| 减载条件下高填方涵洞受力机制及基底压力 |
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| 引用本文： | 张业勤,陈保国,孟庆达,徐昕.减载条件下高填方涵洞受力机制及基底压力[J].岩土力学,2019,40(12):4813-4818. |
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| 作者姓名： | 张业勤 陈保国 孟庆达 徐昕 |
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| 作者单位： | 1. 中国地质大学（武汉）工程学院，湖北 武汉 430074；2. 中国水利水电第七工程局有限公司，四川 成都 610081 |
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| 基金项目： | 国家自然科学基金（No.41602319，No.51108434） |
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| 摘 要： | 针对现有的理论方法主要关注涵顶土压力而未能考虑涵洞侧墙摩擦阻力对高填方涵洞结构受力状态的影响，提出了完整的减载条件下涵?土作用机制模型，推得涵洞侧墙摩擦力及基底压力的计算式。并将该理论方法的计算结果与数值模拟结果进行了比对，验证了该理论方法的正确性。研究结果表明，侧墙摩擦力沿墙身深度近似呈线性增加，并随填土高度的增加而增大；相同填土高度时，减载条件下的侧墙摩擦力大于非减载条件下侧墙摩擦力；采用减载措施虽然降低了涵顶垂直土压力，但是增大了涵测水平土压力，基底压力并未减小，现有的减载理论方法中不考虑侧墙摩擦力的影响是不合理的。
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| 关 键 词： | 高填方涵洞 减载 摩擦力 土压力 基底压力 |
| 收稿时间： | 2018-12-19 |
Stress mechanism and foundation contact pressure of high fill culvert under load reduction condition |
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| ZHANG Ye-qin,CHEN Bao-guo,MENG Qing-da,XU Xin.Stress mechanism and foundation contact pressure of high fill culvert under load reduction condition[J].Rock and Soil Mechanics,2019,40(12):4813-4818. |
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| Authors: | ZHANG Ye-qin CHEN Bao-guo MENG Qing-da XU Xin |
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| Institution: | 1. Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, China; 2. Sinohydro Bureau 7 Co. Ltd., Chengdu, Sichuan 610081, China |
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| Abstract: | The present theoretical analyses about high fill culverts structure stress state mainly focus on the earth pressure acting on the top of culverts, but do not consider the effect of the skin friction between the culvert side walls and the adjacent backfill. In this paper, a mechanical model of culvert-soil under load reduction condition was proposed and formulas for calculating the side wall friction and the foundation contact pressure were also deduced. The theoretical method was compared and calibrated with the numerical simulation. Results show that the soil-side wall friction linearly increases with the depth of the culvert side wall and the increase of fill height. The soil-side wall friction under the load reduction condition is greater than that under the non-load reduction condition at a certain fill height. Although the vertical earth pressure on the top of the culvert is reduced due to the load reduction measure, the horizontal earth pressure on the side of the culvert is increased, as a result, the base pressure is not reduced. It is unreasonable to analyze the culvert performance under load reduction condition without considering the effect of the friction acting on the culvert side wall in present theories. |
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| Keywords: | high fill culvert load reduction friction earth pressure foundation contact pressure |
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