| 引用本文: | 黄睿,夏唐代.无粘性土的地震主动土压力水平层法改进[J].哈尔滨工业大学学报,2014,46(2):85.DOI:10.11918/j.issn.0367-6234.2014.02.016 |
| HUANG Rui,XIA Tangdai.Improved horizontal slice method for seismic active earth pressure of cohesionless soil[J].Journal of Harbin Institute of Technology,2014,46(2):85.DOI:10.11918/j.issn.0367-6234.2014.02.016 |
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| 摘要: |
| 为了研究主应力偏转对土压力的影响,基于拟静力法,考虑平移模式下挡土墙墙后土体的主应力偏转和土层间的水平剪力,改进水平层分析法,根据应力状态和静力平衡条件建立基本方程组,通过迭代搜索程序进行求解,计算得出滑裂面形状、地震主动土压力分布、土压力系数和合力作用点,并对其进行参数讨论．结果表明:对于无粘性土,搜索得到的滑裂面曲线形状近似直线,故简化计算时,采用平面滑裂面的假设比较合理;填土内摩擦角和水平地震作用对土压力分布的影响较大,墙土摩擦角和竖向地震作用影响相对较小．与传统拟静力法对比,两种方法所得的土压力分布基本吻合,但是,改进水平层法所得的曲线呈现非线性变化趋势． |
| 关键词: 地震 土压力 水平层法 主应力偏转 |
| DOI：10.11918/j.issn.0367-6234.2014.02.016 |
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| 基金项目:国家自然科学基金与高速铁路基础研究联合基金资助项目(U1234204). |
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| Improved horizontal slice method for seismic active earth pressure of cohesionless soil |
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HUANG Rui, XIA Tangdai
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(MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, 310058 Hangzhou, China)
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| Abstract: |
| Based on pseudo-static theory, improved horizontal slice method is derived for retaining walls in translational mode to investigate the influence of principle stress deflection on the earth pressure. The method considers the principle stress deflection of soil behind walls and the horizontal shear force between slices. The basic equations are established according to stress state and static equilibrium condition, and solved by using iterative search algorithm to calculate the slip surface shape, seismic active earth pressure distribution, earth pressure coefficient and resultant force point, then parametric discussion is taken. Numerical results indicate that the slip surface shape for cohesionless soil is approximately linear, so it’s quite reasonable to use the hypothesis of planar slip surface in simplified calculation. In addition, soil friction angle and horizontal seismic action significantly impact earth pressure distribution, instead, the influence of wall friction angle and vertical seismic action are relatively smaller. Compared with the traditional pseudo-static method, earth pressure distributions by two different methods basically agree with each other, but the curve from the improved horizontal slice method trends towards nonlinear increase. |
| Key words: earthquake earth pressure horizontal slice method principle stress deflection |
