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高填方段波纹管涵垂直土压力试验及计算

, PP. 33-38

Keywords: 道路工程,波纹管涵,现场试验,土拱效应,垂直土压力

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Abstract:

基于原位观测试验与理论研究,对高填方段波纹管涵的涵顶垂直土压力的分布特征与变化规律进行了探讨。首先,开展了高填方段波纹管涵垂直土压力现场观测试验。试验结果表明,高填方段管涵顶部存在土拱效应,规范的土柱法计算土压力值误差较大,偏于保守,而管涵顶部平面的土压力值并非均匀分布,存在明显的应力集中区域。在此基础上,结合试验规律及马斯顿理论,考虑由于土拱效应造成的应力集中现象,建立了高填方段波纹管涵垂直土压力计算模型,并进行了理论求解,从而提出了高填方段波纹管涵垂直土压力计算方法。最后,依据此模型对涵顶填土重度、土体内摩擦角、黏聚力、管径大小等主要影响因素进行了参数分析。结果表明,土体重度对管涵垂直土压力数值影响较大,而内摩擦角及黏聚力的影响较小。

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