高速公路拓宽工程差异沉降及处治技术研究
发布时间：2018-10-05 10:58
【摘要】：新世纪以来,伴随着公路交通量的大幅度增长,一些高速公路的通行能力已经不能满足经济快速发展的需求,严重阻碍了区域间经济的发展。因此必须对部分高速公路进行拓宽改建。相关规范对高速公路改扩建工程只作了一些简洁的说明以及对加宽路基作了一些原则上的规定,工作人员只能凭借以往的项目经验进行工作。因此必须深入研究高速公路拓宽工程的相关情况,其中新-老路基的差异沉降是主要研究的方向。徐州至明光高速公路江苏段的睢宁西枢纽拓宽工程采用异型单喇叭的枢纽型式,与宁宿徐高速成T形交叉,存在局部拼接,包括:定向匝道、单向单车道匝道和对向双车道匝道。在调查和初步分析了高速公路改扩建工程存在的问题与相关处治技术的基础上,依托睢宁西枢纽拓宽工程,建立有限元分析模型,分析不同因素对拓宽路基差异沉降的影响。因素主要包括:拓宽方式及宽度、拓宽路基的填筑高度、新-老路基的模量差异、新-老地基不同的固结程度。为了减小新-老路基的差异沉降,提出了对老路基进行削坡与台阶开挖和铺设土工格室技术措施。通过研究分析与总结并得出:对比双侧拓宽与单侧拓宽,认为双侧拓宽更有优势;路基填筑高度或者宽度的增加,对新-老路基的差异沉降和路基坡脚水平位移具有较大的影响;新路基弹性模量的改变对新-老路基的最大差异沉降值的影响规律;对比新-老地基不同的固结程度差异对新-老路基的差异沉降和坡脚的水平位移影响规律;老路基在1:1.25坡度削坡情况下按80cm高、100cm宽来开挖台阶是比较合理的,然后在新路基底部和路床底部分别铺设一层土工格室,可以更好的降低新-老路基的差异沉降,提高新-老路基的稳定性;另外,在新-老路基不均匀沉降工况下分析了老路面开挖台阶的宽度对新-老路面结构的受力影响,结果表明台阶开挖宽度为60cm是比较合理的。
[Abstract]:Since the new century, with the rapid growth of highway traffic, the traffic capacity of some freeways has been unable to meet the needs of rapid economic development, which seriously hinders the development of interregional economy. Therefore, some expressway must be widened and rebuilt. The related code only makes some brief explanation to the expressway reconstruction and extension project and some principle stipulation to the widening roadbed. The staff can only work on the basis of the past project experience. Therefore, it is necessary to deeply study the relevant situation of expressway widening project, in which the differential settlement between new and old subgrade is the main research direction. The Suining West Hub widening Project from Xuzhou to Mingguang Expressway in Jiangsu Province adopts the special type of single horn hub type. It intersects with the Ningsuxu Expressway to form a T-shaped junction, and there are local splicing, including: directional ramps, One way single lane ramp and two opposite lane ramps. Based on the investigation and preliminary analysis of the existing problems and related treatment techniques in the expressway reconstruction and extension project, the finite element analysis model was established based on the widening project of Suining West Hub, and the influence of different factors on the differential settlement of the widening roadbed was analyzed. The main factors include: widening mode and width, widening the height of embankment, the difference of modulus between new and old subgrade, the consolidation degree of new and old foundation. In order to reduce the differential settlement of the new and old subgrade, the technical measures of cutting slope and step excavation and laying geogrid chamber of the old subgrade are put forward. Through research, analysis and conclusion, it is concluded that by comparing bilateral widening with unilateral widening, bilateral widening is more advantageous, and the height or width of embankment filling is increased. It has great influence on the differential settlement of the new and old subgrade and the horizontal displacement of the slope foot of the roadbed, and the influence of the change of the elastic modulus of the new subgrade on the maximum differential settlement value of the new and old subgrade. Comparing the influence of different consolidation degree between new and old subgrade on the differential settlement and horizontal displacement of the new and old subgrade, it is reasonable for the old subgrade to excavate the steps according to the width of 100cm of 80cm height when the slope of the old subgrade is cut at 1: 1.25. Then a layer of geotechnical compartment is laid at the bottom of the new road foundation and the bottom of the road bed, which can better reduce the differential settlement of the new and old subgrade and improve the stability of the new and old subgrade. Under the condition of uneven settlement of the new and old roadbed, the influence of the width of the old pavement excavation step on the new and old pavement structure is analyzed. The results show that the excavation width of the step is reasonable to 60cm.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1
本文编号：2253123
[Abstract]:Since the new century, with the rapid growth of highway traffic, the traffic capacity of some freeways has been unable to meet the needs of rapid economic development, which seriously hinders the development of interregional economy. Therefore, some expressway must be widened and rebuilt. The related code only makes some brief explanation to the expressway reconstruction and extension project and some principle stipulation to the widening roadbed. The staff can only work on the basis of the past project experience. Therefore, it is necessary to deeply study the relevant situation of expressway widening project, in which the differential settlement between new and old subgrade is the main research direction. The Suining West Hub widening Project from Xuzhou to Mingguang Expressway in Jiangsu Province adopts the special type of single horn hub type. It intersects with the Ningsuxu Expressway to form a T-shaped junction, and there are local splicing, including: directional ramps, One way single lane ramp and two opposite lane ramps. Based on the investigation and preliminary analysis of the existing problems and related treatment techniques in the expressway reconstruction and extension project, the finite element analysis model was established based on the widening project of Suining West Hub, and the influence of different factors on the differential settlement of the widening roadbed was analyzed. The main factors include: widening mode and width, widening the height of embankment, the difference of modulus between new and old subgrade, the consolidation degree of new and old foundation. In order to reduce the differential settlement of the new and old subgrade, the technical measures of cutting slope and step excavation and laying geogrid chamber of the old subgrade are put forward. Through research, analysis and conclusion, it is concluded that by comparing bilateral widening with unilateral widening, bilateral widening is more advantageous, and the height or width of embankment filling is increased. It has great influence on the differential settlement of the new and old subgrade and the horizontal displacement of the slope foot of the roadbed, and the influence of the change of the elastic modulus of the new subgrade on the maximum differential settlement value of the new and old subgrade. Comparing the influence of different consolidation degree between new and old subgrade on the differential settlement and horizontal displacement of the new and old subgrade, it is reasonable for the old subgrade to excavate the steps according to the width of 100cm of 80cm height when the slope of the old subgrade is cut at 1: 1.25. Then a layer of geotechnical compartment is laid at the bottom of the new road foundation and the bottom of the road bed, which can better reduce the differential settlement of the new and old subgrade and improve the stability of the new and old subgrade. Under the condition of uneven settlement of the new and old roadbed, the influence of the width of the old pavement excavation step on the new and old pavement structure is analyzed. The results show that the excavation width of the step is reasonable to 60cm.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1
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