桩板式挡土墙桩间挡土板土压力计算方法研究
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摘要
作为一种新型边坡支挡结构,桩板式挡土墙已被广泛应用于路堑、路堤以及滑坡等特殊支挡工程之中,但目前对作用于桩间挡土板上土压力的研究仍严重滞后于工程实践。为合理确定桩间挡土板上的土压力,借助桩板式挡土墙桩-板后土体土拱合理拱轴线的假定建立了相应的土拱计算模型,并假定拱后滑坡推力为均布荷载,基于土拱静力平衡条件及桩-板后土拱处于极限平衡状态,进而根据莫尔-库伦强度理论确定土拱竖向应力,藉此推导出考虑滑坡推力作用的桩间挡土板土压力计算公式。并将其与传统方法(卸荷拱法和拟化筒仓法)进行了对比分析,结果表明:本文方法更能反映作用于桩间挡土板上实际土压力的大小,且可考虑来自桩-板后土体传递而来滑坡推力的作用,其中传统方法仅是本文方法的一种特殊形式;桩间挡土板上的土压力随桩-板后土体粘聚力和内摩擦角增大而大致呈线性递减,并随拱后滑坡推力和桩跨比的增大而增大。研究成果可为桩板式挡土墙的合理设计提供参考。
As a new type of slope retaining structure, pile-sheet retaining wall is widely used in the cutting slope, embankment engineering and landslide treatment, however, the study of earth pressure on retaining wall slab still lags behind. In order to reasonably determine the earth pressure acting on the retaining wall slab, this paper establishes a soil arching calculation model based on the assumption of the reasonable arch axis of the pile-sheet retaining wall behind the pile arch, and the landslide thrust of the arch rear slope was assumed to be uniformly distributed. Then, based on the static balance conditions of the soil arches and the soil arching is in the limit equilibrium, the vertical stress of soil arching is determined based on the Mohr-Coulomb strength criterion, the calculation formula of earth pressure acting on retaining wall slab of pile-sheet retaining wall considering landslide thrust is deduced. Compared with the traditional method(unloading-arch theory and simplified granary method), the results show that this method can better reflect the actual earth pressure acting on the pile-retaining wall, and can consider the role of landslide thrust. Meanwhile, the traditional methods are just a special form of this method. The earth pressure on the retaining wall decreases linearly with the increases of the cohesion and internal friction angle of the soil. and increases with the thrust of the rear landslide and l/B of the pile-sheet retaining wall. The research results can provide reference for the reasonable design of pile-sheet retaining wall.
As a new type of slope retaining structure, pile-sheet retaining wall is widely used in the cutting slope, embankment engineering and landslide treatment, however, the study of earth pressure on retaining wall slab still lags behind. In order to reasonably determine the earth pressure acting on the retaining wall slab, this paper establishes a soil arching calculation model based on the assumption of the reasonable arch axis of the pile-sheet retaining wall behind the pile arch, and the landslide thrust of the arch rear slope was assumed to be uniformly distributed. Then, based on the static balance conditions of the soil arches and the soil arching is in the limit equilibrium, the vertical stress of soil arching is determined based on the Mohr-Coulomb strength criterion, the calculation formula of earth pressure acting on retaining wall slab of pile-sheet retaining wall considering landslide thrust is deduced. Compared with the traditional method(unloading-arch theory and simplified granary method), the results show that this method can better reflect the actual earth pressure acting on the pile-retaining wall, and can consider the role of landslide thrust. Meanwhile, the traditional methods are just a special form of this method. The earth pressure on the retaining wall decreases linearly with the increases of the cohesion and internal friction angle of the soil. and increases with the thrust of the rear landslide and l/B of the pile-sheet retaining wall. The research results can provide reference for the reasonable design of pile-sheet retaining wall.
引文
[1] 刘力生, 吴曙光. 基于土拱效应的悬臂式抗滑桩桩间挡板土压力计算[J]. 岩土工程学报, 2015, 37(7): 153-157.LIU Lisheng, WU Shuguang. Calculation of earth pressure on baffle of cantilever anti-slide piles based on soil arching effects[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(7): 153-157. (in Chinese)
[2] 董捷, 张永兴, 黄治云. 柔性板桩板墙加固斜坡填方地基的土压力分配问题研究[J]. 岩土力学, 2010, 31(8): 2489-2506.DONG Jie, ZHANG Yongxing, HUANG Zhiyun. Study on earth pressure distribution of flexiboard sheet-pile walls used in reinforced fill foundation on ramp[J]. Rock and Soil Mechanics, 2010, 31(8): 2489-2506. (in Chinese)
[3] 黄治云, 张永兴, 董捷. 桩板墙土拱效应及土压力传递特性试验研究[J]. 岩土力学, 2013, 34(7): 1887-1892.HUANG Zhiyun, ZHANG Yongxing, DONG Jie. Experimental study of soil arching and transfer behavior of earth pressure about sheet-pile walls[J]. Rock and Soil Mechanics, 2013, 34(7): 1887-1892. (in Chinese)
[4] 商秋婷, 刘祚秋, 林治平. 悬臂式挡土板对桩板后土拱效应的影响[J]. 地下空间与工程学报, 2014, 10(2): 333-339.SHANG Qiuting, LIU Zuoqiu, LIN Zhiping. Influence of breast board of cantilever piles on soil arching effect behind piles and plane[J]. Chinese Journal of Underground Space and Engineering, 2014, 10(2): 333-339. (in Chinese)
[5] 叶晓明. 柱板结构挡土墙板上的土压力计算方法[J]. 地下空间与工程学报, 1999, 19(2): 142-146.YE Xiaoming. The calculation method of earth pressure on the wall board of column plate structure[J]. Chinese Journal of Underground Space and Engineering, 1999, 19(2): 142-146. (in Chinese)
[6] DB50/5029—2004地质灾害防治工程设计规范[S]. 2004.DB50/5029—2004 Code for Design of Geological Disaster Prevention Project[S]. 2004. (in Chinese)
[7] 黄治云. 抗滑桩桩间拱效应与桩板土压力研究[D]. 重庆: 重庆大学, 2014.HUANG Zhiyun. Research of arch effect between anti-slide piles and soil pressure on pile sheet[D]. Chongqing University, 2014. (in Chinese)
[8] 韩同春, 邱子义, 豆红强. 基于颗粒离散元的抗滑桩土拱效应分析[J]. 中南大学学报, 2016, 47(8): 2715-2722.HAN Tongchun, QIU Ziyi, DOU Hongqiang. Soil arching effect between anti-slide piles based on YADE discrete element method[J]. Journal of Central South University, 2016, 47(8): 2715-2722. (in Chinese)
[9] 王成华, 陈永波, 林立相. 抗滑桩间土拱力学特性与最大桩间距分析[J]. 山地学报, 2001, 19(6): 556-559.WANG Chenghua, CHEN Yongbo, LIN Lixiang. Analysis of mechanical characteristics and maximum pile spacing of soil arches between anti-slide piles[J]. Journal of Mountain Science, 2001, 19(6): 556-559. (in Chinese)
[10] Handy R L. The Arch in Soil Arching[J]. Journal of Geotechnical Engineering, ASCE, 1985, 3(3): 302-318.
[11] Kingsleyhafrop-williams, 陈文. 土拱中的拱形[J]. 路基工程, 1990(6): 85-88.Kingsleyhafrop-williams, CHEN Wen. Arches in soil arches[J]. Subgrade Engineering, 1990(6): 85-88. (in Chinese)
[12] 贾海莉, 王成华, 李江洪. 关于土拱效应的几个问题[J]. 西南交通大学学报, 2003, 38(4): 398-402.JIA Haili, WANG Chenghua, LI Jianghong. Discussion on some issues in theory of soil arch[J]. Journal of Southwest Jiaotong University, 2003, 38(4): 398-402. (in Chinese)
[13] 章玲玲, 林海. 基于土拱效应的桩板码头遮帘桩间距的设计计算[J]. 岩土工程学报, 2013, 35(2): 1134-1137.ZHANG Lingling, LIN Hai. Design calculation on spacing of barrier piles for sheet-pile wharf based on soil-arching effect[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(2): 1134-1137. (in Chinese)
[14] 胡敏云. 深基坑护壁桩间距确定方法探讨[J]. 中国公路学报, 2001, 14(2): 27-29.HU Minyun. Estimation of the spacing between retaining piles for excavation[J]. China Journal of Highway and Transport, 2001, 14(2): 27-29. (in Chinese)
[15] 惠炜, 吴跃东, 赵颖慧. 基于土拱效应的遮帘桩合理桩间距分析[J]. 长江科学院院报, 2015, 32(12): 67-71.HUI Wei, WU Yuedong, ZHAO Yinghui. Analysis of reasonable pile spacing of curtain pile based on soil arching effect[J]. Journal of Yangtze River Scientific Research Institute, 2015, 32(12): 67-71. (in Chinese)
[16] 肖世国, 程富强. 再论悬臂式抗滑桩合理桩间距的计算方法[J]. 岩土力学, 2015, 36(1): 111-116.XIAO Shiguo, CHENG Fuqiang. Further discussion on the calculation method of rational spacing between two adjacet cantilever piles for stabilizing slope[J]. Rock and Soil Mechanics, 2015, 36(1): 111-116. (in Chinese)
[17] 常连远. 基于土拱效应的抗滑桩桩间挡土板上土压力研究[D]. 西安: 西安科技大学, 2016.CHANG Lianyuan. Study of earth pressure on retaining wall between anti-slide pile based on soil arching effect[D]. Xi’an: Xi’an University of Science and Technology, 2016. (in Chinese)
[18] 戴自航. 抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J]. 岩石力学与工程学报, 2002, 21(4): 517-521.DAI Zihang. Study on the distribution of the landslide thrust and the resistance of the front sliding body of the anti-slide pile[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(4): 517-521. (in Chinese)
[19] 陈福全, 侯永峰, 刘毓氚, 等. 考虑桩土侧移的被动桩中土拱效应数值分析[J]. 岩土力学, 2007, 28(7): 1333-1337.CHEN Fuquan, HOU Yongfeng, LIU Yuchuan, et al. Numerical analysis of soil arching effects in displaced passive piles considering lateral soil movements[J]. Rock and Soil Mechanics, 2007, 28(7): 1333-1337. (in Chinese)
[20] 张建勋, 陈福全, 简洪钰. 被动桩中土拱效应问题的数值分析[J]. 岩土力学, 2004, 25(2): 174-178,184.ZHANG Jianxun, CHEN Fuquan, JIAN Hongyu. Numerical analysis of soil arching effects in passive piles[J]. Rock and Soil Mechanics, 2004, 25(2): 174-178. (in Chinese)
[21] 向先超, 张华, 蒋国盛, 等. 基于颗粒流的抗滑桩土拱效应研究[J]. 岩土工程学报, 2011, 33(3): 386-391. XIANG Xianchao, ZHANG Hua, JIANG Guosheng, et al. Soil arching effect of anti-slide piles based on particle flow method[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(3): 386-391. (in Chinese)
[22] 秦磊, 李宏全, 秦伟航, 等. 单排抗滑桩桩间距对土拱效应影响的数值分析[J]. 公路交通科技, 2014(7): 99-101.QIN Lei, LIHongquan, QIN Weihang, et al. Numerical analysis of the influence of single row anti slide piles spacing on soil arching effect[J]. Journal of Highway and Transportation Research and Development, 2014(7): 99-101. (in Chinese)
[2] 董捷, 张永兴, 黄治云. 柔性板桩板墙加固斜坡填方地基的土压力分配问题研究[J]. 岩土力学, 2010, 31(8): 2489-2506.DONG Jie, ZHANG Yongxing, HUANG Zhiyun. Study on earth pressure distribution of flexiboard sheet-pile walls used in reinforced fill foundation on ramp[J]. Rock and Soil Mechanics, 2010, 31(8): 2489-2506. (in Chinese)
[3] 黄治云, 张永兴, 董捷. 桩板墙土拱效应及土压力传递特性试验研究[J]. 岩土力学, 2013, 34(7): 1887-1892.HUANG Zhiyun, ZHANG Yongxing, DONG Jie. Experimental study of soil arching and transfer behavior of earth pressure about sheet-pile walls[J]. Rock and Soil Mechanics, 2013, 34(7): 1887-1892. (in Chinese)
[4] 商秋婷, 刘祚秋, 林治平. 悬臂式挡土板对桩板后土拱效应的影响[J]. 地下空间与工程学报, 2014, 10(2): 333-339.SHANG Qiuting, LIU Zuoqiu, LIN Zhiping. Influence of breast board of cantilever piles on soil arching effect behind piles and plane[J]. Chinese Journal of Underground Space and Engineering, 2014, 10(2): 333-339. (in Chinese)
[5] 叶晓明. 柱板结构挡土墙板上的土压力计算方法[J]. 地下空间与工程学报, 1999, 19(2): 142-146.YE Xiaoming. The calculation method of earth pressure on the wall board of column plate structure[J]. Chinese Journal of Underground Space and Engineering, 1999, 19(2): 142-146. (in Chinese)
[6] DB50/5029—2004地质灾害防治工程设计规范[S]. 2004.DB50/5029—2004 Code for Design of Geological Disaster Prevention Project[S]. 2004. (in Chinese)
[7] 黄治云. 抗滑桩桩间拱效应与桩板土压力研究[D]. 重庆: 重庆大学, 2014.HUANG Zhiyun. Research of arch effect between anti-slide piles and soil pressure on pile sheet[D]. Chongqing University, 2014. (in Chinese)
[8] 韩同春, 邱子义, 豆红强. 基于颗粒离散元的抗滑桩土拱效应分析[J]. 中南大学学报, 2016, 47(8): 2715-2722.HAN Tongchun, QIU Ziyi, DOU Hongqiang. Soil arching effect between anti-slide piles based on YADE discrete element method[J]. Journal of Central South University, 2016, 47(8): 2715-2722. (in Chinese)
[9] 王成华, 陈永波, 林立相. 抗滑桩间土拱力学特性与最大桩间距分析[J]. 山地学报, 2001, 19(6): 556-559.WANG Chenghua, CHEN Yongbo, LIN Lixiang. Analysis of mechanical characteristics and maximum pile spacing of soil arches between anti-slide piles[J]. Journal of Mountain Science, 2001, 19(6): 556-559. (in Chinese)
[10] Handy R L. The Arch in Soil Arching[J]. Journal of Geotechnical Engineering, ASCE, 1985, 3(3): 302-318.
[11] Kingsleyhafrop-williams, 陈文. 土拱中的拱形[J]. 路基工程, 1990(6): 85-88.Kingsleyhafrop-williams, CHEN Wen. Arches in soil arches[J]. Subgrade Engineering, 1990(6): 85-88. (in Chinese)
[12] 贾海莉, 王成华, 李江洪. 关于土拱效应的几个问题[J]. 西南交通大学学报, 2003, 38(4): 398-402.JIA Haili, WANG Chenghua, LI Jianghong. Discussion on some issues in theory of soil arch[J]. Journal of Southwest Jiaotong University, 2003, 38(4): 398-402. (in Chinese)
[13] 章玲玲, 林海. 基于土拱效应的桩板码头遮帘桩间距的设计计算[J]. 岩土工程学报, 2013, 35(2): 1134-1137.ZHANG Lingling, LIN Hai. Design calculation on spacing of barrier piles for sheet-pile wharf based on soil-arching effect[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(2): 1134-1137. (in Chinese)
[14] 胡敏云. 深基坑护壁桩间距确定方法探讨[J]. 中国公路学报, 2001, 14(2): 27-29.HU Minyun. Estimation of the spacing between retaining piles for excavation[J]. China Journal of Highway and Transport, 2001, 14(2): 27-29. (in Chinese)
[15] 惠炜, 吴跃东, 赵颖慧. 基于土拱效应的遮帘桩合理桩间距分析[J]. 长江科学院院报, 2015, 32(12): 67-71.HUI Wei, WU Yuedong, ZHAO Yinghui. Analysis of reasonable pile spacing of curtain pile based on soil arching effect[J]. Journal of Yangtze River Scientific Research Institute, 2015, 32(12): 67-71. (in Chinese)
[16] 肖世国, 程富强. 再论悬臂式抗滑桩合理桩间距的计算方法[J]. 岩土力学, 2015, 36(1): 111-116.XIAO Shiguo, CHENG Fuqiang. Further discussion on the calculation method of rational spacing between two adjacet cantilever piles for stabilizing slope[J]. Rock and Soil Mechanics, 2015, 36(1): 111-116. (in Chinese)
[17] 常连远. 基于土拱效应的抗滑桩桩间挡土板上土压力研究[D]. 西安: 西安科技大学, 2016.CHANG Lianyuan. Study of earth pressure on retaining wall between anti-slide pile based on soil arching effect[D]. Xi’an: Xi’an University of Science and Technology, 2016. (in Chinese)
[18] 戴自航. 抗滑桩滑坡推力和桩前滑体抗力分布规律的研究[J]. 岩石力学与工程学报, 2002, 21(4): 517-521.DAI Zihang. Study on the distribution of the landslide thrust and the resistance of the front sliding body of the anti-slide pile[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(4): 517-521. (in Chinese)
[19] 陈福全, 侯永峰, 刘毓氚, 等. 考虑桩土侧移的被动桩中土拱效应数值分析[J]. 岩土力学, 2007, 28(7): 1333-1337.CHEN Fuquan, HOU Yongfeng, LIU Yuchuan, et al. Numerical analysis of soil arching effects in displaced passive piles considering lateral soil movements[J]. Rock and Soil Mechanics, 2007, 28(7): 1333-1337. (in Chinese)
[20] 张建勋, 陈福全, 简洪钰. 被动桩中土拱效应问题的数值分析[J]. 岩土力学, 2004, 25(2): 174-178,184.ZHANG Jianxun, CHEN Fuquan, JIAN Hongyu. Numerical analysis of soil arching effects in passive piles[J]. Rock and Soil Mechanics, 2004, 25(2): 174-178. (in Chinese)
[21] 向先超, 张华, 蒋国盛, 等. 基于颗粒流的抗滑桩土拱效应研究[J]. 岩土工程学报, 2011, 33(3): 386-391. XIANG Xianchao, ZHANG Hua, JIANG Guosheng, et al. Soil arching effect of anti-slide piles based on particle flow method[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(3): 386-391. (in Chinese)
[22] 秦磊, 李宏全, 秦伟航, 等. 单排抗滑桩桩间距对土拱效应影响的数值分析[J]. 公路交通科技, 2014(7): 99-101.QIN Lei, LIHongquan, QIN Weihang, et al. Numerical analysis of the influence of single row anti slide piles spacing on soil arching effect[J]. Journal of Highway and Transportation Research and Development, 2014(7): 99-101. (in Chinese)
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