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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。
Based on in situ observation and theoretical study, the distribution characteristics and variation of vertical earth pressure on culvert culvert in high fill section are discussed. First of all, carried out a high fill section of the vertical corrugated culvert pressure on-site observation test. The test results show that the soil arching effect exists at the top of the culvert with high fill section. The standard soil column method has large error of earth pressure value, which is conservative. However, the earth pressure value at the top of the pipe culvert is not uniformly distributed with obvious stress Focus area. On this basis, combined with the test law and the Marston theory, the stress concentration caused by the soil arching effect is considered, the vertical earth pressure calculation model of the corrugated culvert with high fill section is established, and the theoretical solution is given, Calculation method of vertical earth pressure on corrugated culvert in fill section. Finally, according to the model, the main influencing factors such as the filling degree of culvert, soil internal friction angle, cohesion and pipe diameter are analyzed. The results show that the soil mass has a significant influence on the vertical soil pressure value of pipe culvert, but the effect of internal friction angle and cohesion is small.