| 双参数地基上土钉墙面层土压力计算 |
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| 引用本文： | 王立峰,祝江鸿.双参数地基上土钉墙面层土压力计算[J].科技通报,2012,28(3):94-99. |
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| 作者姓名： | 王立峰 祝江鸿 |
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| 作者单位： | 浙江科技学院土木系,杭州,310023 |
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| 基金项目： | 浙江省科技计划资助项目(项目编号:2010C31061) |
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| 摘 要： | 土钉墙面层承受部分土(水)压力,文中把土钉墙面层看作是弹性地基上的有限长梁,在试验的基础上,推导了基于双参数地基的成层土层分布的土钉墙面层在土钉拉力作用下的挠曲线、转角、弯矩和剪力方程,并与实测数据进行了比较分析,验证了模型的合理性,得到的解析解基本上可以反映土钉墙面层土压力的分布.在此基础上,探讨了不同土性土层中土钉墙面层土压力的分布.面层土压力在土层的分界面上位移连续土压力突变；作用在软弱土层的面层土压力比硬土层上的面层土压力大；上软下硬型较上硬下软的土层分布更能使面层土压力得到充分发挥;同时文中计算了面层土压力换算成荷载与土钉拉力的比值,面层对于土压力的作用随着深度的增加表现得愈加明显,提出针对不同地区不同深度和不同土性条件下应给出比值的建议值,以使土钉墙的设计更符合其真实的作用机理.文中得到的结论和计算方法对于进一步研究土钉墙的作用机理及设计中如何充分发挥面层的作用等具有重要的理论意义和实际应用价值.
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| 关 键 词： | 土钉墙 弹性地基梁 面层 双参数地基 土压力 |
Analysis of Facing Earth Pressure of Soil-nailing Wall on Double-parameter Foundation |
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| WANG Lifeng
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ZHU Jianghong.Analysis of Facing Earth Pressure of Soil-nailing Wall on Double-parameter Foundation[J].Bulletin of Science and Technology,2012,28(3):94-99. |
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| Authors: | WANG Lifeng ZHU Jianghong |
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| Institution: | (Department of Civil Engineering of Zhejiang University of Science and Technology,Hangzhou,310023,China) |
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| Abstract: | Present designers of soil-nailing walls consider the facing as accessory structure rather than the main one.However It is absolutely sure that the facing bear against water and earth pressure.Facing isolated and considered as finite beam on elastic foundation simply,solutions of displacement 、angles of rotation、bending moment and shear force of soil-nailing walls are gained on basis of field tests in layered soil.Rationality of the model is tested and verified.The results that can disclose laws of distribution of facing earth pressure are in agreement with the actual measurement datum.Earth pressure in bounding surface shows abrupt changes while displacement of facing exhibits continuous characteristics.Earth pressure of facing applied by soft soil presents bigger values than that of hard soil.Earth pressure in"upper soft and lower hard layers"can be easily gained than that of "lower soft and upper hard layers"soils.The laws of facing earth pressure in various soil layers are studied that the curves of earth pressure in good layers such as sand soil and hard plastic clay have characteristics of zigzag shape rather than smooth one in bad soil layers of silt soil and soft plastic clay.At the meantime ratios of earth pressure to nail tension are calculated,and effects of facing upon earth pressure become clearer and clear with depth of pit excavation.In order to meet the necessity of mechanics of soil-nailing walls,rations of facing earth pressure to nail tension in various soil layers and depth should be put forward for references.The results and the method of calculating above ratios based on precise Elasticity Theory are very significant and engineering use value for further research of mechanics of soil-nailing walls and for designers considering the facing action against earth pressure. |
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| Keywords: | soil-nailing wall beams on elastic foundation facing double-parameter foundation earth pressure |
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