-
摘要: 为使公路路基特长箱涵顶进施工顺利实施, 基于模拟试验模拟涵洞顶进的实际摩擦性状, 将箱涵及周围土分别简化为混凝土模型与土模型, 分析采取减阻措施前后混凝土与混凝土、混凝土与不同含水量的土之间的摩擦系数的变化规律, 利用摩擦系数计算实际箱涵需求的顶进力。发现混凝土与混凝土之间的滑动摩擦系数平均为0.31, 石蜡机油混合物作为混凝土与混凝土滑动减阻材料效果明显, 摩擦系数平均为0.12, 减阻61%, 涵周土体含水量的变化对混凝土与土之间的摩擦系数影响较大, 含水量越大摩擦系数越小。模拟试验结果表明: 实际箱涵顶进时, 须对涵洞轴线周围地质情况进行勘探, 以掌握涵周土体的工程特性, 进而提出合理的减阻技术。Abstract: In order to make oversize box culvert being jacked into highway subgrade smoothly, the actual friction status of box culvert was simulated, box culvert and surrounding soil were simplified for concrete model and soil model respectively, the mutative rules of friction coefficients between concrete and concrete, concrete and soils with different amounts of water were analyzed after and before diminishing fiction resistance, and the pushing force of box culvert was computed according to friction coefficients. It is found that the average coefficient of gliding friction between concretes is 0.31;the mixture of paraffin and engine oil can reduce the friction between concretes obviously, the average friction coefficient is 0.12, and 61% of the previous friction coefficient is reduced; the amount of water in soil body surrounding box culvert greatly influences the friction coefficient between concrete and soil, the bigger the amount of water is, the smaller the friction coefficient is.Simulation result shows that when box culvert is jacked, it is necessary to explore the geological condition surrounding box culvert in order to hold the engineering characteristic of surrounding soil body in hand and give reasonable technology to diminish fiction resistance.
-
Key words:
- road engineering /
- oversize box culvert /
- simulation experiment /
- friction coefficient
-
图 4 不同含水量下各种材料摩擦系数
Figure 4. Friction coefficients of various materials with different water contents
表 1 模型试验总体方案
Table 1. Total scheme of model test
试验内容 模拟类型 混凝土与混凝土 试验模拟涵洞与滑板间的摩阻力性状 混凝土与混凝土表面涂滑石粉 混凝土与混凝土表面涂石蜡机油混合物及滑石粉 土与混凝土 试验模拟涵洞与涵周土体的摩阻力性状 土与混凝土表面涂滑石粉 土与混凝土表面涂油漆 土与混凝土表面涂聚合材料及纳米疏水剂 
下载: 导出CSV
表 2 不同接触面混凝土摩擦系数比较
Table 2. Comparison of friction coefficients of concretes with different touch surfaces
接触面材料 总竖向力/kN 竖向应力/kPa 水平力/kN 剪应力/kPa 摩擦系数 平均摩擦系数 混凝土+混凝土 4.59 22.67 1.50 7.41 0.33 0.31 13.91 68.69 4.60 22.72 0.33 34.55 170.62 10.30 50.86 0.30 54.55 269.38 14.59 72.05 0.27 混凝土+滑石粉+混凝土 12.94 63.90 1.29 6.37 0.10 0.39 29.55 145.93 10.08 49.76 0.34 41.75 206.17 23.05 113.83 0.55 55.08 272.00 30.05 148.40 0.55 混凝土涂3 mm石蜡机油混合物+滑石粉+混凝土 11.17 55.16 1.59 7.85 0.14 0.12 22.77 112.44 2.59 12.79 0.11 32.11 158.57 3.29 16.25 0.10
下载: 导出CSV
表 3 摩擦系数比较
Table 3. Comparison of friction coefficients
含水量/% 混凝土+土 混凝土涂石蜡机油混合物+土 混凝土涂聚合物纳米材料+土 混凝土涂油漆+土 21 0.31 0.15 0.13 0.22 19 0.35 0.23 0.25 0.25 17 0.45 0.27 0.39 0.32 15 0.64 0.29 0.51 0.55 13 0.70 0.24 0.53 0.61
下载: 导出CSV
-
[1] 冯忠居, 谢永利. 大直径钻埋预应力混凝土空心桩承载力的试验[J]. 长安大学学报: 自然科学版, 2005, 25(2): 50-54. doi: 10.3321/j.issn:1671-8879.2005.02.012Feng Zhong-ju, Xie Yong-li. Simulant test of large-diameter bored hollowpile of prestressingforce concrete[J]. Journal of Chang an University: Natural Science Edition, 2005, 25(2): 50-54. (in Chinese) doi: 10.3321/j.issn:1671-8879.2005.02.012 [2] 冯忠居, 张永清, 李晋. 堆载引起桥梁墩台与基础的偏移与防治技术研究[J]. 中国公路学报, 2004, 17(3): 74-77. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200403015.htmFeng Zhong-ju, Zhang Yong-qing, Li Jin. Study of displacement of bridge and abut ment foundation caused by earth piling load and its prevention technique[J]. China Journal of Highway and Transport, 2004, 17(3): 74-77. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200403015.htm [3] TB10203-2002, 铁路桥涵施工技术规范[S]. [4] 夏明耀, 曾进伦. 地下工程设计施工手册[M]. 北京: 中国建筑工业出版社, 1999. [5] 铁道部第四勘测设计院. 桥涵顶进设计与施工[M]. 北京: 中国铁道出版社, 1983. [6] 靳亚顺, 李秋苗. 砂石桩处理软弱地基应用研究[J]. 长安大学学报: 建筑与环境科学版, 2003, 20(3): 22-24. https://www.cnki.com.cn/Article/CJFDTOTAL-XBJG200303007.htmJin Ya-shun, Li Qiu-miao. Research and application of gritstone-pile treatment to soft foundation[J]. Journal of Chang an University: Architecture and Environment Science Edition, 2003, 20(3): 22-24. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XBJG200303007.htm [7] 杜海珍, 荣见华, 傅建林, 等. 基于应变能的结构拓扑优化设计[J]. 交通运输工程学报, 2004, 4(2): 34-37. http://transport.chd.edu.cn/article/id/200403009Du Hai-zhen, Rong Jian-hua, Fu Jian-lin, et al. Structural topology optimization design based on strain energy[J]. Journal of Traffic and Transportation Engineering, 2004, 4(2): 34-37. (in Chinese) http://transport.chd.edu.cn/article/id/200403009 [8] 冯忠居, 谢永利, 李哲, 等. 大直径超长钻孔灌注桩承载性状[J]. 交通运输工程学报, 2005, 5(1): 24-27. http://transport.chd.edu.cn/article/id/200501006Feng Zhong-ju, Xie Yong-li, Li Zhe, et al. Bearing property of large-diameter over-length nonpacment[J]. Journal of Traffic and Transportation Engineering, 2005, 5(1): 24-27. (in Chinese) http://transport.chd.edu.cn/article/id/200501006 [9] 冯忠居, 冯瑞玲, 赵占厂, 等. 黄土湿陷性对桥梁桩基承载力的影响[J]. 交通运输工程学报, 2005, 5(3): 60-63. http://transport.chd.edu.cn/article/id/200503013Feng Zhong-ju, Feng Rui-ling, Zhao Zhan-chang, et al. Effect of collapsibleloess on pile foundation bearing capacity[J]. Journal of Traffic and Transportation Engineering, 2005, 5(3): 60-63. (in Chinese) http://transport.chd.edu.cn/article/id/200503013 [10] 冯忠居, 魏炜. 大直径钻埋预应力空心桩结构承载力计算[J]. 长安大学学报: 自然科学版, 2005, 25(3): 49-53. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200503013.htmFeng Zhong-ju, Wei Wei. Bearing capacity of large diameter bored hollowpile of prestressingforce concrete[J]. Journal of Chang an University: Natural Science Edition, 2005, 25(3): 49-53. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200503013.htm [11] 洪锦祥, 彭大文. 桩基础的整体式桥台桥梁受力性能研究[J]. 中国公路学报, 2002, 15(4): 43-48. doi: 10.3321/j.issn:1001-7372.2002.04.013Hong Jin-xiang, Peng Da-wen. Research on the loaded property of integral abut ment bridges withflexible piles[J]. China Journal of Highway and Transport, 2002, 15(4): 43-48. (in Chinese) doi: 10.3321/j.issn:1001-7372.2002.04.013 [12] 赵明华, 吴鸣, 郭玉荣. 轴、横向荷载下桥梁基桩的受力分析及试验研究[J]. 中国公路学报, 2002, 15(1): 50-54. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200201011.htmZhao Ming-hua, Wu Ming, Guo Yu-rong. Study of the behavior analysis and model test of bridge piles under simultaneous axial and lateral loading[J]. China Journal of Highway and Transport, 2002, 15(1): 50-54. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGGL200201011.htm [13] 宋建军, 陈伟军. 锤击夯扩桩竖向承载力的试验研究[J]. 西北建筑工程学院学报: 自然科学版, 2000, 17(3): 18-20. https://www.cnki.com.cn/Article/CJFDTOTAL-XBJG200003004.htmSong Jian-jun, Chen Wei-jun. The tentative study on vertical load of sinkingtublar and expanded placing pile with hammering[J]. Journal of Northwestern Institute of Architectural Engineering: Natural Sciences, 2000, 17(3): 18-20. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XBJG200003004.htm [14] 于书翰. 黄土地区拱桥桥台人工开挖地下连续墙基础[J]. 西安公路交通大学学报, 2000, 20(4): 32-35. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200004009.htmYu Shu-han. Manual excavated continuous concrete wall of the arch bridge abut ment foundation in the loess region[J]. Journal of Xi an Highway University, 2000, 20(4): 32-35. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200004009.htm [15] 于书翰, 郭成军. 桥梁深基础设计施工一体化[J]. 西安公路交通大学学报, 2001, 21(1): 58-60. https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200101017.htmYu Shu-han, Guo Cheng-jun. Design-construction integrity of bridges deep foundation[J]. Journal of Xi an Highway University, 2001, 21(1): 58-60. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XAGL200101017.htm -
点击查看大图
图(4) / 表(3)
计量
- 文章访问数: 232
- HTML全文浏览量: 94
- PDF下载量: 533
- 被引次数: 0
