南百铁路钢管格栅膨胀土挡墙数值模拟研究
|
摘要
西南地区分布有大面积膨胀土,传统支护措施对膨胀土边坡的支护效果并不理想。针对这一问题,本文以南宁-昆明铁路增建二线工程百色地区膨胀土弃渣边坡为工程背景,提出一种刚柔结合的钢管格栅膨胀土挡墙,并采用FLAC 3D模拟技术研究验证了该支护措施的有效性及选取了合理的钢管间距。研究表明:(1)钢管格栅膨胀土挡墙在膨胀土边坡含水率变化时,能够有效限制膨胀土边坡的变形;(2)相较于传统土工格栅挡墙,钢管的加入加强了钢管格栅膨胀土挡墙的整体刚度,能够协调墙体不同高度的变形及位移,保证墙体的稳定性;(3)贯入土体的钢管增加了挡墙整体的抗滑和抗弯能力,减少其在水平方向的变形和位移,防止土体中含水率过大时发生塌滑;(4)该新型支护措施应采用梅花式布管。该研究可为类似研究和工程提供参考依据。
Large areas of expansive soil are widely distributed in Southwest China. The traditional support measures cannot support the expansive soil slope effectively. In order to solve this problem,based on the expansive soil waste slope in Baise area of second railway line of Nanning-Kunming Railway,this paper puts forward a rigid-flexible retaining wall with steel pipe grid,uses FLAC 3 D simulation technology to verify the effectiveness of the support measure and select a reasonable distance between steel pipes. The study results show that:(1) the expansive soil retaining wall with steel pipe grid can effectively restrict the deformation of expansive soil slope when the moisture content of expansive soil slope changes;(2) compared with traditional geogrid retaining wall,steel pipe can reinforce the overall stiffness of expansive soil retaining wall with steel tube grid,coordinate the deformation and displacement of the wall body at different heights,and ensure the stability of the wall body;(3) the steel pipe penetrating into the soil can increase the overall anti-sliding and anti-bending capacity of the retaining wall,reduce its deformation and displacement in the horizontal direction,and prevents the collapse of the soil when the moisture content is too large;(4) The quincuncial pattern shall be adopted for steel pipe arrangement in the new support measure. This study can provide references for similar study and project.
Large areas of expansive soil are widely distributed in Southwest China. The traditional support measures cannot support the expansive soil slope effectively. In order to solve this problem,based on the expansive soil waste slope in Baise area of second railway line of Nanning-Kunming Railway,this paper puts forward a rigid-flexible retaining wall with steel pipe grid,uses FLAC 3 D simulation technology to verify the effectiveness of the support measure and select a reasonable distance between steel pipes. The study results show that:(1) the expansive soil retaining wall with steel pipe grid can effectively restrict the deformation of expansive soil slope when the moisture content of expansive soil slope changes;(2) compared with traditional geogrid retaining wall,steel pipe can reinforce the overall stiffness of expansive soil retaining wall with steel tube grid,coordinate the deformation and displacement of the wall body at different heights,and ensure the stability of the wall body;(3) the steel pipe penetrating into the soil can increase the overall anti-sliding and anti-bending capacity of the retaining wall,reduce its deformation and displacement in the horizontal direction,and prevents the collapse of the soil when the moisture content is too large;(4) The quincuncial pattern shall be adopted for steel pipe arrangement in the new support measure. This study can provide references for similar study and project.
引文
[1] Hoek,E. P. K. Kaiser,and W. F. Bawden. Support of Underground Excavations in Hard Rock[M]. Rotterdam:A. A. Balkema,1995,267-269.
[2]周志刚,杨和平,郭天龙,等.云南楚大公路土工格网处理台背填料试验工程的施工与检测[J].华东公路,2000,23(6):44-46.ZHOU Zhigang,YANG Heping,GUO Tianlong,et al. Construction and Detection of Geogrid Treatment Bed Back Filling Test Project of Yunnan Chuda Highway[J]. East China Highway,2000,23(6):44-46.
[3]杨和平,程斌,肖杰,等.土工格栅反包加筋支护膨胀土堑坡的工作机理[J].公路交通科技,2015,32(9):1-8.YANG Heping,CHENG Bin,XIAO Jie,et al. Working Mechanism of Turn-up Geogrid Reinforced Expansive Soil Cutting Slope[J].Journal of Highway and Transportation Research and Development,2015,32(9):1-8.
[4]封志军,王毅敏,曾锐,等.高烈度地震区强膨胀土路堑高边坡设计探讨[J].高速铁路技术,2018,9(3):28-30.FENG Zhijun,WANG Yimin,ZENG Rui,et al. The Design for Strong Expansive Soil High Cutting Slope in High Intensity Earthquake Area[J]. High Speed Railway Technology,2018,9(3):28-30.
[5]赵文建.百色膨胀土堑坡开挖的演化规律及柔性支护技术研究[D].长沙:长沙理工大学,2010.ZHAO Wenjian. Study on Evolution Law and Flexible Supporting Technology of Expansive Soil Cutting Slope in Baise Area[D].Changsha:Changsha University of Science&Technology,2010.
[6]曾仲毅,徐帮树,胡世权,等.增湿条件下膨胀土隧道衬砌破坏数值分析[J].岩土力学,2014,35(3):871-880.ZENG Zhongyi, XU Bangshu, HU Shiquan, et al. Numerical Analysis of Tunnel Lining Failure Mechanism in Expansive Soil Considering Water-increased State[J]. Rock and Soil Mechanics,2014,35(3):871-880.
[7]付光强.成都地区膨胀土基坑支护技术研究[D].成都:西南交通大学,2015.FU Guangqiang. Study on Supporting Technology for Expansive Soil Foundation Pit in Chengdu Area[D]. Chengdu:Southwest Jiaotong University,2015.
[8]范臻辉,张春顺,肖宏彬.基于流固耦合特性的非饱和膨胀土变形仿真计算[J].中南大学学报(自然科学版),2011,56(3):758-764.FAN Zhenhui, ZHANG Chunshun, XIAO Hongbin. Simulation Analysis of Deformation for Unsaturated Expansive Soils Based on Fluid-solid Coupling Characteristics[J]. Journal of Central South University(Science and Technology),2011,56(3):758-764.
[9]侯跃,刘涛,黄永亮.基于热力耦合数值模拟的膨胀土深基坑变形特性研究[C]//2016年全国工程地质学术年会论文集,2016:849-857.HOU Yue, LIU Tao, HUANG Yongliang. Study on Deformation Characteristics of Expansive Soil Deep Foundation Pit Based on Thermal-mechanical Coupled Numerical Simulation[C]//Proceedings of 2016 National Academic Conference on Engineering Geology,2016:849-857.
[10]浦敏艳,朱克生,王柳江.降雨入渗作用下膨胀土挡土墙侧向土压力研究[J].人民黄河,2015,37(11):125-128.PU Minyan,ZHU Kesheng,WANG Liujiang. Research on Lateral Earth Pressure from Expansive Soil Acting on Retaining Wall under Rainfall Infiltration[J]. Yellow River,2015,37(11):125-128.
[2]周志刚,杨和平,郭天龙,等.云南楚大公路土工格网处理台背填料试验工程的施工与检测[J].华东公路,2000,23(6):44-46.ZHOU Zhigang,YANG Heping,GUO Tianlong,et al. Construction and Detection of Geogrid Treatment Bed Back Filling Test Project of Yunnan Chuda Highway[J]. East China Highway,2000,23(6):44-46.
[3]杨和平,程斌,肖杰,等.土工格栅反包加筋支护膨胀土堑坡的工作机理[J].公路交通科技,2015,32(9):1-8.YANG Heping,CHENG Bin,XIAO Jie,et al. Working Mechanism of Turn-up Geogrid Reinforced Expansive Soil Cutting Slope[J].Journal of Highway and Transportation Research and Development,2015,32(9):1-8.
[4]封志军,王毅敏,曾锐,等.高烈度地震区强膨胀土路堑高边坡设计探讨[J].高速铁路技术,2018,9(3):28-30.FENG Zhijun,WANG Yimin,ZENG Rui,et al. The Design for Strong Expansive Soil High Cutting Slope in High Intensity Earthquake Area[J]. High Speed Railway Technology,2018,9(3):28-30.
[5]赵文建.百色膨胀土堑坡开挖的演化规律及柔性支护技术研究[D].长沙:长沙理工大学,2010.ZHAO Wenjian. Study on Evolution Law and Flexible Supporting Technology of Expansive Soil Cutting Slope in Baise Area[D].Changsha:Changsha University of Science&Technology,2010.
[6]曾仲毅,徐帮树,胡世权,等.增湿条件下膨胀土隧道衬砌破坏数值分析[J].岩土力学,2014,35(3):871-880.ZENG Zhongyi, XU Bangshu, HU Shiquan, et al. Numerical Analysis of Tunnel Lining Failure Mechanism in Expansive Soil Considering Water-increased State[J]. Rock and Soil Mechanics,2014,35(3):871-880.
[7]付光强.成都地区膨胀土基坑支护技术研究[D].成都:西南交通大学,2015.FU Guangqiang. Study on Supporting Technology for Expansive Soil Foundation Pit in Chengdu Area[D]. Chengdu:Southwest Jiaotong University,2015.
[8]范臻辉,张春顺,肖宏彬.基于流固耦合特性的非饱和膨胀土变形仿真计算[J].中南大学学报(自然科学版),2011,56(3):758-764.FAN Zhenhui, ZHANG Chunshun, XIAO Hongbin. Simulation Analysis of Deformation for Unsaturated Expansive Soils Based on Fluid-solid Coupling Characteristics[J]. Journal of Central South University(Science and Technology),2011,56(3):758-764.
[9]侯跃,刘涛,黄永亮.基于热力耦合数值模拟的膨胀土深基坑变形特性研究[C]//2016年全国工程地质学术年会论文集,2016:849-857.HOU Yue, LIU Tao, HUANG Yongliang. Study on Deformation Characteristics of Expansive Soil Deep Foundation Pit Based on Thermal-mechanical Coupled Numerical Simulation[C]//Proceedings of 2016 National Academic Conference on Engineering Geology,2016:849-857.
[10]浦敏艳,朱克生,王柳江.降雨入渗作用下膨胀土挡土墙侧向土压力研究[J].人民黄河,2015,37(11):125-128.PU Minyan,ZHU Kesheng,WANG Liujiang. Research on Lateral Earth Pressure from Expansive Soil Acting on Retaining Wall under Rainfall Infiltration[J]. Yellow River,2015,37(11):125-128.