| 矩形沟埋涵洞顶部垂直土压力试验和理论研究 |
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| 引用本文： | 李永刚,张善元.矩形沟埋涵洞顶部垂直土压力试验和理论研究[J].岩土力学,2008,29(4):1081-1086. |
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| 作者姓名： | 李永刚 张善元 |
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| 作者单位： | 太原理工大学,建筑与土木工程学院,太原,030024 |
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| 摘 要： | 针对无黏性填土，通过模型试验和理论分析的方法研究矩形沟埋刚性涵洞顶部的垂直土压力。考虑胸腔土体的作用，建立了沟埋涵洞土压力的计算模型和计算公式，结果表明，计算值与试验值相吻合。沟槽宽度等于涵洞外径时，洞顶土压力系数随填土高度的增大呈单调减小的变化规律；沟槽宽度大于涵洞外径时，洞顶土压力系数随填土高度的增大呈先增后减的变化规律；洞顶填土厚度等于初始等沉面高度时，土压力系数最大。槽洞宽比加大时，土压力系数、等沉面高度按双曲线规律增大，7倍洞径的沟槽宽度近似为沟埋式涵洞和上埋式涵洞的临界槽宽。填土内摩角增大时，土压力系数增大。洞顶填土厚度增大，等沉面高度减小。
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| 关 键 词： | 矩形沟埋涵洞 土压力 模型试验 等沉面 计算公式 |
| 文章编号： | 1000-7598-(2008)04-1081-06 |
| 收稿时间： | 2006-04-12 |
| 修稿时间： | 2006年4月12日 |
Experinental and theoretical study on earth pressure on top of rectangular trench-buried culVerts |
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| LI Yong-gang,zHANG Shan-yuan.Experinental and theoretical study on earth pressure on top of rectangular trench-buried culVerts[J].Rock and Soil Mechanics,2008,29(4):1081-1086. |
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| Authors: | LI Yong-gang zHANG Shan-yuan |
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| Institution: | Taiyuan University of technology, Taiyuan 030024, China |
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| Abstract: | The vertical earth pressure on the top of rectangular trench-buried culverts is analyzed experimentally and theoretically under the condition of non-cohesive soil. Taking account of effect of the soil masses beside culverts, a new model and formulation for calculating the earth pressure is proposed. The calculated results agreed with the experimental results. The results show that the coefficient of earth pressure decreases monotonously with the increases of the depth of soil overlying culverts if trench width equals to the outer diameter of the culverts; and the coefficient increases first and decreases afterwards if trench width exceeds the outer diameter of the culverts; the coefficient is the maximum as the depth of burial becomes the height of the initial plane of equal settlement. The coefficient and the height of the plane of equal settlement increase in hyperbola with increasing ratio of trench width to culvert width. The trench width that is 7 times the diameter of the culverts is approximately the critical width between trench-buried culverts and positive-buried culverts. The coefficient increases with the increasing angle of internal friction of the soil. The height of plane of equal settlement decreases as the depth of soil overlying culverts increases. The height of plane of equal settlement decreases as the depth of soil overlying culverts increases. |
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| Keywords: | rectangular trench-buried culverts earth pressure model experiment plane of equal settlement formula |
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