of post-fill amount.
引文
[1]郑俊杰.复合地基承载特性分析及设计方法研究[D].[博士学位论文].杭州：浙江大学,1991
[2]冯伟凯,眭爱宏,陈振国.高填方车站大面积软土地基整治技术[J].路基工程,铁道标准设计,2003(增刊)：184-186
[3]刘景政,杨素春,钟冬波.地基处理与实例分析[M].北京：中国建筑工业出版社,1998
[4]田利平.谈石灰桩加固软土地基[J].山西建筑,2004(1)：14-15
[5]李明杰,李鹏,靳明.高填方路堤复合地基处治研究[J].中外公路,2005,25(3)：21-23
[6]张杨.刚性桩复合地基作用机理及沉降分析[D].[硕士学位论文].合肥：合肥工业大学,2010
[7]马凡.CFG桩复合地基降低高填方路基沉降的计算及应用[J].公路,2006,2(2)：84-87
[8]王斌,徐泽中.预应力管桩在高速公路拼接工程软基处理中的设计方法[J].公路,2004,2：84-88
[9]赵明华.土力学与地基基础[M].武汉：武汉理工大学出版社,2003
[10]李道生.高填方地段强夯处理湿陷性黄土夯击参数的选择[J].路基工程,2005(1)：25-28
[11]管殿聆,阎万里.冲击式压路机在湿陷性黄土高填方重载路基上的应用[J].铁道标准设计,2001,21(11)：24-25
[12]陈希哲.土力学地基基础[M].北京：清华大学出版社,2003
[13]林道义.高压旋喷注浆法加固软弱地基简介[J].工程勘察,1985(4)：30-34
[14]胡明清,周志超.高压旋喷注浆法处理软弱地基在工程中的应用[J].化工设计通讯,1999(9)：59-62
[15]楚斌.软土路基排水固结机理研究及应用[D].武汉：中国科学院武汉岩土力学研究所,2003
[16]戴以宪,刑积华.浅谈软土路基排水固结法施工的质量控制[J].科技信息,2006(7)：68-69
[17]V. Tandjiria, B. K. Lowb. C. I. Teh. The Effect of reinforcement force distribution on stability of embankments [J]. Geotextiles and Geomembranes,2002(20):423-443
[18]Dennes. T. Bergadoa, Pham V. Longb, B. R. Srinivasa Murthy. A case study of geotextile-reinforced embankment on soft ground[J]. Geotextiles and Geomembranes,2002, 20:343-365
[19]Jose Leitao Borges, Antonio Silva Cardoso. Overall stability of geosynthetic-reinforced embankments on soft soils[J]. Geotextiles and Geomembranes,2002,20:395-421
[20]Sean D. Hinchberger, R. Kerry Rowe. Geosynthetic reinforced embankments on soft clay foundations:predicting reinforcement strains at failure[J]. Geotextiles and Geomembranes 2003,21,151-175
[21]B. S. Bakir, E. Akis. Analysis of a highway embankment failure associated with the 1999 Duzce, Turkey earthquake[J]. Soil Dynamics and Earthquake Engineering,2005,25, 251-260
[22]A. K. Sinha, Vasant G. Havanagi, Sudhir Mathur. Inflection point method for predicting settlement of PVD improved soft clay under embankments[J]. Geotextiles and Geomembranes,2007,25:336-345
[23]Allen Lunzhu Li, R. Kerry Rowe. Effects of viscous behavior of geosynthetic reinforcement and foundation soils on the performance of reinforced embankments[J]. Geotextiles and Geomembranes,2008,26:317-334
[24]Dennes T. Bergado, Chairat Teerawattanasuk.2D and 3D numerical simulations of reinforced embankments on soft ground[J]. Geotextiles and Geomembranes,2008,26:39-55
[25]T. Tanchaisawat, D. T. Bergado, P. Voottipruex. Numerical simulation and sensitivity analyses of full-scale test embankment with reinforced lightweight geomaterials on soft Bangkok clay[J]. Geotextiles and Geomembranes,2008,26:498-511
[26]K. ADALIER, A. PAMUK.T. F. ZIMMIE. Earthquake retrofit of highway/railway embankments by sheet-pile walls[J]. Geotechnical and Geological Engineering,2004,22:73-88
[27]S. Murugesan, K. Rajagopal. Geosynthetic-encased stone columns:Numerical evaluation[J]. Geotextiles and Geomembranes 2006,24:349-358
[28]H. G. Poulos, F. ASCE. Design Charts for Piles Supporting Embankments on Soft Clay[J]. Journal of Geotechnical and Geoenvironmental Engineering,2007,133(5):493-501
[29]Sari W. Abusharar, Jun-Jie Zheng, Bao-Guo Chen, Jian-Hua Yin. A simplified method for analysis of a piled embankment reinforced with geosynthetics[J]. Geotextiles and Geomembranes,2009,27:39-52
[30]Sari W. Abusharar, Jun-Jie Zheng, Bao-Guo Chen. Finite element modeling of the consolidation behavior of multi-column supported road embankment[J]. Computers and Geotechnics,2009,36:676-685
[31]J. S. Sharma, M. D. Bolton. Centrifugal and numerical modelling of reinforced embankments on soft clay installed with wick drains[J]. Geotextiles and Geomembranes,2001,19:23-44
[32]Jose Leitao Borges. Three-dimensional analysis of embankments on soft soils incorporating vertical drains by finite element method[J]. Computers and Geotechnics,2004,31:665-676
[33]R. Kerry Rowe, C. Taechakumthorn. Combined effect of PVDs and reinforcement on embankments over rate-sensitive soils[J]. Geotextiles and Geomembranes,2008,26:239-249
[34]Tuan Anh Tran, Toshiyuki Mitachi. Equivalent plane strain modeling of vertical drains in soft ground under embankment combined with vacuum preloading[J]. Computers and Geotechnics,2008,35:655-672
[35]Abdulazim Yildiz. Numerical analyses of embankments on PVD improved soft clays[J]. Advances in Engineering Software,2009,40:1047-1055
[36]郭院成,张浩华,张军.软土高填方路基后处理方案的优化设计[J].河南科学,2003,21(5)：640-643
[37]郭院成,张浩华,周同和.高速公路高填方软基处理方法的对比分析[J].郑州大学学报(工学版),2002,23(2)：31-33
[38]蒋蒙宾,周磊,王昆勇.无砂砼小桩后处理复合地基应力路径与固结分析[J].河南科学,2010(9)：1157-1160
[39]童怀峰,郭院成,张浩华.无砂砼小桩后处理高填方软基的固结过程分析[J].河南科学,2005,23(5)：66-69
[40]刘海涛.黄土地区桥头跳车处理新方法研究[D].[硕士学位论文].郑州：郑州大学,2004
[41]闫雪松.用无砂砼小桩控制高填方路基变形[J].中国新技术新产品,2009(13)：61
[42]童怀峰,杨淑慧,郭院成.高填方路基基于变形控制的后处理优化设计[J].河南科学,2005(12)：870-873
[43]应荣华,郑健龙.老路拓宽沉降规律ANSYS有限元分析[J].公路,2006(4)：140-143
[44]肖伟,王建西,马斌.京津城际永乐站CFG桩复合地基沉降有限元分析[J].铁道建筑,2007(7)：75-77
[45]王秀格,乔兰,于德水.强夯法处理湿陷性黄土路基效果的数值分析[J].施工技术,2007,36(增刊)：374-378
[46]孙献国.粉喷桩与土工格栅联合加固技术的数值模拟分析研究[J].公路交通科技,2004(5)：47-49
[47]连金,张印涛,邹祖银等.黄土加筋路堤的数值模拟及性能分析[J].公路交通科技,2006,23(12)：32-36
[48]蒋鑫,凌建明.软土地区桩柱式路基力学行为的数值模拟[J].交通运输工程学报,2007,7(6)：70-75
[49]马南飞.高速公路软十路基沉降规律监测及FLAC模拟[J].西安建筑科技大学学报,2007,27(2)：251-254
[50]程栋栋,闫澍旺,侯晋芳等.桩与土工格栅联合作用对高速公路路堤地基承载力影响的有限元分析[J].岩土力学,2007,28(增刊)：886-890
[51]俞永华,谢永利,杨晓华等.土工格室柔性搭板处治的路桥过渡段差异沉降三维数值分析[J].中国公路学报,2007,20(4)：12-18
[52]谢永利,俞永华,杨晓华.土工格室在处治路基不均匀沉降中的应用研究[J].中国公路学报,2004,17(4)：7-10
[53]孙吉主,高晖.ABAQUS在软基固结过程分析中的应用[J].岩土力学,2007,28(增刊)：919-922
[54]段仲沅,甄精莲,贾瑞晨等.基于ABAQUS预测某深基坑支护结构变形及其加固措施[J].施工技术,2007,36(11)：60-62
[55]年廷凯,栾茂田,蒋景彩.基于强度折减弹塑性有限元法的抗滑桩加固边坡稳定性分析[J].岩土力学,2007,28(增刊)：558-562
[56]雷学文,陈凯杰.桩-网复合地基承载及变形特性的有限元分析[J].岩土力学,2007,28(增刊)：819-822
[57]Geddes J D. Stress in foundation Soils due to vertical subsurface load[J]. Geotechnique,1966 (16):231-255
[58]陈希哲.士力学及基础工程[M].北京：中央广播电视大学出版社,1995
[59]龚晓南.复合地基理论及工程应用[M].北京：中国建筑工业出版社,2007
[60]庄茁,张帆,岑松.ABAQUS非线性有限元分析与实例[M].北京：科学出版社,2005
[2]冯伟凯,眭爱宏,陈振国.高填方车站大面积软土地基整治技术[J].路基工程,铁道标准设计,2003(增刊)：184-186
[3]刘景政,杨素春,钟冬波.地基处理与实例分析[M].北京：中国建筑工业出版社,1998
[4]田利平.谈石灰桩加固软土地基[J].山西建筑,2004(1)：14-15
[5]李明杰,李鹏,靳明.高填方路堤复合地基处治研究[J].中外公路,2005,25(3)：21-23
[6]张杨.刚性桩复合地基作用机理及沉降分析[D].[硕士学位论文].合肥：合肥工业大学,2010
[7]马凡.CFG桩复合地基降低高填方路基沉降的计算及应用[J].公路,2006,2(2)：84-87
[8]王斌,徐泽中.预应力管桩在高速公路拼接工程软基处理中的设计方法[J].公路,2004,2：84-88
[9]赵明华.土力学与地基基础[M].武汉：武汉理工大学出版社,2003
[10]李道生.高填方地段强夯处理湿陷性黄土夯击参数的选择[J].路基工程,2005(1)：25-28
[11]管殿聆,阎万里.冲击式压路机在湿陷性黄土高填方重载路基上的应用[J].铁道标准设计,2001,21(11)：24-25
[12]陈希哲.土力学地基基础[M].北京：清华大学出版社,2003
[13]林道义.高压旋喷注浆法加固软弱地基简介[J].工程勘察,1985(4)：30-34
[14]胡明清,周志超.高压旋喷注浆法处理软弱地基在工程中的应用[J].化工设计通讯,1999(9)：59-62
[15]楚斌.软土路基排水固结机理研究及应用[D].武汉：中国科学院武汉岩土力学研究所,2003
[16]戴以宪,刑积华.浅谈软土路基排水固结法施工的质量控制[J].科技信息,2006(7)：68-69
[17]V. Tandjiria, B. K. Lowb. C. I. Teh. The Effect of reinforcement force distribution on stability of embankments [J]. Geotextiles and Geomembranes,2002(20):423-443
[18]Dennes. T. Bergadoa, Pham V. Longb, B. R. Srinivasa Murthy. A case study of geotextile-reinforced embankment on soft ground[J]. Geotextiles and Geomembranes,2002, 20:343-365
[19]Jose Leitao Borges, Antonio Silva Cardoso. Overall stability of geosynthetic-reinforced embankments on soft soils[J]. Geotextiles and Geomembranes,2002,20:395-421
[20]Sean D. Hinchberger, R. Kerry Rowe. Geosynthetic reinforced embankments on soft clay foundations:predicting reinforcement strains at failure[J]. Geotextiles and Geomembranes 2003,21,151-175
[21]B. S. Bakir, E. Akis. Analysis of a highway embankment failure associated with the 1999 Duzce, Turkey earthquake[J]. Soil Dynamics and Earthquake Engineering,2005,25, 251-260
[22]A. K. Sinha, Vasant G. Havanagi, Sudhir Mathur. Inflection point method for predicting settlement of PVD improved soft clay under embankments[J]. Geotextiles and Geomembranes,2007,25:336-345
[23]Allen Lunzhu Li, R. Kerry Rowe. Effects of viscous behavior of geosynthetic reinforcement and foundation soils on the performance of reinforced embankments[J]. Geotextiles and Geomembranes,2008,26:317-334
[24]Dennes T. Bergado, Chairat Teerawattanasuk.2D and 3D numerical simulations of reinforced embankments on soft ground[J]. Geotextiles and Geomembranes,2008,26:39-55
[25]T. Tanchaisawat, D. T. Bergado, P. Voottipruex. Numerical simulation and sensitivity analyses of full-scale test embankment with reinforced lightweight geomaterials on soft Bangkok clay[J]. Geotextiles and Geomembranes,2008,26:498-511
[26]K. ADALIER, A. PAMUK.T. F. ZIMMIE. Earthquake retrofit of highway/railway embankments by sheet-pile walls[J]. Geotechnical and Geological Engineering,2004,22:73-88
[27]S. Murugesan, K. Rajagopal. Geosynthetic-encased stone columns:Numerical evaluation[J]. Geotextiles and Geomembranes 2006,24:349-358
[28]H. G. Poulos, F. ASCE. Design Charts for Piles Supporting Embankments on Soft Clay[J]. Journal of Geotechnical and Geoenvironmental Engineering,2007,133(5):493-501
[29]Sari W. Abusharar, Jun-Jie Zheng, Bao-Guo Chen, Jian-Hua Yin. A simplified method for analysis of a piled embankment reinforced with geosynthetics[J]. Geotextiles and Geomembranes,2009,27:39-52
[30]Sari W. Abusharar, Jun-Jie Zheng, Bao-Guo Chen. Finite element modeling of the consolidation behavior of multi-column supported road embankment[J]. Computers and Geotechnics,2009,36:676-685
[31]J. S. Sharma, M. D. Bolton. Centrifugal and numerical modelling of reinforced embankments on soft clay installed with wick drains[J]. Geotextiles and Geomembranes,2001,19:23-44
[32]Jose Leitao Borges. Three-dimensional analysis of embankments on soft soils incorporating vertical drains by finite element method[J]. Computers and Geotechnics,2004,31:665-676
[33]R. Kerry Rowe, C. Taechakumthorn. Combined effect of PVDs and reinforcement on embankments over rate-sensitive soils[J]. Geotextiles and Geomembranes,2008,26:239-249
[34]Tuan Anh Tran, Toshiyuki Mitachi. Equivalent plane strain modeling of vertical drains in soft ground under embankment combined with vacuum preloading[J]. Computers and Geotechnics,2008,35:655-672
[35]Abdulazim Yildiz. Numerical analyses of embankments on PVD improved soft clays[J]. Advances in Engineering Software,2009,40:1047-1055
[36]郭院成,张浩华,张军.软土高填方路基后处理方案的优化设计[J].河南科学,2003,21(5)：640-643
[37]郭院成,张浩华,周同和.高速公路高填方软基处理方法的对比分析[J].郑州大学学报(工学版),2002,23(2)：31-33
[38]蒋蒙宾,周磊,王昆勇.无砂砼小桩后处理复合地基应力路径与固结分析[J].河南科学,2010(9)：1157-1160
[39]童怀峰,郭院成,张浩华.无砂砼小桩后处理高填方软基的固结过程分析[J].河南科学,2005,23(5)：66-69
[40]刘海涛.黄土地区桥头跳车处理新方法研究[D].[硕士学位论文].郑州：郑州大学,2004
[41]闫雪松.用无砂砼小桩控制高填方路基变形[J].中国新技术新产品,2009(13)：61
[42]童怀峰,杨淑慧,郭院成.高填方路基基于变形控制的后处理优化设计[J].河南科学,2005(12)：870-873
[43]应荣华,郑健龙.老路拓宽沉降规律ANSYS有限元分析[J].公路,2006(4)：140-143
[44]肖伟,王建西,马斌.京津城际永乐站CFG桩复合地基沉降有限元分析[J].铁道建筑,2007(7)：75-77
[45]王秀格,乔兰,于德水.强夯法处理湿陷性黄土路基效果的数值分析[J].施工技术,2007,36(增刊)：374-378
[46]孙献国.粉喷桩与土工格栅联合加固技术的数值模拟分析研究[J].公路交通科技,2004(5)：47-49
[47]连金,张印涛,邹祖银等.黄土加筋路堤的数值模拟及性能分析[J].公路交通科技,2006,23(12)：32-36
[48]蒋鑫,凌建明.软土地区桩柱式路基力学行为的数值模拟[J].交通运输工程学报,2007,7(6)：70-75
[49]马南飞.高速公路软十路基沉降规律监测及FLAC模拟[J].西安建筑科技大学学报,2007,27(2)：251-254
[50]程栋栋,闫澍旺,侯晋芳等.桩与土工格栅联合作用对高速公路路堤地基承载力影响的有限元分析[J].岩土力学,2007,28(增刊)：886-890
[51]俞永华,谢永利,杨晓华等.土工格室柔性搭板处治的路桥过渡段差异沉降三维数值分析[J].中国公路学报,2007,20(4)：12-18
[52]谢永利,俞永华,杨晓华.土工格室在处治路基不均匀沉降中的应用研究[J].中国公路学报,2004,17(4)：7-10
[53]孙吉主,高晖.ABAQUS在软基固结过程分析中的应用[J].岩土力学,2007,28(增刊)：919-922
[54]段仲沅,甄精莲,贾瑞晨等.基于ABAQUS预测某深基坑支护结构变形及其加固措施[J].施工技术,2007,36(11)：60-62
[55]年廷凯,栾茂田,蒋景彩.基于强度折减弹塑性有限元法的抗滑桩加固边坡稳定性分析[J].岩土力学,2007,28(增刊)：558-562
[56]雷学文,陈凯杰.桩-网复合地基承载及变形特性的有限元分析[J].岩土力学,2007,28(增刊)：819-822
[57]Geddes J D. Stress in foundation Soils due to vertical subsurface load[J]. Geotechnique,1966 (16):231-255
[58]陈希哲.士力学及基础工程[M].北京：中央广播电视大学出版社,1995
[59]龚晓南.复合地基理论及工程应用[M].北京：中国建筑工业出版社,2007
[60]庄茁,张帆,岑松.ABAQUS非线性有限元分析与实例[M].北京：科学出版社,2005