泰州地区粉土路基填筑技术研究
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摘要
近些年来,随着我国经济的高速发展,我国的公路建设也进入了蓬勃发展的时期。但是由于交通量和汽车轴重的增加以及施工设计等原因公路病害层出不穷,尤其是在粉土地区。大量实践证明,对路基进行有效的压实,是提高公路使用寿命的有效手段。所以有效的压实路基在公路建设中具有重要意义。
泰州市位于长江中下游,辖区范围内广泛分布着低液限粉土。粉土既不同于粘土,又有别于砂土,具有独特的工程性质。粉土级配不良,粘聚力和保水性差,采用常规的压实工艺难以达到理想的压实状态。因此,如何利用泰州地区的低液限粉土进行路基填筑,并使路基获得足够的压实度具有重要的工程意义。众多研究表明,如果碾压工艺选取适当,就能够使粉土路基获得足够的压实度,所以本文以低液限粉土的碾压工艺为核心,主要完成了以下研究工作:
(1)通过室内试验研究泰州地区粉土的级配情况、液塑限、最佳含水量和最佳干密度等物理特性。在泰州地区粉土物理特性和压实理论研究的基础上,提出多种碾压工艺,并进行现场碾压试验。通过不同碾压工艺下的压实度对比分析,寻求适合泰州地区粉土的最佳压实工艺。
(2)在现场碾压试验的基础上,设计和制定动力测试方案,对振动压路机在路基中产生的加速度进行测量。通过对加速度信号分析整理,研究加速度沿深度方向的分布情况,以及振动能量的衰减规律。
(3)基于ABAQUS大型有限元分析平台,建立路基碾压的三维有限元模型。并将数值模拟结果与实测结果对比,证明了模型的正确性。利用所建立的有限元模型,研究了不同碾压工艺、松铺厚度和碾压速度对压实度的影响。
(4)利用ABAQUS有限元软件,对粉土边坡降雨入渗进行数值模拟试验,研究边坡降雨后的变形情况,并研究植被对边坡降雨入渗的防护作用。
Recently, along with the rapid development of Chinese economy, road construction in our country is also booming. However, highway distress, particularly in silt areas, keeps cropping up due to increasing traffic volume and car axle load as well as problems concerning road design and construction. It is widely proved that effective compaction of subgrade helps enlarge road service life. Therefore, effectively compacting subgrade plays a significant role in road construction.
Taizhou city, located in the middle and lower reaches of the Yangtze River, abounds in low liquid limit silt. Silt is different from clay and sand and has its unique engineering properties. As silt is characteristic of poor gradation, cohesion and water-retention ability, ideal compaction is hard to achieve by employing conventional compacting technique. So it is significant to study roadbed filling using low liquid limit silt in Taizhou area while ensuring sufficient compactedness. For this purpose, this thesis, focusing on rolling compaction technique of low liquid limit silt, has carried out the following tasks.
(1) Laboratory test has been conducted to get the physical properties of silt in Taizhou area like gradation, liquid plastic limit, optimum moisture content and optimum dry density, based on which various rolling compaction techniques are put forward and field compaction experiments are conducted. The best compaction technique is found after comparing the compactedness under different techniques.
(2) Dynamic test scheme is designed and formulated on the basis of field rolling compaction experiments to test the acceleration of vibrating roller in the subgrade. Signal analysis is conducted on the acceleration to study the distribution of acceleration along the depth and attenuation law of dynamic energy.
(3) Three-dimensional finite element model on roadbed rolling compaction is established on the basis of ABAQUS large scale finite element analysis tool. Numerical simulation results are contrasted with real test results to validate the model. By virtue of the established finite element model, influences of different rolling compaction techniques, loose laying depths and rolling compaction speeds on compactedness are studied.
(4) With the help of ABAQUS finite element software, numerical simulation test is conducted on silt side-slope rainfall infiltration, in an effort to study the slope deformation after rainfall and the protective effect of vegetation against the slope rainfall infiltration.
泰州市位于长江中下游,辖区范围内广泛分布着低液限粉土。粉土既不同于粘土,又有别于砂土,具有独特的工程性质。粉土级配不良,粘聚力和保水性差,采用常规的压实工艺难以达到理想的压实状态。因此,如何利用泰州地区的低液限粉土进行路基填筑,并使路基获得足够的压实度具有重要的工程意义。众多研究表明,如果碾压工艺选取适当,就能够使粉土路基获得足够的压实度,所以本文以低液限粉土的碾压工艺为核心,主要完成了以下研究工作:
(1)通过室内试验研究泰州地区粉土的级配情况、液塑限、最佳含水量和最佳干密度等物理特性。在泰州地区粉土物理特性和压实理论研究的基础上,提出多种碾压工艺,并进行现场碾压试验。通过不同碾压工艺下的压实度对比分析,寻求适合泰州地区粉土的最佳压实工艺。
(2)在现场碾压试验的基础上,设计和制定动力测试方案,对振动压路机在路基中产生的加速度进行测量。通过对加速度信号分析整理,研究加速度沿深度方向的分布情况,以及振动能量的衰减规律。
(3)基于ABAQUS大型有限元分析平台,建立路基碾压的三维有限元模型。并将数值模拟结果与实测结果对比,证明了模型的正确性。利用所建立的有限元模型,研究了不同碾压工艺、松铺厚度和碾压速度对压实度的影响。
(4)利用ABAQUS有限元软件,对粉土边坡降雨入渗进行数值模拟试验,研究边坡降雨后的变形情况,并研究植被对边坡降雨入渗的防护作用。
Recently, along with the rapid development of Chinese economy, road construction in our country is also booming. However, highway distress, particularly in silt areas, keeps cropping up due to increasing traffic volume and car axle load as well as problems concerning road design and construction. It is widely proved that effective compaction of subgrade helps enlarge road service life. Therefore, effectively compacting subgrade plays a significant role in road construction.
Taizhou city, located in the middle and lower reaches of the Yangtze River, abounds in low liquid limit silt. Silt is different from clay and sand and has its unique engineering properties. As silt is characteristic of poor gradation, cohesion and water-retention ability, ideal compaction is hard to achieve by employing conventional compacting technique. So it is significant to study roadbed filling using low liquid limit silt in Taizhou area while ensuring sufficient compactedness. For this purpose, this thesis, focusing on rolling compaction technique of low liquid limit silt, has carried out the following tasks.
(1) Laboratory test has been conducted to get the physical properties of silt in Taizhou area like gradation, liquid plastic limit, optimum moisture content and optimum dry density, based on which various rolling compaction techniques are put forward and field compaction experiments are conducted. The best compaction technique is found after comparing the compactedness under different techniques.
(2) Dynamic test scheme is designed and formulated on the basis of field rolling compaction experiments to test the acceleration of vibrating roller in the subgrade. Signal analysis is conducted on the acceleration to study the distribution of acceleration along the depth and attenuation law of dynamic energy.
(3) Three-dimensional finite element model on roadbed rolling compaction is established on the basis of ABAQUS large scale finite element analysis tool. Numerical simulation results are contrasted with real test results to validate the model. By virtue of the established finite element model, influences of different rolling compaction techniques, loose laying depths and rolling compaction speeds on compactedness are studied.
(4) With the help of ABAQUS finite element software, numerical simulation test is conducted on silt side-slope rainfall infiltration, in an effort to study the slope deformation after rainfall and the protective effect of vegetation against the slope rainfall infiltration.
引文
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[4]韩丁,黄晓明,黄英.振动压路机不同参数对土基压实效果的分析[J].公路交通科技,2009.8.
[5]支喜兰,江晓霞,沙爱民.路面基层振动压实作用下的底基层应力[J].长安大学学报(自然科学版),2003,23(3):33-36.
[6]李光林.小型振动压路机压实效果的有限元分析[D].西安:长安大学,2008.
[7]吴宏伟,陈守义,庞宇威.雨水入渗对非饱和土坡稳定性影响的参数研究[J].岩土力学,1999,20(1):1-14.
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[9] Wallays.M. Deep compaction by vertical and horizontal vibration[J].Recent Developments in Ground Improvement Techeniques,1985A,Balkema:53-70.
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[11] Anon. Dam Foundations strengthened by deep dynamic compaction[J]. Highway and Heavy Construction,1987,130(6):70-71.
[12] Dumas,Jean C. Dynamic compaction of saturated silt and silty sand-A case history[J]. Geotechnical Special publication,1994,45:9-13.
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[15]刘肇生.含砂低液限粉土的击实试验与研究[J].公路,1984,8:29-31.
[16]申爱琴,郑南翔,苏毅,等.含砂低液限粉土填筑路基压实机理及施工技术研究[J].中国公路学报,2000,13(4):13-15.
[17]叶东升,范跃武,沙爱民,等.商开高速公路粉性土路基填筑技术研究[J].公路,2001,9:114-117.
[18]杨人凤.冲击与振动复合压实技术的研究[D].西安:长安大学,2003.
[19]曹卫东,商庆森,宋修广.低液限粉土路基压实机理与性能的研究[J].华东公路,2003,3:55-57.
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[22]薛晖.低液限粉土压实及底基层稳定性能研究[D].西安:长安大学,2006.
[23]王俊杰,阎宗岭,李海平等.含砂低液限粉土录用施工技术研究[J].公路,2007,6:83-87.
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