-
摘要: 为了研究高速公路拓宽方式对路基沉降的影响, 结合西潼高速公路改扩建工程, 针对单侧拓宽和双侧对称拓宽方式建立了路基沉降数值模型, 利用有限元方法分析了路基顶面沉降、差异沉降与坡脚水平位移的变化规律, 并选定试验段进行双侧对称拓宽方式下的数值模拟分析和分层总和法计算, 同时进行了路基沉降观测。分析结果表明: 拓宽相同宽度时, 双侧拓宽的旧路基中心沉降减小幅度较单侧拓宽增加15.2%;两侧各拓宽2车道时, 路基差异沉降是单侧拓宽4车道时的24.3%;随着拓宽宽度的增加, 旧路基中心沉降增量逐渐减小, 最大沉降位置在距新建路基边缘内侧3~5m处。数值模拟、分层总和法计算及现场观测最大沉降分别为18.40、18.74、16.06mm, 表明数值模拟方法可靠, 模拟结果与观测结果基本相符。Abstract: In order to research the influence of widening modes on subgrade settlement for expressway, the numerical models of subgrade settlement on the unilateral and bilateral symmetry widening modes of Xitong Expressway were set up, the change rules of top surface settlement, differential settlement and horizontal displacement of slope toe for subgrade were analyzed by using the finite element method, and the comparison result of numerical simulation values, layer-wise summation method's computation values and observation values for subgrade settlement in bilateral symmetry widening mode was analyzed.Analysis result indicates that when the widening widths are same, the decrease amplitude of settlement for old subgrade center in bilateral widening mode is 15.2% larger than the value in unilateral widening mode.The difference of subgrade settlement in widening 2 lanes on both sides is 24.3% of the value in broadening 4 lanes on one side.With the increase of widening width, the center settlement increment of old subgrade decreases gradually, and the displacement of the maximum settlement to the inside of new subgrade edge is 3-5 m.The maximum settlements from numerical simulation, layer-wise summation method and field observation are 18.40、18.74 and 16.06 mm respectively, which indicates that the numerical simulation method is reliable, and the simulation conclusion and the observation result are consistent.
-
Key words:
- expressway /
- widening mode /
- widening width /
- subgrade settlement /
- numerical analysis
-
图 8 单侧拓宽时路基顶面沉降曲线
Figure 8. Settlement curves of subgrade tops in unilateral widening mode
图 10 单侧拓宽时的新旧路基坡脚水平位移
Figure 10. Horizontal displacements of slope toes for new and old subgrades in unilateral widening mode
图 13 双侧拓宽时的路基顶面沉降曲线
Figure 13. Settlement curves of subgrade tops in bilateral widening mode
图 15 双侧拓宽时的新旧路基坡脚水平位移
Figure 15. Horizontal displacements of slope toes for new and old subgrades in bilateral widening mode
表 2 分层总和法沉降计算结果
Table 2. Computation result of settlement with layer-wise summation method
下载: 导出CSV
-
[1] 章定文, 刘松玉. 软土地基高速公路扩建中新老路堤相互作用数值分析[J]. 中国公路学报, 2006, 19(6): 7-12. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200606001.htmZHANG Ding-wen, LIU Song-yu. Numerical analysis of interaction between old and new embankment in widening of freeway on soft ground[J]. China Journal of Highway and Transport, 2006, 19(6): 7-12. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200606001.htm [2] 高翔, 刘松玉, 石名磊. 软土地基上高速公路路基扩建加宽中的关键问题[J]. 公路交通科技, 2004, 21(2): 29-33. https://www.cnki.com.cn/Article/CJFDTOTAL-GLJK200402008.htmGAO Xiang, LIU Song-yu, SHI Ming-lei. Key problems in embankment widening of expressway on soft ground[J]. Journal of Highway and Transportation Research and Devel-opment, 2004, 21(2): 29-33. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-GLJK200402008.htm [3] 钱劲松. 新老路基不协调变形及控制技术研究[D]. 上海: 同济大学, 2004.QIAN Jin-song. Study on the uncoordinated deformation and control technology of old and new subgrade[D]. Shanghai: Tongji University, 2004. (in Chinese). [4] 贾宁. 软土地基高速公路拓宽的沉降性状及处理研究[D]. 杭州: 浙江大学, 2004.JIA Ning. Research on settlement behavior of highway wide-ning on soft soils and improvement methods[D]. Hangzhou: Zhejiang University, 2004. (in Chinese). [5] 贾宁, 陈仁朋, 陈云敏, 等. 杭甬高速公路拓宽工程理论分析及监测[J]. 岩土工程学报, 2004, 26(6): 755-760. doi: 10.3321/j.issn:1000-4548.2004.06.006JIA Ning, CHEN Ren-peng, CHEN Yun-min, et al. Theoretical analysis and measurement for widening project of Hang-yong Expressway[J]. Chinese Journal of Geotechnical Engin-eering, 2004, 26(6): 755-760. (in Chinese). doi: 10.3321/j.issn:1000-4548.2004.06.006 [6] 孙伟, 龚晓南, 孙东. 高速公路拓宽工程变形性状分析[J]. 中南公路工程, 2004, 29(4): 53-55. https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGL200404014.htmSUN Wei, GONG Xiao-nan, SUN Dong. Analysis of deformation in widening project of freeway[J]. Central South Highway Engineering, 2004, 29(4): 53-55. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-ZNGL200404014.htm [7] 王东耀, 折学森, 叶万军, 等. 高速公路软基最终沉降预测的范例推理方法[J]. 长安大学学报: 自然科学版, 2006, 26(1): 20-23, 42. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200601004.htmWANG Dong-yao, SHE Xue-sen, YE Wan-jun, et al. Case-based reasoning approach to settlement of expressway on soft foundation[J]. Journal of Chang'an University: Natural Science Edition, 2006, 26(1): 20-23, 42. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200601004.htm [8] 傅珍, 王选仓, 李宏志, 等. 高速公路拓宽路基差异沉降[J]. 交通运输工程学报, 2010, 10(6): 25-31. http://transport.chd.edu.cn/article/id/201006005FU Zhen, WANG Xuan-cang, LI Hong-zhi, et al. Differential settlement of widening subgrade for expressway[J]. Journal of Traffic and Transportation Engineering, 2010, 10(6): 25-31. (in Chinese). http://transport.chd.edu.cn/article/id/201006005 [9] 孟庆山, 孔令伟, 郭爱国, 等. 高速公路高填方路堤拼接离心模型试验研究[J]. 岩石力学与工程学报, 2007, 26(3): 580-586. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200703019.htmMENG Qing-shan, KONG Ling-wei, GUO Ai-guo, et al. Centrifugal modeling test study on high-embankment widening of highway[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(3): 580-586. (in Chinese). https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200703019.htm [10] 丁锟. 潼宝高速公路改扩建新旧路基差异沉降数值模拟分析[D]. 西安: 长安大学, 2009.DING Kun. Numerical simulation and analysis of differential settlement in Tongbao Expressway widening project[D]. Xi'an: Chang'an University, 2009. (in Chinese). [11] 赵刘会. 高速公路改扩建新老路基差异变形影响因素及拓宽路基施工技术研究[D]. 西安: 长安大学, 2008.ZHAO Liu-hui. Research on the contrast deformation between new and existing embankment and construst technique in subgrade of the highway[D]. Xi'an: Chang'an University, 2008. (in Chinese). [12] MIKI H, NOZU M. Design and numerical analysis of road embankment with low improvement ratio deep mixing method[C]//ASCE. Proceedings of GeoTrans 2004: Geotechnical Engineering for Transportation Projects(GSP 126). Reston: ASCE, 2004: 1395-1402. -
点击查看大图
图(17) / 表(3)
计量
- 文章访问数: 894
- HTML全文浏览量: 304
- PDF下载量: 866
- 被引次数: 0
