An analysis of active earth pressure of cohesive soil based on the layering of principal stress traces
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摘要:
墙背粗糙导致墙后土体应力方向发生偏转，目前，黏性土中考虑土体应力方向偏转对土压力影响的研究较少。为此，本文首先在探讨墙后土体主应力偏转规律的基础上，采用沿主应力迹线分层形成曲线薄层单元。然后，通过分析曲线薄层单元的受力情况，建立曲线薄层单元的静力平衡方程，推导出平动模式下黏性土体土压力沿墙高分布的公式，进而获得黏性土土压力分析新方法。最后，将本文方法与实测结果和现有理论进行对比验证和参数分析，验证本文方法的可靠性和合理性。研究结果表明：考虑墙土摩擦效应的计算结果更能准确反映黏性土体土压力沿墙高的分布规律；土压力大小随黏聚力增大而减小；随着墙土摩擦角的增大，土压力合力逐渐减小，作用点高度缓慢升高。
Abstract:The rough back of a wall causes the deflection of the soil stress direction behind the wall. At present, there are few studies on the influence of the deflection of the soil stress direction on the earth pressure in cohesive soils. For this reason, this paper firstly discusses the deflection law of the principal stress of the soil behind the wall, and adopts a layered formation of curved thin-layer elements along the principal stress trace. By analyzing the force of the curved thin-layer element, the static balance equation of the curved thin-layer element is established, and the formula for the distribution of the earth pressure of the cohesive soil along the wall height in the translational mode is derived, and the new analysis method of the cohesive earth pressure is obtained. Finally, the method in this paper is compared with the actual measurement results and the existing theory and the parameters are analyzed to verify the reliability and rationality of the method in this paper. The research results show that the calculation results considering the effect of wall-soil friction can more accurately reflect the distribution law of cohesive soil along the wall height; the magnitude of earth pressure decreases with the increasing cohesion. With the increase of wall-soil friction angle soil, the pressure resultant force gradually decreases, and the height of the point of application increases slowly.
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Key words:
- retaining wall /
- cohesive soil /
- active earth pressure /
- soil arching effect /
- principal stress traces
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